许多渔民对鱼类病毒性、细菌性疾病比较重视,往往忽视了鱼类的植物性敌害,从而给生产造成不应有的损失。植物性敌害主要有青苔、甲藻、水网藻、湖淀等。植物性敌害大量吸收水中营养,影响饵料生物的繁殖,减少鱼类的活动空间,造成鱼苗的死亡。具体的预防方法有以下几点:1、冬季干 Many fishermen pay more attention to the viral and bacterial diseases of fish and often ignore the plant predatory diseases of fish, thus causing undue losses to their production. Plant predators include moss, dinoflagellates, water algae, Lake and so on. Plant predators absorb a large number of nutrients in the water, affecting the breeding of food organisms, reducing the space for fish activity, resulting in the death of fry. Specific prevention methods are the following: 1, winter dry