太湖短吻银鱼移殖滇池试验研究

1979-1985年对移入滇池后的太湖短吻银鱼个体、群体生态和资源变动情况进行了分析,结果表明:滇池全年均具有适合太湖短吻银鱼生长、繁殖的良好理化环境和丰富的饵料基础,因而缩短了它的生长周期和成熟周期.如1979年引进的银鱼,经几个月的生长,当年11月份就达到性成熟,孵出的仔鱼生长到次年8-9月份又成熟产卵,孵出的仔鱼生长到第三年4-5月份又成熟产卵,这样就形成了三个生殖群体,即春群、秋群和冬群,但寿命仍然是一年.因而其种群发展极快,1980-1986年总捕捞量达10000t,最高年产(1984年)达3200t,平均亩产达7.16kg,经济效益明显.

Test study of introducing neosalanx taihuensis chen into dianche lake

The individual ecology and population ecology of Neosalanx taihuensis Chen introduced into Dianche Lake in 1979-1985 as well as resource variation are observed and analyzed. It is believed that the physical and chemical environments and food foundation in Dianche Lake are preferable for growth and reproduction of Neosalanx taihuensis Chen.therefore their periods of growth and sexual mature are shortened .Several months later after its introduction on April 1979 the Neosalanx mdcbed up to its sexual mature on November the same year. The hatching baby fishes began to breed on April-May the third year. In this case, three breeding populations were formed in one year, namely spring population, fall population and winter population, but their life cycle is still within year. It is clear that the population develops, very fast. From 1980 to 1986, the total catching yield amounted to 10 million kg. The highest yield was in 1984 and 1986, respectively, reaching 3 million kg. The annual average is about 100.8/ha.