暗順応魚の形態視におよぼす全般光と局部光の影響

概要

論文の詳細を見る
To obtain some fundamental knowledge regarding the vision of fishes attracted to a fish lamp, the retinomotor response and the effect of general and local lighting on the shape discrimination of dark adapted bluegil sunfish Lepomis machrochirus were examined in a tank. Histological observations showed that 10 minutes after the onset of general lighting the retina was still dark adapted. A remarkable change in the thickness of pigment and cones took place between 10 and 15 minutes, but the retina was not light adapted within this period. The dark adapted fish which was pretrained to discriminate shapes, discriminated the shapes successively displayed within 7 minutes and the shapes simultaneously displayed within 9 minutes. The dark adapted fish did not respond to the shapes and retreated from the discrimination point when the fish's head was illuminated with local light. From the results obtained, it is presumed that while the fishes attracted to the fish lamp can recognize to some extent the shape of fishing gear even if their retian is not light adapted histologically, the effect of the lamp on the vision of fish is extremely harmmful when the lamp is close to fish's visual direction.
日本水産學會の論文