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The study investigated the effects of different dietary lipid sources on the growth performance, carcass composition, and blood parameters of juvenile Chinese sturgeon, Acipenser sinensis. Seven iso-nitrogenous and iso-energetic diets containing different lipid sources were prepared, i.e. fish oil ( FO), soybean oil ( SO), groundnut oil ( GO), rapeseed oil ( RO), corn oil ( CO), pork lard ( PL), or fish oil: pork lard (1 : 1, FPL). Each experimental diet was fed to triplicate treatments of eight Chinese sturgeon juveniles with initial weights of approximately 47.5 g in indoor tanks for 10 weeks. The FO, SO, and CO treatments had significantly higher weight gain and specific growth rates than the other treatments. Muscle lipid content of the FO treatment was significantly higher than that of the PL treatment, but significantly lower than that of the SO treatment (P < 0.05). The PL treatment had the lowest liver lipid content. Plasma cholesterol and triglyceride concentrations in the CO, FO, and SO treatments were significantly lower than those in the GO, PL, and FPL treatments. The activities of alanine aminotransferase and aspartate transaminase in the FO, GO, and CO treatments were lower than those in the SO, PL and FPL treatments (P < 0.05). This study revealed that the use of lipid sources for juvenile A. sinensis can be chosen in the order of FO, followed by CO and SO; GO was the least suitable lipid source for juvenile Chinese sturgeons. [ABSTRACT FROM AUTHOR]

The present study was conducted to investigate the effects of different dietary lipid sources on the growth performance, tissue fatty acid composition and serum lipids indices of juvenile Acipenser schrenckii. Seven experimental diets were formulated with 10% lipid originating from fish oil ( FO), sunflower oil ( SFO), tallow oil ( TO), pork lard ( PL), rapeseed oil ( RO), corn oil ( CO) and soybean oil ( SBO), respectively. Triplicate groups of 20 Amur sturgeon [initial body weight (9.83 ± 0.19) g; means ± SD] were cultured in 405-L flow-through aquaria and assigned to the experimental diets for 8 weeks. Results showed that fish fed the SBO diet had the highest weight gain rate (611.29%), significantly higher than that of fish fed the FO (539.14%), CO (540.56%) or SFO (451.27%, the lowest) diet (P < 0.05). Fish fed the SFO diet also had the lowest values for feed efficiency, which was significantly lower than that in fish fed the other diets (P < 0.05). Significant differences were observed in fatty acids composition in muscle and liver of fish fed different lipid diets (P < 0.05). Ratios of total n-3 polyunsaturated fatty acids in lipid of muscle and liver were highest in fish fed the SBO (10.66 and 5.02%) or FO (9.48 and 5.10%) diet, lowest in fish fed the SFO (4.68 and 1.01%) diet. The ratio of n-3/n-6 in muscle and liver was lowest in fish fed the SFO diet (0.68 and 0.13), and highest in fish fed the FO (2.30 and 0.82) diet. Serum concentrations of total-cholesterol, triglyceride and low-density lipoprotein cholesterol were lowest in fish fed the FO diet. No significant difference was observed in serum high-density lipoprotein cholesterol content among all groups (P > 0.05). Fish fed the PL diet had the highest moisture and lipid contents in muscle, while fish fed the TO diet had the highest protein content in muscle. In summary, the lipid sources used in this test (excepting SFO) can be deemed as suitable for Amur sturgeon, the effect of SBO being the best. SFO is not recommended as a supplement in the Amur sturgeon diet. [ABSTRACT FROM AUTHOR]