水中灯下での魚類の集合・離散過程

概要

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In order to investigate the periodicity of the appearance and disappearance of fish at-tracted around an underwater lamp, the change of volume of fish in the illuminated area was measured by using scanning sonar and fish finder. The biggest volume was recorded between 2 and 3 o'clock. After that, the volume showed a decreasing tendency at astronomical twilight time before sunrise regardless of the low light intensity (10-2-10-3lx). The authors think that the preparation of the fish to adapt to light stimulation in that time, when the retinal rhythm of fish shows a distribution intermediate between dark- and light-adaptation, caused the approach to the underwater lamp by the fish. The time (astronomical twilight time) of disappearance of fish from the lamp suggests the threshold for retina in the fish attracted around the underwater lamp.
日本水産學會の論文