Gillnet Selectivity and Mesh Size Regulation for Bali Sardine Fishery, (Sardinella lemuru) in Bali Strait

Bali sardine resource in Bali Strait is abundant enough. However overfished of the resource has occured due to excessive exploitation. Objective of this research was to determine the smallest mesh size of gillnet. Two different mesh sizes of the gillnet were used to define gear selectifity, namely 2.54 cm and 3.75 cm. Biological parameters to be examined were total length, body girth, body weight, sex, and gonad maturity. While length of frequency data was analyzed by applying the approach of normal distribution. In addition, the research applied curve selectivity approach to determine the smallest mesh size of fishing gear. Result showed that value selection factor (S) of the gear toward the fish was 5.89. While minimum mesh size of the gear to catch mature fish (Lm ? 17.1 cm) was 2.94 cm. The research reccommended that minimum mesh size of gillnet be at 2.94 cm and size of fish landed be higher than 17.3 cm.