KR101167034B1 - Net for Preventing Cannibalism of Swimming Crab - Google Patents

Abstract

The present invention relates to a blue crab formula prevention network, a plurality of nets are formed at a predetermined interval and a mesh is formed in a breeding tank for breeding hatched larva larvae to form a mesh; A support rope coupled to the top of the net to move the net or to shake off the larvae attached to the net; It includes a weight weight attached to the bottom of the net at a predetermined interval so that the weight is applied so that the net unfolds in the vertical direction, wherein the support rope is fixed to the edge of the breeding tank, the culture water flows in the breeding tank To have. The present invention can prevent the official phenomenon that may occur during the production of blue crab seedlings to produce and discharge a large number of blue crab seedlings, to minimize the initial cost of the production of seedlings by the prevention of the formula, the blue crab as well as other shellfish It is possible to increase the development and production of varieties, to increase the crab resources and to resolve disputes related to the crab resources by mass stocking of crab seedlings, and to increase the income of fishers and to increase the distribution of fishers and stabilize the distribution of fisheries and prices. It is to contribute.

Description

Net for Preventing Cannibalism of Swimming Crab}

The present invention is a device for preventing the blue crab formula (하는 食, eating each other), which affects the survival rate or yield when artificially produced blue crab seedlings (crab blue crab) artificially in the land tank It's about an official barrier that makes it easy to attach to (net).

Blue crabs are crustaceans of the deciduous crab family. It can swim and move, and it is nocturnal and hides in the shallow sand of 20-30 meters of beach during the day and eats at night. The shell is about 8.5cm in size, the width of the shell is about 17.5cm, rhombic, and there are five legs on each side. The distribution area is the west and south seas of Korea, and Japan and China. In winter, they hibernate to deep or distant seas, and from late March, they migrate to shallow areas or to bays for spawning. The spawning season is from June to August.

Since 2003, in order to increase the crab resources and increase the income of fishers, domestically produced and discharged the crab seedlings (crab crab) in Korea, which has resulted in a large increase in the production of blue crabs. However, in the production of blue crab seedlings, the survival rate of blue crab was very low due to the eating phenomenon between the same individuals due to the nature of the shellfish. This formal phenomenon remains an unsolved task.

Conventionally, in order to prevent the official phenomenon of blue crabs, the concentration of aquaculture water for raising or shading to prevent seeing each other, but this was not a systematic and scientifically unclear problem. Normally, blue crabs have about 1 million to 2 million eggs, but the seedlings produced per mother have a low survival rate of about 30,000 or less. Thus, the higher survival and productivity of the seedlings will be improved if more certain formulations can be prevented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the productivity of blue crabs by increasing the survival rate of seedlings, securing blue crab resources, and by discharging them by providing a formal prevention net having a net mesh that can prevent the official phenomenon of blue crab larvae. .

The present invention, in order to achieve the above object, the net is formed in a certain shape of the mesh is formed a plurality of at a predetermined interval and the mesh is formed in the breeding tank to breed hatched crab larvae; A support rope coupled to the top of the net to move the net or to shake off the larvae attached to the net; It includes a weight weight attached to the bottom of the net at a predetermined interval so that the weight is applied so that the net unfolds in the vertical direction, wherein the support rope is fixed to the edge of the breeding tank, the culture water flows in the breeding tank It is characterized by providing a blue crab formula prevention net.

The present invention can be produced and discharged a large number of blue crab seedlings by preventing the official phenomenon that may occur in the production process of the blue crab seedlings by the above-mentioned solving means, it is possible to minimize the initial cost of seedling production by formula prevention, It is possible to increase the development and production of not only blue crab, but also other crustaceans, and to increase the crab resources and solve disputes related to blue crab resources by mass stocking of blue crab seeds, and to increase the income of fishers and fisheries industry by increasing the catch of blue crabs. There is an effect that can contribute to the distribution and price stabilization of.

1 is a front view showing a blue crab formula prevention net according to the present invention.
Figure 2 shows a comparative embodiment according to the present invention, Figure 2a is a photograph showing the breeding tank for producing blue crab seedlings without the installation of the light shielding film and the shielding film, Figure 2b is applied to the official prevention net to produce blue crab seedlings This is a picture of a breeding tank.
3A and 3B are enlarged photographs of comparative examples of FIGS. 2A and 2B.
Figure 4 is a graph showing the production before and after the use of the blue crab formula prevention net of the present invention.

Hereinafter, with reference to the accompanying drawings with respect to the blue crab formula prevention net according to the present invention will be described in detail.

First, the blue crab formula prevention net of the present invention is for mass production of blue crabs, and is installed in a plurality of mesh shapes at regular intervals in a tank for breeding larvae of hatched blue crabs.

The net 10 is installed in plural at regular intervals in the breeding tank for hatching crab larvae. The net 10 is a mesh of a predetermined shape is formed a mesh of a predetermined interval.

 The mesh of the mesh 10 may be round or polygonal, square or rectangular. And the net 10 is preferably a rectangular shape of about 10m X 0.5m horizontally and vertically, depending on the size of the breeding tank 20 may also vary in the size of the net (10). In addition, the mesh of the net 10 may be about 1cm X 1cm horizontally and vertically. Moreover, depending on the shape and size of the mesh serves as a major factor for preventing the formula of blue crab larvae. In particular, the size of the mesh was standardized to 1cm X 1cm horizontally and vertically.

In addition, the mesh 10 is a good synthetic resin material that can be used semi-permanently without easily damaged or corroded material, in particular, the nylon mesh was found to be the most excellent. This is because nylon is a long-term preservation of the mesh and easy to restore the prototype.

The support rope 12 is coupled to the upper end of the net 10, and the support rope 12 is used to move the net 10 or to shake off the larvae attached to the net 10 for harvesting To be combined. The support rope 12 is to be tied to the edge of the breeding tank 20 at the same time as the support of the net 10 to fix the net 10.

Weight 14 is attached to the bottom of the net 10 at regular intervals. The weight 14 is a certain weight is applied so that the net 10 can be deployed in the vertical direction in the breeding tank 20. The weight 14 allows the net 10 to settle down to the bottom surface of the breeding tank 20, so that the net 10 is not easily flown by the flow of aquaculture water. Weight 14 may be applied to a material such as corrosion-resistant metal or non-metal or cement or concrete.

Therefore, both sides of the support rope 12 coupled to the upper end of the net 10 is fixed to the edge of the breeding tank 20, in the breeding tank 20 so that the farming water for the breeding of blue crab larvae has a certain direction flow. Good to do.

The blue crab formula prevention net of the present invention should be formed a mesh suitable for the production of blue crab seedlings, C2 ~ C5, the crab stage of the crab most well-prevented meshes in the horizontal and vertical 1cm X 1cm around, the highest The highest survival rate was over 15 times.

Formal protection nets can be rolled up from the end to reduce volume, making it easier to move and store. Furthermore, unused or finished nets can be used semi-permanently if washed with water. In addition, the nylon net is much higher than the other nets made of larvae adhesion rate, easy to manufacture and inexpensive, it can significantly reduce the production cost of the seed production. Formal crusts can be used as a net for the protection of blue crabs as well as for other crustaceans.

Referring to the graph showing the production before and after the use of the blue crab formula in Figure 4 as a result of experimenting with the production of blue crab for several years using the official barrier of the present invention, the official barrier than the 2003-2005 production without the formula In 2006-2008, production began to double in production.

Referring to Figures 2a and 2b, and Figures 3a and 3b a comparative example of actual production of blue crab seedlings by applying the blue crab formula prevention net, Figure 2a is a 20-300,000 seedlings in a 30m X 15m culture tank Could produce. It is produced in aquaculture tanks with shading nets and aquaculture tanks without shading nets.

However, in Fig. 2b, approximately 1.1 million seedlings were produced in a 30m X 15m sized aquarium using the official guard net. This resulted in more than three times the production of seedlings compared with the absence of the official barrier.

In addition, Figure 3a was able to produce 2,000 in a 10m X 10m sized fish tank, but when the seedlings are produced by installing a formal protection net in the 10m X 10m sized fish tank of Figure 3b approximately 20-300,000 of Yields appeared. This resulted in more than 100 times difference in production depending on the installation of official protection net.

Referring to Table 1, the economic effects of the seedlings produced and discharged during 2005-2008, the survival rate, the survival rate, and the catches were increased by the use of the official barriers.

year output
(Ten) Survival rate
(%) Survival
( Ten thousand ) 1 year later
Catch
(ton) economical
effect
(Billion won) Invention Effect
(Billion won) invention
Whether or not to use Total economic profit 151 2005 200 60% 120 400 80 - × 2006 380 60% 228 760 152 45 ○ 2007 311 60% 186.6 560 112 32 ○ 2008 386 60% 231.6 772 154 74 ○

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who has it will know it easily.

10: net 12: support rope
14: weight 20: breeding tank

Claims (4)

In the breeding tank for hatching blue crab larvae, a plurality of nets are formed in a circular or polygonal mesh with a plurality of meshes formed at regular intervals and a mesh is formed on the upper part of the net to move the nets or shake off the larvae attached to the nets. Combined support rope, the weight is attached to the bottom of the net at a predetermined interval so that the weight is applied so that the net can be deployed in the vertical direction, and both sides of the support rope to the crab formula prevention net fixed to the edge of the breeding tank In
The size of the net which can increase the survival rate of the blue crab larvae is 10m X 0.5m in the length and width, and the mesh of the net is 1cm X 1cm in the width and length, and the mesh is made of nylon for long-term preservation and circular restoration. Made, the weight crab formula preventing net, characterized in that the corrosion-resistant material. delete delete delete

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