One acre of fish pond can raise 1000 fish and shad. It should be noted that only one kind of fish can't reach per mu 1000, so it must be nursed back to health. That is to raise a variety of fish, but different fish have their own activity space, such as silver carp in the middle and upper layers, grass carp in the middle and lower layers, and carp in the bottom layer, so that they will not interfere with each other and the pond resources can be used to the maximum extent.