鱼池浮游动物变动规律与鱼产力的关系

在北京双桥鱼场,经三年来研究,鉴定出浮游动物84种,其中轮虫29种。虽然轮虫仅占浮游动物数量的16.87％,但在生物量上,却要占到浮游动物生物量的72.80％,说明轮虫明显地左右着浮游动物生物量的变动。从浮游动物年变动规律分析,一年有1～2次高峰,生物量的高峰多出现在6～7月,占总调查高峰次数的60％。本文还从水质、水温、饵料等因素,分析了对轮虫生物学上的影响,探讨了轮虫和浮游动物生物量之间的相关性,最后对浮游动物等转化鳙鱼鱼产力的估算值与其实际产量进行了比较与分析。

Study on the Relation Between Zooplankton Changing Law and Fish Productivity

Through three-year research work in Beijing Shuang-chiao Fishery, 84species of zooplankton are identified. The number of rotifers among the 29species makes up 16.87 per cent of the total zooplankton, but the biomassof rotifers makes up 72.80 per cent of the total zooplankton biomass. Thisshows that the rotifers obviously influence the changes of zooplankton bio-mass. The analysis on the law of zooplankton annual change shows thatthere exist one or two peaks in a year, which occur in the period of June-July, and make up 60% of the total number of peaks investigated. Thispaper also analyses the effect of water quality and temperature, the baiton rotifer biology, studies the relation between rotifers and zooplankton bio-mass, and finally compares the estimation of the fish productivity of egg-bearing rotifers with real product.