Wild fish breeding in the pond, there is no commercial value, but also compete with the domestic fish for oxygen consumption, affecting the yield and economic benefits of pond culture, commonly used methods of removal are the following six.
1, completely clear pond. Before fry stocking, drain pool water, clear the pond with quicklime, strong chlorine and other drugs, completely kill wild fish, snails, aquatic insects, bacteria and parasites, etc., which are very good for stocking fry.
2, water filtration. Water filtration can effectively control the amount of wild fish. Especially for fry and fingerling ponds, the influent should generally be filtered, and the filter meshes should be made of polyethylene or sieving materials of 2 mm mesh, which can be used to stop miscellaneous fish, fish eggs and aquatic insects.
3, exposure of aquatic plants. When fish ponds are fed with aquatic plants, the aquatic plants are exposed to the sun for 12 hours, or the plants are soaked in a 5 mg/L copper sulfate solution for 2 hours to kill fish eggs and small-sized trash fish and shrimp attached to aquatic plants.
4, set the fish nest. In the fish breeding season, fish roots are set in the fish ponds with root water plants to allow wild fish to spawn in the fish nests. It was found that fish eggs were attached to the fish nest and the fish nest was removed and removed in time. Or when the wild fish spawn on the fish nest, in the morning, sprinkle the drugs such as trichlorfon, bleach, and strong chlorine extract around the pond to kill fish eggs or juvenile fish.
5, biological removal. Fish ponds with a lot of adulterated fishes, or fish ponds with a second-inferior age, can be used to eliminate trash fish and shrimps from ferocious fish such as blackfish, squid, leather beard, stingray, and bigmouth bass. Ponds must be able to catch fish in dry ponds in order to control the number of ferocious fish so as not to cause harm. Mixed ferocious fish, specifications should be less than two-thirds of the fish, otherwise it will harm the fish.
6, around the wild fish. In the fish growing season, the whole pool or some fish ponds are caught and caught, so that the fish pools are concentrated in the net in a short period of time. As the wild fish suffocation point is lower than that of domestic fish, most of them will suffocate and die in a short time. After most of the wild fish die, the fish will be returned to the pool.
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