A method for ecologically efficient polyculture of river crab, Penaeus vannamei and freshwater shrimp

Abstract

An ecological high-efficient poly-culturing method of river crab, South America white shrimp and freshwater shrimp includes steps of 1), preparation of an outer pond for river crab cultivation: pond cleaning and disinfection, aquatic plant planting, snail feeding, and alga cultivating fertilizer water; 2) strengthened cultivation of large-specification of crab seed in a greenhouse earth pond; 3) desalting of marked white shrimp seeds in greenhouse earth pond; 4) seed stocking: freshwater shrimp seed stocking, crab seed stocking, and white shrimp seed stocking; 5) fodder feeding; 6) water quality control; 7) fishing and marketing. By using the greenhouse earth pond, the strengthened cultivation of crab seed and South America white shrimp seed are carried out in advance, the stocking type, specification, ratio and stocking time of the aquatic product seed of the cultivating outer pond are optimized; through stocking the large-specification of seed, the breeding cultivation is formed; except for obviously improving the seed survival rate and the breeding specification, the marketing time of aquatic product and high price at staggering peak can be advanced; the fodder feeding, water quality control, cultivation disease prevention and control and other production costs can be effectively reduced; the production and ecological efficiency of the crab pond can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of freshwater aquaculture, in particular to an ecologically efficient polyculture method for river crabs, Penaeus vannamei and freshwater shrimps. Background technique [0002] In recent years, affected by unfavorable factors such as the expansion of the cultivation area of ​​river crabs, the increase in production costs year by year, the continued low price of conventional aquatic products, and the failure to effectively expand the consumer market for commercial crabs, the cultivation of river crabs tends to make small profits, especially for small-sized commercial crabs. The selling price of crabs is already lower than the cost of breeding, and the market demand is poor, so it is difficult to sell. It often happens that river crab farmers lose money after a year of hard work; while the market demand for large-scale high-quality commercial crabs is relatively stable, and the selling price is high. Therefore...

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Problems solved by technology

[0006] 3. In the above-mentioned commercial crab breeding mode, only a few river crab farmers (enterprises) with strong technical capabilities can sell crabs with acceptable specifications (220g for male crabs and more than 140g for female crabs) and plumpness in time for the Mid-Autumn Festival and the National Day golden festival. Commercial crabs, and the ratio of commercial crabs of this size to bred crabs is difficult to exceed 40%;

[0007] 4. Under the single-culture mode, due to unfavorable factors such as single stocking of seedlings and high stocking density, river crabs are more likely to suffer from the phenomenon of "water slugs" and Penaeus vannamei is prone to "stealing death syndrome" in the middle stage of culture. A large number of breeding animals die or stagnate, resulting in a large feed factor and increased breeding risks;

[0008] 5. The polyculture model of river crab and Penaeus vannamei is often affected by unfavorable factors such as the low survival rate of Penaeus vannamei and the poor connection between crab species and shrimp species. Moss is prone to appear in the early stage of crab pond culture, and blue-green algae are prone to appear in the later stage of culture. In addition to increasing the cost of water quality control and labor costs, it will also lead to low yields of commercial crabs / shrimps, small breeding sizes, and a decline in the quality of aquatic products.

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