车轮虫、小瓜虫是对鱼苗、鱼种危害严重的两种寄生原生动物,二者由于繁殖水温接近,有可能同时并发,笔者在四川大足县及其他地方均发现过。现将其症状、感染情况及其防治方法综合报导如下: 一、症状及感染情况1.以车轮虫为主的并发症:患病鱼苗成群沿塘边狂游,食欲减退或不摄食,鱼体消瘦,体表粘液分泌增多。部分病鱼苗体表、鳍、头部出现一层白翳,在水中尤为明显。镜检发现鱼苗体表及鳍有大量车轮虫寄 Carrot insects, small melon insects is a fry, fish serious damage to the two parasitic protozoa, the two due to the breeding water temperature close to the possibility of simultaneous concurrency, the author found in Dazu County, Sichuan and elsewhere. Symptoms, infections and their prevention and treatment methods are now reported as follows: First, the symptoms and infections 1 to whetstone-based complications: sick fry swarm swim along the pond, loss of appetite or no food, fish Body weight loss, increased body surface mucus secretion. Some sick fish fry body surface, fins, head layer of white stirrup, especially in water. Microscopic examination revealed a large number of fern fry body surface and foraminifera sent