沿岸底延縄漁業における魚種間の釣獲競合〔沿岸底延縄漁業の釣獲機構に関する研究-4-〕

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Experimental fishings were conducted at Sagami Bay during 1979-1982, with three kinds of coastal set-line, having variations in gear constructions and operational methods. In the present paper, vertical type of set-line with by-line (Tama-nawa) was mainly used, and the results of operations using common type and float type of set-lines are comparatively discussed in catch comosition. Each type of set-line possesses peculiar characteristics of catch, corresponding to its gear design and fishing method. In relation to the desings of grars, vertical distributions of catch are discussed from the data of hooking ration in each hook arranged vertically in branches, so that the behaviour of demersal fishes toward the baited hooks are estimated in each species. In addition to the results mentioned above, the Similarity Index (Cλ) among fishes are con-sidered on diurnal rhythms and vertical distributions of catch, and the possibility of interspecific competition in the baited hook occupation are discussed among several main species.
日本水産學會の論文