1. Guangxi Colleges and Universities Key Laboratory of Utilization of Microbial and Botanical Resources, Guangxi Laboratory of Polysaccharide Materials and Modification, School of Biotechnology and Marine Science, Guangxi Minzu University, Nanning 530006,China; 2. Guangxi Institute of Oceanology Co., Ltd., Guangxi Marine Culture New Species Breeding Research Centre, Beihai 536000, China
Abstract：Feeding rate is one of the important factors affecting the growth of fish. In an appropriate range, the growth performance of fish is enhanced with the increase in feeding rate. This trial was conducted to investigate the effects of different dietary feeding rates on the growth performance, body composition, liver digestive enzyme activities and immune enzyme activities of juvenile grey mullet Mugil cephalus. The test subjects selected 240 healthy juvenile mullet with an average body weight of (37.96±0.89) g, and were randomly divided them into 4 groups, each group consisting of 3 replicates and 20 replicates each. Four groups of mullet juveniles were reared at feeding rate of hunger, half satiation, full satiation, and over satiation (2.5%, 5%, 10%, and 15% of body weight) for 8 weeks. The results showed that different feeding rates had significant effects on weight gain rate (WGR), specific growth rate (SGR), feed conversion efficiency (FCR), condition factor, hepatosomatic index, moisture, crude protein content, crude fat content, liver protease activity, lipase activity, catalase activity (CAT), superoxide dismutase activity (SOD), and lysozyme (LZM) activity (P＜0.05). No significant differences were observed in survival rate (SR), viscero somatic index,ash content and liver amylases activity (P>0.05). With the increasing feeding rate, mullet WGR, SGR, condition factor, hepatosomatic index,crude fat content, liver protease activity, lipase activity, CAT activity, and LZM activity were firstly increased and then tended to be stable. When the feeding rate increased from 5% to 15%, mullet FCR, moisture and crude protein content showed a downward trend (P<0.05). Both mullet liver lipase and SOD activities were firstly increased and then decreased with the increase in dietary feeding rate, with the maximum value at the dietary feeding rate of 10%. According to the analysis mullet growth performance, body nutrition content, liver digestive enzyme activity and immune enzyme activity, the optimal dietary feeding rate was 10% for mullet.
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2022, Vol. 41 
