Abstract
Optomotor reaction of fish is usually elicited by rotating a scrren with vertical black and white stripes around a cylindrical lucid aquarium. From the present studies using the dace Tribolodon hakonensis it was found that most of the fish showed typical optomotor reactions when they received symmetrical stimuli on each eye from the double screens encircling the inside and outside of fish path. On the other hand, when the screen was set only on one side of the path, they behaved actively to make the receiving stimuli symmetrical, or the reaction was weak compared with the case of the double screens. A similar result was obtained from another experiment with the moving object made of two or three plates which enabled the fish to retain the balance of visual stimuli, but they did not follow the moving object of one plate.
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