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Carneiro MDD, García-Mesa S, Sampaio LA, Planas M. Implications of Salinity and Acidic Environments on Fitness and Oxidative Stress Parameters in Early Developing Seahorses Hippocampus reidi. Animals (Basel) 2022; 12:ani12223227. [PMID: 36428453 PMCID: PMC9686857 DOI: 10.3390/ani12223227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/15/2022] [Accepted: 11/17/2022] [Indexed: 11/23/2022] Open
Abstract
Water acidification affects aquatic species, both in natural environmental conditions and in ex situ rearing production systems. The chronic effects of acidic conditions (pH 6.5 vs. pH 8.0) in seahorses (Hippocampus spp.) are not well known, especially when coupled with salinity interaction. This study investigated the implications of pH on the growth and oxidative stress in the seahorse Hippocampus reidi (Ginsburg, 1933), one of the most important seahorse species in the ornamental trade. Two trials were carried out in juveniles (0-21 and 21-50 DAR-days after the male's pouch release) reared under acid (6.5) and control (8.0) pH, both in brackish water (BW-salinity 11) and seawater (SW-salinity 33). In the first trial (0-21 DAR), there was no effect of pH on the growth of seahorses reared in SW, but the survival rate was higher for juveniles raised in SW at pH 6.5. However, the growth and survival of juveniles reared in BW were impaired at pH 6.5. Compared to SW conditions, the levels of superoxide dismutase and DT-diaphorase, as well as the oxidative stress index, increased for juveniles reared in BW. In the second trial, seahorse juveniles were reared in SW at pH 8.0, and subsequently kept for four weeks (from 21 to 50 DAR) at pH 6.5 and 8.0. The final survival rates and condition index were similar in both treatments. However, the growth under acidic conditions was higher than at pH 8.0. In conclusion, this study highlights that survival, growth, and oxidative status condition was enhanced in seahorse juveniles reared in SW under acidic conditions (pH = 6.5). The concurrent conditions of acidic pH (6.5) and BW should be avoided due to harmful effects on the fitness and development of seahorse juveniles.
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Affiliation(s)
- Mario D. D. Carneiro
- Department of Ecology and Marine Resources, Institute of Marine Research (CSIC), 36208 Vigo, Spain
- Laboratório de Piscicultura Estuarina e Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande–FURG, Rio Grande 96210-030, Brazil
- Correspondence: (M.D.D.C.); (M.P.); Tel.: +34-986214457 (M.P.)
| | - Sergio García-Mesa
- Department of Zoology, University of Granada, Campus Universitario de Fuentenueva, 18071 Granada, Spain
| | - Luis A. Sampaio
- Laboratório de Piscicultura Estuarina e Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande–FURG, Rio Grande 96210-030, Brazil
| | - Miquel Planas
- Department of Ecology and Marine Resources, Institute of Marine Research (CSIC), 36208 Vigo, Spain
- Correspondence: (M.D.D.C.); (M.P.); Tel.: +34-986214457 (M.P.)
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Holt WV, Fazeli A, Otero-Ferrer F. Sperm transport and male pregnancy in seahorses: An unusual model for reproductive science. Anim Reprod Sci 2022; 246:106854. [PMID: 34579988 DOI: 10.1016/j.anireprosci.2021.106854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 09/14/2021] [Accepted: 09/15/2021] [Indexed: 12/14/2022]
Abstract
The Syngnathidae (seahorses and pipefishes) are a group of teleost fishes in which, uniquely, developing embryos are hosted throughout pregnancy by males, using a specialized brood pouch situated on the abdomen or tail. Seahorses have evolved the most advanced form of brood pouch, whereby zygotes and embryos are intimately connected to the host's circulatory system and also bathed in pouch fluid. The pouch is closed to the external environment and has to perform functions such as gaseous exchange, removal of waste and maintenance of appropriate osmotic conditions, much like the mammalian placenta. Fertilization of the oocytes occurs within the brood pouch, but unlike the mammalian situation the sperm transport mechanism from the ejaculatory duct towards the pouch is unclear, and the sperm: egg ratio (about 5:1) is possibly the least of any vertebrate. In this review, there is highlighting of the difficulty of elucidating the sperm transport mechanism, based on studies of Hippocampus kuda. The similarities between seahorse pouch function and the mammalian placenta have led to suggestions that the pouch provides important nutritional support for the developing embryos, supplementing the nutritional functions of the yolk sac provided by the oocytes. In this review, there is a description of the recent evidence in support of this hypothesis, and also emphasis, as in mammals, that embryonic development depends on nutritional support from the placenta-like pouch at important stages of the gestational period ("critical windows").
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Affiliation(s)
- William V Holt
- Academic Unit of Reproductive and Developmental Medicine, Department of Oncology and Metabolism, University of Sheffield, Level 4, Jessop Wing, Tree Root Walk, Sheffield S10 2SF, UK.
| | - Alireza Fazeli
- Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, Tartu, Estonia; Department of Pathophysiology, Institute of Biomedicine and Translational Medicine, Faculty of Medicine, Tartu University, Tartu, Estonia; Academic Unit of Reproductive and Developmental Medicine, Department of Oncology and Metabolism, Medical School, University of Sheffield, Sheffield, UK
| | - Francisco Otero-Ferrer
- University Institute of Sustainable Aquaculture and Marine Ecosystems (IU ECOAQUA) Scientific and Technological Marine Park, University of Las Palmas de Gran Canaria, 35200, Spain
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Hernández-Urcera J, Dias Carneiro MD, Planas M. Turnover Rates and Diet–Tissue Discrimination Factors of Nitrogen and Carbon Stable Isotopes in Seahorse Hippocampus reidi Juveniles Following a Laboratory Diet Shift. Animals (Basel) 2022; 12:ani12101232. [PMID: 35625079 PMCID: PMC9138056 DOI: 10.3390/ani12101232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/27/2022] [Accepted: 05/08/2022] [Indexed: 02/05/2023] Open
Abstract
Simple Summary The main aim of the present study was to ascertain the effect of two feeding schedules (including copepods and Artemia nauplii) on the early development and physiology of seahorse Hippocampus reidi juveniles. For that, we analyzed seahorse performance (growth and survival) and trophic patterns by means of stable isotopes. Our results highlight that the welfare and condition of juveniles were enhanced by extending the period of feeding on copepods up to day 10 after the male’s pouch release. The analysis of turnover rates for δ13C and δ15N revealed that switching copepods to Artemia nauplii at earlier developmental stages would reduce prey assimilation resulting in lower growth rates and survivals. The present study also provides for the diet–tissue discrimination factors for δ13C and δ15N in seahorse juveniles for the first time. Abstract The initial development of seahorse juveniles is characterized by low digestion capabilities. Stable isotope analysis is an effective tool in studies of trophic food webs and animal feeding patterns. The present study provides new insights for the understanding of growth and food assimilation in early developing seahorses following a laboratory diet switch. The study was performed in the early life stages of the seahorse Hippocampus reidi by assessing the influence of diet shift on changes and turnovers in carbon (δ13C) and nitrogen (δ15N) stable isotope in juveniles. Newborn seahorses were fed for 60 days following two feeding schedules (A6 and A11) based initially on copepods Acartia tonsa and subsequently on Artemia nauplii (since days 6 and 11, respectively). After the prey shift, we determined δ13C and δ15N turnover rates as functions of change in either body mass (fitting model G) and days of development (fitting model D), contributions of metabolism and growth to those turnover rates, and diet–tissue discrimination factors. Survival, final dry weight, and final standard length for diet A11 were higher compared to diet A6. The shift from copepods to Artemia led to fast initial enrichments in δ13C and δ15N. Afterwards, the enrichment was gradually reduced until the isotopic equilibrium with the diet was reached. In most cases, both fitting models performed similarly. The isotopic analysis revealed that 100% of tissue turnover was attributed to growth in diet A11, whereas 19–25% was linked to metabolism in diet A6. Diet–tissue discrimination factors were estimated for the first time in seahorse juveniles, resulting in higher estimates for diet A11 (2.9 ± 0.7‰ for δ13C; 2.5 ± 0.2‰ for δ15N) than in diet A6 (1.8 ± 0.1‰ for δ13C; 1.9 ± 0.1‰ for δ15N). This study highlights the relevance of feeding on copepods and their effect on isotopic patterns and discrimination factors in seahorse juveniles after a dietary shift. Regarding the application of the results achieved in relation to the feeding schedules in the rearing of H. reidi, a long period of feeding on copepods during the first days of development is highly recommended.
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Affiliation(s)
- Jorge Hernández-Urcera
- Department of Ecology and Marine Resources, Institute of Marine Research (CSIC), 36208 Vigo, Spain;
- Correspondence: (J.H.-U.); (M.P.); Tel.: +34-986231930 (J.H.-U.); +34-986214457 (M.P.)
| | - Mario Davi Dias Carneiro
- Department of Ecology and Marine Resources, Institute of Marine Research (CSIC), 36208 Vigo, Spain;
- Laboratório de Piscicultura Estuarina e Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande–FURG, Rio Grande 96201, RS, Brazil
| | - Miquel Planas
- Department of Ecology and Marine Resources, Institute of Marine Research (CSIC), 36208 Vigo, Spain;
- Correspondence: (J.H.-U.); (M.P.); Tel.: +34-986231930 (J.H.-U.); +34-986214457 (M.P.)
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Senarat S, Kettratad J, Pairohakul S, Ampawong S, Huggins BP, Coleman MM, Kaneko G. An update on the evolutionary origin of aglomerular kidney with structural and ultrastructural descriptions of the kidney in three fish species. J Fish Biol 2022; 100:1283-1298. [PMID: 35342946 DOI: 10.1111/jfb.15045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 03/08/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
The kidney of fish contains numerous nephrons, each of which is divided into the renal corpuscle and renal tubules. This glomerular structure is the filtration unit of the nephron and is important for the kidney function, but it has been reported that the renal corpuscle was lost in at least four independent linages of fish (i.e., aglomerular kidney). In this study, the authors newly described renal structures for three species by histological and ultrastructural observations: two aglomerular kidneys from a seahorse Hippocampus barbouri and a toadfish Allenbatrachus grunniens and a glomerular kidney from a snake eel Pisodonophis boro. The renal development of H. barbouri was also described during 1-35 days after birth. In all species tested, the anterior kidney was comprised of haematopoietic tissues and a few renal tubules, whereas the posterior kidney contained more renal tubules. Although the glomerular structure was present in P. boro, light microscopic observations identified no glomeruli in the kidney of H. barbouri and A. grunniens. Ultrastructurally, abundant deep basal infoldings with mitochondria in the renal tubules were observed in A. grunniens compared to H. barbouri and P. boro, suggesting the possible role of basal infoldings in maintaining the osmotic balance. By integrating the results from the three species and comprehensive literature search, the authors further showed that 56 species have been reported to be aglomerular, and that the aglomerular kidney has evolved at least eight times in bony fishes.
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Affiliation(s)
- Sinlapachai Senarat
- Department of Marine Science and Environment, Faculty of Science and Fisheries Technology, Rajamangala University of Technology Srivijaya, Trang, Thailand
| | - Jes Kettratad
- Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Supanut Pairohakul
- Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Sumate Ampawong
- Department of Tropical Pathology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Brian P Huggins
- College of Natural and Applied Science, University of Houston-Victoria, Victoria, Texas, USA
| | - Melissa M Coleman
- College of Natural and Applied Science, University of Houston-Victoria, Victoria, Texas, USA
| | - Gen Kaneko
- College of Natural and Applied Science, University of Houston-Victoria, Victoria, Texas, USA
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Suarez-Bregua P, Rosendo S, Comesaña P, Sánchez-Ruiloba L, Morán P, Planas M, Rotllant J. Dynamic changes in DNA methylation during seahorse (Hippocampus reidi) postnatal development and settlement. Front Zool 2021; 18:52. [PMID: 34627317 PMCID: PMC8502395 DOI: 10.1186/s12983-021-00436-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 09/22/2021] [Indexed: 11/30/2022] Open
Abstract
Introduction Most living marine organisms have a biphasic life cycle dependent on metamorphosis and settlement. These critical life-history events mean that a developmentally competent larva undergoes a range of coordinated morphological and physiological changes that are in synchrony with the ecological transition from a pelagic to a benthonic lifestyle. Therefore, transition from a pelagic to a benthonic habitat requires multiple adaptations, however, the underlying mechanisms regulating this process still remains unclear. Epigenetic regulation and specifically DNA methylation, has been suggested to be particularly important for organisms to adapt to new environments. Seahorses (Family Syngnathidae, Genus Hippocampus) are a fascinating group of fish, distinguished by their unique anatomical features, reproductive strategy and behavior. They are unique among vertebrate species due to their “male pregnancy”, where males nourish developing embryos and larvae in a brood pouch until hatching and parturition occurs. After birth, free-swimming offspring are pelagic and subsequently they change into a demersal lifestyle. Therefore, to begin to address the question whether epigenetic processes could be involved in the transition from a planktonic to a benthonic lifestyle observed in seahorses, we studied global DNA methylation profiles in a tropical seahorse species (Hippocampus reidi) during postnatal development and settlement. Results We performed methylation-sensitive amplified polymorphism (MSAP) along with quantitative expression analysis for genes suggested to be involved in the methylation machinery at six age groups: 1, 5, 10, 20, 30 and 40 days after male’s pouch release (DAR). Results revealed that the H. reidi genome has a significantly different DNA methylation profile during postnatal development and settlement on demersal habitats. Moreover, gene expression analysis showed up- and down-regulation of specific DNA methyltransferases (DNMTs) encoding genes. Conclusion Our data show that the differences in the DNA methylation patterns seen among developmental stages and during the transition from a pelagic to a benthonic lifestyle suggest a potential for epigenetic regulation of gene expression (through DNA methylation) in this species. Therefore, epigenetic mechanisms could be necessary for seahorse settlement. Nevertheless, if these epigenetic mechanisms come from internal or if they are initiated via external environmental cues should be further investigated.
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Affiliation(s)
- Paula Suarez-Bregua
- Acuatic Biotechnology-ACUABIOTEC Lab, Department of Biotechnology and Aquaculture, Marine Research Institute IIM-CSIC, Vigo, Pontevedra, Spain.
| | - Sofia Rosendo
- Acuatic Biotechnology-ACUABIOTEC Lab, Department of Biotechnology and Aquaculture, Marine Research Institute IIM-CSIC, Vigo, Pontevedra, Spain
| | - Pilar Comesaña
- Acuatic Biotechnology-ACUABIOTEC Lab, Department of Biotechnology and Aquaculture, Marine Research Institute IIM-CSIC, Vigo, Pontevedra, Spain
| | - Lucia Sánchez-Ruiloba
- Acuatic Biotechnology-ACUABIOTEC Lab, Department of Biotechnology and Aquaculture, Marine Research Institute IIM-CSIC, Vigo, Pontevedra, Spain
| | - Paloma Morán
- Department of Biochemistry, Genetics and Immunology, University of Vigo, Pontevedra, Spain
| | - Miquel Planas
- Department of Ecology and Marine Resources, Marine Research Institute IIM-CSIC, Vigo, Pontevedra, Spain
| | - Josep Rotllant
- Acuatic Biotechnology-ACUABIOTEC Lab, Department of Biotechnology and Aquaculture, Marine Research Institute IIM-CSIC, Vigo, Pontevedra, Spain.
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Wang X, Wang F, Chen G, Yang B, Chen J, Fang Y, Wang K, Hou Y. Edwardsiella tarda induces enteritis in farmed seahorses (Hippocampus erectus): An experimental model and its evaluation. Fish Shellfish Immunol 2020; 98:391-400. [PMID: 31991232 DOI: 10.1016/j.fsi.2020.01.049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 01/15/2020] [Accepted: 01/23/2020] [Indexed: 06/10/2023]
Abstract
Bacterial enteritis is an important deadly threat to farmed seahorses. However, its pathogenesis is obscure because of the paucity of reproducible experimental intestinal inflammation models. Herein, a strain of Edwardsiella tarda YT1 from farmed seahorse Hippocampus erectus was isolated and identified by morphological, phylogenetic, and biochemical analysis, and confirmed as a pathogen of enteritis for the first time by challenge experiment. Two E. tarda concentrations (1 × 105 and 1 × 107 colony forming units [cfu] ml-1) were confirmed suitable for an enteritis model by intraperitoneal injection. To develop and evaluate the experimental model, we challenged seahorses with E. tarda and found that (1) the infection inhibited body length increase, significantly decreased body weight (P < 0.05), and induced typical pathological features including anorexia, anal inflammation, and intestinal fluid retention; (2) 19 external (weight, height, anal inflammation, feeding status, and intestinal fluid retention), histological (goblet and inflammatory cell numbers and thickening of lamina propria and muscularis mucosae), and molecular (hepcidin, liver-expressed antimicrobial peptide, lysozyme, piscidin, interleukin [IL]-1β, IL-1β receptor, IL-2, IL-10, interferon1, tumor necrosis factor [TNF]-α, and toll-like receptor 5 [TLR5]) indicators were suitable for model evaluation, as they could sensitively respond and varied similarly throughout the experiment, indicating the high sensitivity of seahorses against pathogen invasion; (3) TLR5 may play an essential role in triggering host immune responses during E. tarda-induced chronic enteritis, and (4) the evaluating system could reflect the pattern and intensity of disease progression. Thus, we developed an experimental model and an evaluating system of bacterial enteritis in farmed seahorses, helping us to reveal the pathogenesis of bacterial enteritis, identify potential therapeutic drugs, and search suitable genetic markers for seahorse molecular breeding.
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Affiliation(s)
- Xiaomeng Wang
- School of Life Sciences, Ludong University, Yantai, 264025, China
| | - Fang Wang
- The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong, China
| | - Guozhong Chen
- School of Life Sciences, Ludong University, Yantai, 264025, China
| | - Boya Yang
- School of Agriculture, Ludong University, Yantai, 264025, China
| | - Jun Chen
- School of Agriculture, Ludong University, Yantai, 264025, China
| | - Yan Fang
- School of Agriculture, Ludong University, Yantai, 264025, China
| | - Kai Wang
- School of Agriculture, Ludong University, Yantai, 264025, China.
| | - Yuping Hou
- School of Life Sciences, Ludong University, Yantai, 264025, China.
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Delunardo FAC, Paulino MG, Medeiros LCC, Fernandes MN, Scherer R, Chippari-Gomes AR. Morphological and histopathological changes in seahorse (Hippocampus reidi) gills after exposure to the water-accommodated fraction of diesel oil. Mar Pollut Bull 2020; 150:110769. [PMID: 31785847 DOI: 10.1016/j.marpolbul.2019.110769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 09/28/2019] [Accepted: 11/21/2019] [Indexed: 06/10/2023]
Abstract
Industrial activities and urbanization are the main sources of pollutants in estuarine environments. Diesel, which is widely used in urban and port activities, is an important source of hydrocarbons in the aquatic environment, and its water-accommodated fraction (WAF) is toxic to the local biota. This study was performed to analyze the effects of diesel oil WAF on fish. Specifically, we characterized the gill morphology of the seahorse Hippocampus reidi and analyzed the histopathological changes in the gills after exposure to 50% diesel oil WAF. Acute (12, 24, 48, and 96 h) and subchronic (168 and 336 h) toxicity tests were performed. Furthermore, a recovery protocol was conducted: after exposure to 50% WAF for 168 h, the fish were transferred and kept in seawater without contaminants for 336 h, for a total experimental period of 504 h. The seahorse branchial apparatus was found to be tufted with short filaments; the apical surfaces of the pavement cells in the filament and lamellar epithelia formed "crests" and had microridges. Mitochondria-rich cells were distributed exclusively in the lamellar epithelium, while mucous cells were distributed in the filament epithelium. All pathologies observed after acute and subchronic exposure featured progressive time-dependent alterations of lamellar structure that might disrupt gill physiological and metabolic functions. During the recovery period, the gill alterations were gradually repaired.
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Affiliation(s)
- Frederico Augusto Cariello Delunardo
- Universidade Vila Velha (UVV), Laboratório de Ictiologia Aplicada (LAB PEIXE), Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil.
| | - Marcelo Gustavo Paulino
- Universidade Federal do Tocantins (UFT), Campus Araguaína, Avenida Paraguai, s/n°, 77824-838 Araguaína, TO, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Ciências Fisiológicas, São Carlos, SP, Brazil
| | - Laila Carine Campos Medeiros
- Universidade Vila Velha (UVV), Laboratório de Ictiologia Aplicada (LAB PEIXE), Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil
| | - Marisa Narciso Fernandes
- Universidade Federal de São Carlos (UFSCar), Departamento de Ciências Fisiológicas, São Carlos, SP, Brazil
| | - Rodrigo Scherer
- UVV, Pós Graduação em Ciências Farmacêuticas, Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil
| | - Adriana Regina Chippari-Gomes
- Universidade Vila Velha (UVV), Laboratório de Ictiologia Aplicada (LAB PEIXE), Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil
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Álvarez-hernán G, Andrade JP, Escarabajal-blázquez L, Blasco M, Solana-fajardo J, Martín-partido G, Francisco-morcillo J. Retinal differentiation in syngnathids: comparison in the developmental rate and acquisition of retinal structures in altricial and precocial fish species. ZOOMORPHOLOGY 2019; 138:371-85. [DOI: 10.1007/s00435-019-00447-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Ofelio C, Díaz AO, Radaelli G, Planas M. Histological development of the long-snouted seahorse Hippocampus guttulatus during ontogeny. J Fish Biol 2018; 93:72-87. [PMID: 29882347 DOI: 10.1111/jfb.13668] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 04/22/2018] [Indexed: 06/08/2023]
Abstract
The objective of the present study was to describe histological development of the European long-snouted seahorse Hippocampus guttulatus, to increase understanding of the biology and physiology of the species. Most vital organs were present in juveniles by the time of their release from the male's pouch. Digestive tract specialization occurred at 89 effective day-degrees (D°eff ), corresponding to 15 days post partum (dpp), with development of the first intestinal loop and mucosal folding. At 118 D°eff (20 dpp), lipids were being mobilized from the liver and oocytes attained the perinuclear stage. The fovea emerged at 177 D°eff (30 dpp), contemporaneous with the shift from pelagic to benthic behaviour in juveniles. At this stage, the most interesting feature was the formation of the second intestinal loop. Male gonads were never observed during the study (from 0 to 354 D°eff ; 0-60 dpp), but the first oogonia were present at 30 D°eff (5 dpp). In 354 D°eff (60 dpp) juveniles, oocytes were observed in a cortical alveoli stage, indicating maturity. Low digestive efficiency was observed at early stages, which was due to a poorly developed gastrointestinal tract and an immature digestive tract prior to 89 D°eff . The present study demonstrates that approximately 89 and 177 D°eff represent two important transitional stages in the early development of H. guttulatus. At a temperature of approximately 19 ± 1°C and an age of 1 month (177 D°eff ), main organs were fully functional, suggesting that the adult phenotype was largely established by that age, with females becoming mature at the age of 2 months (354 D°eff ).
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Affiliation(s)
- Claudia Ofelio
- Departamento de Ecología y Recursos Marinos, Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas (IIM-CSIC), Vigo, Spain
| | - Alcira Ofelia Díaz
- Departamento de Biología, Instituto de Investigaciones Marinas y Costeras (IIMyC), FCEyN, CONICET- Universidad Nacional de Mar del Plata, Buenos Aires, Argentina
| | - Giuseppe Radaelli
- Dipartimento di Biomedicina Comparata e Alimentazione, Universitá di Padova, Legnaro, Italy
| | - Miquel Planas
- Departamento de Ecología y Recursos Marinos, Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas (IIM-CSIC), Vigo, Spain
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Novelli B, Otero Ferrer F, Socorro JA, Molina Domínguez L. Early development of the longsnout seahorse Hippocampus reidi (Syngnathidae) within the male brood pouch. J Fish Biol 2018; 92:1975-1984. [PMID: 29660108 DOI: 10.1111/jfb.13631] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 04/02/2018] [Indexed: 06/08/2023]
Abstract
Fertilized and unfertilized eggs and embryos of the longsnout seahorse Hippocampus reidi were collected at different stages of development and provided the basis for a description of morphological development from fertilization until release from the paternal pouch. Images of fertilized eggs, as well as their rupture after a few minutes in seawater are reported for the first time. The yolk sac transitioned from ovoid to spherical shape and was reabsorbed progressively until release. The tail began rising from the surface of the deuteroplasm while embryos were in the egg envelope. Embryos lacked a primordial fin fold and developed some species characteristics, such as rays in the dorsal fin, before resorption of the yolk sac. At release, juvenile seahorses were in an advanced stage of development even if they lacked important adult characteristics, such as ring plates and coronet. The tail was not prehensile in juveniles at release; a small caudal fin was present, although this fin is lost in adults.
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Affiliation(s)
- B Novelli
- Grupo de Investigación en Acuicultura (GIA), IU-ECOAQUA, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, Telde, 35214, Las Palmas, Canary Islands, Spain
| | - F Otero Ferrer
- Grupo en Biodiversidad y Conservación (BIOCON), IU-ECOAQUA, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, Telde, 35214, Las Palmas, Canary Islands, Spain
| | - J A Socorro
- Grupo de Investigación en Acuicultura (GIA), IU-ECOAQUA, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, Telde, 35214, Las Palmas, Canary Islands, Spain
| | - L Molina Domínguez
- Grupo de Investigación en Acuicultura (GIA), IU-ECOAQUA, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, Telde, 35214, Las Palmas, Canary Islands, Spain
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Novelli B, Otero-Ferrer F, Socorro JA, Caballero MJ, Segade-Botella A, Molina Domínguez L. Development of short-snouted seahorse (Hippocampus hippocampus, L. 1758): osteological and morphological aspects. Fish Physiol Biochem 2017; 43:833-848. [PMID: 28124205 DOI: 10.1007/s10695-017-0339-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Accepted: 01/02/2017] [Indexed: 06/06/2023]
Abstract
Information about early development after male release lags behind studies of juveniles and adult seahorses, and newborn seahorses, similar in shape to adults, are considered juveniles or fry. During early life, Hippocampus hippocampus present behavioural (shift in habitat, from planktonic to benthic) and morphological changes; for this reasons, the aims of this study are to define the stage of development of H. hippocampus after they are expelled from the male brood pouch and to establish direct or indirect development through an osteological analysis. The ossification process was studied in 120 individuals, from their release to 30 days after birth. To analyse the osteological development, Alcian Blue-Alizarin Red double staining technique for bone and cartilage was adapted to this species. At birth, H. hippocampus presents a mainly cartilaginous structure that ossifies in approximately 1 month. The bony armour composed of bony rings and plates develops in 10 days. The caudal fin, a structure absent in juveniles and adult seahorses, is present at birth and progressively disappears with age. The absence of adult osteological structure in newborns, like coronet, bony rings and plates, head spines and components allowing tail prehensile abilities, suggests a metamorphosis before the juvenile stage. During the indirect development, the metamorphic stage started inside brood pouch and followed outside and leads up to reconsider the status of H. hippocampus newborns.
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Affiliation(s)
- B Novelli
- Grupo de Investigación en Acuicultura (GIA), IU-Ecoaqua, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain.
| | - F Otero-Ferrer
- Grupo de Investigación en Acuicultura (GIA), IU-Ecoaqua, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain
- Grupo en Biodiversidad y Conservación (BIOCON), Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain
| | - J A Socorro
- Grupo de Investigación en Acuicultura (GIA), IU-Ecoaqua, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain
| | - M J Caballero
- Grupo de Investigación en Acuicultura (GIA), IU-Ecoaqua, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain
| | - A Segade-Botella
- Grupo de Investigación en Acuicultura (GIA), IU-Ecoaqua, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain
| | - L Molina Domínguez
- Grupo de Investigación en Acuicultura (GIA), IU-Ecoaqua, Universidad de las Palmas de Gran Canaria (ULPGC), Ctra. Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain
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