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Abstract
The relative amounts of rhodopsin and porphyropsin (visual pigment composition) in rainbow trout are known to be affected by light and temperature. By transferring fish to new photic and thermal environments and sampling at intervals, the dynamics of the changing visual pigment composition were studied. Within 30–50 days of acclimation, visual pigment compositions in different groups subjected to the same treatment converged and stabilized. Groups of fish held under ten different light and temperature regimes for 60 days were then analysed for visual pigment proportions. These “steady-state visual pigment compositions” reflect accurately the effects of light and temperature on the visual pigment composition in rainbow trout.
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