达氏鳇稚幼鱼生长特性的研究

于2010年7月10日至8月31日,在黑龙江省特产鱼类研究所鲟鳇鱼养殖基地,在水温为16.5～21.0℃的养殖条件下,对全长为（7.60±0.58）cm、体质量为（2.42±0.45）g的43日龄达氏鳇Husodauricus稚鱼进行人工饲养,研究了达氏鳇稚幼鱼的生长特性。结果表明：经过50 d人工饲养,达氏鳇稚幼鱼全长达到（22.16±1.34）cm,体质量达到（38.85±5.23）g;全长与日龄之间呈线性关系,关系式为L=0.289t-4.7875,R2=0.9984,其全长日均增长量为0.278 cm,平均瞬时生长率为5.552%;体质量与日龄呈指数函数关系,关系式为W=0.2808 e0.0554t,R2=0.9644,体质量日均增长量为0.729 g,平均瞬时生长率为2.081%;体质量与全长呈幂函数关系,关系式为W=0.0111L2.6495,R2=0.9978,幂指数小于3,表明达氏鳇稚幼鱼体质量生长慢于全长的生长,属于异速生长类型。

The growth characteristics in juvenile Siberian huso sturgeon Huso dauricus

The 43 day old juvenile Siberian huso sturgeon Huso dauricus with total body length of（7.60±0.58）cm and body weight of（2.42±0.45）g were reared in a aquaculture unit of Endemic Fishes Institute of Heilongjiang Province to evaluate the growth characteristics of the fish at water temperature of 16.5-21.0 ℃ from 10,July of 2010 to 31,August of 2010.The results showed that the juveniles had a mean body weight of（38.85±5.23）g and a mean total body length of（22.16±1.34）cm via 50 day rearing period.There was a linear relationship between the total body length and days old as an equation of L=0.289t-4.7875,R2= 0.9984,and there was a power function relationship：W=0.2808e0.0554t,R2=0.9644,between body weight and days old.The total body length—weight relationship was expressed as W=0.0111L2.6495,R2=0.9978,with a nearly power of 3,indicating that the body weight was related to the cube of the body length and that the growth was isometric juvenile.The total body length was found to be increased at a rate of 0.278 cm on average for the juveniles and the instantaneous growth ratio of 5.552%.The body weight was increased at a rate of 0.729 g on average and the instantaneous growth ratio 2.081% for the juveniles.