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Profile of melatonin production and receptor distribution

Melatonin (Mel) was significantly higher at night than during the day in adult fish in Spring and Autumn. Mel concentrations in juvenile fish were also significantly higher than those in adult fish. Mel contents in the tissues, i.e. small intestine, gill and kidney at 11:00 h and 23:00 h showed no significant day-night differences in melatonin concentrations and was highest in intestine. There were no daily variations in the Kd and Bmax for high affinity melatonin binding sites in different tissues. These results provide the basic information for manipulations which may be dependent on the daily light-dark cycle.

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Institute of Oceanology of Polish Academy of Sciences
Powstancow Warszawy 55 Str.
81-712 SOPOT
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