我国的四大家鱼是属一年一次产卵类型的。在人工培育条件下,会不会改变这一特性?耒阳县水科所技术员、工人在党支部领导下,通过细致的工作,发现草、鲢、鳙鱼在人工强化培育后一年可以两次产卵,并已运用于生产,收到较好效果。在实习中,我们与耒阳县水科所同志们进行了鳊鱼两次催产试验,试验用的亲鱼都是历年催产的老亲鱼。试验亲鱼均用硬蕊铅笔于头部编号。虽然经过两次催产,标号仍可辨认。鳙鱼两次催产试验过程及结果,见表一:从表一可见鳙鱼两次催产是可以获得鱼苗的。下面谈谈催产过程和体会: The four major domestic fish in China are spawning types once a year. Under the condition of artificial cultivation, will this feature be changed? Under the leadership of Party branch, technicians and workers of Leiyang Water Institute, through meticulous work, find that grass, silver carp and bighead carp can grow by one year Spawning times, and has been used in the production, received good results. During the internship, we conducted two oxytocin experiments with comrades from the Suiyang County Water Institute. All the broodstock used in the experiment were old brood fish that had been oxytocated over the years. Test broodstock are used in the head with hard core pencil number. Although twice oxytocin, the label is still identifiable. Catfish two oxytocin test results and the results, see Table 1: visible from Table 1 catfish two oxytocin can obtain fry. Here to talk about the oxytocin process and experience: