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

Inactive Publication Date: 2018-05-15
NINGBO ACAD OF OCEAN & FISHERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dry dew stimulation is very effective in inducing spawning in aquatic seedlings, especially shellfish,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention provides a method for promoting spawning of green crabs. The method comprises the following steps: after catching of seed green crabs, banding the seed green crabs with ropes, placing the seed green crabs in a dark and moist room, carrying out dry exposure for 24 hours to 48 hours, and controlling a temperature in a range of 15 to 32 DEG C; after completion of dry exposure, stockingthe seed green crabs into a culture pond, carrying out culturing, wherein the culture pond has a water level of 50 to 60 cm and a seawater salinity of 20 per thousand to 35 per thousand, and stockingmature male green crabs into the culture pond, wherein the stocking density of the male green crabs is 2 to 3 crabs/m2; feeding shellfish every day, wherein the feeding amount of the shellfish accounts for 10% of the total weight of all green crabs in the first week, and is gradually decreased to 2% of the weight of the green crabs after the first week; and after one week, removing ovigerous greencrabs, carrying out dry exposure again for 5 to 10 hours, then carrying out culturing with seawater, subjecting non-ovigerous seed green crabs to dry exposure again for 5 to 10 hours every 3 days, and carrying out repeating for 2 to 4 times. The method provided by the invention selects the seed green crabs with mature gonad, adopts a measure of dry exposure for a plurality of times, promotes spawning of the green crabs, can reach an ovigerous rate of 75% or above, and is applicable to production of marine crabs.

Description

technical field [0001] The invention relates to a method for cultivating and cultivating crabs, in particular to a method for promoting spawning of mud crabs and increasing the oviposition rate through manual intervention. Background technique [0002] Obtaining high-quality and abundant egg-bearing crabs is the basis for artificial breeding of blue crabs. The existing ovum-bearing crabs for artificial breeding are generally collected from ponds to cultivate natural ovum-bearing crabs, or select crabs with full gonad development, stock them in nursery ponds, feed them with bait, and lay eggs along with them. The proportion of is very low. The spawning behavior of crabs is affected by physiological and environmental effects, and appropriate conditional stimulation can promote the spawning of parent crabs. At present, blue crabs are generally cultivated by running water, tying up Dao and cutting off eye stalks to improve the survival rate of parent crabs. Dry dew stimulation...

Claims

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Application Information

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IPC IPC(8): A01K61/59
CPCA01K61/59Y02A40/81
Inventor 金中文王扬才吴仲拧柳海
Owner NINGBO ACAD OF OCEAN & FISHERY
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