ゴマサバの視覚とその釣漁法への応用に関する基礎的研究-7-集魚灯下の魚群運動の魚探機による観察

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Movement of the spotted mackerel attracted to the fish lamp was observed by the use of fish finder in the fishing grounds off Yaku Island and off the mouth of Kagoshima Bay. During fishing, the fish echoes repeated the alternate appearance and disappearance, and an echo shifted its vertical position on arecording paper. These echo-traces were considered to show well the three dimensional movements of fish school. Hence, it was concluded that the spotted mackerel attracted to fish lamp, forming a school, move actively in a relatively wlde area beneath the fish lamp and its surroundings. From an echo-trace that showed a typical vertical movement of a school, the velocity of the movement was estimated at about 40m/min.
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