Abstract
The spectral sensitivity of chum Oncorhynchus keta, pink Oncorhynchus gorbuscha and masu Oncorhynchus masou masou salmon was measured by the optomotor reaction index in monochromatic light of 400, 440, 480, 520, 560, 600 and 620 nm using an interference filter. The reaction rate of chum salmon was highest at 520 nm but the rates of pink and masu salmon were highest at 560 nm. In addition, a high reaction rate at 400 nm was also observed in masu salmon, suggesting that masu salmon are sensitive to ultraviolet light.
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