On April 27th, Xu Guocheng of Chaohu City, Anhui Province, said on the telephone that he had raised 30 mu of crayfish in the pond, which provided crayfish fry to the hatchery of the previous year, and did not disinfect ponds. As a result, more wild fish (carp, squid, etc.) are found in ponds, and food robbing is more serious. At present, the size of crayfish is about 30 grams per person. He asked what method can remove small fish but does not affect the growth of crayfish.
The reporter contacted Tang Jianqing, a researcher at the Department of Aquaculture at the Institute of Freshwater Fisheries, Jiangsu Province. Tang Jianqing said that biological methods can be used to remove small mutilated fish from crayfish farming ponds, mainly utilizing the characteristics of carp only eating active feed (small impact on crayfish). , Little crayfish are eaten, and the conversion of crayfish pools into small oysters with higher economic value improves the efficiency of pond culture.
In addition, the reporter also contacted Ding Fengqin, a researcher of the Aquaculture Institute of Anhui Provincial Academy of Agricultural Sciences. Ding Fengqin also said that if the farmer wants to obtain higher benefits, he can breed some squid. In the case of not adding feed fish, 3 to 5 tails of stocking carp can be used per acre; if fish feed is properly added in the later period, 10 to 15 tails of carp can be raised per acre. At present, the implementation of the crayfish and squid "1113" breeding mode in Anhui Province has a relatively high economic efficiency. The ponds are mainly farmed eel, and the average yield is 100 kilograms of eel, 100 kilograms of crayfish, and 100 kilograms of large-size species. Mu pure benefit 3000 yuan.
"If the reader does not have experience in salmon farming or is concerned about any problems in the salmon farming process, some hemoglobin-type lectins can be used directly to kill small trash fish," said Ding Fengqin. For example, the “fish killing shrimp and shrimp safety†produced by Hebei Bohai Biotech Co., Ltd. can remove all kinds of wild fish, loach, snail, shellfish, etc. in the pond, but the shrimp and crab are harmless. 1 to 60 meters per mu water depth.
In addition, according to China Lobster Net's "Freshwater Crayfish pond intensive culture technology," the data show that if the crayfish pond found more wild fish, 7 to 10 kg of tea seed cake per acre can be soaked in Quanchiposa, on the one hand Clearing the wild fish in the pond, on the other hand, also promotes the crawfish clam shell.
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