冬放鱼种不仅能提高成活率,还可促进早春生产,使鱼增重快、早获利,可增加收入40%～50%。其主要技术是: ——池塘“五改”。即小改大,浅改深,死(水)改活(水),漏(水)改保(水),抢(险)改防(洪)。若有条件,新建高产鱼塘更好,以保证有良好的养鱼设施。——清塘消毒。宜在晴天进行,清塘方法有两种:一是干法清塘(留水深 Winter fish species can not only improve the survival rate, but also promote early spring production, so that fish weight gain fast, profit early, can increase income 40% to 50%. Its main technology is: - Pond “five changes ”. That is, small to large, shallow to deep, dead (water) to change (water), drain (water) to change the warranty (water), grab (insurance) to prevent (flood). If conditions permit, new high-yielding fish ponds are better to ensure good fish farming facilities. - Qing Tong disinfection. Should be carried out in sunny days, there are two clear pond methods: First, dry pond (stay deep water