There are six ways to remove miscellaneous fish from ponds.

A large number of wild miscellaneous fish in the fish pond compete with domestic fish for food and oxygen consumption and have no commercial value, which affects the production and economic benefits of domestic fish culture in the pond. the following six methods can be used to remove miscellaneous fish.

Miscellaneous fish

1. Clear the pond thoroughly. Before releasing fish fry, drain the pond water and clean the pond with disinfection drugs such as quicklime and strong chlorine essence to thoroughly kill wild miscellaneous fish, snails, aquatic insects, bacteria and parasites.

2. Water source filtration. Water source filtration can effectively control the number of wild miscellaneous fish. Especially for fish fry and fry ponds, the influent water is generally filtered with polyethylene or sieve silk material of 2mm mesh, which can stop miscellaneous fish, fish eggs, aquatic insects and so on.

3. Exposure to water plants. When feeding aquatic plants in fish ponds, exposure to the sun for 2 hours or soaking in 5 mg / L copper sulfate solution for 2 hours can kill small miscellaneous fish, shrimp and fish eggs attached to aquatic plants.

4. Set up fish nest. In the breeding season of domestic fish, the nests for wild miscellaneous fish to lay eggs are set up with tree roots and aquatic plants in the fish pond, and the nests attached to fish eggs are removed in time. Or after finding that the fish nest is attached to the fish eggs, sprinkle strong chlorine, bleach, trichlorfon and other drugs around the pond in the morning to kill the fish eggs or juvenile fish.

5. Biological clearance. Two-year-old fish ponds or adult ponds with more miscellaneous fish can use ferocious carnivorous fish such as black fish, catfish, mandarin fish, catfish and yellow catfish to remove miscellaneous fish and shrimp. Only ferocious carnivorous fish can be released in ponds that can be caught in dry ponds, because the number of ferocious fish should also be controlled so as not to cause harm. The size of ferocious mixed fish is about 1/3 of that of domestic fish, otherwise it will endanger domestic fish.

6. Round up wild miscellaneous fish. Pull catch is carried out in the fish growing season, and the high density of fish is concentrated in the net in a short period of time. Because the asphyxiation point of wild miscellaneous fish is lower than that of domestic fish, after most of the wild miscellaneous fish suffocate and die in a short time, put the domestic fish back in the fish pond.