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Low-salt overwintering and breeding method of portunus trituberculatus

A technology of swimming crab and crab fry, which is applied in fish farming, application, climate change adaptation and other directions, can solve the problems of low yield and poor quality of factory seedling cultivation, and achieves improvement of winter survival rate and seed yield. , the effect of improving the survival rate of winter

Inactive Publication Date: 2012-12-19
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned problems of Portunus trituberculatus seedling cultivation in the prior art, the purpose of the present invention is to provide a low-salt overwintering and seedling raising method of Portunus trituberculatus. Seed cultivation and other measures increase the seed production by 25.01%, and the breeding survival rate increases by 26.37%, which solves the problems of low yield and poor quality of wild brood crab factory seedling cultivation in the prior art

Method used

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  • Low-salt overwintering and breeding method of portunus trituberculatus

Examples

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Effect test

Embodiment 1

[0021] The low-salt overwintering and seedling raising method of a kind of portunus trituberculatus of the present invention specifically comprises the following steps:

[0022] 1. Selection of parent crabs: The parent crabs selected in the present invention are Portunus trituberculatus artificially bred. The selected parent crabs must meet the following conditions: high plumpness, complete appendages, smooth body surface, strong vitality, and no mechanical damage ;Large size, weight ≥ 250g, nail width ≥ 155mm; test for emulsification disease, vibriosis, ciliate disease and white spot syndrome virus (WSSV) to ensure that parent crabs do not carry the above-mentioned specific pathogens.

[0023] 2. Overwintering indoors: In November of that year, the parent crabs entered the pond to survive the winter. Before the parent crabs entered the pool, the overwintering pool and the parent crabs needed to be strictly disinfected. The parent crab disinfection method is: put the parent cra...

example 2

[0033] 1. Parent crab selection: Same as Example 1.

[0034] 2. Overwintering indoors: pool entry, management, overwintering time, etc. are exactly the same as Example 1, only the overwintering seawater is different from Example 1, and low-salt seawater (20‰) is used for overwintering.

[0035] Low-salt seawater deployment method: Extract underground brine and fresh water, mix them according to a certain ratio, adjust their salinity to 20‰, and store them in the reservoir for later use. Using this low-salt seawater for overwintering can avoid the spread of pathogens in natural seawater on the one hand; in addition, low-salinity can reduce the reproduction and growth of some pathogens and reduce the occurrence of diseases.

[0036] 3, intensive cultivation: with example 1.

[0037] 4. Lay out pools: Same as Example 1.

[0038] 5. Seed cultivation: with example 1.

[0039] 6. Crab seedlings come out of the pond: same as Example 1.

example 3

[0041] 1. Parent crab selection: Same as Example 1.

[0042] 2. Overwintering indoors: pool entry, management, overwintering time, etc. are exactly the same as Example 1, only the overwintering seawater is different from Example 1, and low-salt seawater (20‰) is used for overwintering.

[0043]Low-salt seawater deployment method: Extract underground brine and fresh water, mix them according to a certain ratio, adjust their salinity to 20‰, and store them in the reservoir for later use. Using this low-salt seawater for overwintering can avoid the spread of pathogens in natural seawater on the one hand; in addition, low-salinity can reduce the reproduction and growth of some pathogens and reduce the occurrence of diseases.

[0044] 3, intensive cultivation: with example 1.

[0045] 4. Lay out the young crabs in the pool: when the abdominal eggs of the parent crabs are black and gray, and the heart rate of the daphnia larvae in the egg membrane reaches 150-170 times, the parent ...

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Abstract

The invention provides a low-salt overwintering and breeding method of portunus trituberculatus. The method comprises the following steps that: manual seed selection parent crabs without any diseases are selected; low-salt seawater is used for carrying out parent crab overwintering and juvenile crab breeding, so as to avoid causing diseases and vertical disease transmission in an overwintering and breeding period; during the overwintering period, underground bittern and fresh water are used for mixing and preparing low-salt seawater for the overwintering, so as to cut off a transmission path of the diseases; baits are reasonably matched, and have complete nutrition, so as to accelerate the healthy development of parent crab embryos; the seawater with the 2 per mill salt degree is adopted to carry out juvenile crab breeding to simulate a natural environment which is suitable for egg laying of the parent crabs and juvenile crab growth, so that the yield and the quality of the juvenile crabs are improved; and the salt degree and the temperature of the sweater in a breeding pool are adjusted to be same as those of an outdoor cultivating pool at the time of 24 hours before the juvenile crabs are output, so as to avoid causing stress reaction due to that the environment is greatly changed. According to the low-salt overwintering and breeding method of the portunus trituberculatus, the overwintering survival rate and the juvenile crab yield of the portunus trituberculatus are improved and the outdoor cultivation survival rate is greatly improved; and the low-salt overwintering and breeding method of the portunus trituberculatus can be widely applied to sea-near sea areas and river mouth regions and has the obvious economic benefits.

Description

technical field [0001] The invention belongs to the technical field of Portunus trituberculatus artificial seedling cultivation, and in particular relates to a low-salt overwintering and seedling raising method for Portunus trituberculatus. Background technique [0002] Portunus trituberculatus is an important marine economic animal. Because of its fast growth, large body and delicious meat, it is deeply loved by the masses and has high economic value. Therefore, it is gradually developed as a breeding object. At present, the breeding area is 500,000 mu, and the output reaches 100,000 tons. It has become one of the leading species of marine farming in my country. At present, the annual demand for Portunus trituberculatus seedlings in my country is about 1.5 billion. However, in recent years, the survival rate of brood crabs overwintering is low, and the seed yield and quality have a downward trend. In Weifang, Shandong, the average yield of Portunus trituberculae seedlings a...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 高保全刘萍李健王学忠
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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