聚缩虫(zoothamnium)属原生动物门、纤毛虫纲、缘毛目、钟虫科。聚缩虫病是河蟹溞状幼体期的主要疾病之一,如治疗不及时,会给河蟹育苗带来很大危害。1989年,本场在河蟹人工育苗过程中。3～5日龄的第Ⅰ、Ⅱ期溞状幼体发生了严重的聚缩虫病,我们采用甲醛和新洁尔灭治疗该病效果较好。一、病症聚缩虫成树枝状,其根部寄生于河蟹溞状幼体的头胸部、腹部等处,附肢上未见有寄生现象。一般情况下,感染强度为1～5个,被感染的溞状幼体活动能力弱,体质瘦 Zoothamnium is a protozoan door, ciliates Gang, Phyllanthus, clockworm Division. Cysticercosis is one of the major diseases of crab-like juveniles, such as the treatment is not timely, will bring great harm to the crab breeding. In 1989, the field in the crab artificial breeding process. Severe trichomoniasis occurred in the first and second instar larvae of stage 3 to 5, and we treated them with formaldehyde and benzalkonium bromide. First, the disease polygonatum into dendritic, its roots parasitized in the crab-like larvae head and chest, abdomen, etc., appendages no parasitic. Under normal circumstances, the infection intensity of 1 to 5, the infection of the larvae larvae activity is weak, thin body