EFFECT OF ESCAPE VENT ON CATCHABILITY AND SELECTIVITY OF POT FOR BLACK DAMSEL (Neoglyphidodon melas)

Abstract

The objective of this study was to investigate the effect of escape vent on catch of black damsel, then size
selectivity of escape vent will be estimated to predict the retention probability of escape vent on black damsel.
The result of this study indicated that comparison of diversity index between the catches of escape vent pots
and non escape vent pots were 3.07 and 3.38 respectively. Installing escape vent pots significantly impove
catch of commercial size black damsel i.e 56.6% of total catch. A Kolmogorov-Smirnov two sample test
indicated that there is significant difference on the length distribution of black damsel between escape vent
pots and unvented pots. The result of size selectivity curve indicated that fish size smaller than 8 cm length
have high probability to escape from escape vent pots. Length at 50 % retention occurs at fish length of 14.
67 mm.