LENGTH SELECTIVITY OF FISH TRAPS FOR PUFF ER

The relation between the construction of the trap for the Puffer fish and the fishing mechanism that it has was investigated. The relative e fficiency of the trap was calculated with both the data of the trap wi dth and the catch of fish. The calculated selectivity of the trap was compared with that estimated by the probability model for the Puffer t rap fishery, taking into account the fish turning motion in a trap ent rance. The obtained length selectivity for the puffer Lagocephalus whe eleri approximately agreed with the theoretical values. The length sel ectivity of the trap of the puffer Lagocephelus gloveri showed higher values than the theoretical values. The selectivity of the trap calcul ated on the probability model seemed to be influenced by the length of the Puffer fish. We confirmed that the fishing mechanism of the trap for the Puffer fish depends on the behaviour of the fish inside of the trap entrance, but the behaviour of the fish seem not to be necessary uniform.