关键词: 史氏鲟, 杂交鲟, 鱼种, 生长特性, Acipenser schrenckii, hybrid sturgeon (A. schrenckii♀×A. baeri♂), juveniles, growth performance

Abstract: The feeding experiments of the juveniles of Acipenser schrenckii and hybrid sturgeon (A. schrenckii♀×A. baeri♂) were conducted in cold spring water conditions. The initial average（mean±SD） body weight of sturgeon( A. schrenckii) and hybrid sturgeon were 2.51±0.57g and 2.16±0.33g respectively, the initial average（mean±SD）total length of the juveniles were 6.55±0.69 cm and 6.11±0.33 cm respectively，and water temperature ranged between 18～22℃. The juveniles were fed commercial sturgeon feed(CP≥48%). After 70 days of artificial cultivation, the average body weight of A. schrenckii and hybrid sturgeon were found to be 26.19±6.16g and 22.25±5.53g respectively, and average total length of the juveniles were found to be 13.87±0.61cm and 14.17±0.77cm respectively. The specific growth rate(SRG) of body weight was no difference between the two juveniles of sturgeons, and the SRG of total length of juveniles of hybrid sturgeon was higher than that of A. schrenckii; the mean condition factor of hybrid sturgeon after 100 days of age were lower significantly than A. schrenckii (P<0.01). The inflection point of body weight of juveniles of sturgeon( A. schrenckii) and hybrid sturgeon were 66d and 73d respectively, and the point of total length growth of the juveniles were 29d and 32d respectively, those calculated with Bertalanffy non-linear growth model. The inflection point of total length growth appeared before the inflection point of body weight of the sturgeons; the inflection points of body weight and total length growth of the hybrid sturgeon were delayed for 7 days and 3 days than A. schrenckii respectively, and duration of growing rate of the hybrid sturgeon was longer than A. schrenckii.