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Method for artificially cultivating soft-shell blue crabs

A technology for artificially cultivating and soft-shell crabs, which is applied in the field of blue crab breeding, can solve problems such as not easy to grow, occupy a large space and area, and have no public classification, so as to speed up the process of shelling, improve utilization rate, and improve survival rate effect

Inactive Publication Date: 2013-03-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical defect in method 1: According to the degree of fatness and thinness of blue crabs, it is divided into several grades, but the specific information of the grades is not disclosed
[0008] The technical defect of method 2: it also does not involve graded cultivation. If it is not the blue crab that shells quickly, it is not easy to grow in a small space. It takes half a month or longer to obtain soft shell crabs, and the entire breeding cycle is long. ,high cost
Although soft-shell crabs can be found in glass tanks in time, if large-scale cultivation is to be carried out, a large number of glass tanks are required, which takes up a lot of space and area. The number of soft-shell crabs cultivated in this way is limited and the scale is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 10‰~25‰, pH value can be 7.6~8.5, dissolved oxygen can be 5mg / L

[0027] The first kind of blue crabs, weighing 100-150g, are kept in crab cages individually, and arranged in groups of crab cages in an area of ​​20m. 2 , In a cement cultivation pond with a depth of more than 1.5m. The temperature of the cultured seawater is 20-23°C, the salinity is 20‰-25‰, the pH value can be 7.6-8, continuously aerate, keep the dissolved oxygen above 5mg / L, and feed low-value shellfish or fresh small For miscellaneous fish and shrimp, change the water 100% every other day to keep the water fresh and clean. During the cultivation period, soak for 2 hours every day in a black barrel or a small pond added with natural exfoliating factor, then soak in calcium hydroxide solution, and then re-transplant into the cultivation pond. According to the blue crab shelling cycle and tidal rhythm, check the crab cages regularly, select and transfer the freshly shelled blue crabs in time,...

Embodiment 2

[0029] The first category of blue crabs, weighing 150-250g, are kept in crab cages individually, and arranged in groups of crab cages in an area of ​​50m. 2 , in a cement cultivation pool with a depth of more than 1.0m. The temperature of the cultured seawater is 23-25°C, the salinity is 15‰-20‰, the pH value can be 7.8-82, continuously aerate, keep the dissolved oxygen above 5mg / L, and feed low-value shellfish or fresh small For miscellaneous fish and shrimp, change the water 100% every other day to keep the water fresh and clean. During the cultivation period, soak for 4 hours every day in a black bucket or a small pond added with natural shelling factor, then soak in calcium hydroxide solution, and then re-transplant into the cultivation pond. According to the blue crab shelling cycle and tidal rhythm, check the crab cages regularly, select and transfer the freshly shelled blue crabs in time, and carry out low-temperature paralysis fresh preservation or frozen preservation...

Embodiment 3

[0031] Type 1 blue crabs, weighing 100-150g, are kept in crab cages alone. Groups of crab cages are stocked in an outdoor earthen pond with an area of ​​6 mu, and the water depth is more than 12m. A pontoon can be built in the earthen pond, and groups of crab cages can be stocked on both sides of the pontoon to facilitate inspection and baiting. The temperature of the cultured seawater is 20-25°C, the salinity is 15‰-25‰, the pH value can be 82-8.5, keep the water color light green, and the dissolved oxygen is above 5mg / L. Feed low-value shellfish or fresh Small miscellaneous fish and shrimp. During the cultivation period, soak for 2 hours in a black barrel added with natural shelling factor every day, then soak in calcium hydroxide solution, and then move it into the earthen pond again. According to the blue crab shelling cycle and tidal rhythm, check the crab cages regularly, select and transfer the freshly shelled blue crabs in time, and carry out low-temperature paralysi...

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Abstract

The invention provides a method for artificially cultivating soft-shell blue crabs, which relates to a method of breeding blue crabs. By using the method, the soft-shell crabs can be obtained quickly and the survival rate of the soft-shell crab can be improved. The method comprises the following steps: dividing the blue crabs into three classes, and choosing the blue crabs in the first and second classes as the cultivated objects of the soft-shell crabs; putting a single blue crab in the first class in a crab pot, stacking and binding 3 to 5 crab pots together to be a group of crab pots, and then putting the groups of crab pots into a cultivating pool for intensive cultivation; during the cultivation period, transferring the whole group of crab pots to a black barrel or a small pond in which a natural shell-removing agent is added to soak every day; putting the crab pots into calcium hydroxide solution to soak and disinfect and promote calcium absorption and shell removal, and then putting the blue crabs subjected to socking into the original cultivating pool again; timely selecting out the blue crabs which just remove shells and transferring, then carrying out low-temperature paralysis fresh preservation or cryopreservation on the selected blue crabs; carrying out mixed group cultivation on the blue crabs in the second class in a cultivating pool, after the state of the blue crab in the second class in the shell removing cycle enters the state of the blue crab in the first class, selecting out and transferring the blue crabs to the crab pots, then cultivating the blue crabs to be the soft-shell crabs.

Description

technical field [0001] The invention relates to a breeding method for blue crabs, in particular to a method for promoting shelling of blue crabs to become soft-shell crabs and improving the survival rate according to the shelling growth characteristics of blue crabs. Background technique [0002] The blue crab (Scylla spp.) has delicious meat and rich nutrition, and is an excellent marine cultured species. Blue crab farming has become an emerging marine industry in Southeast Asia and my country. [0003] Soft-shell blue crabs refer to freshly shelled blue crabs, which are very rare in nature, because the new shells of blue crabs gradually harden after a few hours of shelling. If this golden time is missed, soft shell crabs will become hard shell water crabs and must wait until the next shelling cycle. The special feature of soft-shell crabs is that the whole crab is soft. After cooking, the soft-shell crabs can be eaten together with the shell, and the edible part is 100%....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 叶海辉王桂忠黄辉洋李少菁
Owner XIAMEN UNIV
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