Abstract
The spectral sensitivity curves have been obtained by means of the L-response of S-potential for the skipjack tuna (Katsuwonus pelamis), and for the frigate mackerel (Auxis thazard). The sensitivity curve is always maximal at 497 nm and, in addition, differed little from the Dartnall's nomogram curve with its λmas at the same position. That this curve might reflect the activity of the one photoreceptor, presumably the cone, in spite of the close agreement with the absorption spectrum of the rod pigment, rhodopsin is dis-cussed in the paper. The results are also explained in terms of light adaptation to the environment where light of shorter wavelengths prevails.
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