Effect of Soak Time and Type of Trap for Harvesting Blue Swimming Crab (Portunus pelagicus) and Mud Crab (Scylla paramamosain) Reared in Earthen Pond to Productivity Assessment

Abstract

The objectives of this study were to study the soak time (06.00, 12.00 and 18.00) and types (collapsible crab trap, 8-holes collapsible fish or shrimp trap and rectangular trap) of trap on yield evaluation of blue swimming crab (Portunus pelagicus) and mud crab (Scylla paramamosain) cultured in earthen pond. The results showed that trap soak time (collapsible crab trap) were not affect blue swimming crab entranced trap but its affect in mud crab. The mud crab entranced trap at 6:00 am. had higher than at 12.00 am. and 18.00 pm. The results of the trap types showed that, after 1 hour of trap laying, blue swimming crab entranced 8-holes collapsible fish or shrimp trap (7.00±2.00 crabs) had higher than collapsible crab trap (3.33±1.15 crabs) and rectangular trap (0.67±0.57 crabs). In mud crab, entry rates of crab of collapsible crab trap (1.33 ± 0.57 crabs), 8-holes collapsible fish or shrimp trap (1.00±1.00 crab) and rectangular trap (0.00 ± 0.00 crab) were not significantly different. This study indicated that the soak time of trap did not affect yield assessment in blue swimming crabs, but its effect in mud crab reared. In addition, should be appropriately selected trap type especially for evaluating blue swimming crab reared to evaluate the crab productivity.