丘陵地区的山塘、水库共同特点是水源不足,以雨水作为唯一的水源来补充水量,其中不少山塘还承担灌溉任务,一遇高温干旱,水量就急剧减少,造成养鱼水体减少,养殖密度增大,溶氧量降低,氨氮类、亚硝酸盐类、硫化物类等有害物质含量升高,使得鱼体 Hilly areas ponds, reservoirs common feature is the lack of water to rain as the only water to supplement the water, many of which also undertake irrigation task ponds, a case of high temperature and drought, the sharp decline in the amount of water, resulting in reduced fish farming, aquaculture Increased density, dissolved oxygen decreased, ammonia nitrogen, nitrite, sulfide and other harmful substances increased, making the fish