Reduction in size-at-age of black sea bream (Acanthopagrus schlegelii) following intensive releases of cultured juveniles in Hiroshima Bay, Japan

González, Enrique; Murakami, Tomoya; Yoneji, Takashi; Nagasawa, Kazuya; Umino, Tetsuya

doi:10.1016/j.fishres.2009.04.013

Cited by 14 publications

(5 citation statements)

References 20 publications

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“…Finally, studies have concluded that properly conducting restocking programs can effectively increase the number of individuals in WPs (LOPERA-BARRERO et al, 2010a;BARROCA et al, 2012;BLANCO GONZALEZ et al, 2009). In the current study, using the population parameters analyzed, there was no genetic relationship between the WPs and BSs.…”

Section: Genetic Structurementioning

confidence: 99%

Genetic diversity of pacu for restocking programs in the Tietê and Grande rivers, Brazil

Ribeiro

Lopera-Barrero

Santos³

et al. 2015

Sem. Ci. Agr.

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Piaractus mesopotamicus is a tropical fish under threat because of declines in the number of wild populations. Restocking programs have been developed as a conservation method, and the genetic monitoring of populations and broodstocks is important to ensure the viability of such programs. The objective of the current unprecedented experiment was to evaluate the genetic diversity of P. mesopotamicus wild populations (WPs) and broodstocks (BSs) using microsatellites markers for supplying the restocking programs in the Tietê and Grande rivers. Six microsatellite loci were amplified using the DNA obtained from the caudal fin of 279 adult fish. The observed intrapopulation genetic variability was high with mean heterozygosity ranging from 0.203 to 0.833. The number of alleles per locus ranged from three (loci Pme28 and Pme32) to thirteen (loci Pme4, Pme5 and Pme14), and there were allele differences between WPsxWPs and WPsxBSs. This differentiation was confirmed by the dendrogram analysis that showed three specific clusters. Four alleles were shared in the WPs2012xBSs. Positive FIS values indicated the presence of endogamy in seven out of ten samples obtained from the WPs. The AMOVA analysis and FST values indicated moderate and high genetic differences in WPsxWPs and high genetic differences in WPsxBSs. The genetic distance and genetic identity values and number of migrants confirmed these results. Adequate intrapopulation genetic variability, similarity between BSsxBSs, and genetic differences between WPs2011xWPs2012 and WPsxBSs were observed. In the wild, individuals from the restocking program were partially observed. ResumoPiaractus mesopotamicus é um peixe tropical que nos últimos anos tem apresentado uma diminuição no número de populações naturais. Programas de repovoamento vêm sendo utilizados como método de conservação, entretanto, o monitoramento genético das populações e dos estoques de reprodutores é importante para conferir a viabilidade desse tipo de programas. O objetivo do presente estudo foi avaliar de forma inédita a diversidade genética de populações selvagens (WPs) e estoques de reprodutores (BSs) de P. mesopotamicus utilizados em programas de repovoamento dos rios Tietê e Grande, através de marcadores microssatélite. Seis loci microssatélite foram amplificados usando DNA extraído de nadadeira caudal de 279 indivíduos adultos. Foi observada alta variabilidade genética intrapopulacional, com medias de heterozigosidade observada entre 0.203 e 0.833. O número de alelos por locus foi de três (locus Pme28 e Pme32) a 13 (locus Pme4, Pme5 e Pme14) e houve diferenciação de alelos entre WPsxWPs e WPsxBSs. Essa diferenciação foi confirmada pela análise do dendrograma que mostrou a formação de três agrupamentos específicos. Observaram-se quatro alelos compartilhados entre WPs2012xBSs. Valores positivos de F IS mostraram a presença de endogamia em sete das 10 coletas realizadas nas WPs. A análise de AMOVA e do F ST indicou moderada e muito alta diferenciação genética entre WPsxWPs e diferenciação gen...

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Section: Genetic Structurementioning

confidence: 99%

Genetic diversity of pacu for restocking programs in the Tietê and Grande rivers, Brazil

Ribeiro

Lopera-Barrero

Santos³

et al. 2015

Sem. Ci. Agr.

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“…Limited usefulness of stocking has been attributed to the fact that cultured fishes have tended to show lower survival, growth, reproductive fitness and genetic diversity than wild fishes. In a few cases, no obvious adverse effects of hatchery rearing on wild stock were observed, and a positive contribution of hatchery stock to the abundance of fish populations was suggested (Jeong et al , ; Blanco Gonzalez et al , 2008 a , b , 2009; Araki & Schmid, ). In addition, some restocking programmes have proved to be useful for preserving endangered species, such as the beluga sturgeon Huso huso (L. 1758) (Ivanov et al , ; Abdolhay, ).…”

Section: Introductionmentioning

confidence: 99%

Adapting to the wild: the case of aquaculture‐produced and released meagres Argyrosomus regius

Gil

Palmer

Grau

et al. 2013

Journal of Fish Biology

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The performance of juvenile Argyrosomus regius released off the coast of Mallorca Island (Balearic Islands, Spain) was assessed by comparing the body condition, stable isotope signature and stomach contents of aquaculture‐produced A. regius that had been released, fished and returned by fishermen after spending from a few days to >1 year at liberty with A. regius reared under controlled conditions on two contrasting diets (well‐fed and unfed). During the first 40 days of the experiment, the condition index (KR) of the returned A. regius and the unfed A. regius followed the same decreasing trend. Thereafter, the KR values of the returned A. regius were significantly higher than those of the unfed A. regius but never reached the values of well‐fed A. regius. The δ13C signal of the returned A. regius clearly increased (in comparison with the well‐fed A. regius) after they had spent a few months at liberty. The temporal pattern depicted by the stable isotopes and the most likely prey composition inferred from this pattern strongly suggest a shift in diet. The stomach contents of the returned A. regius that had spent <100 days at liberty consisted almost exclusively of decapods. The diet of the few returned A. regius that had spent >100 days at liberty consisted entirely of fishes. Wild A. regius from the remaining fishery on the Spanish coast exhibited the same ontogenetic diet shift from invertebrates to fishes, but at a smaller size threshold. Overall, the results demonstrated that culture‐reared A. regius experience adverse conditions during the first days after release into the wild but that at least some A. regius are able to adapt to the natural environment after a few months at liberty.

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“…Reports from Japan, France, New Zealand, Australia, and other countries have shown that proliferation and release programs do not yield desirable results 18 – 20 . The low contribution rate could be attributed to several factors, including behavioral and health defects in artificially cultured species 21 , 22 , higher predation risks 23 , stocking density, and body size 24 , 25 . Notably, the complex flow conditions in natural environments, in contrast to still water in farms, may also contribute to for their low survival rates 26 , 27 .…”

Section: Introductionmentioning

confidence: 99%

Building adjustment capacity to cope with running water in cultured grass carp through flow stimulation conditions

Xie,

Wang,

Yang

et al. 2024

Sci Rep

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The adaptability of cultured fish to complex flow conditions is crucial for their survival after being released into the wild. Running water in natural environments poses significant challenges for the proliferation and release of cultured fish. This study aimed to investigate the effects of flow stimulation on the adjustment capacity of cultured fish to cope with running water. The target fish were cultured grass carp. An annular flume was used to conduct tests on training and control groups. The results demonstrated an enhancement in the adjustment capacity of cultured fish following appropriate flow stimulation training. (1) The trained fish exhibited a heightened preference for low-velocity areas. (2) The trained fish displayed the ability to select a route characterized by low energy consumption, predominantly following the periphery of the low-velocity area. This suggested that an appropriate flow velocity could improve the sensitivity of training fish to water flow information, and their adjustment capacity to cope with running water improved to a certain extent. A higher adjustment capacity allowed them to process flow rate information rapidly and identify a migration strategy with lower energy consumption. This study provides a useful reference for enhancing the survival rate of grass carp through stock enhancement initiatives and contributes to the sustainability of freshwater ecosystems.

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Reduction in size-at-age of black sea bream (Acanthopagrus schlegelii) following intensive releases of cultured juveniles in Hiroshima Bay, Japan

Cited by 14 publications

References 20 publications

Genetic diversity of pacu for restocking programs in the Tietê and Grande rivers, Brazil

Genetic diversity of pacu for restocking programs in the Tietê and Grande rivers, Brazil

Adapting to the wild: the case of aquaculture‐produced and released meagres Argyrosomus regius

Building adjustment capacity to cope with running water in cultured grass carp through flow stimulation conditions

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