鱼种在出塘前必须要进行拉网锻炼。因为拉网使鱼受惊,增加运动量,可使肌肉更结实,同时幼鱼在密集过程中会分泌粘液和排出粪便,增加耐缺氧适应力,并且在运输中可避免大量粘液和粪便污染水质,因而有利于提高运输成活率。另外,拉网还可以除去野杂鱼,消灭水生昆虫,估计鱼数。 Fish in the pond before the need to conduct a net exercise. Because pull the net so that the fish scared, increase the amount of exercise, the muscles can make more firm, while juvenile fish in the intensive process will secrete mucus and excrete manure, increase resistance to hypoxia, and in transport can avoid a lot of mucus and manure pollution of water quality, Thus helping to improve the transport survival rate. In addition, pull the net can also remove wild trash fish, eliminate aquatic insects, the estimated number of fish.