Abstract: Simulation experiment was conducted to study the effects of cow dung degradation products on aquaculture water quality at different water depths and fertilization amount.The results showed that the effect of cow dung degradation products on water quality was mainly reflected in the effects on total phosphorus,soluble phosphorus and dissolved oxygen,but not on total nitrogen,ammonia nitrogen.The concentration of total phosphorus and soluble phosphorus in water was positively correlated with the amount of fertilizer,and negatively correlated with water depth,and there was a significant interaction between the two factors.

Key words: cow dung degradation products, nitrogen, phosphorus, water depth, fertilization amount