北洋鮭鱒流剌網の色彩に関する基礎的一実験

概要

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The behaviours of a rainbow trout school in the neighbourhood of experimental net was observed, leading to a conclusion summarized as follows: 1) The colours of net examined were blue-green (mizu-iro), cutch-brown (katti-iro), and gray (usuzumi-iro). Offensive effect of these colours upon the fish passage increased in the daytime in the order: blue-green<gray<cutch-brown (Tables 1, 2). 2) Another order prevailed in the twilight hour: gray<blue green<cutch-brown. This suggests that also the weather makes an influential factor (Table 3). 3) As to the colour of net there holds in the twilight some parallelism between the visibility of a net to human eye and the tendency of fish entanglement in that net (Table 3). From these results it may be presumed that as a salmon net operated usually all night cutch-brown net will not efficiently catch the fish.
社団法人日本水産学会の論文