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Pan JM, Zhu KC, Liu J, Guo HY, Liu BS, Zhang N, Xian L, Sun JH, Zhang DC. Cryopreservation of black seabream (Acanthopagrus schlegelii) sperm. Theriogenology 2023; 210:182-191. [PMID: 37517303 DOI: 10.1016/j.theriogenology.2023.07.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/28/2023] [Accepted: 07/22/2023] [Indexed: 08/01/2023]
Abstract
In recent years, biotechnology has had a significant impact on the aquaculture industry, particularly in the field of breeding. Molecular selection breeding has emerged as a novel approach to breeding. Reducing the cost of genetic information for individuals with desirable traits after breeding has become an important research direction. Cryopreservation technology allows bypassing time and space constraints in genetic breeding, simplifying broodstock management. This study presents a detailed cryopreservation method for black seabream sperm, evaluating extender type, glucose concentration, cryoprotectant type and concentration, sperm-dilution ratio, and cooling protocols. Sperm motility parameters were analyzed using computer-assisted sperm analysis (CASA) before and after two days of freezing. This involved using an RS solution with a glucose concentration of 15 g/L and adding a 5% final concentration of EG as the sperm cryoprotectant. After mixing the sperm and solution at a ratio of 1:2, we subjected it to 5 min fumigation at 5 cm above the liquid nitrogen surface before plunging it into the nitrogen. Sperm motility reached 85.46 ± 7.32% after two days. Various enzymatic activities showed changes over 20 days post-cryopreservation. This improved cryopreservation protocol for black seabream sperm is beneficial for genetic breeding and reproduction and provides reference for studying the cryodamage mechanisms of black seabream sperm.
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Affiliation(s)
- Jin-Min Pan
- College of Fisheries, Tianjin Agricultural University, 300384, Tianjin, PR China; Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China
| | - Ke-Cheng Zhu
- Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China; Sanya Tropical Fisheries Research Institute, Sanya, 572018, PR China; Guangdong Provincial Engineer Technology Research Center of Marine Biological Seed Industry, Guangzhou, Guangdong Province, PR China
| | - Jun Liu
- Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China
| | - Hua-Yang Guo
- Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China; Sanya Tropical Fisheries Research Institute, Sanya, 572018, PR China
| | - Bao-Suo Liu
- Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China; Sanya Tropical Fisheries Research Institute, Sanya, 572018, PR China; Guangdong Provincial Engineer Technology Research Center of Marine Biological Seed Industry, Guangzhou, Guangdong Province, PR China
| | - Nan Zhang
- Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China; Sanya Tropical Fisheries Research Institute, Sanya, 572018, PR China; Guangdong Provincial Engineer Technology Research Center of Marine Biological Seed Industry, Guangzhou, Guangdong Province, PR China
| | - Lin Xian
- Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China; Sanya Tropical Fisheries Research Institute, Sanya, 572018, PR China; Guangdong Provincial Engineer Technology Research Center of Marine Biological Seed Industry, Guangzhou, Guangdong Province, PR China
| | - Jin-Hui Sun
- Guangdong Provincial Engineer Technology Research Center of Marine Biological Seed Industry, Guangzhou, Guangdong Province, PR China.
| | - Dian-Chang Zhang
- Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 510300, Guangzhou, Guangdong Province, PR China; Sanya Tropical Fisheries Research Institute, Sanya, 572018, PR China; Guangdong Provincial Engineer Technology Research Center of Marine Biological Seed Industry, Guangzhou, Guangdong Province, PR China.
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Piazza YG, Lozano IE, Llamazares Vegh S, Lo Nostro FL, Fuentes CM. Integrative study of the reproductive biology and growth of Acestrorhynchus pantaneiro Menezes, 1992 (Characiformes, Acestrorhynchidae). JOURNAL OF FISH BIOLOGY 2023; 102:977-991. [PMID: 36744697 DOI: 10.1111/jfb.15338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 01/30/2023] [Indexed: 06/18/2023]
Abstract
We studied the reproductive strategy, sexual system and growth of dientudo paraguayo Acestrorhynchus pantaneiro. After 2 years of monitoring in shallow areas of a floodplain lake from the lower Paraná basin (Argentina), it was evidenced that water temperature modulated gonadal maturation, but it was the river water level the synchronising stimulus that triggered spawning. This species exhibited a single annual breeding period from October to January, with most spawning activity in November. According to the von Bertalanffy growth curve, fish would reach autumn to winter months with LS of ~120 mm, already mature males. The first mature females were found at LS of 210 mm, becoming sexually mature between the second and third breeding seasons. This is the first integrative study that includes the body-length frequency distribution and sex differential size at first maturity and growth, and reports the presence of intersex gonads questioning its sexual pattern from gonochoristic to sequential hermaphrodite species. The sexual pattern, the multiple spawning behaviour and a medium to high absolute fecundity support the opportunistic and invasive behavior observed in previous contributions for this characiform species.
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Affiliation(s)
- Yanina G Piazza
- Laboratorio de Ecotoxicología Acuática, Instituto de Biodiversidad y Biología Experimental y Aplicada, (IBBEA, CONICET-UBA), Buenos Aires, Argentina
| | - Ismael E Lozano
- Laboratorio de Ecotoxicología Acuática, Instituto de Biodiversidad y Biología Experimental y Aplicada, (IBBEA, CONICET-UBA), Buenos Aires, Argentina
| | - Sabina Llamazares Vegh
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Investigaciones en Producción Animal (INPA, CONICET-UBA), Buenos Aires, Argentina
| | - Fabiana L Lo Nostro
- Laboratorio de Ecotoxicología Acuática, Instituto de Biodiversidad y Biología Experimental y Aplicada, (IBBEA, CONICET-UBA), Buenos Aires, Argentina
- Laboratorio de Ecotoxicología Acuática, Departamento de Biodiversidad y Biología Experimental (DBBE), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Carlos M Fuentes
- Programa de Aguas Continentales, Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Buenos Aires, Argentina
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Kawai K, Fujita H, Deville D, Umino T. Spawning time of black sea bream Acanthopagrus schlegelii, related to underwater photoperiodism in oyster farms. JOURNAL OF FISH BIOLOGY 2022; 101:1142-1149. [PMID: 35880803 DOI: 10.1111/jfb.15179] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
The embryonic development times, spawning timing and hatching rates of the black sea bream Acanthopagrus schlegelii were examined to investigate the potential effect of seawater temperature, tides and photoperiod on the reproductive rhythm of this species in Hiroshima Bay, Japan. Low temperatures decreased hatching rates and extended the hatching time, and the minimum temperature threshold for hatching was 15°C. Back-calculated spawning times indicated that the peak of spawning occurred just before sunset and the reduction in diurnal light intensity around the oyster rafts acted as a trigger for spawning. In contrast, no correlation was found between spawning rhythms and tidal cycle. The results highlight the important role of oyster farms in the reproductive cycle and population dynamics of A. schlegelii in Hiroshima Bay, the main spawning ground for this species in Japan. The study findings provide insights for the sustainable management of this important sparid species.
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Affiliation(s)
- Kentaro Kawai
- Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Hiroki Fujita
- Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Diego Deville
- Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Tetsuya Umino
- Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
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Goldsworthy NC, Srinivasan M, Smallhorn‐West P, Cheah L, Munday PL, Jones GP. Life-history constraints, short adult life span and reproductive strategies in coral reef gobies of the genus Trimma. JOURNAL OF FISH BIOLOGY 2022; 101:996-1007. [PMID: 35818109 PMCID: PMC9796689 DOI: 10.1111/jfb.15161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 07/05/2022] [Indexed: 05/26/2023]
Abstract
Body size influences many life-history traits, with small-bodied animals tending to have short life spans, high mortality and greater reproductive effort early in life. In this study, the authors investigated the life-history traits and reproductive strategies of three small-bodied coral reef gobies of the genus Trimma: Trimma benjamini, Trimma capostriatum and Trimma yanoi. The authors found all Trimma species studied attained a small body size of <25 mm, had a short life span of <140 days and experienced high estimated daily mortality of 3.0%-6.7%. Furthermore, the pelagic larval phase accounted for 25.3%-28.5% of the maximum life span, and maturation occurred between 74.1 and 82.1 days at 15.2-15.8 mm, leaving only 35%-43% of the total life span as a reproductively viable adult. All mature individuals had gonad structures consistent with bidirectional sex change, with bisexual gonads including both ovarian and testicular portions separated by a thin wall of connective tissue. In the female and male phases, only ovaries or testes were mature, whereas gonadal tissue of the non-active sex remained. One T. benjamini individual and one T. yanoi individual had ovarian and testicular tissue active simultaneously. The results of this study highlight the life-history challenges small CRFs face on their path to reproduction and reproductive strategies that could be beneficial in fishes with high and unpredictable mortality and short reproductive life spans.
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Affiliation(s)
- Nisha C. Goldsworthy
- Australian Research Council Centre of Excellence for Coral Reef StudiesJames Cook UniversityTownsvilleQueenslandAustralia
- Marine Biology and AquacultureJames Cook UniversityTownsvilleQueenslandAustralia
- College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
| | - Maya Srinivasan
- Marine Biology and AquacultureJames Cook UniversityTownsvilleQueenslandAustralia
- College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
| | - Patrick Smallhorn‐West
- Australian Research Council Centre of Excellence for Coral Reef StudiesJames Cook UniversityTownsvilleQueenslandAustralia
- WorldFishBayan LepasPenangMalaysia
| | - Lit‐Chien Cheah
- Division of Tropical Environments & SocietiesJames Cook UniversityTownsvilleQueenslandAustralia
| | - Philip L. Munday
- Australian Research Council Centre of Excellence for Coral Reef StudiesJames Cook UniversityTownsvilleQueenslandAustralia
| | - Geoffrey P. Jones
- Australian Research Council Centre of Excellence for Coral Reef StudiesJames Cook UniversityTownsvilleQueenslandAustralia
- Marine Biology and AquacultureJames Cook UniversityTownsvilleQueenslandAustralia
- College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
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Kawai K, Fujita H, Umino T. The complete mitochondrial genome of Acanthopagrus pacificus (Perciformes, Sparidae) from Iriomotejima Island, Okinawa, Japan. Mitochondrial DNA B Resour 2022; 7:1027-1029. [PMID: 35756456 PMCID: PMC9225699 DOI: 10.1080/23802359.2022.2080606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Affiliation(s)
- Kentaro Kawai
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Hiroki Fujita
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Tetsuya Umino
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
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Genetic Evaluation of Black Sea Bream (Acanthopagrus schlegelii) Stock Enhancement in the South China Sea Based on Microsatellite DNA Markers. FISHES 2021. [DOI: 10.3390/fishes6040047] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This is the first genetic evaluation of hatchery-based stock enhancement of black sea bream (Acanthopagrus schlegelii) in the South China Sea after a two-year monitoring period. In this study, microsatellite DNA markers were used to calculate the contribution rate and analyze genetic changes before and after stock enhancement. Two out of one hundred and sixty nine individuals from three recaptured populations were assigned to broodstock with a contribution rate of 1.18%, revealing that the hatchery-released juvenile fish could survive in the natural environment and had a positive effect on population replenishment in wild black sea bream abundance. However, we found that the release population had the lowest genetic diversity and significant genetic differentiation from other populations. In addition, genetic diversity detected in the recaptured population was lower than that in the wild population, and their genetic differentiation reached a significant level. Our results suggested that releasing cultured black sea bream juveniles with low genetic quality might be genetically harmful for the maintenance of wild genotypes. Therefore, it is necessary to assess the genetic variation of the hatchery population before implementing a stock enhancement and establish a long-term evaluation for monitoring the genetic effect caused by releasing this fish species.
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Kawai K, Fujita H, Sanchez G, Umino T. Oyster farms are the main spawning grounds of the black sea bream Acanthopagrus schlegelii in Hiroshima Bay, Japan. PeerJ 2021; 9:e11475. [PMID: 34131521 PMCID: PMC8176910 DOI: 10.7717/peerj.11475] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 04/26/2021] [Indexed: 11/20/2022] Open
Abstract
Understanding the anthropogenic impact of oyster farms is essential for the management and conservation of marine fishes. In Japan, Hiroshima Bay is the region with the most intense oyster farming and thus suitable to study the impact of these farms. Here, we surveyed spherical planktonic eggs of the black sea bream Acanthopagrus schlegelii, one of the most abundant fish in the Bay. Our survey was performed at fourteen stations which included places with oyster farms and historical spawning grounds. We found the highest egg densities in four stations, one with historical spawning aggregations and three with major oyster farms. Besides, surveys at the innermost part of Hiroshima Bay, where two major rivers discharge, showed a low density of eggs indicating that black sea bream avoids spawning in low salinity areas. Our study suggests that oyster farms benefit spawners of black sea bream by providing more food sources than historical spawning grounds for efficient spawning. Yet, whether oyster farms represent a full advantage for the species remains unclear, particularly because they are known to host jellyfishes that prey on eggs and limit water flow that can influence the survival of fish eggs.
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Affiliation(s)
- Kentaro Kawai
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi Hiroshima, Hiroshima, Japan
| | - Hiroki Fujita
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi Hiroshima, Hiroshima, Japan
| | - Gustavo Sanchez
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi Hiroshima, Hiroshima, Japan
| | - Tetsuya Umino
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi Hiroshima, Hiroshima, Japan
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Young JM, Yeiser BG, Whittington JA, Dutka-Gianelli J. Maturation of female common snook Centropomus undecimalis: implications for managing protandrous fishes. JOURNAL OF FISH BIOLOGY 2020; 97:1317-1331. [PMID: 32725619 DOI: 10.1111/jfb.14475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 07/17/2020] [Accepted: 07/23/2020] [Indexed: 06/11/2023]
Abstract
The assumption for hermaphroditic fish species that mature individuals of the terminal sex arise directly from mature individuals of the primary sex has led to the use of sex ratios as a proxy for age at maturity (A50 ). The timing of transition and deficient energy reserves, however, can result in a delay between transition and spawning. To test the assumption of female maturity and investigate the relationship between maturation and energy reserves, common snook, Centropomus undecimalis, a protandrous hermaphrodite, were collected from rivers, estuaries, inlets and offshore habitats on the east coast of Florida during 2010-2015. Immature females were observed every month, with lowest proportions during the peak spawning months of July and August. When calculated based on sex ratio, A50 (8.1 years) overestimated the age at which 50% of the female population was, in fact, mature (4.1-4.9 years). Best-fit models indicate that mesenteric fat index (IF ) and hepato-somatic index (IH ) were significantly affected by gonad phase, month and size and weakly by habitat. In post hoc analysis, immature female IF did not differ significantly from developing and regenerating females, but immature female IH was significantly lower than that for all mature phases except animals in the regressing phase. Although immature females may have sufficient energy in terms of fat, it appears that energy is not allocated to reproductive processes, as evidenced by lower IH . Nonetheless, approximately 95% of females were spawning-capable during peak spawning months, suggesting that the energy threshold at which immature females reach maturity is met by most females each spawning cycle.
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Affiliation(s)
- Joy M Young
- Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, Tequesta Field Laboratory, Tequesta, Florida, USA
| | - Beau G Yeiser
- Florida Fish and Wildlife Conservation Commission, South Regional Office, West Palm Beach, Florida, USA
| | - James A Whittington
- Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, Tequesta Field Laboratory, Tequesta, Florida, USA
| | - Jynessa Dutka-Gianelli
- Gloucester Marine Station, University of Massachusetts Amherst, Gloucester, Massachusetts, USA
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Zhang K, Cai Y, Liao B, Jiang Y, Sun M, Su L, Chen Z. Population dynamics of threadfin porgy Evynnis cardinalis, an endangered species on the IUCN red list in the Beibu Gulf, South China Sea. JOURNAL OF FISH BIOLOGY 2020; 97:479-489. [PMID: 32419217 DOI: 10.1111/jfb.14398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 03/18/2020] [Accepted: 05/15/2020] [Indexed: 06/11/2023]
Abstract
Threadfin porgy Evynnis cardinalis is both a dominant fish species and an important fishing target in bottom trawl fisheries in the Beibu Gulf, South China Sea. It was listed as endangered (EN) in a recent International Union for Conservation of Nature (IUCN) red list. Despite its economic importance and endangered status, limited research on its biological characteristics and spatial-temporal distribution has been undertaken this last decade, creating uncertainty in current conservation and management. We analyse this species' spatial distribution characteristics using data from four seasonal bottom trawl surveys in 2014-2015, and report average catch per unit effort to vary seasonally, from 49.1 to 594.5 ind h-1 . Growth, mortality and sexual maturity are reported for four time periods based on data from bottom trawl fishery surveys over 1961-1962, 1998-1999, 2006, and 2014-2015. Length frequency distributions changed from bimodal to unimodal, and the female-to-male ratio increased. Mean body length and length at first maturity decreased, whereas the growth coefficient increased, indicating miniaturization, early sexual maturity and accelerated growth, respectively. We report sparid catch to have first exceeded maximum sustainable yield in 2001, and to have remained overfished from 2010 to 2015. Since the 1980s, low-trophic-level fishes such as E. cardinalis have replaced high-trophic-level fishes such as Crimson snapper Lutjanus erythropterus to become dominant species. As catches have increased substantially, these species have been faced with overfishing, driving the ecosystem into an unstable state.
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Affiliation(s)
- Kui Zhang
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China
- Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
- Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China
| | - Yancong Cai
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China
- Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Baochao Liao
- Department of Mathematics, Shandong University, Weihai, China
| | - Yan'e Jiang
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China
- Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Mingshuai Sun
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China
- Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Li Su
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China
- Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Zuozhi Chen
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China
- Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
- Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China
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Wang X, Liu S, Yang Y, Wu L, Huang W, Wu R, Li G, Zhang H, Meng Z. Genetic evidence for the mating system and reproductive success of black sea bream ( Acanthopagrus schlegelii). Ecol Evol 2020; 10:4483-4494. [PMID: 32489612 PMCID: PMC7246203 DOI: 10.1002/ece3.6215] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 11/11/2022] Open
Abstract
Understanding the mating system and reproductive success of a species provides evidence for sexual selection. We examined the mating system and the reproductive success of captive adult black sea bream (Acanthopagrus schlegelii), using parentage assignment based on two microsatellites multiplex PCR systems, with 91.5% accuracy in a mixed family (29 sires, 25 dams, and 200 offspring). Based on the parentage result, we found that 93.1% of males and 100% of females participated in reproduction. A total of 79% of males and 92% of females mated with multiple partners (only 1 sire and 1 dam were monogamous), indicating that polygynandry best described the genetic mating system of black sea bream. For males, maximizing the reproductive success by multiple mating was accorded with the sexual selection theory while the material benefits hypothesis may contribute to explain the multiple mating for females. For both sexes, there was a significant correlation between mating success and reproductive success and the variance in reproductive success of males was higher than females. Variation in mating success is the greatest determinant to variation in reproductive success when the relationship is strongly positive. The opportunity for sexual selection of males was twice that of females, as well as the higher slope of the Bateman curve in males suggested that the intensity of intrasexual selection of males was higher than females. Thus, male-male competition would lead to the greater variation of mating success for males, which caused greater variation in reproductive success in males. The effective population number of breeders (N b) was 33, and the N b/N ratio was 0.61, slightly higher than the general ratio in polygynandrous fish populations which possibly because most individuals mated and had offspring with a low variance. The relatively high N b contributes to the maintenance of genetic diversity in farmed black sea bream populations.
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Affiliation(s)
- Xi Wang
- State Key Laboratory of BiocontrolInstitute of Aquatic Economic Animals and the Guangdong Province Key Laboratory for Aquatic Economic AnimalsSchool of Life SciencesSun Yat‐Sen UniversityGuangzhouChina
| | - Su Liu
- Marine Fisheries Development Center of Guangdong ProvinceHuizhouChina
| | - Yuqing Yang
- Marine Fisheries Development Center of Guangdong ProvinceHuizhouChina
| | - Lina Wu
- State Key Laboratory of BiocontrolInstitute of Aquatic Economic Animals and the Guangdong Province Key Laboratory for Aquatic Economic AnimalsSchool of Life SciencesSun Yat‐Sen UniversityGuangzhouChina
| | - Wenhua Huang
- State Key Laboratory of BiocontrolInstitute of Aquatic Economic Animals and the Guangdong Province Key Laboratory for Aquatic Economic AnimalsSchool of Life SciencesSun Yat‐Sen UniversityGuangzhouChina
| | - Renxie Wu
- College of FisheriesGuangdong Ocean UniversityZhanjiangChina
| | - Guangli Li
- College of FisheriesGuangdong Ocean UniversityZhanjiangChina
| | - Haifa Zhang
- Marine Fisheries Development Center of Guangdong ProvinceHuizhouChina
| | - Zining Meng
- State Key Laboratory of BiocontrolInstitute of Aquatic Economic Animals and the Guangdong Province Key Laboratory for Aquatic Economic AnimalsSchool of Life SciencesSun Yat‐Sen UniversityGuangzhouChina
- Southern Laboratory of Ocean Science and EngineeringZhuhaiChina
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Law CSW, Sadovy de Mitcheson Y. Age and growth of black seabream Acanthopagrus schlegelii(Sparidae) in Hong Kong and adjacent waters of the northern South China Sea. JOURNAL OF FISH BIOLOGY 2018; 93:382-390. [PMID: 30069882 DOI: 10.1111/jfb.13774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Accepted: 08/01/2018] [Indexed: 06/08/2023]
Abstract
Age and growth of the black seabream Acanthopagrus schlegelii (family Sparidae) from the northern South China Sea (NSCS) were studied by reading growth rings in sectioned sagittal otoliths. Ring formation frequency was determined to be annual by using marginal increment analysis. The von Bertalanffy growth function parameters were estimated as: L∞ = 43.7 cm LS ; K =0.22 year; t0 = -1.59 years. Functional males are significantly younger than functional females, with sexually transitional individuals between the modal ages of males and females supporting protandry in this species. Males become sexually mature within 1 year and 50% age at sex change is at 2 years. The maximum age recorded for both males and females sampled was 9 years which is lower than for conspecifics elsewhere and may reflect high fishing pressure in the study area when compared with conspecifics in other areas or could reflect latitudinal effects. Otolith mass was significantly and positively related to age, providing a cheap and quick alternative method for approximating age. Acanthopagrus schlegelii is a relatively fast-growing and rapidly maturing species attaining a similar asymptotic length to conspecifics. A need for fishery management is indicated to protect both young juveniles and older adults, especially females, to increase reproductive output and safeguard fishery production.
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Affiliation(s)
- Calton S W Law
- School of Biological Sciences and The Swire Institute of Marine Science, The University of Hong Kong, Hong Kong SAR, China
| | - Yvonne Sadovy de Mitcheson
- School of Biological Sciences and The Swire Institute of Marine Science, The University of Hong Kong, Hong Kong SAR, China
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