Size Selectivity of Square Mesh Cod-end with respect to Stolephorus commersoni (Lacepède, 1803) and white fish, Lactarius lactarius (Bloch and Schneider, 1801) along East coast of India

Abstract

Selectivity of trawl cod-ends square mesh with respect to Stolephorus commersonii and Lactarius lactarius were studied off Visakhapatnam along the east coast of India. Covered cod-end method was applied to assess selectivity parameters. The L25, L50, L75 values for 30 mm cod-end of S. commersonii were 10.56, 11.17 12.98 cm whereas selection range (SR), selection factor (SF) and selection ratio (Sr) were estimated at 2.42, 3.92 and 0.8 respectively. Estimated L25, L50, L75 value for 40 mm trawl cod-end of L. lactarius were 13.23, 14.95 and 16.93 cm whereas selection range (SR), selection factor (SF) and selection ratio (Sr) were 3.69, 3.73 and 0.9 respectively. The retention length for the square mesh cod-end found to be superior compared to conventional diamond mesh cod-end.