機船底曳網の漁具と漁獲性能に関する研究-1-ベーリング海漁場における機船底曳網の比較について

概要

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The fishing gear used in the Bering Sea in 1963 by the subsidiary trawlers belonging to the factory ship, namely, the Danish seine trawl net (the eastern net) and the two-boat type trawl net (the western net) were studied comparatively on the following items: the height of net-mouth, the sweeping area of towing-rope, the filtering capacity of towing-net, in relation to the fishing efficiencies of the net. The results obtained are as follows: 1) By the radar measurements, it was ascertained that the sweeping area of towing-rope belonging to the western net was wider than that of the eastern net; the ratio being about 1.4. 2) According to the results obtained by the model experiments executed at the circulation tank, the height of net-mouth of the western net was larger than that of the eastern net; the difference was about 0.6-2.Om in the full scaled net. The filtering capacity of towing-net of the western net was larger than that of the eastern net; the ratio being about 8.9. 3) Judging from the catch per one set of towing-net, it was assumed that the catch of the western net was bigger than that of the eastern net, which was coincided with the contents of the above mentioned datas, but counting on the catch record in a unit sweeping area of towing-rope and in a unit filtering capacity of towing-net, it was ascertained that concerning the fishing efficiency the eastern net is superior to the western net.
社団法人日本水産学会の論文