Seasonal effects on some serum and muscle enzymes of catfish (Ictalurus melas) and common carp (Cyprinus carpio)

Abstract

Summary Serum and muscle activities of enzymes (LDH, ALD, CK and ICDH) in intensively farmed catfish (Ictalurus melas) and common carp (Cyprinus carpio) were determined bimonthly between July 1 and November 2. Catfish serum enzymes showed no significant differences under different environmental conditions (exception = CK; values increased slighfly in the last sample). In carp serum, a remarkable increase of LDH and ALD occurred during the cold season. Muscle enzyme activity decreased in both species with decreasing water temperature and reduced metabolic activity.