In the case of high-density farming, there are more baits and dirt in the fish ponds, and anaerobic fermentation produces harmful substances such as ammonia nitrogen and hydrogen sulfide, which deteriorates the water body, especially in the summer hot season, and the water quality changes more quickly.
Regular water injection is one of the most commonly used and most economical methods of regulating water quality. The new water is usually filled every 7-10 days, each time adding 15-20 cm of water. When the deterioration of the pool water is severe, water changes should be adopted to maintain good water quality conditions. For ponds mainly for raising pupa and squid, the water color should be kept green or dark brown with a transparency of 20-30 cm; the ponds with mainly grass raising and squid, the water color of the ponds and the squid ponds should be slightly lighter, each 7- About 10 days should be filled with fresh water once, each time should increase the water level 15-20 cm. Summer fish ponds should try to maintain the highest water level.
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