Method for breeding shrimp seeds in autumn and application
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A technology for shrimp seedlings and lobsters, which is applied in the field of crayfish farming, can solve the problems of late emergence, low survival rate, and restrictions on the market of crayfish in early spring, and achieve the effects of short breeding period, high survival rate, and increased water permeability
Active Publication Date: 2021-05-07
HUAZHONG AGRI UNIV
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Problems solved by technology
But so far, crayfish seed breeding is mainly in spring, and autumn seed breeding has technical problems such as late emergence and low survival rate, which limits the demand for crayfish to be marketed in early spring
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Embodiment 1
[0028] Present embodiment provides a kind of method of breeding shrimp seedlings in autumn, comprises the following steps:
[0029] Step 1. Paddy field selection and transformation: Select paddy fields with high terrain, fertile soil, close to water sources, good water retention performance, convenient drainage and irrigation, and no pollution sources around, and carry out transformation according to a unit of 20 mu. Using an excavator to excavate a circular ditch with a width of 4m, a depth of 1.5m, and a slope ratio of 1:2 along the paddy field, the gentle slope ratio of the field creates a three-dimensional breeding place for crayfish and increases the breeding space. Use the soil dug to widen and heighten the ridge around the paddy field to make it 80cm higher than the table top; install a U-shaped PVC drainage pipe with a diameter of 20cm in the ring ditch, and install multi-section casings at the water inlets at both ends to facilitate water level adjustment. Add a 60-me...
Embodiment 2
[0038] The difference between this embodiment and embodiment 1 is:
[0039] (1) The area of the paddy field in step 1 is 15 mu;
[0040] (2) The stocking specification of step S3 broodstock shrimp is 20 catties per mu;
[0041] (3) The protein content of the special feed for crayfish thrown in the step S5 is 32%;
[0042] (4) In step S6, the special feed for crayfish seedling stage is a fermented feed with a protein content of 36%.
[0043] According to statistics, adopt the method described in this embodiment to carry out shrimp seedling cultivation, the survival rate of final shrimp seedling is up to more than 80%, and live shrimp seedling output is up to 30,000 tails / mu, and wherein, the large-scale shrimp seedling more than 5g can reach 2.4 10,000 tails / mu, accounting for 80%, and due to strict control of water quality, shrimp seedlings have no bacterial disease problems, and the quality is good, with high economic benefits.
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Abstract
The invention discloses a method for breeding shrimp seeds in autumn and application. The method comprises five steps of rice field selection and transformation, aquatic plant cultivation and maintenance, parent shrimp selection and cultivation, water level and water quality management and juvenile shrimp cultivation. According to the method for breeding the shrimp seeds in autumn and application, the technical problems that existing crayfish fry breeding is mainly conducted in spring, late seedling emergence and low survival rate exist in autumn fry breeding, and the crayfish is limited to appear on a market in early spring are solved. Multiple key technologies such as the aquatic plant selection and planting, the parent selection and cultivation, water level and water quality regulation and control and juvenile shrimp feeding in the breeding process are explored and innovated, so that yield, specification and quality of breeding the shrimp seeds in autumn are remarkably improved, the breeding method is simple, easy to implement, ecological and efficient, compared with breeding the seeds in spring, the period is shorter and the survival rate is high, and the problems of shrimp seeds vacancy in autumn and insufficient shrimp supply in winter are solved.
Description
technical field [0001] The invention belongs to the technical field of crayfish farming, and in particular relates to a method and application for breeding shrimp seedlings in autumn. Background technique [0002] The scientific name of crayfish is Procambarus clarkii. It belongs to the phylum Arthropoda, Crustacea, Decapod, Cryridae, and the genus Procambarus. It has a thick head and chest, a hard shell, and delicious meat. It is a low-fat, low-cholesterol, high-protein It is a nutritious and nourishing food, and it is an important freshwater economic crustacean culture species in my country. Under normal circumstances, crayfish seedlings are hatched in early spring and grow into large-sized seedlings in March-April. Therefore, the market cycle of adult shrimp is mainly concentrated in May-September, while adult shrimp are rarely listed in January-April. To meet consumer demand, the price is higher. In order for crayfish to be on the market in early spring, shrimp seedling...
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