Abstract: The present experiment was conducted to determine the dietary vitamin A requirement of juvenile Amur sturgeon(Acipenser schrenckii) by formulating seven semipurified diets containing 10, 258, 510, 1050, 2020, 4100 and 8300 IU vitamin A (as retinol acetate) kg)1 diet, respectively. Each experimental diet was fed to triplicate groups of 20 juveniles each with initial average weights of 12.09 ± 0.22 g in 405-L aquaria and maintained at 25.0 ± 2.0 C for 8 weeks. Fish fed the basal diet (10 IU vitamin A kg)1 diet) exhibited poor appetite and activity, whereas these signs were not observed in any group fed vitamin A-supplemented diets. Weight gain, feed efficiencyand hepatosomatic index increased significantly with increases in the dietary vitamin A level, reaching a peak with the vitamin A 1050 IU kg)1 diet, and then decreasing. Muscle chemical compositions were not affected by the dietary vitamin A levels. Vitamin A concentrations in liver and muscle increased significantly as the vitamin A levels increased within a range of 10 4100 IU kg)1 diet; above this level there were no significant changes. Broken-line regression analysis of weight gain and liver vitamin A concentration against the dietary vitamin A level showed that juvenile Amur sturgeon required a minimum of 923 IU vitamin A kg)1 in the diet for maximal
growth, and 1981 IU kg)1 for highest liver vitamin A accumulation.

附件下载：H.Wen, A.S.Yan, Q.Gao, et al. Dietary vitamin A requirement of juvenile Amur sturgeon (Acipenser schrenckii). J.Appl. Ichthyol. 2008, 24: 534-538. pdf