(Aspects of the populational structure and reprodutive period of the "tambiú” Astyanax bimaculatus [Characiformes, Characidae] in Bariri Reservoir, Tietê River, São Paulo State, Brazil)

Authors

  • Arlete Mota RODRIGUES Pesquisador Cientí­­fico - Base de Pesquisas-  Divisão de Pesca Interior - Instituto de Pesca
  • Jair Duarte RODRIGUES Pesquisador Cientí­­fico - Base de Pesquisas-  Divisão de Pesca Interior - Instituto de Pesca
  • Elmar Cardozo CAMPOS Pesquisador Cientí­­fico - Seção de Controle e Orientação da Pesca -  Divisão de Pesca Interior - Instituto de Pesca
  • Antonio Eugênio FERREIRA Pesquisador Cientí­­fico - Base de Pesquisas-  Divisão de Pesca Interior - Instituto de Pesca

Keywords:

tambiú, sex-ratio, structure in length, weight-length relation

Abstract

In this paper, 2,070 specimens of "tambiu", Astyanax bimaculatus, caught in Bariri reservoir during the period of January, 1978 to December, 1982, were analyzed. The objective was to study aspects of populational structure in distinct seasons of the year and reproductive period. The results indicated that the proportion sex ratio was about 1:1, significant to leveI of 5%. The females attain superior length in relation to males and they are predominant in the larger length classes. It was observed that the reproduction happens in spring and summer, with maximum reproductive intensity in spring. The relationship between total length and body weight, determined to males and to females, resulted: males W = 0.0079 L3.2489 and females W = 0.0168 L2.9872.

Published

2018-07-05

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