In koi fish, generally, ground water or clean water (no sewage like mud pond) is injected into the compartment of sterilized cement pond or simple plastic cloth pond, and fish nests for laying eggs are arranged inside. Then, let the male and female parent carp swim and fertilize in it. In order to prevent the fish eggs attached to the fish nest from being attacked by miscellaneous bacteria after spawning, they should be disinfected immediately to prevent the fish eggs from spoilage. (There may be mixed bacteria attached to the parent carp, and disinfection is common sense).

2) Management of juvenile fish ponds:

After the fry are hatched in the spawning pond, they are put into the outdoor juvenile fish pond for feeding before being raised in autumn. Generally, mud ponds used in juvenile fish ponds are built by digging paddy fields, and the main producing areas are mountainous and ravine topography, so it is impossible to use river water to dissolve groundwater or rainwater that seeps into the ground and then gushes out with ice and snow. The same is true of fresh water supplement in feeding, and its water quantity is limited to a small amount. That's because we should also consider keeping the appropriate temperature for fish farming. From these points of view, because of the high possibility of invasion of pathogenic bacteria or parasites in the river water source where wild fish live, it is not considered to be used for feeding young fish. When you use the earthen pond, you don't just fill it with water. During the drying period, lime should be sprayed for disinfection and stabilization.

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Other valuable tasks, such as putting some new fertile soil or fertilizer, strive to create the best environment for feeding young fish. In other words, koi fish should be kept in an artificial environment until the autumn harvest.