冷泉水养殖条件下的史氏鲟和杂交鲟鱼种的饲养试验

Feeding experiments with the juveniles of sturgeon(Acipenser schrenckii)and hybrid sturgeon(A.schrenckii♀×A.baeri♂) under cold spring water in southeast China

在冷泉水养殖条件下进行史氏鲟和杂交鲟(史氏鲟♀×西伯利亚鲟♂)鱼种的饲养试验,史氏鲟和杂交鲟鱼种的平均体重分别为(2.51±0.57)g和(2.16±0.33)g;平均全长分别为(6.55±0.69)cm和(6.11±0.33)cm;试验期水温为18~22℃。经70 d人工培育,投喂含48%粗蛋白的人工配合饲料,史氏鲟和杂交鲟鱼种的平均体重分别达到(22.25±5.53)g和(26.19±6.16)g,平均全长分别达到(13.87±0.61)cm和(14.17±0.77)cm。杂交鲟鱼种平均体重和平均全长特定生长率均高于史氏鲟。以Bertalanffy非线性生长模型算得的史氏鲟和杂交鲟鱼种体重生长拐点分别为67 d和71 d,全长生长拐点日龄分别为30 d与33 d;全长生长拐点的出现先于体重拐点;杂交鲟鱼种体重和全长生长拐点比史氏鲟鱼种分别推迟4 d和3 d,杂交鲟鱼种全长生长增速持续时间大于史氏鲟鱼种。

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. schrenc kii） and hybrid sturgeon were （2. 51 ±0. 57） g and （2. 16 ±0. 33） g 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 with commercial sturgeon feed （ CP≥48% ） . After 70 d of artificial cultivation, the average body weight of A. schrenckii and hybrid sturgeon were found to be （22. 25 ±5. 53） g and （26. 19 ±6. 16） g respectively, and average total length of the juveniles were found to be （13. 87 ±0. 61） cm and （14. 17 ±0. 77） cm respectively. The specific growth rate （ SRG） of body weight and the SRG of total length of juveniles of hybrid sturgeon were both higher than that of A. schrenckii. The inflection point of body weight of juveniles of sturgeon （ A. schrenckii） and hybrid sturgeon were 67 d and 71 d respectively, and the point of total length growth of the juveniles were 30 d and 33 d respectively, which were 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 4 d and 3 d later than A. schrenckii respectively, and duration of growing rate of the hybrid sturgeon juveniles was longer than that of A. schrenckii.