鲟、鳇鱼人工繁育与杂交技术研究

Studies on Artificial breeding and hybriding of Acipenser schrencki and Huso huso

对达氏鳇、史氏鲟人工繁殖时通过水流刺激 ,在水温 8～ 1 3℃下 ,以DOS (自行研制 )进行 2～ 3次的注射催熟 ,再注射自制的类固醇激素 1 7α-羟基 - 2 0 β双羟基孕酮(以下简称 1 7α- 2 0 βp) ;在水温 1 6～ 1 8℃利用促黄体素释放激素类似物 (LHRH -A) ,诱导达氏鳇、史氏鲟排卵 ,排精。效应时间 8～ 1 8h,获得催产率 1 0 0 %、受精率和杂交受精率 90 %的效果。采用全人工饲料开口试验和苗种培育试验 ,并获得 86 7%开口成活率和 73 4%的苗种成活率。从而达到提高开口率和成活率的目的。观察鲟鳇鱼摄食、生长与形态发育状况。生长曲线表明 :不论是体长还是体重 ,50日龄前增长缓慢 ,50～ 1 0 0日龄则速度增长较快。经 1 0 0d饲养 ,平均体长达 2 8 3cm ,平均体重达 69 7g。

Artificial reproduction of Acipenser sckrencki and Huso huso was undertaken The stock were injected with DOS(self-made) 2-3 times to promote maturation, then injected self-made 17α-hrdroxy-20β-dihydroprogesterone(17α-20βp) at water temperature of 8～13℃ Sturgeon stock were induced to ovulate and discharge sperm by injecting LHRH-A under the temperature of 16～18℃ The effect time was 8～18h The spawning rate, fertilizing rate and cross-fertilizing were 100%, 90% and 90% respectively Another trial was conducted to study feeding effect of start artificial complete feed on sturgeon larvae Survival of larvae to fingerling size and to juvenile size were 86 7% and 73 4% respectively Fish grew slowly within 50 days, but its growth accelerated from then till 100 days old Average body length and average body weight were 28 3 cm and 69 7g respectively at the end of 100 days old