湖北省水库与湖泊银鱼移植与增殖试验

在受试水库、湖泊中,移植与增殖二种银鱼,即近太湖新银鱼和太湖新银鱼。经三种人工采卵受精技术的比较试验,采用半干法人工受精最为理想。经多种受精卵运输方法的比较试验,采用塑料袋充氧运输最为理想。经散撒受精卵和网箱孵化的比较实验,采用网箱孵化最为理想。经不同放流鱼苗技术的比较实验,采用鱼苗平游后放流最为理想。经不同季节、不同开捕时间的比较实验,二种银鱼的合理捕捞时间为秋冬季,严禁在春季捕捞;最合理的开捕时间为国庆节前后。近太湖新银鱼和太湖新银鱼的人工采卵授精时间为3月上旬和4月上旬,严禁在非繁殖盛期采卵。银鱼的捕捞强度应控制在资源量的2/3或3/4范围内。

Study on the Transplantation and Multiplication of Icefishes in Reservoirs and Lakes, Hubei Province

Two kinds of icefishes were widely transplanted and multiplicated the reservoirs and lakes in Hubei Province, China. They were Neosalanx pseudotaihuensis and N. taihuensis. By comparative test on three techniques of artificial picking off eggs and insemination, it was indicated harf dry way was the best. Comparing several approach to transporting fertilized eggs, plastic bag with oxygen was ideal. Comparing broadcasting fertilized eggs and hatching them in webcase, the latter was better. Comparing different techniques of exiling fry, doing that after it could move parallelly was the best. Comparing the different fishing seasons and first catching time, the appropriate fishing seasons was autumn and winter, the best first catching time was around Nationl Day. For N. pseudotaihuensis and N taihuensis, they could pick off eggs and inseminate artificially during the first ten days of March and April. The catching intensity should be limited within two thirds or three forths of the stock biomass.