鱼苗发花率很不稳定，高的达 70％～ 80％，低的仅百分之几甚至全军覆没。那么怎样提高鱼苗发花成活率呢 ?　　一、彻底清塘，清除塘中有害生物 　　冬季将池水排干，挖出过多的淤泥，让其冰冻和曝晒，使塘泥疏松，加速腐殖质分解，有利于水质变肥，促进天然水生生物的繁殖。鱼 Fry flower rate is very unstable, high up to 70% to 80%, low only a few percent or even annihilated. So how to improve the survival rate of fry? First, thoroughly clear the pond, clear the pond pest in winter to drain the water, dredged too much mud, let it freeze and exposure, so that the loose mud to accelerate the decomposition of humus, there Benefit from water quality change, promote the reproduction of natural aquatic organisms. fish