Abstract: Juvenile Russian sturgeon Acipenser gueldenstaedti with initial body weight of 29.70 g±1.32 g were reared in nine square concrete ponds(4.4 m×4.4 m×0.6 m)at stocking density of 2.5 kg/m3(80 ind./m2) (SD1),3.6 kg/m3(115 ind./m2)(SD2),and 4.7 kg/m3(150 ind./m2)(SD3)for 90 days with triplication to investigate the influence of stocking density on hormone,physiological and biochemical components of the juvenile. Cortisol levels were shown to be elevated in the Russian sturgeon reared for 50 d in the experimental groups,significantly higher in the fish reared for 90 d in group SD3 than in SD1 group and SD2 group(P＜0.05).The hemoglobin content was found to be significantly and positively correlated with the stocking density(P＜0.05).There were significant differences in leukocyte contents at different stocking densities of Russian sturgeon(P＜0.05),significantly higher white blood cell count in the juvenile Russian sturgeon in group SD3 than those in group SD1 and group SD2(P＜0.05),indicating that the long-term high-density culture of the Russian sturgeon led to physical and pathological damage of the fish by the end of the experiment.The Russian sturgeon juveniles showed a tendency of blood-sugar levels upgrade first then descending,significantly lower in group SD1 than in group SD3 and group SD2(P＜0.05).There were no significant differences in levels of total cholesterol and total protein(P＞0.05).At the end of the experiment,the juveniles had significantly higher blood triglyceride content in group SD3 than the juveniles in group SD1 did(P＜0.05),without significant difference between group SD1 and SD2.The findings indicate that the order of energy utilization in Russian sturgeon was expressed as blood sugar＞serum protein＞blood lipid.
2017, Vol. 32 
