研究了河蟹生态育苗池中最常见的糠虾、利氏才女虫幼体 (PLL)、桡足类与河蟹状幼体 (Z)间的关系。结果表明 :糠虾严重影响Z的存活与变态 ,其密度达 3个 /L时可使育苗绝产 ,应彻底杀灭。PLL对Z的危害随其密度的增大而加剧 ,当PLL达 5 0 0个 /L时即严重危害Z1的变态 (变态率为 40 % ,对照组为 80 % ) ;在无轮虫的情况下Z1的变态率更低 (30 % )。Z1可摄食体长小于 0 4mm的PLL ,Z5则完全可以PLL为食而不受其害 ,因此 ,可根据具体条件控制利用PLL。桡足类对Z的影响主要是干扰变态 ,以至引起死亡。当桡足类密度达 5 0 0个 /L时 ,Z1的变态率仅为 2 5 % ,因桡足类是Z4 、Z5的饵料生物 ,育苗初期 (Z1～Z2 )要控制其密度 (<1 0 0个 /L) The relationship between the most common mosquito, shrimp larvae and copepods in the ecological nursery pond was studied. The results showed that the muskmelon seriously affected the survival and metamorphosis of Z, and its density of 3 plants / L could make the plantlets be absolutely dead and should be completely killed. The harm of PLL to Z is aggravated by the increase of its density. When the PLL reaches 500 units / L, the metamorphosis of Z1 is severely endangered (the metamorphosis rate is 40% and that of the control group is 80%); in the case of rotifer Lower Z1 metamorphosis rate is lower (30%). Z1 can take PLLs with body lengths less than 0 4mm, while Z5s can eat completely without being affected by PLLs. Therefore, PLLs can be controlled according to specific conditions. The impact of copepods on Z is mainly disturbing metamorphosis, causing death. When the density of copepods reached 500 cells / L, the metamorphosis rate of Z1 was only 25%. Because copepods were the food organisms of Z4 and Z5, their density (<1 0 0 / L)