Research on the fitness between the mesh size and the length of threadfin bream (<i>Nemipterus sp.</i>) in stow net fishery

Abstract

     The study has used 4 different mesh sizes and mesh shapes in codends, catching 40 trial hauls in Nai lagoon to collect data. The fishing process has collected 2,041 individual threadfin bream (Nemipterus sp.) for analysis of fish weight and length, and using Wileman's method of assessing the selective ability to determine selective parameters for threadfin bream.

     The research results show that the fish length with the probability of 50% retained in the codends (L₅₀) of the samples M1, M2, M3 and M4 is respectively 5.02cm, 6.40cm, 6.49cm and 7.80cm. The selection factor (SF) of the diamond mesh is 3.56 and the square mesh is 7.21. The appropriate the mesh size for fishing with L₅₀ is 21mm for both diamond mesh and square mesh.

Key words: Nemipterus sp., stow net fishery, mesh size, fishing gear selectivity.