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10月份,河北省各地秋高气爽,水体溶解氧升高,气温和水温逐渐下降。多数鱼类已进入越冬前的最后生长期,由于池塘载鱼量较大,前期投饵量较多,残饵及代谢物也沉积较多,易厌氧发酵产生氨氮、硫化氢等有害物质,同时昼夜温差逐渐增加,上下水层对流加
In October, all over Hebei Province, autumn, dissolved oxygen, water temperature, temperature and water temperature gradually decreased. Most fish have entered the final growth period before winter, due to the larger amount of fish in the pond, the amount of feeding more, bait and metabolites also deposited more easily anaerobic fermentation of ammonia, hydrogen sulfide and other harmful substances, At the same time, the temperature difference between day and night is gradually increasing, and the upper and lower aquifer convection plus