60cmボンゴネットにおけるカタクチイワシ仔魚の網口通過率の推定

概要

論文の詳細を見る
A comparative capture experiment of anchovy larvae Engrauris japonicus was carried out with a 60cm-BONGO net (0.15mm mesh width) towed at 2 different speeds of 56 and 136cm/s. A total of 12 tows was alternately repeated in the same area for about 4h. Catches of anchovy eggs were not significantly different, but catches of anchovy larvae were different between the tows at 2 different speeds. For the larvae less than 3.5mm in total length, catches at the low speed were more than those at the high speed. On the other hand, for the larvae larger than 3.5mm in total length, catches at the high speed were more than those at the low speed. The capture probablity was estimated from the catch data obtained in the comparative experiment, using a geometric model involving alarm distance and larval swimming speed. The probability thus estimated decreases with the increasing length of larvae and decreasing towing speed of the net.
日本水産學會の論文