漁網の色に関する研究-III : 網地の色彩の濃淡が魚群の行動に及ぼす影響について

概要

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1) As for the behaviour of a fish school (Salmo gairdnerii irideus (GIBBONS) ) approaching the nets with a colour of the same stamp but of different depth, no difference was detected between the kinds of colour examined, i.e., blue or green, red, and brown. The manner in which the depth of colour of a net affects the behaviour of a fish school was by no means of the same trend independent of the kind of colour of the net. 2) Like the previous experiment, also the present experiment manifests that, while it is quite light in the day time, the behaviour of fish school near a coloured net is influenced more strongly by wave length than by intensity of the light reflected by net cords. 3) From the bservations on the behaviour of fishes schooling near ?? a net of no particular colouration, it was found that a black net was least effective in fish stopping action.