Tilapia is one of the most successful freshwater aquaculture species introduced and promoted in China. However, due to the rapid development of the scale of cultivation, the contradiction of increased wintering seedlings, degenerative germplasm, and low fertility rates are prominently manifested. Over-breeding has caused a large number of low-value juveniles to compete for bait and space, which has seriously affected the adult fish yield, quality (uncertain scale) and aquaculture efficiency. The control of the growth of tilapia juveniles and the conversion of them into high-grade economic fish through the use of ferocious fish (Ukrainian fish), which are part of fish, is one of the effective measures to resolve this contradiction. Umbilical gluttony habits of small fish can prey on small tilapia and ensure the growth of big fish. Both are beneficial to each other. It not only solves the bait problem of black locust, but also ensures the growth rate of black pheasants and controls the quantity of tilapia. Accelerated the growth of tilapia. Not only can the production of tilapia be guaranteed, but also the total aquaculture production on the surface of ponds. Therefore, this breeding mode is the most ideal breeding method. The specific method of raising the main tilapia in the pool is as follows:
1. Production of razor clams in tilapia adult ponds: There are many species of tilapia, including Nile tilapia, Mozambique tilapia, Olivia tilapia and red tilapia, and hybrid generations of Blessing fish and Nguru fish. Wait. In addition to maleated tilapia, other species can be grown in adult fish ponds.
(1) Time for stocking black bream fish species: tilapia can be stocked at a temperature above 18°C. The Yangtze River basin is usually in late April and the southern part is earlier. In early April, the northern part is relatively late. The tilapia species used in this model, which uses the fish of the next year, will be sexually mature after 3 to 4 months of breeding, and will begin to breed in the first generation around August. Therefore, the stocking time for raising the species of Ukrainian species should be at the end of August. It must be emphasized that there are differences in the timing of sexual maturation of different species of tilapia, so the time for stocking should be adjusted flexibly. In short, after the tilapia breeding, small tilapia began to be released.
(2) Specification and stocking rate of black storks at the time of stocking: In order to be suitable for raising black quail, the specifications of tilapia fish should be larger, usually 40 to 60 grams. In this way, tilapia breeding time should be earlier, and the time of stocking of black oyster species can also be earlier and prolonged the growth time of black buckwheat. The specifications of pupa when it is out of the pond can reach 300-500 g. Similarly, the size of tilapia when it goes out of pond can also be larger, and the total production of commercial fish in ponds is significantly increased. Each mu can be stocked initially with about 8 to 12 centimeters of Ukrainian species of 400 fish. After growing for a certain period of time, the species size can be selected. Generally, a breeding cycle requires 2 to 3 times of breeding to maintain the same pool. The cultivated blackbird is of neat specifications. After the sorting, the size of the cultivar is reduced, and the density of the pupa is reduced to 100 to 120 per acre.
(3) Feeding and management points: The main fish pond raising tilapia adopts a small cement pool or soil pool, which is suitable for a pond with a depth of 1 to 1.5 meters. The planting of suitable amount of floating plants on the surface of the water requires a fixed position to create a hidden and predatory environment for the blackbird. Install bamboo fences or nylon mesh enclosures on the pool walls or ponds to prevent them from jumping out of the culture ponds.
(4) Breeding effect: If in the tilapia adult fish pond per acre, stocking 40 to 50 tails of 10 to 13 centimeters of black mullet, and catching them together with tilapia at the end of November, the weight of black quail can reach 250 to 400 grams. The average yield per mu is 18 kg.
2. In the breeding pool of tilapia, Umbellaria was raised: In Tilapia, the parent of tilapia used for breeding was released in fish ponds at the end of April. At the end of July, Ukrainian species will be planted. The specifications will be about 10 centimeters, and 60 to 70 pigs will be placed per acre. By the end of November, 20 to 25 kilograms will be produced.
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