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夏秋期间,因高温、干旱、少雨,地处山区、丘陵、盆地的山塘、小水库因水体表面蒸发大,降雨补充水量受限,加上农田灌溉用水高峰,水产养殖用水日趋紧张。此时又是鱼类旺食旺长期,由于水量减少,水体载鱼量和密度增加,水源补充困难,以至投饲施肥不能正常进行,加上经常性的缺氧浮头,
During summer and autumn, due to the high temperature, drought and rain, the small reservoirs are located in the mountain ponds of mountainous areas, hilly areas and basins. Due to the large surface evaporation of water bodies and the limited recharge of rainfall, the water for aquaculture is increasingly tense. At this moment, the fish are flourishing and flourishing for a long time. Due to the decrease of the water amount, the quantity and density of the fish in the water body increases, the supplement of the water source is difficult. As a result, the feeding and fertilization can not be carried out normally,