定置網の逆さ網の漁獲に関する研究

概要

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The Sakasa-ami is a kind of Otoshi-ami (Set net), the entrance of net being open offshore, and the leader net (Kaki-ami) placed in the offshore of the main net. To estimate the fish behavior when they encountered the leader net, the catch by Sakasa-ami was compared with that of the ordinary type of Otoshi-ami, one is Naka-ami and the other is Oki-ami which is located offshore of the Sakasa-ami. A common inshore leader net was placed between Naka-ami and Sakasa-ami. The catch data of Autumn season of 1977 and 1979 were analysed, and the results obtained are summarized as follows:1) When Tsubaiso Serbia quinqueradiata, young of yellow tail (less than 20cm in body length) encountered the leader net, they showed a tendency to proceed inshore or offshore, while Fukuragi larger type of same species (20-40cm), had a tendency to proceed offshore.2) Small size of horse mackerel Trachurus japonicus (body length 10cm) showed a tendency to proceed inshore and offshore in the same ratio, but the larger type of same species (15-30 cm) had a tendency to proceed offshore.3) Barracuda Sphyraena Pinguis seemed to proceed inshore when they encountered the leader net.
社団法人日本水産学会の論文