鳃病是养殖鱼塘中最为常见的多发病之一,因养殖鱼塘的养殖密度较高,极易引发鳃病等。所以,必须引起养殖场(户)的重视,搞好防控工作。养殖鱼塘的常见鳃病主要有细菌性鳃病、霉菌性鳃病、吸虫类鳃病、营养性鳃病与原虫性鳃病。1.细菌性鳃病(1)临床症状病鱼体色发黑,离群上浮水面,食欲减退或废食。鱼鳃粘液增多,且鳃丝腐烂带泥, Gill disease is one of the most common frequently-occurring diseases in farmed fish ponds. Due to the high culture density of farmed fish ponds, it can easily cause gill diseases. Therefore, we must pay attention to farms (households) and do a good job of prevention and control. The common gill disease of farmed fish ponds are bacterial gill disease, mold gill disease, gill disease, nutritional gill disease and protozoan gill disease. 1. Bacterial gill disease (1) Clinical symptoms Fish body color black, floating up the water surface, loss of appetite or waste food. Gill mucus increased, and gill filaments rot with mud,