is one of the most important aquaculture species in the world, cultured in a cage culture system, which was introduced to China in 2010 and in recirculating aquaculture system (RAS). In order to investigate the effects of dietary fat and protein levels on fat metabolic enzymes and growth associated gene expression of in RAS, a 3×2 (three fat levels:18%, 21%, and 24%; two protein levels:38% and 48%, represented by F₁8, F21, F24, P38, and P48, respectively) random two-factor animal trial was conducted for 56 days. The trial included six treatments with triplicate groups of 40 trial fishes (650.00±45.50) g. Results showed that:(1) The fat requirement of was lower in RAS than in cage culture system, and the requirement of protein was equal between the two systems. The weight gain rate (WGR) was significantly higher in P48F21, by 22.23%-125.86%, than that in other groups (<0.05), while the feed conversion rate (FCR) was significantly lower in P48F24, by 16.24%-30.00% than that in other groups (<0.05). (2) High fat level significantly increased hepatosomatic index (HSI) (<0.05), while high protein level decreased condition factor (CF) very significantly (<0.01). The HSI was significantly higher in P48F24 group than in other groups, by 10.92%-28.16% (<0.05), while the CF was significantly lower than that in other groups, by 10.24%-12.31%. The study proposed the primary nutrition project that can control the shape of to 600-900 g by weight. (3) High and medium fat levels significantly (<0.05) increased the activity of lipoprotein lipase (LPL), hepatic lipase (HL), and total esterase, while high protein level significantly (<0.05) increased the activity of LPL and total esterase. The activities of LPL, HL, and total esterase in P48F21 and P48F24 groups were significantly higher than those in other groups (<0.05), and especially the activity of LPL in the two groups was higher than that in the P38F₁8 group, in which the activity of LPL was the lowest (<0.05). We also found a significant negative correlation between protein level and the activity of fatty acid synthase (FAS) (<0.05). (4) Medium fat level increased the expression of IGF-I gene in muscle and liver extremely significantly (<0.01), while high protein level increased the expression of GH and IGF-I genes in muscle and IGF-I gene in liver extremely significantly (<0.01). The expression of GHR decreased significantly with the increase in fat or protein level (<0.05). The expressions of GH and IGF-I genes in muscle and IGF-I gene in liver in P48F21 and P48F24 groups were significantly higher than those in other groups (<0.05), while the expression of GHR in muscle and liver was lower than that in other groups (<0.05). We found negative correlations among GH, IGF-I, and GHR, which could control the growth and reproductive activities in appropriate ranges. In conclusion, P48F21 and P48F24 groups had obvious promoting effects on growth performance and growth-associated gene expression in , while P48F21 group was better in the use of fat and saving of costs.