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The Effects of Composite Enzymes in Diets on Growth, Carcass Composition and Specific Enzyme Activities of Juvenile Paralichthys lethostigma

The study was conducted to investigate the effects of commercial composite enzymes (CE) on growth, carcass composition and specific enzyme activities of juvenile flounder Paralichthys lethostigma. Four diets were formulated: one diet contained no CE (the control), the three others provided graded levels of CE (0.5%, 1% and 1.5%). Each diet was fed to pentaplicate of flounder juveniles for 28 days in aquaria (50×40×30 cm, water volume 50 L). The growth parameters (final wet weight, specific growth rate: SGR, feed conversion rate: FCR and apparent digestibility: AD) were significantly affected (P0.05). The CE had significant effects (P<0.05) on the specific activities of neural protease, alkine protease and amylase, but not on acid protease, amimopeptidase and alkine phosphatase. The pattern of the specific activities of neural protease, alkine protease and amylase was similar to that of SGR with fish fed diets containing 1.5% of CE exhibited the significantly higher activities (P<0.05). The results demonstrated that the supplement of CE in diets could significantly improve growth performance and digestive enzyme activities of flounder juveniles.