拉萨裸裂尻鱼规模化人工繁殖技术研究

Study on Large Scale Artificial Propagation of Schizopygopsis younghusbandi Regan

为探索拉萨裸裂尻鱼人工规模化繁殖技术,于2021年3月获得8批拉萨裸裂尻鱼亲本,统计亲本体长、体重及繁殖力;再采用DOM和LHRH-A2组合对拉萨裸裂尻鱼进行人工催产,统计催产率、效应时间、产卵量、受精率和孵化率。结果表明:52尾亲本体长(37.97±2.01)cm,体重(764.38±113.79)g,绝对繁殖力(21667±2864)粒,相对繁殖力(45.56±11.67)粒/g;随着体长、体重增加,拉萨裸裂尻鱼绝对繁殖力呈线性增加,相对繁殖力呈线性降低。测量356尾拉萨裸裂尻鱼,体长(34~38)cm占比最高,为68.28%,体重(500~800)g占比最高,为72.47%;各体长及体重百分比呈正态分布。人工催产8批拉萨裸裂尻鱼雌鱼,共计522尾,总催产率92.27%,催产效应时间为(48~72)h;雄鱼催产效应时间为(24~72)h,催产率为100%。8批卵累计634.2万粒,平均受精率90.57%,平均孵化率70.30%。因此,采用DOM和LHRH-A2组合对拉萨裸裂尻鱼进行催产,可获得较好的催产率、受精率和孵化率。

In order to explore artificial large-scale propagation technology of Schizopygopsis younghusbandi Regan,8 batches of parents of Schizopygopsis younghusbandi Regan were obtained in March 2021 and parental length,weight and fecundity were measured.Then DOM and LHRH-A2 were used for artificial oxytocin of Psilopygopsis lassa,and the oxytocic rate,effect time,oviposition,fertilization rate and hatching rate were counted.The results showed that the body length of 52 experimental fish was(37.97±2.01)cm,the body weight was(764.38±113.79)g,the absolute fecundity was(21667±2864)grains,and the relative fecundity was(45.56±11.67)grains per gram.With the increase of body length and weight,the absolute fecundity increased linearly and the relative fecundity decreased linearly.Among 356 fishes measured,the highest proportion of body length was(34-38)cm(68.28%)and that of body weight was(500-800)g(72.47%).The percentage of body length and body weight were normal distribution.There are 8 batches of 522 females of Schizopygopsis younghusbandi Regan,and the total rate of labor induction was 92.27%.The time of oxytocin effect was 48-72 hour,accounting for 70%in 48 h and 30%in 72 hour.The time of inducing labor of male fish of Schizopygopsis younghusbandi Regan was 24-72 hour,and the rate of inducing labor was 100%.The total number of eggs in 8 batches was 6.342 million,with an average fertilization rate of 90.57%and an average hatching rate of 70.30%.Therefore,the combination of DOM and LHRH-A2 to induce the production of Schizopygopsis younghusbandi Regan could result in better induced rate,fertilization rate and hatching rate.