漁網の色に関する研究-I : 魚群の網目通過状況に関する予備実験

概要

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1. As seen from the behaviour of fish schools studied, Trachurus trachurus (LINNÉ), Atherion elymus (J. & S.), and Cyprinus carpio (LINNÉ), the fish barring effect of a colourcd net decreased almost always in the following order: red > yellow > green, while black, gray, and white produced different effects on fishes, if the latter were of different species (Table 2, Fig. 2). 2. The number of fish which passed through the net, red, yollow, or green coloured, respectively, does not vary with the intensity but seems to depend on the wave length of the light reflected by the net (Fig. 4). 3. Fishes behaved differently even to the nets of the same colour if the light source was made different (Table 2). 4. The present results may not, entirely be free from the colour contrast due to the simultaneous use of differently coloured nets.