Device and method for catching freshwater snails

Abstract

The invention relates to a device and method for catching freshwater snails, the device comprises a snail adsorption rod and a snail catching net, a hole is formed in the center of the snail catching net, the snail adsorption rod is inserted in the middle of the snail catching net, and a gap exists between the snail adsorption rod and the snail catching net; the snail adsorption rods are uniformly fixed and distributed at the bottom of a pond or a lake reservoir; the snail catching net penetrates through the snail adsorption rod and is arranged at the bottom of the pond or the lake reservoir; and the snail fishing net is connected with a lifting or inflating floating device. The snail adsorption rod and the snail fishing net are used in cooperation, collection of a large batch of living snails is completed, snails dead of diseases and young snails are rapidly removed without toxic and side residues, manpower is saved, and meanwhile the purpose that automatic harvesting can be completed by automatically inflating the floating air bag at regular time and using the floating air bag as an intelligent fishery component is achieved.

Description

Technical Field

[0001] The invention belongs to the field of aquaculture, and in particular relates to a device and a method for catching freshwater snails. Background Art

[0002] Common economic species of freshwater snails include species of the genus Anilophora (square-shaped Anilophora, pear-shaped Anilophora, copper-rusted Anilophora, painted Anilophora, etc.) and species of the genus Ophiopoda (northeastern field snail, Chinese round field snail, spherical round field snail, etc.), which are often collectively referred to as snails, snails, stone snails, etc. Anilophora and Ophiopoda species are widely distributed throughout the country, with large production and many uses. They are one of the important baits for aquatic economic animals such as black carp, broad-bodied golden leech, Chinese mitten crab and soft-shelled turtle, as well as some waterfowl. They are also one of the aquatic products that the majority of residents love very much, so they are increasingly receiving widespread attention. As an important part of the freshwater ecosystem, freshwater snails are both consumers and decomposers, feeding on plankton in the water body and licking organic debris in the environment. They play an important role in controlling the deposition of organic matter in the aquatic environment and maintaining wetland functions.

[0003] Since the life span of snails is 2 to 3 years, large individuals close to the life limit will compete with other individuals for water and food, and their death and decay will affect the water quality. Timely capture of large ones and leaving small ones will help reduce the impact of water pollution and promote the vitality and productivity of the population. In the breeding process, freshwater snails are small and numerous, which makes them difficult to salvage. At present, the most commonly used methods of snail fishing are dry pond fishing and trawling. Dry pond fishing is complicated, labor-intensive and costly; trawl nets are easy to miss snails in the mud, so the capture rate is low, resulting in more older and larger individuals remaining in the waters. If you rely solely on manual salvage, it will take a lot of manpower and energy, greatly increase the cost of snail breeding, and it may even be impossible to salvage hundreds or thousands of tons of freshwater snails. Summary of the invention

[0004] To solve the above problems, the present invention provides a device and method for catching freshwater snails, which utilizes the coordinated use of snail adsorption rods and snail catching nets to complete the collection of large quantities of live snails, and achieve rapid, non-toxic and labor-saving removal of dead and young snails.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A device for catching freshwater snails comprises a snail suction rod 1 and a snail catching net 2. A hole 6 is arranged at the center of the snail catching net 2. The snail suction rod 1 is inserted in the middle of the snail catching net 2. There is a gap between the snail suction rod 1 and the snail catching net 2. The snail suction rod 1 is evenly fixed and distributed in a pond or a lake reservoir. The snail catching net 2 passes through the snail suction rod 1 and is placed at the bottom of the pond or a lake reservoir. The snail catching net 2 is connected to a lifting device.

[0007] In the present technical solution, further, the overall shape of the snail catching net 2 is bowl-shaped, pyramid-shaped or cone-shaped.

[0008] Furthermore, the lifting device is a draw rope 3, and the upper edge of the snail catching net 2 is connected with the draw rope 3, and the draw rope 3 is symmetrically arranged.

[0009] Furthermore, the lifting device is a floating air bag 4, and the upper edge of the snail fishing net 2 is connected with the floating air bag 4, and the floating air bag 4 is symmetrically arranged.

[0010] Furthermore, the lifting device is a hollow air bag 5 , and the bottom of the snail fishing net 2 is provided with a hollow air bag 5 , and the hollow air bag 5 surrounds the snail adsorption rod 1 .

[0011] Furthermore, a gap of 8mm-10mm is provided between the snail adsorption rod 1 and the snail catching net 2.

[0012] Furthermore, the snail catching net 2 is made of stainless steel, and the mesh diameter is 250mm-300mm.

[0013] Furthermore, the snail adsorption rod 1 is made of one or more of polyethylene plastic, polypropylene plastic, polyvinyl chloride plastic, and bamboo pole, and the adsorption rod is a solid or hollow structure.

[0014] Furthermore, the snail adsorption rod 1 is a round or elliptical column with a diameter of 90mm-200mm and a length 15cm higher than the water surface of the pond or lake reservoir.

[0015] Furthermore, freshwater snails include the ring-shaped snail and the round pond snail.

[0016] Furthermore, the freshwater snails are one or more of the square-ringed snail, pear-shaped ring-ridged snail, copper-rusted ring-ridged snail, painted ring-ridged snail, Northeastern field snail, Chinese round field snail, and spherical field snail.

[0017] Furthermore, the method for catching freshwater snails using the above device comprises the following steps:

[0018] A. A plurality of snail adsorption rods 1 are evenly fixed on the bottom of a pond or a lake reservoir, and a snail catching net 2 passes through the snail adsorption rods 1 and is placed on the bottom of the pond or a lake reservoir;

[0019] B. Snails are adsorbed on the snail adsorption rod 1 and the snail catching net 2 during their growth;

[0020] C. After a period of time, the snail fishing net 2 is lifted upward or automatically floats by pulling up the drawstring 3 or inflating the upward floating airbag 4 or the hollow airbag 5;

[0021] D. When the snail fishing net 2 is moving upward, the snails adsorbed on the snail adsorption rod 1 are scraped off and fall into the snail fishing net 2;

[0022] E. The snail fishing net 2 shakes when it moves upward, and the small snails are screened out by the mesh of the snail fishing net 2, and successfully return to the pond or lake reservoir to continue growing;

[0023] F, the snail fishing net 2 is taken back to complete the fishing of snails.

[0024] In the technical scheme, the snail adsorption rod and the snail fishing net are used in combination, and the snail fishing net is lifted upward or automatically floated by pulling up the drawstring or inflating the upward floating airbag or hollow airbag, and the live freshwater snails of suitable size on the snail adsorption rod are scraped off and fall into the snail fishing net, thereby completing the collection of a large number of live snails. There is a gap between the snail adsorption rod and the snail fishing net, so that the young snails that are too small will not be collected, and the sick and dead snails that cannot be adsorbed on the snail adsorption rod will also not be collected. At the same time, during the upward lifting or floating process of the snail fishing net, the snail fishing net shakes, and the small snails or sick and dead snails are screened again by using the mesh of the snail fishing net, and the young snails successfully return to the pond or lake reservoir to continue to grow, thereby achieving the purpose of quickly, non-toxic and non-residual, and labor-saving removal of sick and dead snails and young snails.

[0025] In the technical scheme, the method of catching freshwater snails, compared with the traditional dry pond fishing and trawling methods, greatly reduces the difficulty of manual operation, saves processing costs, and greatly reduces the intensity of manual labor.

[0026] In the present technical scheme, the snail catching net is a stainless steel net with a mesh diameter of 250mm-300mm, the snail suction rod is a plastic rod or bamboo rod with a diameter of 90mm-200mm, and there is a gap of 8mm-10mm between the snail catching net and the snail suction rod. The shell height of newborn snails is about 7mm, and the shell height of medium-sized individuals is about 44.4mm and the width is about 27.5mm. Therefore, the design of the above dimensions can catch most freshwater snails, which not only realizes the collection and capture of a large number of snails, but also achieves the purpose of separating diseased and dead snails and screening out young snails. It has extremely strong application value in the process of snail breeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 This is a three-dimensional structural diagram of the freshwater snail catching device of Example 1;

[0029] Figure 2 This is a top view of the structure of the freshwater snail catching device of Example 1;

[0030] Figure 3 This is a three-dimensional structural diagram of the freshwater snail catching device of Example 2;

[0031] Figure 4 This is a three-dimensional structural diagram of the freshwater snail catching device of Example 3;

[0032] Figure 5 This is a three-dimensional structural diagram of the freshwater snail catching device of Example 4;

[0033] Figure 6 This is a three-dimensional structural diagram of the freshwater snail catching device of Example 5;

[0034] Figure 7 This is the overall distribution diagram of the freshwater snail catching device in Example 6.

[0035] Reference numerals:

[0036] 1. Snail suction rod 2. Snail fishing net 3. Drawstring 4. Floating air bag

[0037] 5. Hollow airbags 6. Holes 7. Fishing boats DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] Embodiment 1:

[0040] like Figure 1 and Figure 2 As shown, a device for catching freshwater snails includes a snail suction rod 1 and a snail catching net 2. A hole 6 is provided in the center of the snail catching net 2. The snail suction rod 1 is inserted in the middle of the snail catching net 2. There is a gap between the snail suction rod 1 and the snail catching net 2. The snail suction rod 1 is evenly fixed and distributed in the pond or lake reservoir. The snail catching net 2 passes through the snail suction rod 1 and is placed at the bottom of the pond or lake reservoir. The snail catching net 2 is connected to a lifting device.

[0041] The overall shape of the snail fishing net 2 is a bowl, a pyramid or a cone. In this embodiment, the shape of the snail fishing net 2 is an inverted quadrangular pyramid.

[0042] The lifting device is a draw rope 3, and the upper edge of the snail fishing net 2 is connected with the draw rope 3, and the draw rope 3 is symmetrically arranged. In this embodiment, the lifting device is 4 draw ropes 3, which are respectively connected to the four corners of the snail fishing net 2.

[0043] A gap of 8 mm to 10 mm is provided between the snail adsorption rod 1 and the snail catching net 2. In this embodiment, a gap of 8 mm is provided between the snail adsorption rod 1 and the snail catching net 2.

[0044] The material of the snail fishing net 2 is stainless steel, and the mesh diameter is 250mm-300mm. In this embodiment, the mesh diameter of the snail fishing net 2 is 250mm.

[0045] The material of the snail adsorption rod 1 is one or more of polyethylene plastic, polypropylene plastic, polyvinyl chloride plastic, and bamboo pole; in this embodiment, the material of the snail adsorption rod 1 is polyethylene plastic.

[0046] The snail adsorption rod 1 is a circular or elliptical columnar body with a diameter of 90mm-200mm and a length 15cm above the water surface of the pond or lake reservoir. In this embodiment, the snail adsorption rod 1 is a circular columnar body with a diameter of 200mm.

[0047] The method for catching freshwater snails using the above device comprises the following steps:

[0048] A. The snail adsorption rod 1 is fixed to the bottom of a pond or a lake reservoir, and the snail fishing net 2 passes through the snail adsorption rod 1 and is placed at the bottom of the pond or a lake reservoir;

[0049] B. Snails are adsorbed on the snail adsorption rod 1 and the snail catching net 2 during their growth;

[0050] C. After a period of time, the draw rope 3 is pulled up to lift the snail fishing net 2 upward;

[0051] D. When the snail fishing net 2 is moving upward, the snails adsorbed on the snail adsorption rod 1 are scraped off and fall into the snail fishing net 2;

[0052] E. The snail fishing net 2 shakes when it moves upward, and the small snails are screened out by the mesh of the snail fishing net 2, and successfully return to the pond or lake reservoir to continue growing;

[0053] F, the snail fishing net 2 is taken back to complete the fishing of snails.

[0054] Embodiment 2:

[0055] like Figure 3 As shown, a device for catching freshwater snails includes a snail suction rod 1 and a snail catching net 2. A hole 6 is provided in the center of the snail catching net 2. The snail suction rod 1 is inserted in the middle of the snail catching net 2. There is a gap between the snail suction rod 1 and the snail catching net 2. The snail suction rod 1 is evenly fixed and distributed in the pond or lake reservoir. The snail catching net 2 passes through the snail suction rod 1 and is placed at the bottom of the pond or lake reservoir. The snail catching net 2 is connected to a lifting device.

[0056] The overall shape of the snail fishing net 2 is a bowl, a pyramid or a cone. In this embodiment, the shape of the snail fishing net 2 is an inverted quadrangular pyramid.

[0057] The lifting device is a floating air bag 4, and the upper edge of the snail fishing net 2 is connected with the floating air bag 4, and the floating air bag 4 is symmetrically arranged. In this embodiment, the floating air bag 4 surrounds the upper edge of the snail fishing net 2.

[0058] A gap of 8 mm to 10 mm is provided between the snail adsorption rod 1 and the snail catching net 2. In this embodiment, a gap of 9 mm is provided between the snail adsorption rod 1 and the snail catching net 2.

[0059] The material of the snail fishing net 2 is stainless steel, and the mesh diameter is 250mm-300mm. In this embodiment, the mesh diameter of the snail fishing net 2 is 270mm.

[0060] The material of the snail adsorption rod 1 is one or more of polyethylene plastic, polypropylene plastic, polyvinyl chloride plastic, and bamboo pole; in this embodiment, the material of the snail adsorption rod 1 is polyvinyl chloride plastic.

[0061] The snail adsorption rod 1 is a circular or elliptical columnar body with a diameter of 90 mm to 200 mm and a length 15 cm higher than the water surface of the pond or lake reservoir. In this embodiment, the snail adsorption rod 1 is a circular columnar body with a diameter of 90 mm.

[0062] The method for catching freshwater snails using the above device comprises the following steps:

[0063] A. The snail adsorption rod 1 is fixed to the bottom of a pond or a lake reservoir, and the snail fishing net 2 passes through the snail adsorption rod 1 and is placed at the bottom of the pond or a lake reservoir;

[0064] B. Snails are adsorbed on the snail adsorption rod 1 and the snail catching net 2 during their growth;

[0065] C. After a period of time, the upward floating air bag 4 is inflated by using a movable and portable high-pressure container filled with liquid nitrogen or liquid carbon dioxide, so that the snail fishing net 2 automatically floats;

[0066] D. When the snail fishing net 2 is moving upward, the snails adsorbed on the snail adsorption rod 1 are scraped off and fall into the snail fishing net 2;

[0067] E. The snail fishing net 2 shakes when it moves upward, and the small snails are screened out by the mesh of the snail fishing net 2, and successfully return to the pond or lake reservoir to continue growing;

[0068] F, the snail fishing net 2 is taken back to complete the fishing of snails.

[0069] Embodiment 3:

[0070] like Figure 4 As shown, a device for catching freshwater snails includes a snail suction rod 1 and a snail catching net 2. A hole 6 is provided in the center of the snail catching net 2. The snail suction rod 1 is inserted in the middle of the snail catching net 2. There is a gap between the snail suction rod 1 and the snail catching net 2. The snail suction rod 1 is evenly fixed and distributed in the pond or lake reservoir. The snail catching net 2 passes through the snail suction rod 1 and is placed at the bottom of the pond or lake reservoir. The snail catching net 2 is connected to a lifting device.

[0071] The overall shape of the snail fishing net 2 is a bowl, a pyramid or a cone. In this embodiment, the shape of the snail fishing net 2 is an inverted quadrangular pyramid.

[0072] The lifting device is a hollow air bag 5, and the bottom of the snail fishing net 2 is provided with a hollow air bag 5, and the hollow air bag 5 surrounds the snail adsorption rod 1. In this embodiment, the floating air bag 4 is annular and surrounds the snail adsorption rod 1.

[0073] A gap of 8 mm to 10 mm is provided between the snail adsorption rod 1 and the snail catching net 2. In this embodiment, a gap of 10 mm is provided between the snail adsorption rod 1 and the snail catching net 2.

[0074] The material of the snail fishing net 2 is stainless steel, and the mesh diameter is 250mm-300mm. In this embodiment, the mesh diameter of the snail fishing net 2 is 300mm.

[0075] The material of the snail adsorption rod 1 is one or more of polyethylene plastic, polypropylene plastic, polyvinyl chloride plastic, and bamboo pole; in this embodiment, the material of the snail adsorption rod 1 is bamboo pole.

[0076] The snail adsorption rod 1 is a circular or elliptical columnar body with a diameter of 90mm-200mm and a length 15cm higher than the water surface of the pond or lake reservoir. In this embodiment, the snail adsorption rod 1 is a circular columnar body with a diameter of 100mm.

[0077] The method for catching freshwater snails using the above device comprises the following steps:

[0078] A. The snail adsorption rod 1 is fixed to the bottom of a pond or a lake reservoir, and the snail fishing net 2 passes through the snail adsorption rod 1 and is placed at the bottom of the pond or a lake reservoir;

[0079] B. Snails are adsorbed on the snail adsorption rod 1 and the snail catching net 2 during their growth;

[0080] C. After a period of time, the hollow air bag 5 is inflated by using a portable high-pressure container filled with compressed air or liquid carbon dioxide, so that the snail fishing net 2 automatically floats up;

[0081] D. When the snail fishing net 2 is moving upward, the snails adsorbed on the snail adsorption rod 1 are scraped off and fall into the snail fishing net 2;

[0082] E. The snail fishing net 2 shakes when it moves upward, and the small snails are screened out by the mesh of the snail fishing net 2, and successfully return to the pond or lake reservoir to continue growing;

[0083] F, the snail fishing net 2 is taken back to complete the fishing of snails.

[0084] Embodiment 4:

[0085] like Figure 5 As shown, a device for catching freshwater snails includes a snail suction rod 1 and a snail catching net 2. A hole 6 is provided in the center of the snail catching net 2. The snail suction rod 1 is inserted in the middle of the snail catching net 2. There is a gap between the snail suction rod 1 and the snail catching net 2. The snail suction rod 1 is evenly fixed and distributed in the pond or lake reservoir. The snail catching net 2 passes through the snail suction rod 1 and is placed at the bottom of the pond or lake reservoir. The snail catching net 2 is connected to a lifting device.

[0086] The overall shape of the snail fishing net 2 is a bowl, a pyramid or a cone. In this embodiment, the shape of the snail fishing net 2 is an inverted cone.

[0087] The lifting device is a floating air bag 4, and the upper edge of the snail fishing net 2 is connected with the floating air bag 4, and the floating air bag 4 is symmetrically arranged. In this embodiment, the floating air bag 4 surrounds the upper edge of the snail fishing net 2.

[0088] A gap of 8 mm to 10 mm is provided between the snail adsorption rod 1 and the snail catching net 2. In this embodiment, a gap of 9 mm is provided between the snail adsorption rod 1 and the snail catching net 2.

[0089] The material of the snail fishing net 2 is stainless steel, and the mesh diameter is 250mm-300mm. In this embodiment, the mesh diameter of the snail fishing net 2 is 280mm.

[0090] The material of the snail adsorption rod 1 is one or more of polyethylene plastic, polypropylene plastic, polyvinyl chloride plastic, and bamboo pole; in this embodiment, the material of the snail adsorption rod 1 is polyvinyl chloride plastic.

[0091] The snail adsorption rod 1 is a circular or elliptical columnar body with a diameter of 90mm-200mm and a length 15cm higher than the water surface of the pond or lake reservoir. In this embodiment, the snail adsorption rod 1 is a circular columnar body with a diameter of 150mm.

[0092] The method for catching freshwater snails using the above device comprises the following steps:

[0093] A. The snail adsorption rod 1 is fixed to the bottom of a pond or a lake reservoir, and the snail fishing net 2 passes through the snail adsorption rod 1 and is placed at the bottom of the pond or a lake reservoir;

[0094] B. Snails are adsorbed on the snail adsorption rod 1 and the snail catching net 2 during their growth;

[0095] C. After a period of time, the upward floating air bag 4 is inflated by using a movable and portable high-pressure container filled with liquid nitrogen or liquid carbon dioxide, so that the snail fishing net 2 automatically floats;

[0096] D. When the snail fishing net 2 is moving upward, the snails adsorbed on the snail adsorption rod 1 are scraped off and fall into the snail fishing net 2;

[0097] E. The snail fishing net 2 shakes when it moves upward, and the small snails are screened out by the mesh of the snail fishing net 2, and successfully return to the pond or lake reservoir to continue growing;

[0098] F, the snail fishing net 2 is taken back to complete the fishing of snails.

[0099] Embodiment 5:

[0100] like Figure 6 As shown, a device for catching freshwater snails includes a snail suction rod 1 and a snail catching net 2. A hole 6 is provided in the center of the snail catching net 2. The snail suction rod 1 is inserted in the middle of the snail catching net 2. There is a gap between the snail suction rod 1 and the snail catching net 2. The snail suction rod 1 is evenly fixed and distributed in the pond or lake reservoir. The snail catching net 2 passes through the snail suction rod 1 and is placed at the bottom of the pond or lake reservoir. The snail catching net 2 is connected to a lifting device.

[0101] The overall shape of the snail fishing net 2 is bowl-shaped, pyramid-shaped or cone-shaped. In this embodiment, the shape of the snail fishing net 2 is cone-shaped.

[0102] The lifting device is a hollow air bag 5, and the bottom of the snail fishing net 2 is provided with a hollow air bag 5, and the hollow air bag 5 surrounds the snail adsorption rod 1. In this embodiment, the floating air bag 4 is annular and surrounds the snail adsorption rod 1.

[0103] A gap of 8 mm to 10 mm is provided between the snail adsorption rod 1 and the snail catching net 2. In this embodiment, a gap of 9 mm is provided between the snail adsorption rod 1 and the snail catching net 2.

[0104] The material of the snail fishing net 2 is stainless steel, and the mesh diameter is 250mm-300mm. In this embodiment, the mesh diameter of the snail fishing net 2 is 260mm.

[0105] The material of the snail adsorption rod 1 is one or more of polyethylene plastic, polypropylene plastic, polyvinyl chloride plastic, and bamboo pole; in this embodiment, the material of the snail adsorption rod 1 is bamboo pole.

[0106] The snail adsorption rod 1 is a circular or elliptical columnar body with a diameter of 90mm-200mm and a length 15cm higher than the water surface of the pond or lake reservoir. In this embodiment, the snail adsorption rod 1 is a circular columnar body with a diameter of 180mm.

[0107] The method for catching freshwater snails using the above device comprises the following steps:

[0108] A. The snail adsorption rod 1 is fixed to the bottom of a pond or a lake reservoir, and the snail fishing net 2 passes through the snail adsorption rod 1 and is placed at the bottom of the pond or a lake reservoir;

[0109] B. Snails are adsorbed on the snail adsorption rod 1 and the snail catching net 2 during their growth;

[0110] C. After a period of time, the hollow air bag 5 is inflated by using a portable high-pressure container filled with compressed air or liquid carbon dioxide, so that the snail fishing net 2 automatically floats up;

[0111] D. When the snail fishing net 2 is moving upward, the snails adsorbed on the snail adsorption rod 1 are scraped off and fall into the snail fishing net 2;

[0112] E. The snail fishing net 2 shakes when it moves upward, and the small snails are screened out by the mesh of the snail fishing net 2, and successfully return to the pond or lake reservoir to continue growing;

[0113] F, the snail fishing net 2 is taken back to complete the fishing of snails.

[0114] Embodiment 6:

[0115] like Figure 7 As shown, a device for catching freshwater snails includes a snail adsorption rod 1 and a snail catching net 2. The snail catching net 2 passes through the snail adsorption rod 1 and is placed at the bottom of a pond or lake reservoir; the snail catching net 2 is connected to a lifting device. Multiple snail adsorption rods 1 are evenly fixed at the bottom of a pond or lake reservoir, and the arrangement density in the water body is 1 per square meter. The snail catching net 2 passes through the snail adsorption rod 1 and is placed at the bottom of a pond or lake reservoir. The boat passage area is placed between multiple freshwater snail catching devices, and the fishing boat 7 travels around the snail adsorption rod 1 to facilitate the farmers to collect the net.

Claims

1. A device for catching freshwater snails, characterized in that: The invention comprises a snail adsorption rod (1) and a snail catching net (2); a hole is arranged at the center of the snail catching net (2); the snail adsorption rod (1) is inserted in the middle of the snail catching net (2); a gap exists between the snail adsorption rod (1) and the snail catching net (2); the snail adsorption rod (1) is evenly fixed and distributed in a pond or a lake reservoir; the snail catching net (2) passes through the snail adsorption rod (1) and is placed at the bottom of the pond or a lake reservoir; the snail catching net (2) is provided with a lifting device.

2. The device according to claim 1, characterized in that: The overall shape of the snail catching net (2) is bowl-shaped, pyramid-shaped or cone-shaped.

3. The device according to claim 1, characterized in that: The lifting device is a draw rope (3), the upper edge of the snail catching net (2) is connected with the draw rope (3), and the draw rope (3) is symmetrically arranged.

4. The device according to claim 1, characterized in that: The lifting device is a floating air bag (4), the upper edge of the snail fishing net (2) is connected to the floating air bag (4), and the floating air bag (4) is symmetrically arranged.

5. The device according to claim 1, characterized in that: The lifting device is a hollow air bag (5), and the bottom of the snail fishing net (2) is provided with a hollow air bag (5), and the hollow air bag (5) surrounds the snail adsorption rod (1).

6. The device according to claim 1, characterized in that: A gap of 8 mm to 10 mm is provided between the snail adsorption rod (1) and the snail catching net (2).

7. The device according to claim 1, characterized in that: The snail catching net (2) is made of stainless steel, and has a diameter of 250 mm to 300 mm.

8. The device according to claim 1, characterized in that: The material of the snail adsorption rod (1) is one or more of polyethylene plastic, polypropylene plastic, polyvinyl chloride plastic, and bamboo pole, and the adsorption rod is a solid or hollow structure.

9. The device according to claim 1, characterized in that: The snail adsorption rod (1) is a round or elliptical columnar body with a diameter of 90 mm to 200 mm and a length 15 cm higher than the water surface of the pond or lake reservoir.

10. A method for catching freshwater snails using a device according to any one of claims 3, 4 and 5, characterized in that: The following steps are involved: A. A snail suction rod (1) is fixed to the bottom of a pond or a lake or a reservoir, and a snail catching net (2) passes through the snail suction rod (1) and stands upright on the bottom of the pond or a lake or a reservoir; B. Snails with strong vitality and physique are attached to the snail attachment rod (1) and the snail fishing net (2); C. regularly pulling up the drawstring (3) or inflating the upward floating airbag (4) or the hollow airbag (5) so that the snail fishing net (2) is slowly lifted upward or automatically floats up; D. When the snail catching net (2) moves upward, the snails adsorbed on the snail adsorption rod (1) are scraped off, and the snails fall into the catching net (2) due to the stimulation; E. The snail fishing net (2) is slightly shaken during the upward movement, and the small snails are screened out by using the mesh of the snail fishing net (2), and the snails are successfully returned to the pond or lake reservoir to continue growing; F. Retract the snail fishing net (2) to complete the snail fishing.

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