一、寄生虫病危害严重1、寄生虫寄生鱼体后,往往引起鱼体食欲减退、消瘦,影响鱼体生长,严重影响鱼体的商品价值。2、寄生虫大量寄生鱼苗体表或鳃上时,引起鱼体食欲减退,呼吸困难,往往造成大批量死亡。3、寄生虫寄生于鱼体后,破坏了鱼体鳃及皮肤、肠道等,组织器官往往被细菌乘虚 First, serious parasitic diseases 1, parasite parasites, the fish tend to cause loss of appetite, weight loss, affecting the growth of fish, fish seriously affect the value of the commodity. 2, a large number of parasitic fish fry parasites surface or gills, causing loss of appetite, dyspnea, often resulting in mass deaths. 3, parasites parasitic on the fish, destroyed the fish gills and skin, intestinal, etc., tissues and organs often take advantage of bacteria