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Sets of fish-eating species are suitable for the nesting of some carnivorous fish in the same pond, such as squid, black mullet (Blackfish), Californian squid, and squid. These fishes can be used to clear the low economic value of the pond. The small wild miscellaneous fishes are converted into high-quality aquatic products, which in turn reduce the competition for food and competition for oxygen and increase the yield of farmed fish. Generally, 10 to 30 tails of carnivorous fish can be reared on the water surface per acre. If the feeding is not increased, the quality fish can be increased by about 10 kilograms and the output value can be increased by 150 to 200 yuan.
The chiefly cold-cultivated species are tropical fish and shrimp, such as tilapia, freshwater whitefish, Brazilian bran, and Macrobrachium rosenbergii, Penaeus vannamei, etc. These breeds are of good flesh quality and have bright colors, and can be used as fishing targets for breeding. The requirements are not high, and they can be either monocultured or polycultured, and the breeding cycle is short and effective.
The long-legged species of polyculture includes polyculture of turtles, turtles, river crabs, green prawns, bullfrogs, and American frogs, and it can be used mainly for fish, as well as for turtles, crabs, and shrimps. If fish is the main species, dozens of turtles will be stocked per acre, small pools of fish in the pool will be used, and some feed will be added. It is easy to produce 10-20 kg of soft-shelled turtles.
Intensive rearing “afternoon†breeds include the introduction of triploid fishes such as Xiangyun wolfberry and Xiangyun wolfberry. Because these fish can not breed offspring, they have the advantages of fast growth, tender meat and delicious taste, and they can feed at a lower temperature (5°C), relatively prolonging the growth period and yielding higher yields.
At present, the output of aquatic products has increased significantly, which has caused difficulties in sales and prices, and the economic efficiency of aquaculture farmers has generally declined. How to improve the breeding efficiency? It is recommended to actively adjust the variety structure.