Stocking densities are related to overwintering methods, water quality, aeration conditions, sewage, water exchange convenience, and fish size. Small wintering pools with small bodies of water, usually with stocking densities: temperature-flowing pools, brood stocking densities of 1,500 kg per mu, 50,000-80,000 fishes of 3-6 cm; indoor still water cement pools that can frequently change water, broodstock The stocking density is 500 kg per mu, and 3 to 6 cm of 10,000 to 15,000 species of fish; the overwintering earthen ponds covered with plastic film are inconvenient for replacement and drainage. The broodstock stocking density is 750 kg per mu and 3 to 6 cm. There are 20,000 to 30,000 fish species.
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