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A cultivation method and technology of crab seedlings, applied in the field of blue crab breeding
Inactive Publication Date: 2007-05-16
XIAMEN UNIV
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There have been some studies on the impact of intermediate cultivation technology of crab seedlings and salinity changes on the survival rate of crab seedlings (1. Ding Lifa, Zhou Youfu, Zhou Suqin, etc. The intermediate cultivation test report of Scylla serrata artificial seedlings. Qilu Fishery, 2002, 19(2): 1-4; 2. Qiao Zhenguo, Zhang Hu, Gui Congshi. Effects of environmental factors on the metamorphic survival rate of postlarvae and larvae of Scylla serrata. Marine Fisheries, 2004, 26(1): 40 -43; 3. Xu Xiaoqun, Zhu Xiaoming, Fei Liangliang, et al. Effects of different bait, density and pond bottom on molt metamorphosis of Scylla serrata megalopa. Journal of Xiamen University (Natural Science Edition), 2005, 44(2 ): 468-471), but in terms of desalination cultivation technology of crab seedlings, there is no report yet
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Embodiment 1
[0011] Cultivation pool area 20m 2 , 100,000 megalopa were released, and the breeding density was 5,000 / m 2 , feed copepods, fish paste, shellfish, and cultivate at a temperature of 25.5-28.5°C. The daily salinity decreased by 2, and after 7 days of desalination, the salinity dropped to 12, and the crab seedlings molted into the first stage larvae, with a survival rate of 62%.
Embodiment 2
[0013] Cultivation pool area 20m 2 , 60,000 megalopa were released, and the breeding density was 3,000 / m 2 , feed copepods, fish paste, shellfish, and cultivate at a temperature of 25.5-28.5°C. The daily salinity drops by 2, and after 7 days of desalination, the salinity drops to 12, and the crab seedlings molt and become the first stage larvae, with a survival rate of 87%.
Embodiment 3
[0015] Cultivation pool area 50m 2 , 100,000 megalopa were released, and the breeding density was 2,000 / m 2 , Feed copepods, shellfish, and prawns, and cultivate at a temperature of 27.0-31.5°C. The daily salinity decreased by 1.5, and after 10 days of cultivation, the salinity dropped to 10, and the crab seedlings molted into the second stage larvae, with a survival rate of 76%.
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Abstract
The invention relates to a method for cultivating green crab, wherein it uses multistage salt reduction method in culture pool, to obtain low-salt green crab. And said method comprises that putting shade into culture pool, the large-eye youth culture density is 2000-5000n/m2, the forage is fed two times each day; charging air in whole time; the initial salt degree is 22-26; the process is started at the second day; exchanging water and adding fresh water at least one time each day, the desalinating time is 7-15 days; the salt degree is reduced to 4-12. The invention has built the desalination cultivation, while the first-third crab survival rates can reach 60%, and the low-salt crabs (first-third) can live in 5-12 salt degree.
Description
technical field [0001] The invention relates to a method for cultivating mud crabs, in particular to a method for cultivating low-salinity crab seedlings by gradually reducing the salinity of cultivation pool water. Background technique [0002] Scylla has the advantages of large size, fast growth, and wide range of salinity adaptation. Scylla breeding has become a new marine industry. In the blue crab artificial nursery industry, broodstock and larval development are carried out under high salinity conditions. Adult crab farming is mostly distributed in low-salinity estuaries. Therefore, before the crab seedlings (megalopa and larvae) are stocked, they must be desalinated. Cultivating young crabs adapted to low-salt life is a prerequisite for large-scale breeding of blue crabs. There have been some studies on the impact of intermediate cultivation technology of crab seedlings and salinity changes on the survival rate of crab seedlings (1. Ding Lifa, Zhou Youfu, Zhou Suqi...
Claims
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