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夏季干旱少雨,日照时间长,池塘中藻类在这种条件下繁殖很快,所以,由藻类引起的鱼中毒死亡及泛池现象时有发生,给养殖生产者造成一定损失。现将藻类引起的中毒原因及防治方法简述如下:1 引起鱼中毒的几种藻类1.1 湖淀 盛夏鱼池的下风面,常可见一层铜绿色的水花漂浮在水面,它是由蓝藻大量繁殖形成的,主要是由铜绿微囊藻和水花微囊藻组成。在显微镜下观察,它是由无数球形细胞密集在一起的群体,外面包着一层胶质膜,这些藻类含蛋白质较高,由于外面有一层胶膜,鱼吃后大部分不能消化。当这些藻类死后,蛋白质分解产生有毒物质,在水中积累多了,致使鱼类中毒死亡。
Summer drought, rainy days, long time ponds, algae breed very quickly in this condition, therefore, caused by algae fish poisoning and pan-pond phenomenon have occurred from time to time, causing some losses to the breeding producers. Algae are now caused by the poisoning causes and prevention methods are summarized as follows: 1 caused by several species of algae fish poisoning 1.1 Lake sedimentation Xiayu pond downstream, often seen a layer of copper-green water floating on the water, it is a large number of cyanobacteria multiply , Mainly composed of Microcystis aeruginosa and Microcystis aeruginosa. Observed under a microscope, it is a dense population of spherical cells together, covered with a layer of plastic film, these algae contain higher protein, due to the outer layer of plastic film, most of the fish can not be digested after eating. When these algae die, protein decomposition produces toxic substances, accumulating in the water, resulting in death of fish poisoning.