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Key Technical Points for Pond Culture of Freshwater Pompano
The freshwater pompano is a large economically important fish of tropical and subtropical regions, valued both as food and as an ornamental fish. It has the advantages of omnivorous feeding habits, fast growth, large individual size and few diseases. In pond culture it generally lives in the middle and lower layers of the water body, and its tolerance to low oxygen is stronger than that of ordinary fish, with dissolved oxygen required to be above 3
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Detailed Explanation of Key Technical Points for Mandarin Fish Pond Aquaculture
As people's living standards continue to rise, wild salmon falls far short of meeting market demand, so healthy salmon aquaculture has good development prospects. Mandarin fish is also called mandarin fish, jihua fish, etc. It belongs to the order Perciformes, genus Siniperca, and is widely distributed. In all major river
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Detailed Explanation of Key Technical Points for Raising Mandarin Fish in Ponds
(1) Selection of breeding conditions: Choose a pond with abundant water source, convenient water filling and drainage, and excellent water quality, with a pond area generally of 2~3 mu and a water depth of 1.5~2 m. (2) Preparation before stocking: ① Disinfect the pond. ② After clearing the main breeding pond, apply decomposed base
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Key Technical Points for Two-Stage Cage Culture of Mandarin Fish
I. Cage Structure and Setup 1. First-stage cage (breeding cage). Made of knotless netting, mesh size 0.5-1.0 cm, dimensions 10 m x 1.3 m x 1.5 m, quantity 3. 2. Second-stage cage (grow-out cage). Mesh size 1.5-2 cm, small-volume cages 3 units, dimensions 2 m x 2 m x 1.8 m; con
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Key Technical Points for Pollution-Free Pond Farming of Black Carp
Black carp, also known as qing huan, luosi qing, hei huan, or gang qing, is one of China's four major domestic carps and belongs to the subfamily Leuciscinae of the family Cyprinidae, order Cypriniformes. Its body is cylindrical, with a laterally compressed tail and a rounded belly; the back and the upper half of the flanks are blue-black, the belly is milky white, and all fins are grayish-black.
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Key Points of Artificial Breeding Technology in Black Carp Aquaculture
The black carp is an excellent species for freshwater aquaculture in our country. It uses benthic organisms as feed, grows quickly, has a large individual size, tender flesh, and good flavor, and is high in fat and protein with abundant vitamin content, making it highly valued by the public and professional aquaculture households. The demand for fry is increasing day by
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Detailed Explanation of Key Points in Artificial Breeding Technology for Yellow Catfish
Yellow catfish, also known as Wansi fish or Jiangsang fish, is a fecundity-type fish with strong adaptability and can be bred in various water bodies. It is easy to raise, commands a high price, and yields good returns. Its flesh is tender and its taste is delicious, making it a high-quality premium aquatic product that is increasingly favored by consumers.
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Key Technical Points for Semi-Artificial Propagation and Culture of Yellow Catfish
Because the testes of male yellow catfish are dendritic in shape, semen cannot be squeezed out; therefore, in current fully artificial propagation, the usual practice is to kill the male fish, remove the testes, cut them into pieces, and perform artificial insemination, after which all the male fish die. After manual egg squeezing, the vast majority of female fish also die. Fully artificial
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What are the key technical points for polyculture of yellow catfish?
The yellow catfish (Pelteobagrus fulvidraco) is a bottom-dwelling omnivorous fish, with delicate flesh, rich nutrition and extremely high economic value, making it a farming species with great market potential. The yellow catfish has strong adaptability and a slower growth rate than cyprinid fish, but grows relatively fast for its own species; fry bred in the same year can reach market size in that same year, and the population yield is relatively high. Because artificial breeding technology is not yet mature, large-scale artificial farming faces certain difficulties, so carrying out polyculture has become imperative. Polyculturing yellow catfish in fish ponds has the following advantages: First, it can feed on low-value small miscellaneous fish and shrimp, residual feed of fish, organic debris, zooplankton, etc. in the pond, increasing the net yield of the pond. Second, the yellow catfish feeds on parasites such as Lernaea in the water, which can reduce the occurrence of fish diseases. Third, without affecting the yield of the main cultured species, adding 5 kg to 20 kg of yellow catfish per mu can increase the benefit by more than 100 yuan per mu. The polyculture techniques are introduced as follows:</p><p></p><p>I. Polyculture in adult fish ponds</p><p>Polyculturing yellow catfish in adult fish ponds places no strict requirements on the main fish species cultured in the pond. Ponds culturing the four major Chinese carps and ponds mainly culturing feeding fish (such as carp and crucian carp, tilapia, freshwater pomfret) can all be used for polyculturing yellow catfish. The pond area is 20 mu to 30 mu, the water depth is 2 m to 2.5 m, with sufficient water source, good water quality and convenient water injection and drainage. Generally, 40 to 50 yellow catfish are stocked per mu, with a size of 3 cm per fish to 4 cm per fish, which can increase the yellow catfish yield by 5 kg to 8 kg per mu.</p><p>II. Polyculture in broodstock ponds</p><p>Polyculture in broodstock ponds can not only make full use of the water space of the broodstock pond and improve the utilization rate of the broodstock pond, but the yellow catfish can also feed on some small wild fish in the broodstock pond that compete with the broodstock for food and consume oxygen. After the artificial breeding of broodstock is completed, stock 40 to 60 yellow catfish per mu, with a size of 2 cm per fish to 3 cm per fish, which can increase the yellow catfish yield by 6 kg to 10 kg per mu.</p><p>III. Polyculture in adult crab ponds</p><p>Polyculturing yellow catfish in crab ponds can make full use of the natural bait organism resources in the crab pond. Generally, the crab pond area is 30 mu to 50 mu, with a aquatic plant coverage rate of about 50%; after the crab seed is stocked, stock 30 to 50 yellow catfish per mu, with a size of 3 cm per fish to 5 cm per fish, which can increase the yellow catfish yield by 5 kg to 10 kg per mu.</p><p>IV. Polyculture in rivers and ditches</p><p>There are many low-value wild miscellaneous fish in rivers and ditches, and polyculturing yellow catfish can save artificial bait. Generally, stock 40 to 60 yellow catfish per mu, with a size of 2 cm per fish to 4 cm per fish, which can increase the yellow catfish yield by 6 kg to 12 kg per mu.</p><p>V. Polyculture in large water bodies</p><p>Polyculturing yellow catfish in large water bodies gives a high population yield, neither affecting the yield of the main cultured species nor requiring additional bait. Generally, stock 40 to 60 yellow catfish per mu, with a size of 3 cm per fish to 4 cm per fish, which can increase the yellow catfish yield by 8 kg to 15 kg per mu.</p><p>No matter which polyculture method is adopted, the following matters must be noted in farming management:</p><p>I. Maintain a relatively high dissolved oxygen level in the water body. The yellow catfish has relatively high requirements for dissolved oxygen in pond water, so polyculture requires fresh water quality and sufficient dissolved oxygen; during the growing season, new water should be added in a timely manner, and during the high-temperature season, water should be changed frequently; maintaining a slight water flow is even better.</p><p>II. Maintain a reasonable stocking density and stocking size. According to the bait organism biomass in the water body, scientifically and reasonably determine the polyculture ratio and stocking size; generally, 30 to 60 fish per mu is appropriate, with a stocking size of 3 cm per fish to 4 cm per fish. If the density is too high and the size too small, the market size cannot be reached by the end of the year.</p><p>III. After polyculturing yellow catfish in a fish pond, it is no longer suitable to polyculture other carnivorous fish, and yellow catfish should not be polycultured in ponds for farming freshwater prawns or freshwater crayfish.</p><p>IV. During the farming process, if the yellow catfish are found to be too small, it indicates that the natural bait organism biomass in the fish pond is insufficient; small miscellaneous fish and shrimp, summer fry of domestic fish may be appropriately added, or specially formulated artificial yellow catfish bait may be fed. When feeding artificial bait, the main cultured species should be fed first (put into the shallow water area), and then the yellow catfish (put into the deep water area). The yellow catfish has the living habit of hiding by day and coming out at night, so feeding should mainly be done at night.</p><p>V. When polyculturing yellow catfish in crab ponds, because the river crab and yellow catfish occupy the same water layer position ecologically, it is easy to cause competition for ecological position between the two. Therefore, sufficient natural bait organisms must be maintained in the crab pond, otherwise the yellow catfish rearing effect will be affected. In advance, 300 kg to 400 kg of spiral shells per mu can be put into the crab pond, along with some egg-bearing crucian carp and egg-bearing freshwater shrimp, allowing them to reproduce naturally for the river crab and yellow catfish to feed on freely.</p>
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Key Points of Ecological Aquaculture Technology for Yellow Catfish in Paddy Fields
I. Selection of the breeding area The breeding area is 65 hectares, with complete water, electricity and other facilities and convenient transportation. II. Paddy field engineering construction 1. For the field engineering, 10 mu is taken as one ecological aquaculture unit for yellow catfish in paddy fields. On the inner side of the paddy field ridge, a ring ditch with a top width of 1.5m, bottom width of 0.5m and depth of 0
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