Device for stopping young shrimps from returning to pond
By installing an elevator-lowering isolation net on the slope protection of the breeding pond, the problem of uncontrollable crayfish breeding density is solved, and the benefits and water quality control of mixed shrimp and crab farming are improved, reducing breeding costs.
Patent Information
- Application Number
- CN202420921418.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-29
AI Technical Summary
In the existing mixed-raised shrimp and crab farming model, crayfish farming has problems of interspecies competition caused by the high cost of purchasing shrimp seedlings, uncontrollable breeding density and cave habits, which affects the mixed-raised shrimp and crab farming benefits.
A barrier device for holding shrimps back to the pond was designed, including installing an isolation net on the slope protection of the breeding pond. The isolation net can be lifted and lowered, and is firmly connected to the slope protection through a support mechanism. The mesh is no less than 30 mesh, which is suitable for the life of crayfish. Features, convenient for operation and maintenance.
The density control of crayfish is achieved, interspecies competition is avoided, the benefits of mixed shrimp and crab farming and water quality control capabilities are improved, and the breeding cost is reduced.
Smart Images
Figure CN222170927U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to aquaculture pond engineering technology, in particular to a device for blocking shrimps from returning to the pond, which is suitable for mixed breeding ponds for aquatic crustaceans such as river crabs and crayfish. Background Art
[0002] As an environmentally friendly breeding model, the ecological polyculture model of aquatic animals improves breeding benefits by increasing the effective utilization rate of water bodies, and is the direction of aquaculture development. Chinese mitten crab (hereinafter referred to as river crab) and Procambarus clarkii (hereinafter referred to as crayfish) are important economic aquatic products in my country. The development of ecological polyculture of the two can not only make full use of bait resources, but also promote the transformation of traditional breeding models to modern breeding models. In the current shrimp and crab polyculture process, crayfish breeding is carried out by releasing crayfish fry or retaining seed shrimp in the original pond for self-breeding. The main disadvantages of these two methods include:
[0003] 1. The release of shrimp fry requires purchasing shrimp fry from outside, which increases the breeding cost, and the release time is restricted by the market supply time.
[0004] 2. Crayfish have the habit of digging holes. The depth of the holes is 50 to 80 cm from the bottom of the pond. Their habitat changes with the seasons. When the water temperature rises in spring, crayfish mostly move in shallow water. In summer, when the water temperature is higher than 30℃, they will hide in deep water or caves to avoid the heat. In winter, when the water temperature is lower than 10℃, they will dig holes to hibernate. [1,2] .
[0005] Due to the ecological habits of crayfish, whether it is purchased shrimp seedlings or retained in the original pond for self-breeding, it is not easy to clean the crayfish left in the holes on the bank of the pond when the pond is cleaned after the first year of breeding. After the water level rises in March and April of the following year, the crayfish in the holes come out of the holes and swim into the breeding pond. At this time, most of the crayfish from last year have mated and are carrying eggs, resulting in multiple generations of crayfish living together in the pond. The breeding density is uncontrollable and easily exceeds the breeding capacity of the pond. The inter-species competition pressure is relatively large, thus affecting the comprehensive breeding benefits of shrimp and crab mixed breeding. [3,4] .
[0006] [1] Tang Jianqing, Song Shenglei, Pan Jianlin, et al. Selectivity of Procambarus clarkii to several artificial caves[J]. Fisheries Science, 2004 (05): 26 - 28.
[0007] [2] Liu Qigen, Li Yingsen, Chen Lansun. Biology of Procambarus clarkii[J]. Fisheries Science and Technology Information, 2008(01): 21 - 23.
[0008] [3] Wang Zhou, Wang Jianguo, Wang Quan, et al. Effects of co-culture density on growth characteristics and aquaculture benefits of Chinese mitten crab and red claw crayfish[J]. Guizhou Agricultural Sciences, 2023, 51(01): 42 - 50.
[0009] [4] Tu Wen. Study on the fighting behavior of Chinese mitten crab and Procambarus clarkii under different co-culture conditions[D]. Shanghai Ocean University, 2023.
[0010] In the prior art, the authorization announcement number CN218959802U is "a kind of fishery scale breeding control device", which includes a woven net; a reeling mechanism is arranged on the woven net, and the reeling mechanism includes a vertically arranged shaft rod, a chassis is rotatably installed at the bottom end of the shaft rod, a plug rod is vertically fixed on the lower surface of the chassis, a top plate is horizontally fixed on the top end of the shaft rod, a rotating handle is vertically installed on one end of the upper surface of the top plate, an auxiliary handle is vertically rotatably installed in the middle of the upper surface of the top plate, and a gusset plate is vertically inlaid on the side wall of the shaft rod. This device is more suitable for installation on the bottom of a relatively flat breeding pond. Summary of the invention
[0011] In view of the above problems, the present invention proposes a device for preventing shrimps with juveniles from returning to the pond. The device includes a breeding pond and an isolation net. The isolation net is located at a suitable position in the breeding pond and is designed with an easy-to-operate lifting structure, so that farmers can easily lift and lower the isolation net to prevent shrimps with juveniles from returning to the pond and control the capacity of shrimps and crabs in the pond, so as to effectively carry out breeding operations such as precise feeding and water quality control.
[0012] The device is specifically a device for preventing shrimps from returning to the pond, comprising a breeding pond and an isolation net; a slope protection is provided between the pond stem and the bottom of the breeding pond, and the device is characterized in that an isolation net is installed around the bottom of the pond, the isolation net is vertically installed on the slope protection, and the bottom edge of the isolation net is 30 cm to 40 cm higher than the bottom of the pond, and the height of the isolation net is not less than 50 cm;
[0013] The isolation net is divided into a plurality of units, each of which is adjacent to the other in sequence; any unit includes a net body and a support mechanism, and the net body is connected to the support mechanism in a liftable manner;
[0014] The support mechanism includes two mutually parallel pillars, the bottoms of the two pillars are connected by a horizontal bar, and the two pillars have longitudinal slide grooves on the opposite sides; the two sides of the net body are slidably connected in the slide grooves; the bottom edge of the net body cooperates with the horizontal bar;
[0015] The bottom end of the pillar is connected with a vertical downward ground nail, and the bottom end of the pillar is also connected with a downward oblique side support, and the angle between the side support and the pillar corresponds to the angle of the slope protection; the ground nail is inserted into the slope protection, and the side support is supported on the surface of the slope protection;
[0016] The bottom edge of the horizontal bar is sharp and embedded in the slope protection.
[0017] The soil of the slope protection is harder than the silt at the bottom of the pond. In addition, the slope protection is inclined, so the structure connecting the support mechanism to the slope protection must be specially designed so that the support mechanism can be securely connected to the slope protection. In this solution, in addition to installing ground nails at the bottom of the two pillars, a sharp bottom edge is designed at the bottom of the horizontal bar to facilitate insertion into the slope protection. For a unit, the three supporting parts are all inserted into the slope protection, and the structure is very reliable. At the same time, the two adjacent units are only adjacent and the gap is as small as possible, rather than a connecting structure. If an individual unit falls over, it will not affect other units, and only the fallen unit needs to be repaired.
[0018] In order to facilitate user operation, the network body is designed as follows:
[0019] One structure is: the net body is wound on a reel, the top edge of the net body is connected to the reel, the bottom edge of the net body is connected to a horizontal pull rod, a hook is provided in the middle of the pull rod, and a hook ring corresponding to the hook is provided on the horizontal bar;
[0020] The reel is mounted on top of a pair of pillars. When the isolation net is not in use, the net body is rolled up.
[0021] Another structure is: a rectangular frame is connected to the outer edge of the net body, and the rectangular frame is slidably connected in the slide grooves of a pair of pillars from top to bottom. When the isolation net is not in use, the rectangular frame is pulled out and stored.
[0022] In order to further improve the reliability of the supporting structure, the following improvements are made:
[0023] One structure is: the side support is strip-shaped, and the bottom surface of the strip-shaped side support is connected with a ground nail facing vertically downward.
[0024] Another structure is characterized in that the side support is plate-shaped, and the bottom surface of the plate-shaped side support is connected with a plurality of spines, and the spines are vertically downward.
[0025] In order to be suitable for crayfish farming, the mesh size of the net should not be less than 30 meshes.
[0026] Compared with the prior art, the invention is suitable for the life history characteristics of crayfish and the characteristics of breeding ponds, and is easy to operate, practical and reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is a plan view of the device for blocking the return of shrimp to the pond;
[0028] Figure 2 This is a cross-sectional schematic diagram of the blocking device for carrying shrimps back to the pond;
[0029] Figure 3a It is a schematic diagram of the structure of a unit;
[0030] Figure 3b is a side view of a pillar ( Figure 3a right perspective);
[0031] Figure 4 This is a schematic diagram of the mesh body in the state of being put down, showing the first implementation structure of the mesh body;
[0032] Figure 5 It is a schematic diagram of a mesh body and a rectangular frame of a second implementation structure of the mesh body;
[0033] Figure 6 This is a schematic diagram of the second implementation structure of the side support ( Figure 3b right perspective);
[0034] In the figure: aquaculture pond 1, isolation net 2, pond stem 3, pond bottom 4, slope protection 5, net body 6, pillar 7, horizontal bar 8, slide 9, ground nail 10, side support 11, reel 12, pull rod 13, hook 14, rectangular frame 15, thorn 16, hook ring 17. DETAILED DESCRIPTION
[0035] The invention is further described below in conjunction with the accompanying drawings and specific implementation methods.
[0036] refer to Figure 1 and Figure 2 A device for preventing shrimps from returning to a pond with young, comprising a breeding pond 1 and an isolation net 2; a slope protection 5 is provided between a pond stalk 3 and a pond bottom 4 of the breeding pond. An isolation net is installed around the pond bottom, the isolation net is vertically installed on the slope protection, and the bottom edge of the isolation net is 30 cm to 40 cm higher than the pond bottom, and the height of the isolation net is not less than 50 cm.
[0037] The isolation net is divided into multiple units, and each unit is adjacent to each other end to end, that is, two adjacent units are only adjacent and the gap is not large enough for crayfish to pass through, rather than being in a connected structure state.
[0038] Further references Figure 3a and Figure 3b Any unit includes a net body 6 and a support mechanism, the net body 6 is connected to the support mechanism in a liftable manner; the support mechanism includes two mutually parallel pillars 7, the bottoms of the two pillars 7 are connected by a horizontal bar 8, and the two pillars have longitudinal slide grooves 7 on the opposite sides; the two sides of the net body are slidably connected in the slide grooves; the bottom edge of the net body 6 cooperates with the horizontal bar 8;
[0039] The bottom end of the pillar 7 is connected to a ground nail 10 pointing vertically downward, and the bottom end of the pillar is also connected to a side support 11 pointing obliquely downward. The angle between the side support and the pillar corresponds to the angle of the slope protection; the ground nail is inserted into the slope protection, and the side support is supported on the surface of the slope protection; the bottom edge of the horizontal bar is sharp and buried in the slope protection.
[0040] Further references Figure 4The first implementation structure of the net body is as follows: the net body 6 is wound on a reel 12, the top edge of the net body is connected to the reel, the bottom edge of the net body is connected to a horizontal pull rod 13, a hook 14 is provided in the middle of the pull rod, and a hook ring 17 corresponding to the hook is provided on the horizontal bar; the reel 12 is installed on the top of a pair of pillars 7. Both ends of the reel are connected to the top of the two paired pillars through a bearing device.
[0041] Further references Figure 3a and Figure 5 The second implementation structure of the net body is: the outer edge of the net body 6 is connected with a rectangular frame 15, and the rectangular frame is slidably connected from top to bottom in the sliding grooves of a pair of pillars.
[0042] Further references Figure 3b The first implementation structure of the side support is: the side support 11 is strip-shaped, and the bottom surface of the strip-shaped side support is connected with a vertical downward ground nail 10.
[0043] Further references Figure 6 The second implementation structure of the side support is as follows: the side support 11 is plate-shaped, and a plurality of spines 16 are connected to the bottom surface of the plate-shaped side support, and the spines are vertically downward.
[0044] The mesh size of the net is not less than 30 meshes.
[0045] The mesh material can be common nylon, polyethylene (PE), natural mesh yarn, artificial fiber, and high-density specially designed carbon fiber with added nanotechnology, etc. The mesh size is not less than 30 meshes (sieve hole size ≤ 0.6mm).
[0046] The invention creates a barrier device designed in combination with the life history characteristics of crayfish to isolate the crayfish from returning to the pond, which is convenient for farmers to control the density of crayfish in the pond by timely raising and lowering the barrier net, so as to effectively carry out precise feeding and water quality control. With the help of this device, the growth and survival rate of river crabs in the early stage can be maintained without affecting the growth of crayfish, which is conducive to the mixed culture of shrimps and crabs.
Claims
1. A device for preventing shrimp from returning to a pond, comprising a breeding pond and an isolation net; a slope protection is provided between the pond stem and the bottom of the breeding pond, and is characterized in that An isolation net is installed around the bottom of the pool. The isolation net is installed vertically on the slope protection, and the bottom edge of the isolation net is 30cm to 40cm higher than the bottom of the pool. The height of the isolation net is not less than 50cm; The isolation net is divided into a plurality of units, each of which is adjacent to the other in sequence; any unit includes a net body and a support mechanism, and the net body is connected to the support mechanism in a liftable manner; The support mechanism includes two mutually parallel pillars, the bottoms of the two pillars are connected by a horizontal bar, and the two pillars have longitudinal slide grooves on the opposite sides; the two sides of the net body are slidably connected in the slide grooves; the bottom edge of the net body cooperates with the horizontal bar; The bottom end of the pillar is connected with a vertical downward ground nail, and the bottom end of the pillar is also connected with a downward oblique side support, and the angle between the side support and the pillar corresponds to the angle of the slope protection; the ground nail is inserted into the slope protection, and the side support is supported on the surface of the slope protection; The bottom edge of the horizontal bar is sharp and embedded in the slope protection.
2. The device for blocking postlarvae from returning to the pond according to claim 1, characterized in that The net body is wound on a reel, the top edge of the net body is connected to the reel, the bottom edge of the net body is connected to a horizontal pull rod, a hook is arranged in the middle of the pull rod, and a hook ring corresponding to the hook is arranged on the horizontal bar; the reel is installed on the top of a pair of pillars.
3. The blocking device for returning shrimp to the pond according to claim 1 is characterized in that The outer edge of the net body is connected with a rectangular frame, and the rectangular frame is slidably connected in the sliding grooves of a pair of pillars from top to bottom.
4. The blocking device for holding shrimps back to the pond according to claim 1, 2 or 3, characterized in that The side supports are strip-shaped, and the bottom surfaces of the strip-shaped side supports are connected with ground nails pointing vertically downwards.
5. The blocking device for holding shrimps back to the pond according to claim 1, 2 or 3, characterized in that The side support is plate-shaped, and a plurality of thorns are connected to the bottom surface of the plate-shaped side support, and the thorns are vertically downward.
6. The device for preventing postlarvae from returning to the pond according to claim 1, characterized in that The mesh size of the net is not less than 30 meshes.