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一、流行特点与危害1“.蛙泳”现象的流行特点。(1)该现象的流行无明显的规律性,从4～10月份均可发病,但主要发生于夏、秋两季生长较快、摄食量较大的时期。(2)各种养殖规格的、吃饲料的鱼类均可发生,但以大规格的草鱼、青鱼最为常见,种草养鱼的很少发生。(3)使用消毒剂、杀虫剂以及采用抗菌药物治疗,不仅无明显效果,反而还可能因药物刺激加重病情。(4)该现象的发生与饲料关系不大,换料并不一定能改善或缓解这种现象的发生;即使是投喂同一种饲料的池塘,有的可能发
First, the popular features and hazards 1 “. Breaststroke ” phenomenon of the popular features. (1) The epidemic of this phenomenon has no obvious regularity, and it can be affected from April to October, but mainly occurs in the period when the growth of summer and autumn is relatively fast and the food consumption is relatively large. (2) A variety of aquaculture specifications, eat fish can occur, but large-size grass carp, herring are the most common, grass-fed fish rarely occur. (3) The use of disinfectants, pesticides and antibacterial drugs, not only no significant effect, but may also be aggravated by drug-induced illness. (4) The occurrence of this phenomenon has little to do with feed, refueling does not necessarily improve or alleviate the occurrence of this phenomenon; even if the pond is fed the same feed, some may