Calculating growth parameters of Genidens barbus (Siluriformes, Ariidae) using length composition and age data

作者: G. Velasco , E. G. Reis , J. P. Vieira

DOI: 10.1111/J.1439-0426.2006.00793.X

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摘要: Summary The marine catfish Genidens barbus was once one of the most important estuarine fishery resources in Patos Lagoon (southern Brazil), which had largest population known for species. However, clear signs overfishing have been observed since 1980s. Growth parameters this were estimated by combining length frequency data juveniles and selected published on annuli reading from adult otoliths. This methodology yielded a more realistic set using both specialized generalized von Bertalanffy growth model. The species can be described as: Lt = 118.6[1 − e−0.043(t+1.505)] or Lt = 104.6[1 −e−0.137D(t+4.013)]1/D with surface factor D = 0.542. performance index ϕ′ as 2.78 special (classical) Stock rebuilding is expected to slow, slow-growing, has low natural mortality rate, mouthbreeds small amount large eggs. Resumo O bagre marinho foi um dos recursos pesqueiros mais importantes no estuario da Lagoa (RS, Brasil), sendo esta maior populacao conhecida especie. A partir anos oitenta, entanto, comecou mostrar claros sinais de sobrexploracao. Os parâmetros crescimento desta foram calculados utilizando dados frequencia comprimento juvenis e leitura aneis em otolitos adultos. metodologia utilizada para determinar os neste trabalho mostrou resultados realistas que previamente calculados, tanto quanto utilizados o modelo especial generalizado Bertalanffy. O especie pode ser descrito por ou Lt = 104.6[1 − e−0.137D(t+4.013)]1/D com fator superficie parâmetro calculado (classico). Presume-se recuperacao deste estoque pesqueiro seja demorada ja apresenta lento, mortalidade baixa tem fecundidade.

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