Method for promoting spawning of green crabs
A technology of mud crab and dry dew, which is applied in the field of improving the brooding rate and promoting the spawning of mud crabs
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Embodiment 1
[0017] From August 1st to August 17th, 2017, the blue crab breeding experiment site of Ningbo Ocean and Fishery Research Institute, Zhejiang Province, collected 36 blue crabs "red cream crabs", dried for 48 hours, and placed them on 22 square meters In the cultivation pond, the cultivation pond is built with bricks to a height of 10cm, and a partition made of cement board or plank is laid on the top, with a gap of 1cm between the partitions, and a 40-mesh sieve tulle is laid on the partition. Spread 10cm of coarse sand, and place an inflatable head or an inflatable tube on the sand. There are 50 mature male blue crabs stocked in the cultivation pond, and a layer of sunshade net is covered on the top. The water level of the cultivation pond is 50cm, continuously inflated, and the seawater salinity is 25‰, and the clams are fed every day. Obtain 10 egg-bearing crabs in the previous week. After removing the egg-bearing crabs, dry the remaining seed crabs for 5 hours, continue to ...
Embodiment 2
[0019] From August 23rd to September 10th, 2017, 25 species of crabs were collected, and the dew dried for 24 hours after catching, and they were stocked in the cultivation pond for cultivation, and the cultivation method was the same as above. In the first week, there were 3 egg-bearing crabs. On August 31 and September 3, they were dried for 5 hours each. By the third week, a total of 13 egg-bearing crabs were obtained. The survival rate of blue crabs was 88%, and the egg-bearing rate was 59%. .
Embodiment 3
[0021] From August 4th to September 3rd, 2017, 15 blue crabs were selected from the breeding ponds, and the drying time after fishing was about 5 hours, and they were cultivated. The cultivation method was the same as above, and there was no dew during the cultivation period. A total of 3 egg-bearing crabs were obtained. The survival rate of the parent crabs was 93.3%, and the egg-bearing rate was 21.5%.
[0022] From the comparison of Example 1 to Example 3, it can be found that after fishing and in the breeding process, dew-drying the breeding crabs can promote the ovulation of blue crabs and improve the oviposition rate.
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