沿岸底延繩漁業における浸漬時間と釣獲率

概要

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An experimental fishing was conducted at Sagami Bay in 1977, to study the catching mechanism of a bottom long-line. Twelve experiments were made, each having a different immersion time of the gear, and the relationships between the catch and immersion time were deternined. During the short period of time that followed the setting of the long-line, the quantity of demersal fish caught was large, but this started to change after approximately two hours and a steady decline was noted. This shows that the catch would not be expected to increase in proportion to the immersion time, beyond the feeding period of the fish. Escape, dislodgement from the hooks and attack by predators are factors that should be taken into consideration, if the long-line is allowed to stand in the water for a long period of time.
公益社団法人日本水産学会の論文