海産魚類の明・暗環境における向流行動

概要

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The authors demonstrated in the previous study that under bright condition freshwater fishes in the current without visual objects showed a weak upstream movement, whereas under dark condition a vigorous upstream movement was shown. In this study, the upstream reaction of seven marine fishes was examined under bright and dark conditions with a rotating water trough and a straight water trough devoid of visual objects. The results of the experiments are as follows; 1) Under the dark condition (0.01-0.05lux), two species of experimental fish (Parapristipoma trilineatum, Apogon semilineatus), both of which live near reefs showed a strong upstream movement compared with the movement under the bright condition (2.5-90lux). 2) Under the bright and dark conditions, four species (Sardinops melanostictus, Engraulis japonicus, Decapterus maruadsi, Trachurus japonicus) showed an active upstream movement, not related to the level of illumination. 3) Under the dark condition, only one species (Scomber japonicus) showed a weak upstream movement.
日本水産學會の論文