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多子小瓜虫(Ichthyophthirius multifiliis Fouquet,1876)主要寄生在圆口铜鱼的皮肤、鳍、颌须和鳃上．小瓜虫破坏鳃的程度分为3个层次:轻度,小瓜虫寄生在鳃上皮,鳃丝未发生粘连;中度,鳃丝发生粘连,鳃丝的基本形态仍可辨;重度,虫体大量寄生,鳃结构受到严重破坏,鳃丝基本形态以难以辨别．感染部位均有不同程度的上皮增生,形成白色囊泡;皮肤和鳃上的一些寄生部位糜烂,部分上皮缺失;鳍条被挤压变形,严重者鳍缺失．
Ichthyophthirius multifiliis Fouquet (1876) is mainly parasitic on the skin, fins, jaws and gills of the round-necked copperfish. Small melon damage degree of the gill is divided into three levels: mild, small melon parasites in the gill epithelium, gill filaments did not occur adhesions; moderate, gill filaments adhesions, gill filaments of the basic form is still discernible; severe, worms A large number of parasites, gill structure was severely damaged, the basic form of gill filaments difficult to discern. Infection sites have varying degrees of epithelial hyperplasia, the formation of white vesicles; some parasitic parts of the skin and gills erosion, part of the epithelial deletion; the fin is squeezed deformation, in severe cases, missing fin.