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去年5月中旬至6月中旬、8月上旬至9月中旬,广东鳜鱼主要养殖地区中山市、顺德市、新会市及南海市等地先后发生鳜鱼暴发性流行病,造成了巨大的损失,严重挫伤了鳜鱼养殖渔农的积极性。患病鳜鱼的主要表现为: 1.外部特征:病鱼不食饵料鱼,或静卧池底、或缓慢独游、或在水中若隐若现、或潜伏池边不动。鳃部有原生动物和单殖类寄生,并发烂鳃;或虽有寄生虫寄生,但鳃丝无缺损病变,只是发白、缺血,身体或变白、或黑纹消失或变浅。在鳃部寄生的寄生虫
From mid-May to mid-June last year, from early August to mid-September, catfish outbreak epidemics occurred successively in Zhongshan, Shunde, Xinhui and Nanhai, the main breeding areas for catfish in Guangdong Province, resulting in a huge The loss seriously dampened the enthusiasm of catfish farming and fishery. The main manifestations of sick catfish: 1. External characteristics: sick fish do not eat bait fish, or lying on the bottom of the bed, or swimming alone, or looming in the water, or the pool edge of the fixed. There are protozoan and monophyletic parasites in the gills, accompanied by rotten gills; or parasitic parasite, but the gill filaments without defect lesions, just white, ischemia, body or white, or dark lines disappear or become shallow. Parasite parasites in the gills