Dinâmica populacional e Atherinella brasiliensis (Quoy &Gaimard, 1824) da praia de Itamambuca, Ubatuba (SP) / Populacional dynamic of the Atherinella brasiliensis (Quoy &Gaimard, 1824) from Itamambuca beach, Ubatuba (SP)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The present study analyzed the life history and metal levels of Atherinella brasiliensis from Itamambuca beach, Ubatuba (SP). Surveys were conducted monthly, in diurnal and nocturnal periods, between September 2003 and February 2005, in four stations at the beach and one at the Itamambuca river, using beach seine. Individuals showed daily migration into the river at nocturnal period. The better adjustment to von Bertalanffy?s model (Lt = 164.85*(1-e-2.16(t+0.0038))) and to longevity (A0.95= 1.378 year) was obtained through Ford-Walford method. The value of estimated L50 for grouped gender was 86.6 mm, and the GSR, the DK and the spawning frequency suggest spawning during all year around, with higher intensity in late spring until middle autumn. The high frequency of spawning and the low batch fecundity indicate that the species is a batch spawner. High concentrations of Cr, Fe and Zn were detected in musculature, being higher among young individuals, and during tourist high season. In conclusion, the Brazilian silverside spends its life cycle on the Itamambuca beach, shows high growth and natural mortality rates, and spawning throughout the year.

ASSUNTO(S)

crescimento trace metals reprodução reproduction mortalidade ubatuba ubatuba longevity metais traço brazil. brasil longevidade atherinella brasiliensis atherinella brasiliensis mortality growth

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