一、鱼病传播的主要途径1.鱼体本身带有的病原体。池塘所放养的鱼种,有些个体本身常带有大量的致病菌或寄生虫。因鱼种个体较小,这些病原体常寄生在鱼的体表、鳍条、鳍基部、鳃瓣及鳃丝上,有些寄生于肠道内或腹腔中。2.环境因素所致。池塘的环境因素较为复杂,并且也是鱼类病原体的主要滋生场地和传播源;一些病原微生物常通过水体的流动从一处流向另一处,所到之处都被污染;有些病原体衍生于过厚的淤泥或水草之中,当水温适宜时,就可进行大量繁殖;而有 First, the main way of fish disease spread 1. Fish itself with the pathogen. Pond stocking species, some individuals often contain a large number of pathogens or parasites. Due to the smaller individual species, these pathogens are often parasitic on the body surface of fish, fins, fin base, gill valves and gill filaments, some parasites in the intestine or abdominal cavity. 2. Environmental factors. Pond environmental factors are more complex and are also the breeding grounds and sources of fish pathogens; some pathogenic microorganisms often flow from one place to another through the flow of water, where they are contaminated; some are derived from being too thick Of mud or aquatic plants, when the water temperature is appropriate, can be a large number of breeding; and yes