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Tönißen K, Franz GP, Albrecht E, Lutze P, Bochert R, Grunow B. Pikeperch muscle tissues: a comparative study of structure, enzymes, genes, and proteins in wild and farmed fish. FISH PHYSIOLOGY AND BIOCHEMISTRY 2024:10.1007/s10695-024-01354-1. [PMID: 38733450 DOI: 10.1007/s10695-024-01354-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 05/02/2024] [Indexed: 05/13/2024]
Abstract
Pikeperch (Sander lucioperca) is a freshwater species and an internationally highly demanded fish in aquaculture. Despite intensive research efforts on this species, fundamental knowledge of skeletal muscle biology and structural characteristics is missing. Therefore, we conducted a comprehensive analysis of skeletal muscle parameters in adult pikeperch from two different origins, wild-caught specimens from a lake and those reared in a recirculating aquaculture system. The analyses comprised the biochemical characteristics (nucleic acid, protein content), enzyme activities (creatine kinase, lactate dehydrogenase, NADP-dependent isocitrate dehydrogenase), muscle-specific gene and protein expression (related to myofibre formation, regeneration and permanent growth, muscle structure), and muscle fibre structure. The findings reveal distinct differences between the skeletal muscle of wild and farmed pikeperch. Specifically, nucleic acid content, enzyme activity, and protein expression varied significantly. The higher enzyme activity observed in wild pikeperch suggests greater metabolically activity in their muscles. Conversely, farmed pikeperch indicated a potential for pronounced muscle growth. As the data on pikeperch skeletal muscle characteristics is sparse, the purpose of our study is to gain fundamental insights into the characteristics of adult pikeperch muscle. The presented data serve as a foundation for further research on percids' muscle biology and have the potential to contribute to advancements and adaptations in aquaculture practices.
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Affiliation(s)
- Katrin Tönißen
- Fish Growth Physiology Workgroup, Research Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany.
| | - George P Franz
- Fish Growth Physiology Workgroup, Research Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - Elke Albrecht
- Working Group Muscle-Fat Crosstalk, Research Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - Philipp Lutze
- Fish Growth Physiology Workgroup, Research Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - Ralf Bochert
- Mecklenburg-Vorpommern Research Centre for Agriculture and Fisheries (LFA MV), Institute of Fisheries, Research Station Aquaculture, Born, Germany
| | - Bianka Grunow
- Fish Growth Physiology Workgroup, Research Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany.
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Kuhl H, Euclide PT, Klopp C, Cabau C, Zahm M, Roques C, Iampietro C, Kuchly C, Donnadieu C, Feron R, Parrinello H, Poncet C, Jaffrelo L, Confolent C, Wen M, Herpin A, Jouanno E, Bestin A, Haffray P, Morvezen R, de Almeida TR, Lecocq T, Schaerlinger B, Chardard D, Żarski D, Larson W, Postlethwait JH, Timirkhanov S, Kloas W, Wuertz S, Stöck M, Guiguen Y. Multi-genome comparisons reveal gain-and-loss evolution of the anti-Mullerian hormone receptor type 2 gene, an old master sex determining gene, in Percidae. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.13.566804. [PMID: 38014084 PMCID: PMC10680665 DOI: 10.1101/2023.11.13.566804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
The Percidae family comprises many fish species of major importance for aquaculture and fisheries. Based on three new chromosome-scale assemblies in Perca fluviatilis , Perca schrenkii and Sander vitreus along with additional percid fish reference genomes, we provide an evolutionary and comparative genomic analysis of their sex-determination systems. We explored the fate of a duplicated anti-Mullerian hormone receptor type-2 gene ( amhr2bY ), previously suggested to be the master sex determining (MSD) gene in P. flavescens . Phylogenetically related and structurally similar a mhr2 duplications ( amhr2b ) were found in P. schrenkii and Sander lucioperca , potentially dating this duplication event to their last common ancestor around 19-27 Mya. In P. fluviatilis and S. vitreus , this amhr2b duplicate has been lost while it was subject to amplification in S. lucioperca . Analyses of the amhr2b locus in P. schrenkii suggest that this duplication could be also male-specific as it is in P. flavescens . In P. fluviatilis , a relatively small (100 kb) non-recombinant sex-determining region (SDR) was characterized on chromosome-18 using population-genomics approaches. This SDR is characterized by many male-specific single-nucleotide variants (SNVs) and no large duplication/insertion event, suggesting that P. fluviatilis has a male heterogametic sex determination system (XX/XY), generated by allelic diversification. This SDR contains six annotated genes, including three ( c18h1orf198 , hsdl1 , tbc1d32 ) with higher expression in testis than ovary. Together, our results provide a new example of the highly dynamic sex chromosome turnover in teleosts and provide new genomic resources for Percidae, including sex-genotyping tools for all three known Perca species.
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Wuertz S, Orban A, Schaefer FJ, Overton JL, Krüger A. Carotenoids and retinoids in the gonad of brood-stock pikeperch: accumulation during vitellogenesis and influence on egg quality in farmed pikeperch Sander lucioperca. Anim Reprod 2023; 20:e20220103. [PMID: 37228385 PMCID: PMC10205056 DOI: 10.1590/1984-3143-ar2022-0103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 02/27/2023] [Indexed: 05/27/2023] Open
Abstract
Carotenoids are determinants of reproductive fitness and egg quality. Here we studied the accumulation of astaxanthin (AX), canthaxanthin (CA) zeaxanthin (ZX), lutein (LU), retinol (RX) and dehydroretinol (DR) during vitellogenesis comparing previtellogenic and vitellogenic pikeperch (Sander lucioperca) eggs (n = 5 each), as well as selected tissues (liver, fat and muscles) in first süawning females (1176-1450 g). Futhermore, we compared egg batches with high (88-99% hatching rate, n = 5) or low (40-67% hatching rate, n= 5) egg quality. Vitellogenic follicles revealed higher concentrations of DR, RX, ZX and LU compared to previtellogenic follicles. Neither CA nor AX was detectable. In parallel, DR and RX were mobilized in the liver. In adipose and muscle tissue, comparing previtellogenic and vitellogenic females, no significant differences in carotenoid/retinoid content were observed. In high quality egg batches, both DR and RX were increased. LU was lower in high quality than in low quality eggs. In a conclusion, the amount of retinoids seems suboptimal in low quality egg batches and increased DR and RX are desirable in pikeperch. Since hypervitaminosis of retinoids can be problematic though, supplementation of the food with carotenoids, which can serve as precursors for retinoids, has to be carried out carefully.
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Affiliation(s)
- Sven Wuertz
- Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
| | - Axel Orban
- Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
| | | | | | - Angela Krüger
- Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
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4
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Influence of diet changes on the condition and physiological state of juvenile sea trout ( Salmo trutta). ANNALS OF ANIMAL SCIENCE 2023. [DOI: 10.2478/aoas-2023-0016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Abstract
The aim of the study was to determine the influence of diets (factor D) and the time period (factor T) during which they were applied on the growth performance and physiological condition (blood plasma hematological and biochemical indicators of stress and immunity) in juvenile sea trout (Salmo trutta; initial body weight approximately 73 g). The diet of the fish that was used prior to the experiment (formulated feed; initial fish sample) was modified as follows: a different formulated feed (group B), mixed feed (feed B + prey fish; group B/N), prey fish exclusively (group N). The fish from group A were given the feed that was used prior to the beginning of the experiment. During the 28-day trial neither factors D nor T influenced absolute or relative fish growth rates. Factor D significantly influenced hematological indicators and leukograms, while the phagocytic index and cidal ability were determined by the time test (factor T). Myeloperoxidase (AMPO) was related significantly with the influence of factors D and T and also with the interaction of D×T. A significant decrease in AMPO was noted after two weeks of the test in groups B, N, and B/N, but after four weeks this indicator did not differ from that confirmed in the initial fish sample. The factors tested influenced stress indicators, i.e., cortisol (D and T) and glucose (D). Significant increases in cortisol (group B) and glucose (groups A, B, and B/N) concentrations were noted after two weeks of the test. After the subsequent two weeks (four weeks of the test) these indicators also stabilized. Sea trout from aquaculture readily accept prey fish; however, changes in diet cause stress reactions such as temporarily reduced immunity. Thus, the procedure for preparing sea trout stocking material for release, which is to change the feed from formulated to natural (live fish), should last approximately four weeks.
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Abdollahpour H, Falahatkar B, Van Der Kraak G. Effect of water temperature and food availability on growth performance, sex ratio and gonadal development in juvenile convict cichlid (Amatitlania nigrofasciata). J Therm Biol 2022; 107:103255. [DOI: 10.1016/j.jtherbio.2022.103255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 04/19/2022] [Accepted: 05/10/2022] [Indexed: 11/15/2022]
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Spawning Performance and Sex Steroid Levels in Female Pikeperch Sander lucioperca Treated with Poly(lactic-co-glycolic acid) Microparticles. Animals (Basel) 2022; 12:ani12020208. [PMID: 35049830 PMCID: PMC8773443 DOI: 10.3390/ani12020208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 01/09/2022] [Accepted: 01/13/2022] [Indexed: 11/17/2022] Open
Abstract
Simple Summary Pikeperch Sander lucioperca is a promising candidate for intensive aquaculture. However, controlled reproduction has become the major bottleneck in pikeperch production. To improve and optimize its artificial reproduction, an effective method for hormone treatment is needed. The use of a poly(lactic-co-glycolic acid) microparticle-sustained-release system to administer gonadotropin-releasing hormone agonist to pikeperch resulted in acceptable reproductive output. Our results establish the potential of poly(lactic-co-glycolic acid) microparticle as a novel tool for hormone treatment in fish. Abstract Pikeperch Sander lucioperca is a piscivorous species considered a promising candidate for the diversification of intensive aquaculture. This study aimed to determine the effect of a sustained-release delivery system incorporating mammalian gonadotropin-releasing hormone agonist (mGnRHa) into poly(lactic-co-glycolic acid) (PLGA) microparticles on the sex steroid levels and aspects of artificial reproduction of pikeperch. Fish were divided into four groups and injected with 20 µg mGnRHa/kg, 5-day release microparticles encapsulated with 5 µg GnRHa/kg BW (PLGA 5), 20 µg GnRHa/kg (PLGA 20), or 1 mL/kg 0.9% NaCl (control). Cumulative percentage ovulation was 100% in the PLGA 5 group, significantly higher than in other tested groups. No differences among groups were observed in latency or fecundity. The level of 11-ketotestosterone (11-KT) peaked at 40 h post-injection, and was sustained during ovulation, in all treated groups. The 17β-estradiol (E2) concentration increased in the mGnRHa-only group immediately after hormone injection, while both PLGA groups showed a reduction in E2 after injection, continuing to decrease until ovulation. A low dose of mGnRHa in PLGA microparticles significantly improves induction of ovulation and results in acceptable reproductive performance, which may positively affect pikeperch production under controlled conditions.
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Ljubobratović U, Fazekas G, Nagy Z, Kovács G, Tóth F, Dániel F, Żarski D. Fish with larger pre-seasonal oocytes yields lower egg quality in season – a case study of outdoor-cultured domesticated pikeperch (Sander lucioperca). Anim Reprod Sci 2022; 238:106936. [DOI: 10.1016/j.anireprosci.2022.106936] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 01/23/2022] [Accepted: 01/25/2022] [Indexed: 11/25/2022]
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Kim DJ, Lee CH, Lee YD. Reproductive Cycle of Blue-Striped Angelfish, Chaetodontoplus septentrionalis in Jeju Coastal Waters. Dev Reprod 2021; 25:145-155. [PMID: 34950818 PMCID: PMC8670773 DOI: 10.12717/dr.2021.25.3.145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/02/2021] [Accepted: 08/29/2021] [Indexed: 11/17/2022]
Abstract
Reproductive cycle of the blue-striped angelfish, Chaetodontoplus
septentrionalis were histologically investigated. Fish were monthly
collected in the coastal waters of Munseom, Seogwipo, Jeju-Island from February
to December 2018. The gonadosomatic index (GSI) increased from May and
maintained high values in August. The reproductive cycle of female fish can be
classified by the characteristics observed during gonadal development as
followed: growing stage (November to June), early mature stage (May to June),
mature and spawning stage (June to September), and degenerative and recovery
stage (September to December). In the male, testicular development period was
similar to that of ovarian development period, but mature and spawning period
was one month longer from June to October. Fecundity of mature female ranged
from 4,601 to 22,840 and was correlated positively with total length and body
weight. The histological analysis of gonadal development indicated that the
C. septentrionalis was summer-spawning type and is
considered a multiple spawner during spawning season.
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Affiliation(s)
- Dae-Jong Kim
- Marine Science Institute, Jeju National University, Jeju 63333, Korea
| | - Chi-Hoon Lee
- Marine Science Institute, Jeju National University, Jeju 63333, Korea.,Marine Science Institute, Jeju National University, Jeju 63333, Korea
| | - Young-Don Lee
- Marine Science Institute, Jeju National University, Jeju 63333, Korea
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9
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Nemova NN, Kantserova NP, Lysenko LA. The Traits of Protein Metabolism in
the Skeletal Muscle of Teleost Fish. J EVOL BIOCHEM PHYS+ 2021. [DOI: 10.1134/s0022093021030121] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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10
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Tenugu S, Pranoty A, Mamta SK, Senthilkumaran B. Development and organisation of gonadal steroidogenesis in bony fishes - A review. AQUACULTURE AND FISHERIES 2021. [DOI: 10.1016/j.aaf.2020.09.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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11
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Ljubobratović U, Kwiatkowski M, Tóth F, Demény F. Effects of hormonal treatment before water warming on synchronisation of spawning time, oocyte size, and egg quality in pikeperch (Sander lucioperca). Anim Reprod Sci 2021; 226:106712. [PMID: 33524727 DOI: 10.1016/j.anireprosci.2021.106712] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 01/21/2021] [Accepted: 01/22/2021] [Indexed: 11/25/2022]
Abstract
Inducing reproduction during periods of the year when spawning typically does not occur is an important goal for the feasibility of commercial fish farming. Pre-seasonal propagation of pikeperch generally occurs about 3 months before the natural spawning season. The objective of this study was to assess effects of imposing a thermal schedule for control of water temperature and differing salmon gonadotropin releasing hormone analogue (sGnRHa) dosages on final stages of oocyte growth, and egg quality by optimizing protocol duration and synchronizing spawning time. In Experiment 1, there was analysis of thermal schedule effects for water temperature control when hormonal administrations occurred before or after water warming (WARMING and STABLE, respectively). In Experiment 2, there was assessment of the sGnRHa dosage effects during the warming schedule. In both experiments there was analysis of oocyte diameter from time of sGnRHa administration until the late stages of maturation. There was greater synchrony in time of spawning in specimens of the WARMING group with lesser variability in time from sGnRHa administration to spawning. In Experiment 2, values for reproductive variables were variable among the different groups, without any differences between treatments. Oocyte diameter at the time of sGnRHa administration was correlated with embryo survival. For effective pre-seasonal pikeperch propagation, the selection of breeders based on oocyte diameter, and administration of 5 μg/kg sGnRHa immediately upon transport to hatchery, followed by a 1 °C/d temperature increase to 10 °C, are effective methods for induction of spawning during periods when spawning does not naturally occur.
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Affiliation(s)
- Uroš Ljubobratović
- Research Institute for Fisheries and Aquaculture (NAIK-HAKI), Anna-liget 35, 5540 Szarvas, Hungary.
| | - Maciej Kwiatkowski
- Research Institute for Fisheries and Aquaculture (NAIK-HAKI), Anna-liget 35, 5540 Szarvas, Hungary
| | - Flórian Tóth
- Research Institute for Fisheries and Aquaculture (NAIK-HAKI), Anna-liget 35, 5540 Szarvas, Hungary
| | - Ferenc Demény
- Research Institute for Fisheries and Aquaculture (NAIK-HAKI), Anna-liget 35, 5540 Szarvas, Hungary
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Lappalainen J, Vinni M, Malinen T. The Effects of Age-At-Maturation on the Parameters of a Biphasic Lester Growth Model in Sander lucioperca. ANN ZOOL FENN 2020. [DOI: 10.5735/086.058.0102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Jyrki Lappalainen
- Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, P.O. Box 65, FI-00014 University of Helsinki, Finland
| | - Mika Vinni
- Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, P.O. Box 65, FI-00014 University of Helsinki, Finland
| | - Tommi Malinen
- Lammi Biological Station, University of Helsinki, Pääjärventie 320, FI-16900 Lammi, Finland
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Rahman ML, Zahangir MM, Kitahashi T, Shahjahan M, Ando H. Effects of high and low temperature on expression of GnIH, GnIH receptor, GH and PRL genes in the male grass puffer during breeding season. Gen Comp Endocrinol 2019; 282:113200. [PMID: 31199926 DOI: 10.1016/j.ygcen.2019.06.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 05/29/2019] [Accepted: 06/10/2019] [Indexed: 01/19/2023]
Abstract
Gonadotropin-inhibitory hormone (GnIH) is a multifunctional hypophysiotropic neurohormone and has a stimulatory role in the control of reproduction in the grass puffer. To clarify the neuroendocrine mechanisms underlying the effect of changes in water temperature on reproduction in fish, we previously revealed that, in parallel to gonadal regression, both low and high temperature significantly decreased the expressions of the genes encoding kisspeptin (kiss2), kisspeptin receptor (kiss2r), gonadotropin-releasing hormone 1 (gnrh1) in the brain and gonadotropin (GTH) subunits (fshb and lhb) in the pituitary of sexually mature male grass puffer. In this study, we examined the changes in expression of gnih and GnIH receptor gene (gnihr) in the brain and pituitary along with the genes for growth hormone (gh) and prolactin (prl) in the pituitary of male grass puffer exposed to low temperature (14 °C), normal temperature (21 °C, as initial control) and high temperature (28 °C) conditions for 7 days. The levels of gnih and gnihr mRNAs were significantly decreased in both low and high temperature conditions compared to normal temperature in the brain and pituitary. Similarly, the gh mRNA levels were significantly decreased in both low and high temperature conditions. The prl mRNAs showed no significant changes at high temperature, whereas drastically decreased at low temperature possibly by dysfunctional cold stress. Taken together, the present results suggest that, in addition to the inhibitory effect of temperature changes on the Kiss2/GnRH1/GTH system, the suppression of GnIH/GH system may also be involved in the termination of reproduction by high temperature at the end of breeding season.
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Affiliation(s)
- Mohammad Lutfar Rahman
- Marine Biological Station, Sado Island Center for Ecological Sustainability, Niigata University, Sado, Niigata 952-2135, Japan; Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Md Mahiuddin Zahangir
- Marine Biological Station, Sado Island Center for Ecological Sustainability, Niigata University, Sado, Niigata 952-2135, Japan; Department of Fish Biology and Biotechnology, Chittagong Veterinary and Animal Sciences University, Chittagong 4225, Bangladesh
| | - Takashi Kitahashi
- Marine Biological Station, Sado Island Center for Ecological Sustainability, Niigata University, Sado, Niigata 952-2135, Japan
| | - Md Shahjahan
- Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Hironori Ando
- Marine Biological Station, Sado Island Center for Ecological Sustainability, Niigata University, Sado, Niigata 952-2135, Japan.
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Gonadal steroids and energy availability during ovarian maturation stages of the Amazonian pirarucu Arapaima gigas (Teleostei: Osteoglossidae) in the wild. Comp Biochem Physiol A Mol Integr Physiol 2019; 230:106-114. [DOI: 10.1016/j.cbpa.2019.01.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 12/18/2018] [Accepted: 01/03/2019] [Indexed: 11/24/2022]
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Evolutionary expression differences of creatine synthesis-related genes: Implications for skeletal muscle metabolism in fish. Sci Rep 2019; 9:5429. [PMID: 30931999 PMCID: PMC6443941 DOI: 10.1038/s41598-019-41907-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 03/19/2019] [Indexed: 01/16/2023] Open
Abstract
The creatine/phosphocreatine system is the principal energy buffer in mammals, but is scarcely documented in fish. We measured the gene expression of major enzymes of this system, glycine amidinotransferase (GATM), guanidinoacetate N-methyltransferase (GAMT) and muscle-type creatine kinase (CKM) in kidney, liver, and muscle tissues of fish and mammals. CKM was expressed strongly in the muscles of all examined species. In contrast, GATM and GAMT were strongly expressed in the muscle tissue of fish, but not of mammals. This indicates that creatine synthesis and usage are spatially separated in mammals, but not in fish, which is supported by RNA-Seq data of 25 species. Differences in amino acid metabolism along with methionine adenosyltransferase gene expression in muscle from fishes but not mammals further support a central metabolic role of muscle in fish, and hence different organization of the creatine/phosphocreatine biosynthesis system in higher and lower vertebrates.
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Gonçalves Junior LP, Mattioli CC, Martins EDFF, Silva WDSE, Ciolete TN, Vasconcellos ADS, Luz RK. Temperature-induced changes in reproductive variables in the teleost fish Lophiosilurus alexandri. J Therm Biol 2019; 80:133-140. [DOI: 10.1016/j.jtherbio.2019.01.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 11/27/2018] [Accepted: 01/07/2019] [Indexed: 01/13/2023]
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17
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Loganathan K, Moriya S, Parhar IS. High Melatonin Conditions by Constant Darkness and High Temperature Differently Affect Melatonin Receptormt1and TREK Channeltrek2ain the Brain of Zebrafish. Zebrafish 2018; 15:473-483. [DOI: 10.1089/zeb.2018.1594] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Kavinash Loganathan
- Brain Research Institute, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor, Malaysia
| | - Shogo Moriya
- Brain Research Institute, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor, Malaysia
| | - Ishwar S. Parhar
- Brain Research Institute, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor, Malaysia
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Rearing conditions and life history influence the progress of gametogenesis and reproduction performances in pikeperch males and females. Animal 2018; 12:2335-2346. [DOI: 10.1017/s1751731118000010] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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19
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Brüning A, Kloas W, Preuer T, Hölker F. Influence of artificially induced light pollution on the hormone system of two common fish species, perch and roach, in a rural habitat. CONSERVATION PHYSIOLOGY 2018; 6:coy016. [PMID: 29686874 PMCID: PMC5905364 DOI: 10.1093/conphys/coy016] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 02/23/2018] [Accepted: 03/24/2018] [Indexed: 05/22/2023]
Abstract
Almost all life on earth has adapted to natural cycles of light and dark by evolving circadian and circannual rhythms to synchronize behavioural and physiological processes with the environment. Artificial light at night (ALAN) is suspected to interfere with these rhythms. In this study we examined the influence of ALAN on nocturnal melatonin and sex steroid blood concentrations and mRNA expression of gonadotropins in the pituitary of European perch (Perca fluviatilis) and roach (Rutilus rutilus). In a rural experimental setting, fish were held in net cages in drainage channels experiencing either additional ALAN of ~15 lx at the water surface or natural light conditions at half-moon. No differences in melatonin concentrations between ALAN and natural conditions were detected. However, blood concentration of sex steroids (17β-estradiol; 11-ketotestosterone) as well as mRNA expression of gonadotropins (luteinizing hormone, follicle stimulating hormone) was reduced in both fish species. We conclude that ALAN can disturb biological rhythms in fish in urban waters. However, impacts on melatonin rhythm might have been blurred by individual differences, sampling methods and moonlight. The effect of ALAN on biomarkers of reproduction suggests a photo-labile period around the onset of gonadogenesis, including the experimental period (August). Light pollution therefore has a great potential to influence crucial life history traits with unpredictable outcome for fish population dynamics.
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Affiliation(s)
- Anika Brüning
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
- German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589 Berlin, Germany
- Corresponding author: Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589 Berlin, Germany. Tel: +49 (0)30184120.
| | - Werner Kloas
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
| | - Torsten Preuer
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
| | - Franz Hölker
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
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20
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Influence of batch-specific biochemical egg characteristics on embryogenesis and hatching success in farmed pikeperch. Animal 2017; 12:2327-2334. [PMID: 29198266 DOI: 10.1017/s1751731117003202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Low and variable egg quality remains a major issue in aquaculture impeding a reliable and continuous supply of larvae, particularly in emerging species, such as pikeperch, Sander lucioperca. We assessed the influence of batch-specific egg parameters (fatty acid (FA) profiles, cortisol content) on embryo life-stages until hatching (survival at 2, 24, 48, 72 h post fertilization (hpf), hatching rate) in an integrated study under commercial hatchery conditions (44 egg batches). Embryo mortality was elevated until 48 hpf (average 9.8% mortality between 2 and 48 hpf). Embryos surviving until 48 hpf were very likely (98.5%) to hatch successfully. The inherent egg FA composition was variable in-between batches. Total FA content ranged form 66.1 to 171.7 µg/mg (dry matter) total FA. Whereas specific FA ,18 : 0 and 20 : 5(n-3) (eicosapentaenoic acid) of the polar fraction and the ratio of 22 : 6(n-3) (docosahexaenoic acid) to 20 : 5(n-3) within the neutral fraction, were significantly correlated with early embryo development, contents of the respective FA did not differ between high (>90% hatching rate), mid (70% to 90% hatching rate) and low (<70% hatching rate) quality egg batches. Late embryo development and hatching were relatively independent of the FA profiles highlighting stage-dependent influences especially during early embryogenesis. Cortisol levels ranged from 22.7 to 293.2 ng/ml and did not directly explain for mortalities. However, high cortisol was associated with a lower content of specific FA, in particular highly unsaturated FA. These results demonstrate the magnitude of inter-individual differences in the batch-specific biochemical egg composition under stable hatchery conditions and suggest a stress-mediated lack of essential FA, which in turn affects early embryo survival. Surprisingly, embryos are able to cope well with a broad range of inherent egg parameters, which limits their predictive potential for egg quality in general. Still, specific FA profiles of high quality egg batches have potential for formulating species-specific broodstock diets and improving reproductive management in pikeperch.
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Güralp H, Pocherniaieva K, Blecha M, Policar T, Pšenička M, Saito T. Development, and effect of water temperature on development rate, of pikeperch Sander lucioperca embryos. Theriogenology 2017; 104:94-104. [PMID: 28822905 DOI: 10.1016/j.theriogenology.2017.07.050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 07/28/2017] [Accepted: 07/29/2017] [Indexed: 11/18/2022]
Abstract
Knowledge of embryo development is essential to the application of reproductive biotechnology in aquaculture, including for pikeperch Sander lucioperca. We describe pikeperch embryo development and demonstrated effects of temperature on the duration of embryogenesis. Developmental stages in embryos incubated at 15 °C were identified as zygote, 0-1.5 h post-fertilization (hpf); cleavage, 2.5-7.5 hpf; blastula, 9-18.75 hpf; gastrula, 21-39, hpf; segmentation, 45-105 hpf; and hatching, 125-197 hpf. Additional groups of eggs were fertilized and incubated at 10, 15, 20, and 25 °C to document stages of development, development rate, and survival. The optimal fertilization and incubation temperature was shown to be 15 °C, with the highest fertilization, survival, and hatching rates. Embryo development was slower at 10 °C, with 45% of fertilized embryos surviving to hatching. Development was accelerated at 20 °C, and resulted in a 56% survival rate of fertilized embryos. At 25 °C, embryos did not develop to the blastula stage. Pikeperch could be a valuable percid model for research in which flexible incubation temperatures is required.
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Affiliation(s)
- H Güralp
- University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic.
| | - K Pocherniaieva
- University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - M Blecha
- University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - T Policar
- University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - M Pšenička
- University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - T Saito
- University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic
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22
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Luo S, Jin S, Su L, Wang J. Effect of water temperature on reproductive performance and offspring quality of rare minnow, Gobiocypris rarus. J Therm Biol 2017; 67:59-66. [PMID: 28558938 DOI: 10.1016/j.jtherbio.2017.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 05/03/2017] [Accepted: 05/07/2017] [Indexed: 11/17/2022]
Abstract
Water temperature plays a significant role in the reproductive processes of temperate fishes. In the present study, the effects of water temperature on the reproductive performance and offspring quality of rare minnow (Gobiocypris rarus) were evaluated by cultured parent fish at different temperature (18~30℃) in a 2-month trial. The results revealed that rare minnows could spawn continuously within the range from 18℃ to 30℃, and these at 24℃ and 27℃ spawned every 3-4 days. Batch size of rare minnow increased with increasing water temperature, while egg production increased with increasing water temperature and then decreased at 30℃. High water temperature (30℃) had significantly adverse effects on fertilization rate and hatching rate (P<0.05). It was found that the oocyte growth at 18℃, 21℃, and 30℃ were slower than those at 24℃ and 27℃. Histologic analysis further showed that low temperature (18℃ and 21℃) slowed down vitellogenesis and oocyte maturation, while high temperature (30℃) had suppressive effects on oocyte maturation and ovulation. Based on present results, it was concluded that 24-27℃ was optimal breeding temperature for rare minnows and water temperature higher than 30℃ resulting from climate change would pose a threat to its wild populations.
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Affiliation(s)
- Si Luo
- The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institution of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China; Power China Guiyang Engineering Corporation Limited, Guiyang, Guizhou 550081, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shiyu Jin
- The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institution of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, the Chinese Academy of Sciences, Wuhan, Hubei 430072, China
| | - Liangxia Su
- The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institution of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianwei Wang
- The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institution of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072, China.
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23
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Shahjahan M, Kitahashi T, Ando H. Temperature affects sexual maturation through the control of kisspeptin, kisspeptin receptor, GnRH and GTH subunit gene expression in the grass puffer during the spawning season. Gen Comp Endocrinol 2017; 243:138-145. [PMID: 27916574 DOI: 10.1016/j.ygcen.2016.11.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 11/25/2016] [Accepted: 11/30/2016] [Indexed: 01/31/2023]
Abstract
Water temperature is an environmental factor of primary importance that influences reproductive function in fish. To understand the molecular and physiological mechanisms underlying the regulation of reproduction by temperature, we examined changes in expression of genes encoding kisspeptin (kiss2), kisspeptin receptor (kiss2r) and three gonadotropin-releasing hormones (gnrh1, gnrh2 and gnrh3) in the brain and genes encoding gonadotropin (GTH) subunits (gpa, fshb and lhb) in the pituitary of grass puffer exposed to a low temperature (14°C), normal temperature (21°C) and high temperature (28°C) for 7days. In addition, the plasma levels of cortisol were examined after exposed to three temperature conditions. The gonadosomatic index was significantly decreased in both low and high temperature conditions. The levels of kiss2 and kiss2r mRNAs were significantly decreased at both low and high temperature conditions compared to normal temperature (control) condition. gnrh1 but not gnrh2 were significantly decreased in both temperature conditions, while gnrh3 showed a decreasing tendency in low temperature. Consequently, the levels of fshb and lhb mRNAs were significantly decreased in both low and high temperature conditions. Interestingly, the plasma levels of cortisol were significantly increased in low temperature but remain unchanged in high temperature, suggesting that the fish were under stress in the low temperature conditions but not in the high temperature conditions. Taken together, the present results indicate that anomalous temperature have an inhibitory effect on reproductive function through suppressing kiss2/kiss2r/gnrh1/fshb and lhb expression and these changes may occur in a normal physiological response as well as in a malfunctional stress response.
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Affiliation(s)
- Md Shahjahan
- Sado Marine Biological Station, Faculty of Science, Niigata University, Sado, Niigata 952-2135, Japan
| | - Takashi Kitahashi
- Sado Marine Biological Station, Faculty of Science, Niigata University, Sado, Niigata 952-2135, Japan
| | - Hironori Ando
- Sado Marine Biological Station, Faculty of Science, Niigata University, Sado, Niigata 952-2135, Japan.
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24
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Schaefer FJ, Hermelink B, Husmann P, Meeus W, Adriaen J, Wuertz S. Induction of gonadal maturation at different temperatures in burbot Lota lota. JOURNAL OF FISH BIOLOGY 2016; 89:2268-2281. [PMID: 27650588 DOI: 10.1111/jfb.13107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 07/06/2016] [Indexed: 06/06/2023]
Abstract
A rearing experiment was conducted to test whether temperature protocols that differed from a simulation of natural conditions might induce maturation after isothermal grow-out in burbot Lota lota. Lota lota were acclimated to two different temperature regimes: low temperature (LT), close to natural temperature at 4·0° C and elevated, high temperature (HT) at 8·5° C over 40 and 27 days respectively, with all fish then wintered for 47 days. Every second fish was treated with a gonadotropin-releasing hormone analogue. Maturational competence of oocytes was assessed with a germinal vesicle breakdown assay using a novel staining strategy. In both treatments, puberty and maturational progress occurred, characterised by an elevated gonado-somatic index and advanced gonadal stages (histological analysis). Progress of gonadal maturation was reflected by elevated plasma concentrations of testosterone and 11-ketosterone in males and 17β-oestradiol in females. Ovulation was not observed. Sperm could be activated equally across treatments. In general, LT was more effective than HT treatment, indicated by advanced gonadal stages, higher numbers of oocytes undergoing germinal vesicle breakdown in vitro and elevated sex steroid levels. Hormone treatment could improve effectiveness at HT. In conclusion, less drastic temperature regimes as previously reported in combination with hormone treatments seem sufficient to induce maturation in L. lota after isothermal grow-out.
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Affiliation(s)
- F J Schaefer
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Dept. Ecophysiology and Aquaculture, Müggelseedamm 310, 12587, Berlin, Germany
- Humboldt-Universität zu Berlin, Faculty of Life Sciences, Thaer Institute of Agricultural and Horticultural Sciences, Invalidenstraße 42, 10099, Berlin, Germany
| | - B Hermelink
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Dept. Ecophysiology and Aquaculture, Müggelseedamm 310, 12587, Berlin, Germany
| | - P Husmann
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Dept. Ecophysiology and Aquaculture, Müggelseedamm 310, 12587, Berlin, Germany
- Freie Universität Berlin, Department of Biology, Chemistry and Pharmacy, Takustraße 3, 14195, Berlin, Germany
| | - W Meeus
- Aqua-ERF, Odisee University College, Hospitaalstraat 23, 9100, Sint-Niklaas, Belgium
| | - J Adriaen
- Aqua-ERF, Odisee University College, Hospitaalstraat 23, 9100, Sint-Niklaas, Belgium
| | - S Wuertz
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Dept. Ecophysiology and Aquaculture, Müggelseedamm 310, 12587, Berlin, Germany.
- Humboldt-Universität zu Berlin, Faculty of Life Sciences, Thaer Institute of Agricultural and Horticultural Sciences, Invalidenstraße 42, 10099, Berlin, Germany.
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25
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Brüning A, Hölker F, Franke S, Kleiner W, Kloas W. Impact of different colours of artificial light at night on melatonin rhythm and gene expression of gonadotropins in European perch. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 543:214-222. [PMID: 26584071 DOI: 10.1016/j.scitotenv.2015.11.023] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 11/04/2015] [Accepted: 11/04/2015] [Indexed: 05/10/2023]
Abstract
The distribution and intensity of artificial light at night, commonly referred to as light pollution, is consequently rising and progressively also ecological implications come to light. Low intensity light is known to suppress nocturnal melatonin production in several fish species. This study aims to examine the least suppressive light colour for melatonin excreted into the holding water and the influence of different light qualities and quantities in the night on gene expression of gonadotropins in fish. European perch (Perca fluviatilis) were exposed to light of different wavelengths during the night (blue, green, and red). Melatonin concentrations were measured from water samples every 3h during a 24h period. Gene expression of gonadotropins was measured in perch exposed to different light colours and was additionally examined for perch subjected to different intensities of white light (0 lx, 1 lx, 10 lx, 100 lx) during the night. All different light colours caused a significant drop of melatonin concentration; however, blue light was least suppressive. Gene expression of gonadotropins was not influenced by nocturnal light of different light colours, but in female perch gonadotropin expression was significantly reduced by white light already at the lowest level (1 lx). We conclude that artificial light with shorter wavelengths at night is less effective in disturbing biological rhythms of perch than longer wavelengths, coinciding with the light situation in freshwater habitats inhabited by perch. Different light colours in the night showed no significant effect on gonadotropin expression, but white light in the night can disturb reproductive traits already at very low light intensities. These findings indicate that light pollution has not only the potential to disturb the melatonin cycle but also the reproductive rhythm and may therefore have implications on whole species communities.
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Affiliation(s)
- Anika Brüning
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany.
| | - Franz Hölker
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany.
| | - Steffen Franke
- Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany.
| | - Wibke Kleiner
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany.
| | - Werner Kloas
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany.
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26
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Im J, Kong D, Ghil S. Effects of Water Temperature on Gonad Development in the Cold-Water Fish, Kumgang Fat Minnow Rhynchocypris kumgangensis. CYTOLOGIA 2016. [DOI: 10.1508/cytologia.81.311] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Jisu Im
- Department of Life Science, Kyonggi University
| | | | - Sungho Ghil
- Department of Life Science, Kyonggi University
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27
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Palstra AP, Blok MC, Kals J, Blom E, Tuinhof-Koelma N, Dirks RP, Forlenza M, Blonk RJW. In- and outdoor reproduction of first generation common sole Solea solea under a natural photothermal regime: Temporal progression of sexual maturation assessed by monitoring plasma steroids and gonadotropin mRNA expression. Gen Comp Endocrinol 2015; 221:183-92. [PMID: 25583580 DOI: 10.1016/j.ygcen.2014.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 12/01/2014] [Accepted: 12/12/2014] [Indexed: 11/22/2022]
Abstract
Reproduction of many temperate fishes is seasonal and maturation and spawning of gametes are under photothermal control. Reproductive success of first generation (G1) common sole Solea solea in captivity has been low. In this study, the sexual maturation status has been assessed during the prespawning months in G1 sole that were housed (a) outdoor under the natural photoperiod and temperature, or (b) indoor under artificial photothermal induction. Maturation was assessed in male and female G1 broodstock in November as controls, after which the remaining population was divided over two outdoor flow-through tanks placed in a pond and two indoor recirculating aquaculture system (RAS) tanks. Subsequently, maturation status (gonadosomatic index GSI and plasma levels of testosterone T and 17β-estradiol E2) was assessed in one tank for each condition in January, February and during spawning in early April, while fish in the other tank were not disturbed in achieving reproductive success. Quantitative real-time PCR was performed to determine species-specific gonadotropin mRNA expression in females. Successful G1 spawning and egg fertilisation occurred in all experimental tanks. Gonadal development was similar under both conditions. Higher E2 and T levels were found in indoor housed females. Gonadotropin expression revealed similar profiles between outdoor and indoor housed females. G1 sole could be reproduced in the outdoor tanks under the natural photoperiod and in the indoor tanks under artificial simulation of this regime that includes a potentially crucial chilling period of 2-3 months at 5-7 °C.
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Affiliation(s)
- A P Palstra
- Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen Aquaculture, Wageningen University and Research Centre, Korringaweg 5, 4401 NT Yerseke, The Netherlands(1).
| | - M C Blok
- Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen Aquaculture, Wageningen University and Research Centre, Korringaweg 5, 4401 NT Yerseke, The Netherlands(1)
| | - J Kals
- Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen Aquaculture, Wageningen University and Research Centre, Korringaweg 5, 4401 NT Yerseke, The Netherlands(1)
| | - E Blom
- Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen Aquaculture, Wageningen University and Research Centre, Korringaweg 5, 4401 NT Yerseke, The Netherlands(1)
| | | | - R P Dirks
- NewCatch BV, J.H. Oortweg 19, 2333 CH Leiden, The Netherlands
| | - M Forlenza
- Cell Biology and Immunology Group, Wageningen University, De Elst 1, 6708 WD Wageningen, The Netherlands
| | - R J W Blonk
- Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen Aquaculture, Wageningen University and Research Centre, Korringaweg 5, 4401 NT Yerseke, The Netherlands(1)
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28
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Ben Ammar I, Teletchea F, Milla S, Ndiaye WN, Ledoré Y, Missaoui H, Fontaine P. Continuous lighting inhibits the onset of reproductive cycle in pikeperch males and females. FISH PHYSIOLOGY AND BIOCHEMISTRY 2015; 41:345-356. [PMID: 25233876 DOI: 10.1007/s10695-014-9987-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 09/07/2014] [Indexed: 06/03/2023]
Abstract
The effect of a constant photoperiod on the inhibition of male and female reproductive cycles was studied in pikeperch Sander lucioperca. Over a 153-day period, batches of pikeperch (2 years, 950 g) breeders were kept under either under natural or artificial photoperiod conditions (24L:0D) (30-35 fish/tank, triplicate) and sampled in late June (start of the photoperiod decrease in natural conditions), late August (start of temperature decrease) and late November (exogenous vitellogenesis) (7-10 fish/tank/sampling date). Morphological parameters, sexual steroids, alkaline-labile phosphate (µg/mL) levels and gamete developmental stages were investigated. Gonado-somatic index (%), developmental stages and sexual steroid levels (17β-estradiol, testosterone and 11-ketotestosterone, ng/mL) in both sexes and oocyte diameter (µm) and plasma alkaline-labile phosphate (µg/mL) in females were lower in response to a continuous lighting (24L:0D). In both sexes, continuous lighting applied in June for 153 days totally inhibited or delayed the onset of the reproductive cycle. In conclusion, photoperiod manipulation can be used to delay the pikeperch reproductive cycle, even if temperature decreases. This is the first report of the inhibitory effect of photoperiod on the onset of the reproductive cycle in pikeperch.
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Affiliation(s)
- I Ben Ammar
- Unité de Recherche Animal et Fonctionnalités des Produits Animaux, USC INRA 340, Université de Lorraine, 54505, Vandœuvre-lès-Nancy, France,
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29
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Li GL, Zhang MZ, Deng SP, Chen HP, Zhu CH. Effects of temperature and fish oil supplementation on ovarian development and foxl2 mRNA expression in spotted scat Scatophagus argus. JOURNAL OF FISH BIOLOGY 2015; 86:248-260. [PMID: 25425050 DOI: 10.1111/jfb.12578] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 10/02/2014] [Indexed: 06/04/2023]
Abstract
In this study, the complete foxl2 complementary (c)DNA sequence was isolated by simple modular-architecture research tool (SMART)er rapid amplification of cDNA ends (RACE). Two year-old female spotted scat, Scatophagus argus, were reared at different temperatures (23, 26 and 29° C) for 6 weeks, or fed with different concentrations of dietary fish oil (0, 2 or 6%) for 8 weeks. Ovarian development, serum oestradiol-17β (E2 ) levels, as well as ovarian foxl2 expression were measured. At the end of experiment, ovarian foxl2 messenger (m)RNA expression in fish reared at 23 and 26° C was significantly higher than that in fish reared at 29° C, and that in 2 and 6% fish oil groups was also significantly higher than that in control group (P < 0·05). Serum E2 levels exhibited the same trend with foxl2 mRNA expression in temperature treatment groups and fish oil fed groups. There was a significant positive correlation between stage of oocytes and foxl2 expressions. Results showed that from 23 to 29° C, the optimal temperature for ovarian development in S. argus was 23-26° C, and 6% fish oil supplementation could effectively promote ovarian development. Optimal temperature and fish oil supplement might increase ovarian foxl2 mRNA expressions to promote ovarian development in S. argus.
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Affiliation(s)
- G-L Li
- Fisheries College, Guangdong Ocean University, Zhanjiang, 524088, China; Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, Guangdong Ocean University, Zhanjiang, 524088, China
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30
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Urbatzka R, Lorenz C, Wiedemann C, Lutz I, Kloas W. Steroid exposure during larval development of Xenopus laevis affects mRNA expression of the reproductive pituitary-gonadal axis in a sex- and stage-dependent manner. Comp Biochem Physiol C Toxicol Pharmacol 2014; 160:1-8. [PMID: 24239592 DOI: 10.1016/j.cbpc.2013.11.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 10/30/2013] [Accepted: 11/06/2013] [Indexed: 01/28/2023]
Abstract
Steroids are known to influence the reproductive pituitary-gonadal axis in adult amphibians. Here, we studied the effects of hormones on pituitary and gonadal mRNA expression during the development of Xenopus laevis. Tadpoles at NF 58 (prometamorphosis) and at NF 66 (freshly metamorphosed) were exposed for three days to 17β-estradiol (E2), tamoxifen (TAM), testosterone (T), dihydrotestosterone (DHT) at 10(-7)M, and flutamide (FLU) at 10(-6)M. In both genders at NF 58 and 66, T and DHT decreased luteinizing hormone beta (lhβ), but increased follicle stimulating hormone beta (fshβ), while FLU induced lhβ specifically in males. In the testis steroidogenic genes (p450 side chain cleavage enzyme, p450scc; steroid acute regulatory protein, star) at NF 58 showed a similar pattern as for lhβ, while the response at NF 66 was only partially present. In females, TAM induced lhβ at NF 58, while E2 decreased lhβ and increased fshβ at NF 66. In the ovaries, no alterations were observed for the steroidogenic genes. Summarizing, gonadotropic and steroidogenic mRNA expression may indicate control of androgen level during testis differentiation in male tadpoles at NF 58. In females the non-responsiveness of steroidogenic genes could be a sign of gonadal quiescence during pre-pubertal stages.
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Affiliation(s)
- Ralph Urbatzka
- CIIMAR, Centre of Marine and Environmental Research, Laboratory of Ecotoxicology, Genomics and Evolution, Rua dos Bragas 289, 4050-123 Porto, Portugal.
| | - Claudia Lorenz
- Department of Ecophysiology and Aquaculture, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
| | - Caterina Wiedemann
- Reproduction Biology, Leibniz-Institute for Zoo and Wildlife Research, PF 601103, 10252 Berlin, Germany
| | - Ilka Lutz
- Department of Ecophysiology and Aquaculture, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
| | - Werner Kloas
- Department of Ecophysiology and Aquaculture, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany; Department of Endocrinology, Institute of Biology, Humboldt-University, Berlin, Germany
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Miranda LA, Chalde T, Elisio M, Strüssmann CA. Effects of global warming on fish reproductive endocrine axis, with special emphasis in pejerrey Odontesthes bonariensis. Gen Comp Endocrinol 2013; 192:45-54. [PMID: 23500677 DOI: 10.1016/j.ygcen.2013.02.034] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 02/21/2013] [Accepted: 02/23/2013] [Indexed: 12/29/2022]
Abstract
The ongoing of global warming trend has led to an increase in temperature of several water bodies. Reproduction in fish, compared with other physiological processes, only occurs in a bounded temperature range; therefore, small changes in water temperature could significantly affect this process. This review provides evidence that fish reproduction may be directly affected by further global warming and that abnormal high water temperature impairs the expression of important genes throughout the brain-pituitary-gonad axis. In all fishes studied, gonads seem to be the organ more readily damaged by heat treatments through the inhibition of the gene expression and subsequent synthesis of different gonadal steroidogenic enzymes. In view of the feedback role of sex steroids upon the synthesis and release of GnRH and GtHs in fish, it is possible that the inhibition observed at brain and pituitary levels in treated fish is consequence of the sharp decrease in plasma steroids levels. Results of in vitro studies on the inhibition of pejerrey gonad aromatase expression by high temperature corroborate that ovary functions are directly disrupted by high temperature independently of the brain-pituitary axis. For the reproductive responses obtained in laboratory fish studies, it is plausible to predict changes in the timing and magnitude of reproductive activity or even the total failure of spawning season may occur in warm years, reducing annual reproductive output and affecting future populations.
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Affiliation(s)
- Leandro Andrés Miranda
- Laboratorio de Ictiofisiología y Acuicultura, Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (CONICET-UNSAM), Av. Intendente Marino, km. 8.2, (B7130IWA) Chascomús, Buenos Aires, Argentina.
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Sarameh SP, Falahatkar B, Takami GA, Efatpanah I. Physiological changes in male and female pikeperch Sander lucioperca (Linnaeus, 1758) subjected to different photoperiods and handling stress during the reproductive season. FISH PHYSIOLOGY AND BIOCHEMISTRY 2013; 39:1253-1266. [PMID: 23504101 DOI: 10.1007/s10695-013-9780-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 02/25/2013] [Indexed: 06/01/2023]
Abstract
Pikeperch broodstocks were exposed to different photoperiods: constant light (24L:0D), constant darkness (0L:24D), and 12 h light, 12 h darkness (12L:12D), for 40 days. Half of the broodstocks of each photoperiod were exposed to handling stress at a specific time of the day. Results showed that cortisol and lactate did not reveal any significant difference. However, glucose levels in females increased in the stress-free darkness period in comparison with stressful darkness photoperiods (0L:24D-s). Red blood cells in males and white blood cells in females showed a significant difference under different photoperiod regimes. Both sexes showed no significant difference in the differential count of leukocytes under different photoperiods and handling stress. Constant photoperiods and handling stress affected the hematological parameters, particularly, the number of lymphocytes and neutrophils in females. Our findings revealed that due to a long-term exposure to stressors, pikeperch brooders become adapted to stressful conditions.
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Affiliation(s)
- Sara Pourhosein Sarameh
- Department of Fisheries, Faculty of Natural Resources, Islamic Azad University, Lahijan Branch, Lahijan, Guilan, Iran
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Kohn YY, Symonds JE, Lokman PM. The effects of 11-ketotestosterone on ovarian physiology of previtellogenic captive hapuku (Polyprion oxygeneios). Comp Biochem Physiol A Mol Integr Physiol 2013; 166:496-502. [PMID: 23948118 DOI: 10.1016/j.cbpa.2013.07.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 07/31/2013] [Accepted: 07/31/2013] [Indexed: 11/26/2022]
Abstract
The present study investigated, for the first time in a perciform teleost, the effects of in vivo 11-ketotestosterone (11-KT) treatment using slow-release implants on ovarian development and gonadotropin receptor mRNA levels in captive previtellogenic females of hapuku (Polyprion oxygeneios). At the cellular/functional level, ovarian development and ovarian and hepatic total lipid levels were examined. At the molecular level, transcript abundance of ovarian follicle-stimulating hormone receptor (FSH-R) and luteinizing hormone receptor (LH-R) was measured. Additionally, cyclic adenosine monophosphate (cAMP) levels in ovarian fragments from placebo and 11-KT implanted fish incubated with or without human chorionic gonadotropin (hCG) in vitro were compared between groups. There were no significant differences between treatments with regard to oocyte size and lipid contents of liver and ovary. Messenger RNA levels of FSH-R and LH-R were significantly lower in the treated females. Similarly, cAMP levels were significantly lower in the ovarian fragments of the 11-KT implanted females. These results suggest that 11-KT specifically, but possibly androgens in general, may not have an important function in regulating gonadal development of previtellogenic female hapuku; indeed, if anything, 11-KT appeared to have a detrimental effect and its use will not be beneficial in advancing sexual maturity of hapuku in aquaculture.
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Affiliation(s)
- Yair Y Kohn
- University of Otago, Department of Zoology, 340 Great King St., Dunedin 9016, New Zealand; NIWA, Bream Bay Aquaculture Park, PO Box 147, Ruakaka 0151, New Zealand.
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Wuertz S, Schulze SGE, Eberhardt U, Schulz C, Schroeder JP. Acute and chronic nitrite toxicity in juvenile pike-perch (Sander lucioperca) and its compensation by chloride. Comp Biochem Physiol C Toxicol Pharmacol 2013; 157:352-60. [PMID: 23318298 DOI: 10.1016/j.cbpc.2013.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 01/02/2013] [Accepted: 01/08/2013] [Indexed: 10/27/2022]
Abstract
Pike-perch Sander lucioperca is currently considered as one of the most promising candidates for production in freshwater recirculation aquaculture systems (RAS). Here, due to the lack of studies on nitrite (NO(2)(-)) toxicity in pike-perch, a flow-through exposure at 0, 0.44, 0.88, 1.75, 3.5, 7, 14 and 28 mg/L NO(2)(-)-N was carried out to determine the acute and chronic toxicity over a period of 32 days. In juvenile pike-perch, 120 h LC(50) was 6.1mg/L NO(2)(-)-N and at ≥14 mg/L NO(2)(-)-N all fish had died within 24 h. Chronic exposure revealed a significant build up of NO(2)(-) in the plasma as well as in the muscles at ≥0.44 mg/L NO(2)(-)-N peaking in fish exposed to the highest concentration of 3.5 mg/L NO(2)(-)-N after 32 days. Still, due to high individual variation methemoglobin (MetHb) was only significantly increased (p<0.01) at 3.5 mg/L NO(2)(-)-N. No adverse effects on red blood cells (RBC) and hematocrit were observed in any of the treatments. In a second experiment, compensation of NO(2)(-) toxicity at increasing chloride concentrations (40 (freshwater), 65, 90, 140, 240, 440 mg/L Cl(-)) was observed at a constant exposure of 10 mg/L NO(2)(-)-N for 42 days. At ≥240 mg/L Cl(-), NO(2)(-) build-up in blood plasma and muscle was completely inhibited. At lower Cl(-) concentrations (≤140 mg/L), NO(2)(-) was significantly increased in plasma, but only insignificantly elevated in muscle due to high individual variation. MetHb was increased significantly difference only at 40 mg/L Cl(-) (freshwater control) compared to the control. Again, high individual variations were observed. As a conclusion, S. lucioperca is moderately sensitive towards NO(2)(-) and acceptable levels in RAS should hence not exceed 1.75 mg/L NO(2)(-)-N to avoid MetHb formation. However, based on the 120 h LC(50) and a factor of 0.01 according to Sprague (1971), a NO(2)(-) concentration of ≤0.061 mg/L NO(2)(-)-N is considered as "safe." Thereby, no NO(2)(-) should accumulate in the plasma or muscle tissue during chronic exposure. For 10 mg/L NO(2)(-)-N, ≥240 mg/L chloride compensates for NO(2)(-) uptake in plasma and muscle.
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Affiliation(s)
- S Wuertz
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany.
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Oyster sex determination is influenced by temperature - first clues in spat during first gonadic differentiation and gametogenesis. Comp Biochem Physiol A Mol Integr Physiol 2013; 165:61-9. [PMID: 23416889 DOI: 10.1016/j.cbpa.2013.02.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 02/05/2013] [Accepted: 02/09/2013] [Indexed: 11/24/2022]
Abstract
The sex-determining system of Crassostrea gigas is still poorly known, especially regarding the potential influence of temperature. In order to address this question, mRNA expressions of actors of the molecular cascade (Cg-DMl, Cg-SoxE, Cg-β-catenin, Cg-Foxl2/Cg-Foxl2os) and of Oyvlg, a germ cell marker, were investigated by real-time PCR in spat grown at different temperatures (18, 22, 25 and 28°C). In parallel, gonadic differentiation, gametogenesis and sex ratios were assessed by histology at each of these temperatures. Whatever the temperature, Cg-DMl, Cg-SoxE, Cg-β-catenin and Oyvlg expressions peaked at the same developmental stage, always after Cg-Foxl2/Cg-Foxl2os (around 40-44dpf for spat grown at 18°C). Temperatures increased the kinetics of first gonadic differentiation and gametogenesis. At 25°C a significant switch occurred in sex ratio towards males and in the balance of expression between male and female genes, in favor of males. A slight gametogenesis disturbance was also observed. These results strengthen the hypotheses about the sex-determining time window and molecular cascade governing the development of C. gigas, with notably the involvement of Cg-Foxl2/Cg-Foxl2os in the very early steps. They also suggest an influence of temperature on the oyster's sex determination which, associated to genetic control, would induce a mixed sex determination system (GSD+TSD).
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Fonseca APD, Volcan MV, Sampaio LA, Romano LA, Robaldo RB. Growth of Critically Endangered annual fish Austrolebias wolterstorffi (Cyprinodontiformes: Rivulidae) at different temperatures. NEOTROPICAL ICHTHYOLOGY 2013. [DOI: 10.1590/s1679-62252013000400012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Given the importance of knowledge of the biology of endangered species for the planning of conservation and management efforts, the aim of this study was to investigate the influence of temperature on the growth of Austrolebias wolterstorffi (Ahl, 1924). To clarify the thermal influence on the growth of the species, temperatures of 16, 20, 24 , and 28°C were tested in triplicate. The present study showed that a water temperature of 28°C is detrimental to the growth of the species. Among the other tested temperatures, it was found that the optimum temperature for growth decreases as an individual ages and is slightly lower for females. It was demonstrated here that males reach a higher weight and length, and grow faster than females, reaching sexual maturity earlier. To optimize the growth of this species in captivity, the ideal temperature of the water during the initial life period is 24°C, until after puberty when the temperature should decrease to about 21°C.
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Trubiroha A, Kroupova H, Wuertz S, Kloas W. Up-regulation of gonadotropin mRNA-expression at the onset of gametogenesis in the roach (Rutilus rutilus): evidence for an important role of brain-type aromatase (cyp19a1b) in the pituitary. Gen Comp Endocrinol 2012; 178:529-38. [PMID: 22814335 DOI: 10.1016/j.ygcen.2012.07.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 07/04/2012] [Accepted: 07/06/2012] [Indexed: 01/12/2023]
Abstract
The present study characterized changes in key parameters of reproduction in adult roach (Rutilus rutilus) from Lake Grosser Mueggelsee (Berlin, Germany) during natural gametogenesis. Fish of both sexes were sampled in monthly intervals between April and August in order to cover the onset of gametogenesis. Investigated parameters included gonad histology, plasma levels of 17β-oestradiol (E2), testosterone (T), 11-ketotestosterone (11-KT), and 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) as well as the expression of gonadotropin subunits in the pituitary. Furthermore, the mRNA-expression of brain-type aromatase (cyp19a1b), androgen receptor (ar), and estrogen receptor isoforms was studied at the pituitary level. The onset of gametogenesis - as indicated by follicles with cortical alveoli in females and first spermatogonia B in males - was observed in July, accompanied by a significant up-regulation of follicle-stimulating hormone β (fshβ) mRNA in the pituitary in both sexes. On the other hand, luteinizing hormone β (lhβ) mRNA increased later on in August. In males, the increase of fshβ mRNA in July coincided with a rise in plasma 11-KT concentrations. In females, E2 in plasma increased later, not until August, shortly before true vitellogenesis (late cortical alveoli stage). Expression of sex steroid receptors in the pituitary revealed only minor seasonal fluctuations. Most pronounced, ar mRNA displayed the highest level pre-spawning in both sexes. Interestingly, cyp19a1b mRNA-expression in the pituitary increased in parallel with fshβ already before any changes in plasma E2 or T occurred. These data suggest an important role of pituitary FSH and aromatase at the onset of gametogenesis in the roach.
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Affiliation(s)
- Achim Trubiroha
- Department of Ecophysiology and Aquaculture, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Mueggelseedamm 310, D-12587 Berlin, Germany.
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Elisio M, Chalde T, Miranda LA. Effects of short periods of warm water fluctuations on reproductive endocrine axis of the pejerrey (Odontesthes bonariensis) spawning. Comp Biochem Physiol A Mol Integr Physiol 2012; 163:47-55. [DOI: 10.1016/j.cbpa.2012.05.178] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 05/03/2012] [Accepted: 05/04/2012] [Indexed: 11/29/2022]
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