Abstract
To obtain a fundamental knowledge regarding the vision of fishes attracted to fish lamp, the retinomotor response and change in shape discrimination during light adaptation of the Japanese parrotfish Oplegnathus fasciatus (TEMMINCK and SCHLEGEL) were examined. The histological observation showed that the retina at five minutes after the onset of light was still dark adapted and remarkable change in the thickness of pigment and cones took place between 5 and 10 minutes, but the retina was not light adapted at this time. The fish which was pretrained to discriminate shapes displayed in a tank, discriminated the simplest shape within 5 minutes and all other shapes used in the experiment within 10 minutes after the onset of light. From the results obtained, it is presumed that fishes attracted to fish lamp can recognize to a great extent the shape of fishing gear because of a possible neural adaptation mechanism even if their retina is not light adapted histologically.
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