Idade e mudanças no crescimento da pescadinha amarela Macrodon atricauda (Günther, 1880) entre 1976 e 2009 no Sul do Brasil / Age and change in growth of the king weakfish Macrodon atricauda (Günther, 1880) between 1976 and 2009 in Souther Brazil.

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

15/03/2011

RESUMO

The coastal demersal sciaenid Macrodon atricauda (Günther, 1880), formerly M. ancylodon (Bloch and Shneider, 1801) was sampled for ageing in four periods (1976-79, 1984-86, 1995-97 and 2006- 09) from commercial fishing and scientific surveys along Southern Brazil (Lat. 30S to 3440S). Maximum observed age was seven but no fish older than five years was sampled in the last period. Marginal increment analysis on thin sections validated ageing and showed that opaque and translucent bands were laid down at all ages in spring-summer and autumn-winter, respectively.Ageing M. atricauda on sectioned otoliths is highly recommended because comparisons with readings on whole otoliths showed that the last overestimated in one or more years in 56.5% of the aged specimens. The growth of M. atricauda increased in the last four decades, most noticeably for adult males over 2 years old and females over 3 years old. A three fold decrease in its density and the demersal fish community as a whole are the likely cause of the growth increase.

ASSUNTO(S)

comportamento animal brasil macrodon atricauda crescimento denso-dependente otólitos otoliths density-dependent growth macrodon atricauda king weakfish brazil pescadinha amarela

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