ゴマサバの視覚とその釣漁法への応用に関する基礎的研究-4-釣獲時の網膜の順応状態

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The retinae of spotted mackerel angled were observed histologically, and the underwater illumination was measured in the fishing grounds. The retinae of fish angled at 50-70m depthin daytime were light adapted, and illumination intensity at the fishing depth was very much higher than that over which retinal adaptation changes. Hence, the vision of these fish might be completely functional when these were angled. The retinae of fish angled under the fish lamp at night showed variety among the individuals and the retinal regions. The state of retinal adaptation seemed to be independent of the duration of lighting. No light adapted retina was found, though the illumination intensity above the mid-water fishing depth was higher than that over which retinal adaptation changes. Hence, it was concluded that the fish attracted to fish lamp had visual acuity much lower than 0.18 and was probably color-blind.
日本水産學會の論文