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Growth and age structure in captive and wild stocks of the endangered western ruivaco Achondrostoma occidentale (Cyprinidae)

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Resumo:Declines in freshwater fish populations are occurring at a fast rate, increasing the importance of ex-situ conservation programs supported by sound knowledge of population dynamics and life-history traits of the target species. We analysed the growth and age structure of wild and captive stocks of the western ruivaco Achondrostoma occidentale, a Portuguese endangered cyprinid, targeted for captive breeding and restocking since 2007. Specifically, we compared maximum size, longevity, and length-at-age among captive and wild populations, restocked and non-restocked. We found considerable variation in length-at-age and longevity between captive-bred and wild fish, with the former generally growing faster and living longer. Analysis of length-age distributions among wild populations suggested a positive effect of restocking actions in fish abundance. Results highlight the value of captive breeding for the conservation of endangered cyprinids, and reinforce the need for detailed data on life-history trait variation between captive and wild stocks to assess the efficiency of ex-situ conservation programs.
Autores principais:Mameri, D.
Outros Autores:Santos, Carla Sousa; Robalo, Joana Isabel
Assunto:Captive breeding Endangered cyprinids Mediterranean rivers Recruitment Life-history traits Reprodução em cativeiro Ciprinídeos ameaçados Rios Mediterrânicos Recrutamento Caracteres de história de vida
Ano:2018
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso restrito
Instituição associada:Ispa-Instituto Universitário
Idioma:inglês
Origem:Repositório do Ispa - Instituto Universitário

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