Abstract
The dependence of the effects of serotonin and cholecystokinin on the activity of peptidases and glycosidases in the intestine of the carp Cyprinus carpio from the content of zinc and copper ions in different photoperiods (6: 18 and 0: 24 h) was studied. It was shown that the activity of enzymes in the intestine of fish under the influence of both hormones in conditions of light deprivation significantly increases, especially under the action of copper. The mechanisms of the influence of these factors on the activity of peptidases and glycosidases of fish intestines are discussed.
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