Selective catching of "Viuvinha" Moenkhausia intermedia Eigenmann, 1908 (Characiformes, Characidae), by employng monofilament Gill-nets, in Ibitinga Reservoir, Tietê River, São Paulo State, Brazil

Authors

  • Elmar Cardozo CAMPOS Pesquisador Cientí­­fico- Seção de Controle e Orientação de Pesca - Divisão de Pesca Interior -Instituto de Pesca - CPA/SAA
  • Ricardo Amaro dos SANTOS Pesquisador Cientí­­fico- Seção de Controle e Orientação de Pesca - Divisão de Pesca Interior -Instituto de Pesca - CPA/SAA
  • Jaime José Casari da CAMARA Pesquisador Cientí­­fico- Seção de Controle e Orientação de Pesca - Divisão de Pesca Interior -Instituto de Pesca - CPA/SAA
  • José MANDELLI JUNIOR Pesquisador Cientí­­fico- Seção de Controle e Orientação de Pesca - Divisão de Pesca Interior -Instituto de Pesca - CPA/SAA

Keywords:

Viuvinha, Moenkhausia intermedia, gill-nets, selectivity curve, interval of selection, weight/length relation, Ibitinga Reservoir

Abstract

It was determined the mean selectivity curve of gill-nets utilized in the catching of the fresh-water fish "viuvinha", Moenkhausia intermedia Eigenmann, 1908, in Ibitinga Reservoir, Tietê River, São Paulo State, Brazil, through the model proposed by GULLAND ( 1971). The observed results are:

c* (L) = e -1.06 (L -1.55 m)2

where:

c* (L) =relative frequency of retention

L = total length of the fish

m = internal perimeter of the mesh

The interval of selection for different mesh sizes

(m) is given by:

Lm= í  0.81(cm) and LM= + 0.81 (cm)

Total length relationships both to body weight and internal perimeter of mesh were also determined. The females body length in the first sexual maturation period was done by Lpm = 8.50 cm. Since the females body length in the first sexual maturation is known in the reservoir, gill-nets with internal perimeter major than 5.00 cm are recommended.

Published

2018-09-09

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