(Selective catching of peixe cadela, Cynopotamus humeralis Valenciennes, 1847 (Pices Cypriniformes, by employng monofilament gill-nets).

Abstract

The purpose of this paper is to determine the selectivity curve of gill-nets used to catch "peixe cadela", Cynopotamus humeralis, according to Gulland (1969). The result is:

c*(L)= e^{-0.0762(L í  2.0152 m)2}

Where:

c*(L) = relative frequency of retention

L = total length of the fish

m = internal perimeter of the mesh.

It was also noticed the relationship between total length and body weight, the time of reproduction and the length of first sexual maturation of females.