Recovery level of metabolic enzymes in juvenile black sea bream (Sparus macrocephlus) after exhaustive exercise

Taking black sea bream (Sparus macrocephlus) as object, we investigated its recovery level of immune and metabolic enzymes in serum after exhaustive exercise. Results show significant change in the LD and GLU concentrations as well as the activities of AST, ALT, SDH, LDH, PK and HK for juvenile black sea bream (length of 8.9−9.9 cm) with different recovery time after exhaustive exercise (P<0.01). At 0^th hour after exhaustive exercise, the activities of LD, GLU, AST, ALT, SDH, LDH, PK and HK increased significantly (P<0.05). At 4^th hour after exhaustive exercise, the LD concentration in the serum almost recovered to the control group's level (P>0.05). At 16^th hour, the activities of SDH, HK, PK and AST recovered to the control group's level (P>0.05) while the GLU concentration and ALT activity were still lower than the control group's level (P<0.05). It is revealed that exhaustive exercise enhanced the oxidation resistance and aerobic metabolism of juvenile black sea bream within 4-hour stress response of post-exercise, and the fish could do exhaustive exercise again after 4 h, but the blood glucose test shows that the anaerobic metabolism tolerance decreased thereafter.