Synopsis
Changes in scotopic visual sensitivity of rainbow trout,Salmo gairdneri, were induced by thyroxine and/or temperature treatments. The spectral sensitivities of these fish were correlated directly with changes in the absorption spectrum of a mixture of the two rod visual pigments, rhodopsin and porphyropsin. In contrast to earlier reports, these data for trout are more consistent with the hypothesis that labile binary visual pigment mixtures are useful in making short- or long-term adjustments for vision in a variable photic environment.
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Allen, D.M., Munz, F.W. Visual pigment mixtures and scotopic spectral sensitivity in rainbow trout. Environ Biol Fish 8, 185–190 (1983). https://doi.org/10.1007/BF00001084
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DOI: https://doi.org/10.1007/BF00001084