minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae 同义词：daphnia,
minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms 同义词：cyclops,
例句与用法
1.
Walter jumps all over the place like a water flea . 瓦尔特跳来跳去，活象个水蚤。
2.
Culture method of water flea 微尘子养殖法
3.
Acute toxicities of two organphosphorous pesticides to water fleas moina mongolica 敌百虫和久效磷农药对蒙古裸腹?的急性毒性研究
4.
The nontoxic m . aeruginosa , however , had no negative effects on the growth of the water fleas 无毒微囊藻虽然不影响虫体的生存，但影响其怀卵量和幼体产出。
5.
Water fleas daphnia magna was fed both toxic alga microcystis aeruginosa ds and nontoxic alga m . aerztginosa 573 for 7 ~ 14 days under laboratory condition 摘要用铜绿微囊藻有毒株ds和无毒株573喂养大型? ，观察微囊藻对虫体的生长和繁殖的影响。
6.
The results showed that toxic m . aeruginosa delayed the growth and reproduction of the water fleas because the algae hindered reproduction of the water fleas 试验结果表明，有毒的微囊藻不仅明显延缓大型?的生长，而且阻碍虫体的怀卵和发育，并造成幼体产出困难、导致大型?死亡率升高。
7.
In this paper two - generation reproduction toxicity of fenvalerate , a - cypermethrin , chlorpyrifos , and triazophos was tested in a 21d period with water flea , daphnia magna , . the toxicity indicator included longevity , body length , days to first brood , days to first pregnancy , number of youth per female , intrinsic rate of natural increase ( r ) , and number of broods per female . accordingly , the dose - response relations and relations between the chronic responses and enzyme levels were investigated 为了确定水蚤体内生化指标与慢性毒害效应之间的关系，特别是在低浓度暴露状态下生化指标改变的生物学意义，以便能更准确预测早期农药对水蚤种群的潜在危害，本文以浙江省常用杀虫剂氰戊菊酯、高效氯氰菊酯、三唑磷和毒死蜱进行了大型蚤( d . magna )的急性和慢性毒性试验(包括子代水蚤的恢复试验) 。
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