曳網の中に於ける魚群の活動
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概要
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The behaviour of fishes driven by a drag-net or besieged in it was studied experimentally. By means of the model of drag-nets, the mesh of which is so large as the fishes, Hprocheilus latipes (T. et SCHL.), can pass through and whicl moves automatically along a long tank (see Fig. 1). According to Exp. 1 and 3, the fishes, majority of them, dont pss through the moving net, so far as the nets velocity is of a range, 0.20-0.06 Meter/second. Exp. 2 indicates that they besiged in the wing of a drag-net dont fall into the bag. The results have been summarized in Table 1-8. It is suggested through another result obtained by an out-door experiment, which was carried out on the fishing-action of an small drag-net used to catch young fishes in the shallow water, that the knowledge obtained by the laboratory experiment is applicable to practical works.
- 公益社団法人 日本水産学会の論文