The effect of photoperiod on plasma levels of melanin-concentrating hormone in the trout.

Abstract

The neurohypophysial melanin-concentrating hormone, MCH, plays a role in adaptive colour change in teleost fishes inducing pallor when the fish is placed in pale-coloured surroundings. The present study shows that its plasma concentration, measured in groups of white-adapted fish, is not uniformly high throughout the day but follows a clear diurnal pattern… (More)

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