CN104222029B - A quick way to catch crabs - Google Patents

Abstract

The invention relates to the field of fishery, and relates to a method and device for quickly catching crabs. The method for quickly catching crabs is to set a net cage above the water surface in a river crab culture pond, and to install an escape prevention device on the upper end of the net cage. The box is divided into the first net cage and the second net cage, and the upper part of the dividing net is provided with a crab flexible smooth plate, and an anti-return flexible smooth plate is arranged between the top of the crab flexible smooth plate and the second net cage; Place some ground cages in the pool, and the crab outlet of the ground cages leads into the first net cage; The device for fast crabbing corresponds to the method for fast crabbing in addition. By adopting the above method and device, not only can crabs be quickly caught, but also female and male river crabs can be well separated.

Description

A quick way to catch crabs

technical field

The invention relates to the field of fishing, in particular to a method and device for quickly catching crabs.

Background technique

River crab, scientifically known as Chinese mitten crab, commonly known as hairy crab and hairy crab, is a special economic species unique to China with a wide distribution. River crabs have a strong ability to adapt to the environment. In the 1960s, artificial breeding and artificial breeding were carried out in many places in the world. At present, river crab is an important aquaculture species in my country.

River crabs have the biological characteristics of reproductive migration. In October, sexually mature river crabs flow downstream from lakes and rivers into the sea, and lay eggs at the junction of salty and fresh water at the estuary. In May, the eggs undergo metamorphosis and become megalopa. Eye larvae develop and metamorphose into crabs as they go up the water, and grow up in rivers and lakes. Sexually mature river crabs go to the sea again to breed offspring, and the cycle goes on and on.

The catching method of river crab mainly contains following several kinds, 1, catches with ground cage, and ground cage is put into culture pond, and river crab enters artificial net after entering ground cage. This method uses a lot of labor and nets, and the male and female crabs are caught without separation.

2. Pick up manually. When the crabs are sexually mature, they start to go up the ridge and pick up manually. This method can only be used for a few days at the peak of migration. After this period, the river crabs will no longer go up the ridge, so this method can no longer be used. Most of the current breeding methods adopt a double anti-escape method to prevent crabs from going up the ridge, which is beneficial to anti-theft. At the same time, the energy consumed by river crabs in water is less than that on land, which is beneficial to river crabs to maintain their weight. This method cannot be used in lakes and large water surface cultivation.

3. Touching the dry pond, drain the pond water, the river crabs will be in the mud of the pond, manually touch, this method is labor-intensive, the labor load is greater, and the death of the river temporary breeding due to mechanical damage will be very large.

Chinese invention patent application CN 103444664A discloses a new type of luminous crab cage, which is connected with a solid cage ring on the inner side of both ends of the steel skeleton body, and a hanging nose is connected to the solid cage ring; the steel skeleton body is circular, The two ends are large and the middle is slightly smaller, and steel wire sheets are wrapped on the circular skeleton on the outside of the steel skeleton body; the two ends of the steel skeleton body are connected with a crab inlet, and the crab inlet extends inward and is connected with a soft beard; on the steel skeleton body The middle part of the body is placed with a luminous fluorescent ball and a bait bag, and the luminous fluorescent ball and the bait bag are connected on the steel skeleton body by the bait bag stay rope. Although this invention attracts river crabs to enter the crab cage by luminescent fluorescent balls and bait bags, it does not separate the male and female river crabs.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and device for quickly catching crabs that save manpower and can separate males and females of river crabs.

In order to solve the above-mentioned technical problems, a kind of fast crab-catching method of the present invention is that a net cage above the water surface is arranged in the river crab culture pond, and an anti-escape device is arranged at the upper end of the net cage, and the net cage is divided into a first net cage and the second net cage, the top of the dividing net is connected with a crab flexible smooth plate, and an anti-return flexible smooth plate is arranged between the top of the crab flexible smooth plate and the second net cage; several ground cages are placed in the river crab culture pond , the crab outlet of the ground cage is passed into the first net cage; then the water pump is placed within the range of 3-8 meters at the crab inlet of the ground cage, and the water pump is flushed to lead river crabs to quickly enter the ground cage net.

The present invention also includes a device for quickly catching crabs by applying the above method, including a water pump placed in the crab culture pond, and a net cage higher than the water surface of the river crab culture pond, and the net cage is divided into a first net cage and a second net cage. Net cage, a number of ground cages are placed in the river crab breeding pond, the crab outlet of the ground cage is connected to the first net cage, and the water pump is placed at the crab inlet of the ground cage; the upper end of the net cage is connected with an anti-escape device, the upper end of the partition net is connected with a flexible smooth plate for dividing crabs, the top of the flexible smooth plate for dividing crabs and the anti-return flexible smooth plate inclined to the second net cage, the clip between the anti-return flexible smooth plate and the partition net Angle is less than 90 °, with the average width of the female crab as the height of parameter setting the flexible smooth plate of the crab; The height of the flexible smooth plate of the described crab is less than or equal to the average width of the female crab, generally the flexible smooth plate height of the crab is 25- 35cm.

Further, the escape prevention device is a flexible smooth plate connected to the upper end of the cage, the flexible smooth plate is inclined to the inside of the cage, and the angle between the flexible smooth plate and the side wall of the cage is less than 90°.

Furthermore, the flexible smooth board is formed by sequentially ringing the hypotenuses of four trapezoidal flexible smooth boards, and the lower bottom edge of each segment of the flexible smooth board is fixedly connected with the upper edge of the net cage.

Furthermore, a column is fixed outside the corner of the net cage in the river crab culture pond, and the corner of the net cage is connected to the column by a pull rope.

After adopting the above-mentioned method and device, according to the biological characteristics of river crabs like top water, water pumps are used to lead river crabs into the ground cage net quickly, and the river crabs in the ground cage net climb into the first cage for temporary storage to improve the catch efficiency; There are individual differences between male and female crabs in ponds, and male crabs have the characteristics of strong climbing ability. Plastic boards are used to set crab boards of appropriate height on the upper part of the inner wall separating the first net cage and the second net cage. The net cage enters the second net cage to separate the female and male river crabs.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of the fast crab-catching device of the present invention.

Fig. 2a is a schematic diagram of the structure on the water surface of the cage of the fast crabbing device of the present invention.

Fig. 2b is a schematic structural view of the flexible smooth plate of the present invention.

Fig. 2c is a structural schematic diagram of the part of separating crabs and preventing male crabs from returning according to the present invention.

Fig. 2d is a schematic diagram of the angle between the flexible smooth plate of the present invention and the side wall of the cage.

Fig. 3 is a schematic structural view of the smooth baffle of the present invention.

Among the figure: 1 is the first net cage, 2 is the second net cage, 4 is a stay rope, 5 is a column, 6 is a flexible smooth plate, 7 is a side wall of the net cage, and 8 is a smooth baffle plate.

301 is a separating net, 302 is a flexible smooth plate for dividing crabs, 601 is a first flexible smooth plate, 602 is a second flexible smooth plate, 603 is a third flexible smooth plate, 604 is a fourth flexible smooth plate, 605 is a hollow area, 606 is an anti-return flexible smooth plate.

Detailed ways

A method for quickly catching crabs in the present invention is to set a net cage above the water surface in the river crab culture pond, and an escape prevention device is arranged at the upper end of the net cage, and the net cage is divided into a first net by a partition net and a crab baffle 3. Case 1 and the second net cage 2, described separating net and dividing crab baffle plate 301 are connected with dividing crab flexible smooth plate 302, described dividing crab flexible smooth plate 302 top and the second net cage are provided with anti-return flexible Smooth plate 606; place some ground cages in the river crab breeding pond, and the crab outlet of the ground cage is passed into the first net cage; then the water pump is placed on the crab inlet of the ground cage to flush with water and lead the river crabs to quickly enter the ground cage net . After the river crab crawls into the ground cage from the ground cage entrance, it will enter the first net cage 1 like this. The walking characteristics of river crabs. The density of river crabs is close to that of water. They can swim with legs in water and crawl on land. The gender characteristics of river crabs, in the same growth environment, male individuals are generally larger than females, and males have greater climbing ability than females. Crab farming is mainly divided into three stages:

The first stage is seed reproduction, and the fertilized eggs of river crabs develop into megalopa after mating.

In the second stage, crab species are cultivated, and megalopa are cultivated into crab species.

In the third stage, adult crabs are cultivated, and the crab species are cultivated into commercial crabs. In the artificial breeding of river crabs, the fishing of crab species and commercial crabs will involve a lot of labor. The sales of commercial crabs must be separated from males and females and sold according to specifications. Utilize the biological characteristic that river crab likes top water, flush water with water pump and lead river crab to enter the ground cage net quickly, the river crab in the ground cage net climbs into net cage 1 for temporary storage, improves catching efficiency. Because the first net cage 1 and the second net cage 2 upper ends are provided with anti-escape device, so river crab just can't escape after entering net cage from ground cage. In addition, utilizing the different characteristics of male crabs and female crabs in climbing ability, the male crabs will climb up the dividing net crab baffle 3 from the first net cage 1 and enter the second net cage 2, while part of the crab baffles on the dividing net 3 and the second net cage are provided with an anti-return flexible smooth plate 6, and the male crabs entering the net cage 2 cannot return in the first net cage 1 again, which can be more convenient for male crabs and female crabs to be sold separately.

As shown in Fig. 1 and Fig. 2a, the present invention also includes a device for quickly catching crabs by applying the above-mentioned method, including a water pump placed in the river crab culture pond, and a net cage higher than the water surface of the river crab culture pond, and the net cage is composed of Mesh cage side wall 7 encloses and forms, and in order to better prevent river crab from climbing out in the cage, the cage upper end of the present invention is provided with anti-escape device. Column 5 is fixed on the outside of the net cage corner in the described river crab breeding pond, and the corners of the first net cage and the second net cage are connected with column 5 by stay rope 4, so that the shape of the net cage is well formed by stay rope. Fixing, the present embodiment fixes the shape of the net cage as a rectangle.

As shown in Fig. 2a and Fig. 2c, described net cage is separated into the first net cage 1 and the second net cage 2 by the separating net 3 above water surface, is connected with dividing crab flexible smooth plate 302 on dividing net 3, divides The height of the flexible and smooth plate 302 of the crab is suitable for the foot width of the male crab, and the height H is 25-35cm. As shown in Fig. 2a and Fig. 2c, in order to prevent male crabs from climbing into the second net cage 2 from the first net cage 1 and then crawling back, the upper end of the partition net 3 is connected with an anti-return trap inclined towards the second net cage 2. The flexible smooth plate 606, the included angle between the anti-return flexible smooth plate 606 and the partition net 3 is β, and β is less than 90°. When the male crab climbs to the upper end of the partition net 3, it will slide into the second net cage along the anti-return flexible smooth plate 606, and when the male crab in the second net cage climbs upwards along the partition net 3, it will be protected by the anti-return flexible smooth plate 606. The smooth plate 606 blocks and cannot cross the separating net 3 . Some ground cages are placed in the described river crab culture pond, and the crab outlet of the ground cage is passed into the first net cage 1, and the water pump is placed on the crab inlet of the ground cage, so that when the water pump draws water, because the river crab likes to push water, river crabs will climb into the crab mouth of the ground cage, and then enter the first net cage 1 along the ground cage from the crab outlet of the ground cage. Because the male crab has a stronger climbing ability, the male crab will pass through the crab baffle plate 3 and enter the second net cage 2, so that the male crab and the female crab are distinguished, and the separation rate can reach 80%. This saves 40% of labor and saves costs.

Further, as shown in Fig. 2a and Fig. 2b, the escape prevention device in this embodiment is a flexible smooth plate 6 connected to the upper ends of the first net cage 1 and the second net cage 2. Since the shape of the net cage is determined as a rectangle, the flexible smooth plate 6 of the present embodiment includes the first flexible smooth plate 601, the second flexible smooth plate 602, the third flexible smooth plate 603, and the fourth flexible smooth plate 604; The hypotenuses of the four trapezoidal flexible smooth plates are ringed in turn to form a flexible smooth plate 6, which includes a first flexible smooth plate 601, a second flexible smooth plate 602, a third flexible smooth plate 603, and a fourth flexible smooth plate 604 to form a ring. Hollow area 605 . The lower edge of each section of the flexible smooth plate is suitable for the upper edge of the first net cage and the second net cage, the first flexible smooth plate 601, the second flexible smooth plate 602, the third flexible smooth plate 603, the second flexible smooth plate The bottom edges of the four flexible smooth plates 604 are connected with the upper edges of the first net cage 1 and the second net cage 2 . Described each segment of flexible smooth board is inclined to the inside of the first net cage and the second net cage, and the included angle between each segment of flexible smooth board and the side walls of the first net cage and the second net cage is less than 90 degrees. As shown in Figure 2d, the included angle between the first flexible smooth plate 601 and the cage side wall 7 is θ among the figure, and θ is less than 90 degrees, and by analogy, the angles between other flexible smooth plates and the cage side wall 7 are also Less than 90 degrees. The dotted line in the figure is the crawling track of the crab. When the crab climbs up to the flexible smooth plate 601 along the side wall 7 of the net cage, since θ is less than 90 degrees, the flexible smooth plate 601 tilts downward, and the crab will fall into the net cage again. In this way, it is more effective to prevent river crabs from climbing out of the cage.

Of course, the escape device of the present invention can also be the smooth baffle plate 8 vertically fixed on the upper end of the cage side wall as shown in Figure 3, and such transformations all fall within the protection scope of the present invention.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to the embodiments without departing from the principle and essence of the present invention. The scope of protection is limited only by the appended claims.

Claims (1)

1. a kind of method of quick crabbing, it is characterised in that: be provided with quick Crabbing device in river crab culture pond；It is supported in river crab It grows and places several cages in pond, the crab outlet of the cage is passed through the first net cage；Then water pump is placed on the entering at crab mouthful of cage Cage net is rapidly entered with water pump bath irrigation channel crab；

The quick Crabbing device includes the water pump being placed in river crab culture pond, further includes being higher by the river crab culture pond water surface Net cage, the net cage are divided into the first net cage and the second net cage；The net cage upper end is connected with anti-release apparatus, separate mesh upper end It is connected with a point crab flexibility smooth plate, it is anti-to return flexible smooth plate setting and dividing at the top of crab flexibility smooth plate and to the second net cage introversion Tiltedly, the anti-angle for returning flexible smooth plate and separate mesh is less than 90 °；

Divide the height of crab flexibility smooth plate using the mean breadth of female crab as parameter setting；The height for dividing crab flexibility smooth plate Less than or equal to the mean breadth of female crab；The anti-release apparatus is the flexible smooth plate for being connected to net cage upper end, the flexible light Slide plate is to inclination on the inside of net cage, and the angle between the flexibility smooth plate and net cage side wall is less than 90 °；It is described flexibility smooth plate by Successively ring connects the bevel edge of four sections of trapezoidal flexible smooth plates, and the bottom of every section of flexible smooth plate and the upper end edge of net cage are solid Fixed connection；Column is fixed in the river crab culture pond on the outside of net cage corner, the net cage corner is connected by drawstring with column It connects.