摘要
试验是用8个容积3立方米的水泥池和10个网箱进行的。一组池塘加水库底泥,一组只加库水,池塘和网箱都用空池、空箱对照,分别放入不同密度的鲢鳙鱼(2:1),经2天放养。放养期间测定了许多水化学、浮游生物的生物量和浮游植物的初级产量以及鱼的生长。发现随着鱼密度的增加,试验池和网箱内浮游植物的生物量和生产量增加,而个体小型化,易消化种类减少,浮游动物则随鱼的密度增加而减少,鱼对浮游植物的利用率及鱼的生产量和浮游植物生产量之比随放鱼密度的增加而降低。
This study was conducted in ten net cages located in the reservoir and in eight concrete 3-M3 ponds divided into two groups. one with mud from the reservoir and the other without any mud for 20 days. Silver carp and bighead carp fingerlings (2:1) were stocked into the test ponds and the net cages at different density, and the ponds and the cages without fish were used as the control treatment. Contents of various chemicals in the water were analysed and the plankton biomass, primary production from phytoplankton and the fish increments were estimated during the experiments. The results revealed that the biomass and the production of phytoplankton in the water in the test ponds and the net cages increased with the increase in the stocking density of fish, whereas the sizes and the numbers of the digestible species of phytoplankton in the ponds and the net cages decreased. For zooplankton, its biomass and production decreased as the stocking density of the fish increased. The utilization rates of phytoplankton by the fish and the ratio of fish production to phytoplankton production were reduced with the increase in stock -ing density. This suggests that stocking silver carp and bighead carp facilitates eutrophication in shallow waters.
出处
《大连水产学院学报》
CSCD
1989年第3期11-24,共14页
Journal of Dalian Fisheries University
