ます網の袋網の色と漁獲との関係-1-色の違いと漁獲との関係
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概要
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Masu-ami is a small but very popular net among trap nets in Japan. The construction of the net is divided into three parts; a lead net, a fence net and bag nets which are attached at three or more places of corners or sides of the fence (Fig. 1). In the present paper the catching efficiency of the bags was studied from the point of view of their colors. Each bag of the aimed net was made from saran twine and their colors were red, yellow, blue, green and light brown of the natural color of the twine. The effect of the position of the bags on the catch was considered by changing the place of them in every 10 to 15 operations. The experimental data were taken from a masu-ami setting on coastal water of Kanazawa Hakkei, Yokohama, during the periods of April to November in 1956. The results obtained are as follows. 1) The species of fishes entered the net are divided into two groups, judging from the catch in each bag; the one has a tendency to select the colors of the bags and the other has no tendency to it. The species belonging to the former are sea bass, Lateolabrax japonicus, black porgy, Sparus awinhonic, flat fishes, conger-eel, Lumpenus anguillaris, hock trout, Hexagrammos actogrammus, squid, Sepiella maindroni, and the species of the latter are gray rock cod, Sebastodes inermis, surf perch, Ditrema temmincki, prawn, Penaeus japonicus, blue crab, Neptunus trituber. 2) Gray rock cod and surf perch which are liable to enter the bag in the daytime have no tendency to select the colored net, on the other hand, the fishes such as squid, flat fishes and black porgy which are liable to enter the bag in the time from dusk till dawn have a tendency to select the colored net. This phenomenon suggests the motion of the fish toward colored net are different by the species. 3) The catches seems to be effected not only by the difference of light intensity in the bags but also the difference of the other factors which are resulted by the colors of the bags, for example, spectral distribution in the bags and so on.
- 社団法人 日本水産学会の論文
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