四、水质调控 养殖前期(投苗1个月内)基本上不换水,以添加水为主,直到注满水,同时施放有机肥或无机肥培育水色,使池水保持浅褐色或黄绿色、绿色,透明度控制在30～40厘米;中期采取逐步添补水或少许换水的方法;后期(投苗2个月以后)根据水质情况和水色变化适当换水,减少水质恶化的情况发生。如水色过浓 Fourth, the water quality control Early breeding (cast vaccine within 1 month) basically do not change the water to add water-based, until filled with water, while applying organic fertilizer or inorganic fertilizers to cultivate aqua, so that the water remains light brown or yellow-green, Green, transparency control at 30 to 40 cm; the middle to gradually add water or a little water change method; late (cast seedling 2 months later) according to water quality and color change appropriate change of water to reduce the deterioration of water quality. If the color is too thick