Development of Visual Acuity in the Larval Medaka, Oryzias latipes(COMMUNICATION)(Physiology)

概要

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Development of visual acuity and change in the number of cones in the retina were investigated in the larval and adult medaka (0-210 days after hatching). The optokinetic responses of the fish to black and white vertical striped patterns, which rotated around the experimental vessel, were monitored. The visual acuity, examined behaviorally by elicitation of these optokinetic responses, improved drastically during the first 2 weeks after hatching; subsequent improvement was slower. On the other hand, the number of cones per degree in the retinal field increased continuously as the fish grew. These data indicate that from about the 14th day after hatching to the adult stage, the number of cones per degree enhances the visual acuity. But during the first 2 weeks after hatching, there are other effects as well as the number of cones which promote the fast development of the visual acuity.
社団法人日本動物学会の論文
1985-02-15