One-way separation net suitable for catching crayfish and novel efficient crayfish catching net

Abstract

The utility model relates to a one-way separation net suitable for catching crayfish and a novel efficient crayfish catching net. The one-way separation net comprises a sheet net, the sheet net is provided with a first inverted whisker opening and first inverted whiskers communicated with the first inverted whisker opening, the sheet net is further provided with or not provided with a one-way cage, a front end opening of the one-way cage is an inlet, second inverted whiskers are arranged on the inner side of the front end opening, the side wall of the one-way cage is provided with or not provided with a side inlet, and third inverted whiskers are arranged on the inner side of the side inlet. The novel efficient crayfish catching net is provided with a closed fence, barriers for dividing the area in the fence into a plurality of subareas are arranged in the fence, and the fence and the barriers are formed by the one-way separation net. The crayfish catching device is suitable for catching crayfishes or other suitable aquatic animals, the catching efficiency can be improved, the cost can be reduced, the survival rate of the crayfishes and the like can be guaranteed, the crayfish catching time can be properly adjusted, and the coping capacity of farmers to market price fluctuation can be enhanced.

Description

Technical Field

[0001] The utility model relates to a one-way partition net suitable for catching crayfish and a novel high-efficiency crayfish catching net adopting the partition net. Background Art

[0002] In the prior art, a ground cage with inverted whiskers is usually used to catch crayfish. The ground cage is placed in a water body, and crayfish enter the ground cage from the entrance of the ground cage under the lure of bait. Due to the effect of the inverted whiskers, the crayfish can only enter but not exit, so that the crayfish in the ground cage gather more and more and concentrate at the rear of the ground cage (with the entrance as the front). Some ground cages are also provided with a net box at the rear end to increase the holding capacity of the ground cage. For example, Chinese patent document CN115669619A discloses an automatic crayfish catching device, including a PVC hollow pipe, a square shrimp collecting cage and a driving motor. The bottom of both ends of the PVC hollow pipe is equipped with a fixing frame, one end of the PVC hollow pipe is equipped with an end cap, the other end of the PVC hollow pipe is provided with a threaded joint, the inside of the PVC hollow pipe is provided with a piston plug, and the bottom of the PVC hollow pipe is provided with a plurality of shrimp luring holes on both sides, and one end of the PVC hollow pipe is inserted into the shrimp inlet hole on the side of the square shrimp collecting cage. Chinese patent document CN113057147A discloses a lobster fishing device, comprising at least one ground cage, a frame, a net cage and a first inverted whisker, wherein the frame is provided with first through holes corresponding to the number of ground cages, the opening end of the ground cage is connected to the first through hole, the net cage is detachably connected to the frame, the side of the net cage is provided with a second through hole connected to the opening end, the first inverted whisker is provided in the second through hole, the first inverted whisker allows lobsters to pass only from the ground cage to the net cage, when catching lobsters, the lobsters enter the ground cage and crawl from the ground cage into the net cage, the first inverted whisker prevents the lobsters from returning to the ground cage and stays in the net cage. Chinese patent document CN101091472A discloses a shrimp catching method using a shrimp cage. The side of the cage used has a barbel opening and a shrimp taking door, the barbel opening is connected to the barbel, and a bait column is connected inside the cage. The bracket of the cage forms a rectangular parallelepiped, and the bracket is wrapped with a mesh. There are two barbel openings on the end face of one end, and there is a barbel opening and a shrimp taking door on the other end face. There is a barbel pull line on the back of the barbel opening connected to the bracket.

[0003] These existing technologies facilitate the fishing of crayfish and reduce the amount of fishing work, but they still have certain limitations. For example, only crayfish near the entrance of the ground cage can enter the ground cage, the effective fishing range is small, and the efficiency is relatively low. When the fishing area is large, the ground cage needs to be widely distributed, which significantly increases the fishing cost and workload. In addition, after the crayfish enter the net, if the shrimps are not collected in time, they are prone to death due to environmental factors such as crowding and lack of oxygen. Therefore, the shrimp collection time is short, and it is impossible to flexibly choose the shrimp collection time according to the actual situation. Utility Model Content

[0004] The object of the present utility model is to expand the effective fishing area, improve the fishing efficiency, and allow for a relatively flexible selection of the time for harvesting shrimps.

[0005] The technical solution of the present utility model is as follows: a one-way partition net adapted to crayfish fishing, including a net sheet (or net piece), on which a first barb opening (a hole / opening communicating with a first barb) is provided. On the outlet side of the first barb opening, a first barb (a one-way channel made of a net) communicating therewith is provided. The number of the first barb openings is one or more, and the number of the first barbs is the same as the number of the first barb openings.

[0006] Preferably, in the case where the number of the first barb openings is multiple, the multiple first barb openings are arranged at equal intervals at the same height on the net sheet.

[0007] According to actual needs, a one-way cage (or ground cage, or catching cage) may or may not be provided on the net sheet.

[0008] Further, the one-way cage is preferably strip-shaped and may adopt the same or similar basic structure as the ground cage in the prior art. The front port of the one-way cage is the inlet (the inlet end is called the front end), and the rear port is the outlet.

[0009] Further, a second barb matching the front port is provided inside the front port of the one-way cage (inside the cage).

[0010] Further, according to actual needs, side inlets (holes / openings allowing crayfish to pass through) may or may not be provided on the side walls of the one-way cage.

[0011] Further, a third barb matching the side inlet is provided inside the side inlet (inside the cage) of the one-way cage (if provided).

[0012] Further, the outlet end of the one-way cage is connected to the inlet side of the net sheet, and a one-way cage opening (a hole / opening communicating with the outlet of the one-way cage) corresponding to the outlet of the one-way cage is provided on the net sheet.

[0013] Preferably, the side inlets of the one-way cage are provided on one or both sides in the transverse (horizontal) direction of the one-way cage. Multiple side inlets on the same side (if multiple side inlets are provided on the same side) are distributed at intervals along the extending direction of the one-way cage. When multiple side inlets are provided on both sides, the side inlets on both sides are preferably staggered in the extending direction of the one-way cage, and may also be aligned when appropriate.

[0014] Preferably, a fourth barb is provided on the outlet side of the one-way cage opening and is communicated with the one-way cage opening. After the crayfish come out of the one-way cage through the one-way cage outlet and the fourth barb, they cannot return to the one-way cage through the fourth barb and the one-way cage outlet again. Thus, the one-way guiding function of the one-way cage opening and the fourth barb for the crayfish is realized.

[0015] A novel and efficient crayfish fishing net is provided with an enclosed fence (for example, a rectangular fence).

[0016] Furthermore, partition fences for dividing the area inside the fence into several partitions can be provided inside the fence. Both the fence and the partition fences are formed by any one of the one-way partition nets disclosed by the present utility model. At least one of the several partitions separated is a collection area, and usually there is one or more non-collection areas (partitions that are not collection areas). When necessary, there may also be no non-collection areas (that is, all partitions are collection areas). The outlet side (the first barb side) of the one-way partition net used to form the fence faces inward (inside the fence), and the outlet side of the one-way partition net used to form the partition fence faces forward along the corresponding guiding path (the guiding path passing through the one-way partition net) (with the direction towards the collection area on the guiding path as the front).

[0017] Or,

[0018] No partition fence is provided inside the fence, and the area inside the fence is a collection area. The fence is formed by any one of the one-way partition nets disclosed by the present utility model. The outlet side (the first barb side) of the one-way partition net used to form the fence faces inward.

[0019] Preferably, one-way cages are provided on at least part (including all or a part) of the one-way partition nets used to form the fence.

[0020] Preferably, one-way cages are provided on at least part (including all or a part) of the one-way partition nets used to form the partition fences.

[0021] According to actual needs, it is also possible that no one-way cages are provided on all the one-way partition nets used to form the partition fences.

[0022] Furthermore, a centralized crayfish collection box or a space or structure for setting a centralized crayfish collection cage is provided in the collection area, and crayfish can be collected from the collection area through the centralized crayfish collection box or any other suitable means.

[0023] Furthermore, when partition fences are provided, the fence and the partition fences can be provided with several vertical net support rods. The one-way partition nets used to form the fence and the partition fences are connected to their respective corresponding net support rods. When no partition fence is provided, the fence can be provided with several vertical net support rods, and the one-way partition nets used to form the fence are connected to their respective corresponding net support rods.

[0024] For example, a number of bamboo poles used as support poles for the sheet net are arranged at certain intervals along the fences and partitions (if any). The lower ends of the bamboo poles are inserted into the bottom of the pool for fixation. The one-way partition nets are erected and unfolded, and multiple one-way partition nets are connected in sequence to form the required fence and partition (if any) shape. The sheet net and the support pole for the sheet net are connected together at the part where the sheet net is in contact with / adjacent to the support pole for the sheet net (for example, the sheet net and the support pole for the sheet net are tied together at multiple upper and lower positions with ropes), thereby supporting the required fence and partition (if any).

[0025] Edge ropes are provided at both the top edge (upper edge) and the bottom edge of the one-way partition net (sheet net). Generally, the upper and lower edge ropes of the one-way partition net should be fixedly connected to the support pole for the sheet net to improve the connection strength and reliability between the support pole for the sheet net and the sheet net (one-way partition net).

[0026] Support poles for the sheet net can be provided at the horizontal connection part of adjacent sheet nets, and the corresponding side ropes (vertical side ropes) or side parts of the two sheet nets on both sides of the support pole for the sheet net are connected to the support pole for the sheet net, thereby simultaneously realizing the connection between the corresponding sheet net and the support pole for the sheet net and the mutual connection between adjacent sheet nets at the support pole for the sheet net.

[0027] Preferably, a counterweight strip (strip-shaped counterweight, especially a flexible strip-shaped counterweight, such as an iron chain) or a number of counterweight blocks distributed at intervals are provided at the bottom edge (lower edge) of the one-way partition net.

[0028] The counterweight strip or the counterweight blocks can be connected to the lower edge rope of the sheet net.

[0029] Preferably, a horizontal pull rope is provided on the outlet side of the one-way partition net. The horizontal pull rope is parallel to the one-way partition net and has a certain interval. The height of the horizontal pull rope is the same as the outlet height of the first barbed wire on the one-way partition net (the outlet height in the horizontally extended state). The two ends (the two ends in the horizontal direction) of the outlet of the first barbed wire on the one-way partition net are respectively connected to the horizontal pull rope through the traction ropes at each end, so that the first barbed wire is in a horizontally extended state.

[0030] For the one-way partition net provided with a one-way cage, the two ends (the two ends in the horizontal direction) of the outlet of the fourth barbed wire on the one-way partition net are also respectively connected to the horizontal pull rope through the traction ropes at each end, so that the fourth barbed wire is in a horizontally extended state.

[0031] Furthermore, the horizontal pull rope can be provided with a number of erected pull rope support poles, and the pull rope is fixedly connected to the corresponding pull rope support poles.

[0032] The pull rope support poles can also be bamboo poles with their lower ends inserted into the bottom of the pool for fixation.

[0033] The beneficial effects of the present utility model are as follows:

[0034] 1) Since a number of one-way channel openings (the first funnel opening and the first funnel) are provided on the sheet net, the crayfish can enter from only one side of the sheet net to the other side, enabling the one-way transfer and collection of the crayfish.

[0035] 2) Since the outlets of various funnels can all adopt horizontal flat openings, it is beneficial to prevent the crayfish from passing through the funnels reversely from the outlet side of the funnels.

[0036] 3) Since a one-way cage can be configured on the sheet net, when in use, the one-way cage is unfolded, enabling the crayfish far from the sheet net to also be transferred to the other side of the sheet net through the one-way cage, effectively expanding the fishing (collection) range.

[0037] 4) The one-way partition net is flexibly arranged and convenient to operate. It not only has low cost, but also can significantly reduce the number of labor required per mu of shrimp field. Compared with the labor demand of 3 - 5 people per hundred mu in the traditional fishing method, after adopting the present utility model, only 1 - 2 people per hundred mu of labor are required, and the labor cost is reduced by 50% - 70%, being better adapted to large-scale farming;

[0038] 5) Since the space of the collection area is relatively large and a certain density gradient can be formed within the fence with partitions, it is not only suitable for a higher fishing volume, but also can effectively avoid or reduce the death of crayfish caused by overcrowding and lack of oxygen during the fishing process. Practice has proved that even if the crayfish stay in this fishing net for 2 - 3 days, the survival rate can still remain above 98%. Compared with the traditional fishing method, the survival rate is increased by 30% - 50%.

[0039] 6) Since the survival time in the present utility model is relatively long, the farmers can flexibly adjust the shrimp harvesting time within a relatively long time according to the fluctuations of the market price. Especially in the case of obvious market price fluctuations, they can wait for the price to rise before harvesting and selling the shrimp, thereby enhancing the farmers' ability to cope with market risks.

[0040] The present utility model is applicable to capturing crayfish or other suitable aquatic animals, especially for the collection and fishing of aquatic animals in artificial breeding ponds, which is beneficial to improving the fishing efficiency, reducing the cost, ensuring the survival rate of crayfish, etc., and allowing moderate adjustment of the shrimp harvesting time, being beneficial to enhancing the farmers' ability to cope with market price fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is the planar layout (top view) of the present utility model;

[0042] Figure 2 is the top view of the sheet net related to the present utility model;

[0043] Figure 3 is the three-dimensional view of the combination of the sheet net and the one-way cage related to the present utility model;

[0044] Figure 4 is a three-dimensional schematic diagram of the one-way network interface of the present utility model;

[0045] Figure 5 is the front view (inlet direction) of the one-way network interface of the present utility model;

[0046] Figure 6 is the top view of the one-way network interface of the present utility model. Detailed implementation manners

[0047] Refer to Figures 1 to 6 , this new type of efficient crayfish fishing net (or new type of efficient crayfish fishing facility) is used to be set in a crayfish farming area (for example, a shrimp pond) or a fishing area 10 for the gathering of crayfish, etc., to concentrate the crayfish into a gathering area (which can be called a collection area), and the crayfish are collected in the collection area. A fence is constructed using a one-way partition net (abbreviated as a partition net), and within the fence, the required partition fences are constructed using the one-way partition net to form several partitions 12 within the fence. If the area within the fence is small, the partition fences may not be set, and the entire area within the fence is regarded as the collection area. The guiding directions (the directions allowing the one-way passage of crayfish) of the one-way partition nets at each part cooperate with each other to form a crayfish transfer path, which can be called a guiding path. The crayfish outside the fence and entering the fence can gradually transfer along the guiding path towards the collection area 16 until they enter the collection area.

[0048] A number of holes serving as the first reverse barb openings 21 are provided on the sheet net, and reverse barbs (which can be called the first reverse barbs) are provided in cooperation with these holes to allow the crayfish to directly pass through the sheet net through the first reverse barb openings and the first reverse barbs.

[0049] Any suitable existing technology or other suitable technology can be used to set the first reverse barb openings on the sheet net and connect the first reverse barbs corresponding to the first reverse barb openings, so that the inlet of the first reverse barb is aligned with the corresponding first reverse barb opening. After the crayfish on the inlet side of the net pass through the first reverse barb opening and the first reverse barb and enter the outlet side of the sheet net, they cannot return to the inlet side of the sheet net through the first reverse barb, thereby realizing the one-way guiding (one-way transfer) function of the first reverse barb opening and the first reverse barb for the crayfish.

[0050] Determine the guiding directions of each one-way partition net according to the set guiding path to limit the crawfish to only transfer along the guiding path. Since there are a large number of one-way channels (related barbs and holes matching the barbs) on the sheet net and the one-way cage, with a high density, the surrounding crawfish will continuously enter from one side of the partition net to the other side through the one-way channels, and then gradually transfer to the collection area along the set guiding path. When it is necessary to accelerate the transfer speed of the crawfish, the crawfish can be induced to transfer to the collection area by adding bait. The bait can be added in the collection area. When necessary (especially when the capture area is large / many sub-areas, or it is necessary to control the converging time / speed), the crawfish can also be induced to transfer step by step by adding bait in some non-collection areas. First, enter the non-collection area where the bait is placed, and then enter the collection area from the non-collection area. Since the crawfish can only transfer along the set guiding path, after bait is put in any sub-area, only the crawfish in the rear (the direction away from the collection area on the guiding path) sub-area and outside the fence can enter this sub-area.

[0051] Several guiding paths from the area outside the fence to the collection area can be set according to actual needs. For any non-collection area, there should be at least one guiding path passing through this sub-area. The guiding directions of the one-way partition nets on either side of the partition net are set according to the guiding path, so that the crawfish can pass through the partition net according to the guiding direction of the guiding path.

[0052] There can be multiple guiding paths converging in the non-collection area. For example, three paths entering this sub-area and one path exiting this sub-area; or two paths entering this sub-area and two paths exiting this sub-area. There should be only one guiding direction for the one-way partition net between two sub-areas, so that the crawfish can only enter another sub-area from one sub-area according to the set direction. When this partition net is composed of multiple sheet nets, the first barbs on each sheet net are located on the same side of the partition net to ensure that there is only one guiding path passing through the one-way partition net between the two sub-areas.

[0053] According to actual needs, ordinary sheet nets can also be used to form the partition net between two sub-areas to prevent the crawfish in any one of these two sub-areas from entering another sub-area.

[0054] According to actual needs, some areas in the fence and partition can use ordinary sheet nets (sheet nets without one-way channels). What is called in the present utility model (the fence and partition) being composed of one-way partition nets includes the situation of all using one-way partition nets, and also includes the situation of partially using one-way partition nets and partially using ordinary sheet nets.

[0055] Figure 1Shown is a common and effective implementation of the present utility model. A closed rectangular area (rectangular in top view) is enclosed by a one-way partition net. The fence of this rectangular area can be called a rectangular fence. The guiding direction of each side partition net of the fence is from outside the fence into the fence. Crawfish near the fence can pass through the fence into the fence, and crawfish farther away from the fence can also enter the fence from the adjacent one-way cage 30. The length and position of the one-way cage can be set according to actual needs.

[0056] The partition nets inside the rectangular fence are parallel to each other, dividing the area inside the fence into several rectangular partitions arranged longitudinally (in the direction of the fence length). Among them, the partition at one longitudinal end is set as the collection area. This position is at the edge of the fence and can usually be set relatively close to the pond-side road for convenient shrimp collection.

[0057] The guiding direction of each partition net inside the fence is along the longitudinal direction towards the collection area, enabling crawfish entering any partition inside the fence to enter the collection area along the longitudinal direction with a shorter path and forming a density gradient of crawfish between the partitions in the longitudinal direction.

[0058] The collection area can be flexibly set according to actual needs. For example, the collection area can be set in the middle longitudinally to reduce the path length and improve the capture efficiency.

[0059] One or more centralized collection boxes 50 can be set in the collection area to collect shrimp through the centralized collection boxes.

[0060] When necessary, the number of collection areas can also be set to multiple. For example, in the Figure 1 shown partition structure, especially when the fence length is relatively large, the partitions at both ends of the fence can be set as collection areas.

[0061] The partition nets can be flexibly arranged according to actual needs to form a partition distribution adapted to actual needs.

[0062] See Figure 2 and Figure 3 For the sheet net 20 for preparing the one-way partition net, any suitable fishing net in the prior art can be used. The sheet net, the one-way cage 30, and each barbel can be made of high-strength and corrosion-resistant nylon material. The mesh size is appropriate, which can not only prevent crawfish from escaping but also ensure the smooth flow of water.

[0063] The shape of the sheet net can be rectangular, and the length is customized according to the size and layout of the aquaculture pond. The width is generally 3 - 5 meters.

[0064] Several pieces of netting (one-way partition netting) can be connected in sequence to form the lengths required for the fences and partitions, and the fences and partitions are supported by netting support rods 25. The netting support rods can be bamboo poles fixed by inserting them into the mud at the bottom of the pond or any other suitable material. The bamboo poles used as netting support rods can be spaced 1 - 2 meters apart to ensure that the netting can maintain an upright and flat state, and the corresponding parts of the netting are fixedly connected (for example, fixed at multiple points along the support rod through several buckles / clips or tied with ropes) to these bamboo poles. The bottom of the netting is fixed with iron chains or several evenly distributed iron weights for counterweights to prevent the netting from being washed away by the water flow or distorted by crayfish. The weight and length of the iron chains are selected according to the water depth and water flow conditions of the pond.

[0065] Any suitable existing technology or other suitable technology can be used to prepare the one-way cage (for example, the ground cage under the existing technology). The front port (the port far from the netting) 31 of the one-way cage is the inlet, and a reverse barb (which can be called the second reverse barb) matching the front port is arranged inside the front port. The rear end of the one-way cage is open and is connected to the corresponding one-way cage opening on the netting (on the netting forming the edge of the one-way cage opening).

[0066] The cross-section of the one-way cage can be rectangular (in this case, it can be called a long strip square cage, and its overall shape is similar to a long cuboid / square tube). According to the actual situation, the cross-section of the one-way cage can also be circular (in this case, it can be called a long strip round cage, and its overall shape is similar to a long cylinder) or other suitable shapes.

[0067] Side inlets 32 can be arranged on the left and right sides of the one-way cage, and reverse barbs (which can be called the third reverse barbs) matching the side inlets are arranged inside the side inlets.

[0068] The length and cross-sectional area of the one-way cage can be set according to actual needs, and the presence and number of the side inlets of the one-way cage can be set according to actual needs.

[0069] The netting is provided with a one-way cage opening matching the one-way cage. A reverse barb (which can be called the fourth reverse barb) matching the one-way cage opening can be arranged on the outlet side (the same side as the first reverse barb) of the one-way cage opening. The crayfish in the small one-way cage can enter the outlet side area of the netting from the one-way cage outlet and the fourth reverse barb, but cannot reverse through the fourth reverse barb from the outlet side area of the netting and enter the one-way cage.

[0070] Any suitable existing technology or other suitable technology can be used to set the second reverse barb opening inside the front port of the one-way cage so that the inlet of the first reverse barb is aligned with the corresponding second reverse barb opening. The crayfish entering the one-way cage through the front port and the second reverse barb cannot come out from the inlet end of the one-way cage through the second reverse barb again, thereby realizing the one-way guiding effect of the inlet end of the one-way cage on the crayfish.

[0071] Any suitable existing technology or other suitable technology can be adopted to set up a side inlet on the side wall of the one-way cage and connect the third barb corresponding to the side inlet, so that the inlet of the third barb is aligned with the corresponding side inlet. After the crayfish outside the one-way cage enter the cage through the side inlet and the third barb opening, they cannot return outside the cage through the third barb, thereby realizing the one-way guiding effect of the side inlet and the third barb on the crayfish.

[0072] Under normal circumstances, the one-way cage can be 10 meters long, in the shape of a cuboid (rectangular tube), and is in a state perpendicular to the sheet net when fully extended. Since a funnel-shaped barb structure (the second barb and the third barb, if any) is provided inside the inlet (the front port and the side inlet, if any), the inside of the cage is in a one-way movable state. After the crayfish enter the cage, they enter the next area through the outlet as they swim. After multiple transfers, they are finally concentrated in the collection area for fishing (catching shrimp).

[0073] See Figures 4 - 6 , the first barb, the second barb, the third barb and the fourth barb can adopt the same or similar structures. The so-called barb (a general term for barbs such as the first barb, the second barb, the third barb and the fourth barb) 40 is a short one-way channel made of net, and any suitable existing technology or other suitable technology can be adopted. For example, a variable-diameter cylinder (or variable-diameter tube) structure made of net can be adopted, which can be in the shape of a funnel (or cone, or frustum of a cone) or other similar shapes, and the large head is the inlet end.

[0074] The shape and size of each barb can be set according to actual needs. The outlet of the barb should be suitable for the crayfish to pass through but not too large, so as to facilitate the realization of the one-way guiding effect.

[0075] The inlet 41 of the barb can be a round opening, an oval opening, a rectangular opening or any other suitable shape. The outlet 42 of the barb is preferably a horizontal flat opening (a flat opening with a horizontal dimension larger than the vertical dimension), so as to allow the crayfish inside the barb to climb out of the outlet smoothly, while it is difficult for the crayfish outside the barb to enter the barb from the outlet, so as to better realize the one-way guiding effect of the barb.

[0076] The connection method of the barb (for example, the first barb, the fourth barb) and the one-way cage on the sheet net can be based on any suitable existing technology or other suitable technology. For example, the edges of the connection ends of the barb and the sheet net of the one-way cage (the inlet end of the barb, the outlet end of the one-way cage) are connected to the edges of the corresponding holes (barb opening, one-way cage opening) on the sheet net to realize the connection of the barb and the one-way cage at the corresponding positions on the sheet net.

[0077] The connection method of the inverted whiskers (for example, the second inverted whisker, the third inverted whisker) on the corresponding inlet (front port, side inlet) of the one-way cage can also adopt the above-mentioned connection method, connecting the inlet end edge of the inverted whisker with the edge of the corresponding hole (front port or side inlet) on the one-way cage, and the inverted whiskers are located inside the cage, thereby realizing the connection of the inverted whiskers on the one-way cage.

[0078] A horizontal pull rope 46 and a traction rope 44 for pulling the rear end of the inverted whiskers are provided to make the inverted whiskers spread backwards, so as to facilitate the crayfish to pass in the forward direction (along the guiding direction). A plurality of pull rope support rods 45 corresponding to the horizontal pull rope are arranged on the exit side of the fence or partition on the same side, so that the horizontal pull rope is fixedly connected to each corresponding pull rope support rod (for example, the corresponding part of the horizontal pull rope is wound around and fastened to each corresponding pull rope support rod, or the horizontal pull rope is tied to each corresponding pull rope support rod with a rope), and the horizontal pull rope is fixed and in a horizontal (substantially horizontal) state through the pull rope support rod. Two traction ropes are arranged at the rear end of each barbel. The traction ropes are at the same height as the unfolded barbel and are roughly horizontal. One end of the two traction ropes are respectively connected to the two sides of the barbel outlet (the two sides facing horizontally upward), and the other ends are connected to the barbel pull rope. The traction rope should be moderately taut. The specific position at which it is connected to the horizontal pull rope should make the barbel traction rope horizontal and slightly tilted. The tilt angle (the angle between the barbel and the axis of the barbel in the unfolded state) should make the barbel and its outlet in a well-extended state and make the barbel outlet moderately open or able to be stretched by the crayfish, so as to allow the crayfish to pass through the barbel outlet smoothly.

[0079] As a preferred implementation, based on actual needs, some of the sheet mesh support rods can use support rods with higher strength.

[0080] If necessary, some of the rope support rods can also use support rods with higher strength.

[0081] For example, sheet net support rods with higher strength may be provided at the four corners of the fence. In the case of fences, sheet net support rods with higher strength may also be provided at the T-shaped connections and / or cross connections between the fences and the fences, and at the T-shaped connections and / or cross connections between the fences.

[0082] Stronger rope support rods can be arranged inside the four corners of the fence. If necessary, stronger rope support rods can also be arranged at the T-shaped connections and / or cross connections between the ropes.

[0083] The high-strength support rods can be rod-shaped objects with corresponding strength, such as metal profiles such as steel pipes or channel steels. The lower ends of the high-strength support rods can be rammed into the pool bottom to a certain depth or fixed in other appropriate ways. By providing these high-strength support rods, the overall strength and stability can be better guaranteed.

[0084] The shrimp-catching method of the present utility model can be as follows: Select a suitable aquaculture pond or shrimp paddy field. The area of the pond or shrimp paddy field is generally between 30 and 40 mu, the water depth is 0.5 - 1.2 meters, the water quality is clear, and the bottom is flat;

[0085] Install the fishing net: Arrange this kind of shrimp-catching net in the shrimp pond according to the layout in the above technical solution, support it with bamboo poles, and fix the bottom of the net with iron chains;

[0086] Put bait: Put an appropriate amount of bait inside the shrimp-catching net to attract crayfish to enter;

[0087] Start fishing: Regularly check the fishing net. When a certain number of crayfish gather, carry out the fishing (shrimp harvesting) operation. When harvesting shrimp, carefully scoop up the crayfish concentrated in the enclosure net and put them into the transport container;

[0088] Maintenance and cleaning: After fishing, clean and maintain the fishing net, remove sundries and damaged parts, and get ready for the next fishing.

[0089] All the preferred and optional technical means disclosed by the present utility model can be arbitrarily combined to form several different specific implementation manners, except when specifically stated otherwise and when one preferred or optional technical means is a further limitation of another technical means.

Claims

1. One-way separator net adapted for crayfish fishing, including a net sheet, characterized in that The sheet net is provided with a first barb opening, and a first barb communicating with the outlet side of the first barb opening is provided. The number of the first barb openings is one or more, and the number of the first barbs is the same as that of the first barb openings.

2. The one-way partition net according to claim 1, wherein The multiple first barb openings are arranged at equal intervals at the same height of the sheet net.

3. The unidirectional separation net according to claim 1, characterized in that The sheet net is provided with or without a one-way cage. The one-way cage is strip-shaped, with its front port as the inlet and its rear port as the outlet. A second barb matching the front port is provided inside the front port. The side wall of the one-way cage is provided with or without side inlets, and a third barb matching the side inlets is provided inside the side inlets. The outlet end of the one-way cage is connected to the inlet side of the sheet net, and a one-way cage opening corresponding to the outlet of the one-way cage is provided on the sheet net.

4. The unidirectional partition net according to claim 3, wherein The side inlets of the one-way cage are arranged on one or both lateral sides of the one-way cage. Multiple side inlets on the same side are distributed at intervals along the extending direction of the one-way cage. When there are multiple side inlets on both sides, the side inlets on both sides are staggered or aligned in the extending direction of the one-way cage.

5. The one-way partition net according to claim 3, characterized in that A fourth barb communicating with the outlet side of the one-way cage opening is provided.

6. Novel and efficient crayfish fishing net, characterized in that A closed fence is provided. The fence is provided with partitions that divide the area inside the fence into several sub-areas. Both the fence and the partitions are composed of the one-way partition net described in any one of claims 1-5. At least one of the several sub-areas separated is a collection area. Several guiding paths are set from the area outside the fence to the collection area. For any non-collection area, there is at least one guiding path passing through the sub-area, which is used to form the one-way partition net of the fence with the outlet side facing inwards, and the one-way partition net used to form the partition has the outlet side facing forward along the corresponding guiding path; or, there are no partitions inside the fence, and the area inside the fence is the collection area. The fence is composed of the one-way partition net described in any one of claims 1-5, and the outlet side of the one-way partition net used to form the fence faces inwards.

7. The novel and efficient crayfish fishing net according to claim 6, wherein At least part of the one-way partition net used to form the fence is provided with a one-way cage, and at least part of the one-way partition net used to form the partition is provided with a one-way cage.

8. The novel and efficient crayfish fishing net according to claim 6 or 7, characterized in that A centralized shrimp collection box is provided in the collection area, or a space or structure for setting a centralized shrimp cage is provided.

9. The novel and efficient crayfish fishing net according to claim 6 or 7, characterized in that When there are partitions, the fence and the partitions are equipped with several vertical sheet net support rods, and the one-way partition nets used to form the fence and the partitions are connected to their respective corresponding sheet net support rods; when there are no partitions, the fence is equipped with several vertical sheet net support rods, and the one-way partition net used to form the fence is connected to its respective corresponding sheet net support rods.

10. The novel and efficient crayfish fishing net according to claim 6 or 7, characterized in that A horizontal pull rope is provided on the outlet side of the one-way partition net. The horizontal pull rope is parallel to the one-way partition net and has a certain distance. The height of the horizontal pull rope is the same as the outlet height of the first barb on the one-way partition net. The two ends of the outlet of the first barb on the one-way partition net are respectively connected to the horizontal pull rope through the traction ropes at each end, so that the first barb is in an extended state. For the one-way partition net provided with a one-way cage, the two ends of the outlet of the fourth barb on the one-way partition net are respectively connected to the horizontal pull rope through the traction ropes at each end, so that the fourth barb is in an extended state. The horizontal pull rope is equipped with several vertical pull rope support rods, and the pull rope is fixedly connected to each corresponding pull rope support rod.

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