阅读说明：本技术 一种基于吊养的青蟹膏蟹冬季暂养方法 (Suspended-culture-based method for temporarily culturing blue crab cream crabs in winter ) 是由 董伟仁 舒妙安 周忆莲 李博 于 2020-05-27 设计创作，主要内容包括：本发明涉及一种基于吊养的青蟹膏蟹冬季暂养方法,基于青蟹养殖池进行暂养,青蟹养殖池的底部离池壁3-6米挖设有环沟,环沟作为排泄物及饵料残余物聚集地；冬季暂养方法包括以下步骤：S1、挑选附肢健全、活力好的青蟹膏蟹；S2、采用绑扎带的第一端将单只青蟹膏蟹的两只螯足捆绑结实,绑扎带的第二端固定在青蟹养殖池的外围平台上；青蟹膏蟹沿青蟹养殖池四周分布的环沟摆放以进行暂养；当冬季降温时,青蟹膏蟹自行向环沟的深处迁移。本发明利用青蟹养殖池的环沟,环沟底部离水面最深,其水温随天气温度影响小；由于绑扎带只束缚螯足,降温时让青蟹膏蟹自行往环沟深处迁移,避免寒潮冻伤或冻死青蟹；在回捕时,只需将绑扎带回收,收捕方便。(The invention relates to a method for temporarily breeding blue crab cream crabs in winter based on suspended culture, which is based on the temporary culture of a blue crab culture pond, wherein a circular ditch is dug at the bottom of the blue crab culture pond 3-6 meters away from the pond wall and is used as an excrement and bait residue gathering place; the winter temporary rearing method comprises the following steps: s1, selecting green crab cream crabs with healthy appendages and good vitality; s2, binding two chela feet of a single blue crab cream crab firmly by adopting a first end of a binding belt, and fixing a second end of the binding belt on a peripheral platform of the blue crab culture pond; placing the green crab cream crabs along circular ditches distributed around the green crab culture pond for temporary culture; when the temperature is reduced in winter, the blue crab cream crabs automatically migrate to the deep part of the circular ditch. The invention utilizes the annular ditch of the blue crab culture pond, the bottom of the annular ditch is deepest from the water surface, and the influence of the water temperature along with the weather temperature is small; because the binding belts only bind the chelae, the green crab cream crabs automatically migrate to the deep part of the circular ditch during cooling, and the cold tide frostbite or the freeze death of the green crabs is avoided; when the binding belt is recaptured, only the binding belt needs to be recycled, and the recapture is convenient.)

1. A method for temporarily breeding blue crab cream crabs in winter based on suspended culture is characterized in that the blue crab culture pond is used for temporarily breeding blue crabs, a circular ditch is dug at the bottom of the blue crab culture pond 3-6 meters away from the pond wall, and the circular ditch is used as a place for accumulating excrement and bait residues; the winter temporary rearing method comprises the following steps:

s1, selecting green crab cream crabs with healthy appendages and good vitality;

s2, binding two chela feet of a single blue crab cream crab firmly by adopting a first end of a binding belt, and fixing a second end of the binding belt on a peripheral platform of the blue crab culture pond; placing the green crab cream crabs along circular ditches distributed around the green crab culture pond for temporary culture; when the temperature is reduced in winter, the blue crab cream crabs automatically migrate to the deep part of the circular ditch.

2. The suspended-culture-based temporary culture method for the cream crabs in winter according to claim 1, wherein the annular ditch of the blue crab culture pond divides the bottom of the culture pond into a middle culture platform and a peripheral culture platform, the outer side of the peripheral culture platform is a pond ridge, and the inner area surrounded by the pond ridge is a blue crab culture space.

3. The suspended culture-based mud crab temporary culture method in winter as claimed in claim 2, wherein the surrounding cultivation platform is provided with fixing rods at predetermined intervals, and the fixing rods are used for fixedly installing the second end of the binding belt.

4. The suspended culture-based temporary culture method for the mud crab in winter as claimed in claim 3, wherein the cultivation pond for the mud crab is rectangular in structure, with a length of 120-150 m, a width of 110-130 m and a water depth of 2.5-3.5 m.

5. The suspended culture-based mud crab cream winter temporary culture method as claimed in claim 4, wherein the width of the circular trench is 4-6 m and the depth is 1.5-2 m.

6. The suspended culture-based mud crab cream winter temporary culture method as claimed in claim 5, wherein the length of the binding belt is 3-5 m, and the predetermined distance is 4-5 m.

7. The suspended culture-based mud crab winter temporary culture method as claimed in claim 1, wherein the binding bands are hemp ropes, cotton ropes or elastic ropes.

8. The suspended culture-based mud crab cream winter temporary culture method according to claim 1, wherein after the step S2, the method further comprises:

and S3, raising the water level of the blue crab culture pond to the highest water level before the cold air comes.

9. The method as claimed in claim 8, wherein the cold air reduces the temperature of water to below 15 ℃.

10. The method for temporarily rearing the mud crab cream crabs in winter according to claim 1, wherein the crab cream crabs are not fed or changed with water during the temporary rearing.

Technical Field

The invention belongs to the technical field of blue crab breeding, and particularly relates to a suspended breeding-based method for temporarily breeding blue crab cream crabs in winter.

Background

Scylla paramamosain (Scylla paramamosain), commonly called blue crab, is delicious in taste and rich in nutrition, is a famous and precious marine crab culture variety with important economic value in China, and is also a marine culture crab with the largest yield in China. In recent years, the green crab breeding industry in China is developed rapidly, the green crab breeding yield is 15.8 million tons, the yield value is as high as 260 hundred million, the green crab breeding method becomes the agricultural support industry in various places along the coast in China, and great contribution is made to increasing income of farmers.

Under the natural condition, when the water temperature of the blue crabs is reduced to below 15 ℃ in winter, the blue crabs dig holes to live through the winter, so that farmers are difficult to catch the blue crabs, and local blue crabs cannot supply markets with vigorous demands during the spring festival. Therefore, farmers generally gradually catch and market water when the water temperature is higher in 10-11 months, but the harvesting time of the blue crabs is too concentrated, the sale price is lower, the profit margin of the farmers is seriously compressed, and the breeding benefit is seriously influenced.

By temporarily breeding the blue crabs in winter, avoiding the period of coming into the market in autumn in a large amount, and selling the blue crabs before the spring festival, the problem of low selling price in autumn can be relieved, the economic benefit brought by peak-staggering selling can be increased, and the method has important significance for promoting the income increase of farmers. The temporary culture of the green crab commodity crabs, particularly the cream crabs, has the characteristics of short time and great benefit. However, the temporary blue crab culture method adopted at present generally puts the blue crabs in a cement pool for temporary culture management, and is generally only suitable for temporary culture for about 1 month, the time is long, and the survival rate is reduced even the temporary culture can not be carried out until the spring festival. Other methods such as temporary rearing methods using rearing cages, crab apartments, crab boxes and the like are greatly limited by temporary rearing fields, the rearing area is limited, the temporary rearing cost is high, or the method has the disadvantage of poor resistance to sudden weather changes, and the survival rate is difficult to guarantee. Therefore, how to improve the winter temporary culture method of the green crab cream crabs and improve the temporary culture survival rate and the economic benefit becomes a key problem which needs to be solved urgently.

Disclosure of Invention

Based on the above disadvantages and shortcomings of the prior art, it is an object of the present invention to solve at least one or more of the above problems of the prior art, in other words, to provide a method for temporarily raising crabs based on suspended cultured crab cream in winter which satisfies one or more of the above needs.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for temporarily breeding blue crab cream crabs in winter based on suspended culture is characterized in that the blue crab culture pond is used for temporarily breeding blue crabs, a circular ditch is dug at the bottom of the blue crab culture pond 3-6 meters away from the pond wall, and the circular ditch is used as a place for accumulating excrement and bait residues; the winter temporary rearing method comprises the following steps:

s1, selecting green crab cream crabs with healthy appendages and good vitality;

s2, binding two chela feet of a single blue crab cream crab firmly by adopting a first end of a binding belt, and fixing a second end of the binding belt on a peripheral platform of the blue crab culture pond; placing the green crab cream crabs along circular ditches distributed around the green crab culture pond for temporary culture; when the temperature is reduced in winter, the blue crab cream crabs automatically migrate to the deep part of the circular ditch.

As a preferred scheme, the bottom of the cultivation pond is divided into a middle cultivation platform and a peripheral cultivation platform by the annular ditch of the blue crab cultivation pond, the outer side of the peripheral cultivation platform is a pond ridge, and the inner area surrounded by the pond ridge is a blue crab cultivation space.

As the preferred scheme, the cultivation platforms on the periphery are provided with fixing rods at intervals of a preset distance, and the fixing rods are used for fixedly mounting the second ends of the binding belts.

As a preferred scheme, the blue crab culture pond is of a square structure, the length of the pond is 120-.

Preferably, the width of the annular groove is 4-6 m, and the depth is 1.5-2 m.

Preferably, the length of the binding band is 3-5 m, and the predetermined distance is 4-5 m.

Preferably, the binding band is a hemp rope, a cotton rope or an elastic rope.

Preferably, after step S2, the winter temporary rearing method further includes:

and S3, raising the water level of the blue crab culture pond to the highest water level before the cold air comes. Prevent the green crab cream crabs from being frostbitten by low temperature during the temporary rearing.

Preferably, the cold air reduces the temperature of the water to below 15 ℃.

Preferably, the temporary culture period is not fed and water is not changed.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention utilizes the original annular ditch in the blue crab culture pond, the bottom of the annular ditch is deepest from the water surface, and the influence of the water temperature along with the weather temperature is small; because the binding belts only bind the chelae of the blue crabs, the normal movement of the blue crabs is not influenced, the blue crabs automatically migrate to the deep part of the circular ditch when the temperature is reduced, and the cold tide is prevented from frostbite or the blue crabs are frozen to death; when the binding belt is recaptured, the binding belt only needs to be recovered, and the capture is convenient;

(2) only the chela is bound, the step foot is not bound, thus not only avoiding fighting each other, but also ensuring self-walking, and having high survival rate and low disability rate;

(3) the conventional temporary culture method needs to build a temporary culture pond, needs heating and heat preservation and has high cost; the invention is suitable for all blue crab culture ponds, and the culturists can realize temporary culture in the original blue crab culture pond, thereby having wide audience and great popularization value;

(4) the feed is not fed during the temporary culture period, water is not changed, the feed cost is avoided, the cost is low, and the application prospect is wide;

(5) the survival rate of the temporary culture of the green crab cream crabs is high, the survival rate of the green crabs can reach 100 percent by sampling detection of the temporary culture method for 30 days of temporary culture, the survival rate of the green crabs can reach 92.2 to 98.3 percent by temporary culture for 60 days, the peak-off marketing of the green crab cream crabs is realized, and the economic benefit is good.

Drawings

FIG. 1 is a schematic structural view of a blue crab culture pond and a fixing rod according to an embodiment of the present invention;

fig. 2 is a plan layout view of the blue crab culture pond according to the embodiment of the invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.

The suspended culture-based blue crab cream crab winter temporary culture method provided by the embodiment of the invention is based on the original blue crab culture pond of the blue crab cream crab. The temporary rearing method solves the problems that the existing temporary rearing method needs a specific field and additional facilities, needs to transport the blue crabs, has large human input and high rearing cost, and cannot be popularized in a large range.

Specifically, as shown in fig. 1 and 2, the blue crab culture pond comprises an outer pond ridge 1 and an inner culture platform, and the culture platform and the pond ridge form a culture space for the blue crab cream crabs.

Wherein, a circular ditch 3 is dug in a position 3-6 meters away from the wall of the green crab culture pond, the circular ditch divides the culture platform at the bottom of the culture pond into a middle culture platform 21 and peripheral culture platforms 22, the outer side of the peripheral culture platforms is a pond ridge 1, and the inner area enclosed by the pond ridges is a green crab culture space. The fixing rods 4 are arranged on the surrounding cultivation platforms 22 at intervals of a preset distance, and the fixing rods 4 are used for fixedly installing binding belts. The fixing rod 4 is preferably a bamboo rod, but not limited to a bamboo rod, as long as it can fix the left and right rods.

The technical solution of the present invention will be described in detail by specific examples.