Large-water-surface freshwater silver carp and bighead carp culture method

Abstract

The invention discloses a large-water-surface freshwater silver carp and bighead carp culture method. The method comprises the following steps: S1, selecting water surfaces of large reservoirs and lakes; s2, fries which are bred in the current year and have the weight of 0.15-0.25 kg are put in the last ten days of October to the middle ten days of December; wherein the ratio of silver carp to bighead carp is 7: 3-6: 4; s3, after the growth cycle of 1.5-4 years, the bighead carps and the silver carps grow into adult fishes, and the adult fishes are caught and sold on the market. The chub is mainly fed by phytoplankton, particularly preferentially diatom, green alga and the like, and is a typical filter feeding fish, so that the chub proportion is higher, and the purification effect of a packaged water body is improved; most reservoirs in Lianyungang areas belong to plain type reservoirs, and the silver carps in the plain type shallow water reservoirs grow well, so that the throwing proportion of the bighead carps and the silver carps is appropriate. The large-water-surface freshwater silver carps and bighead carps are cultured to realize water purification with the carps. Firstly, fish food is put into the outer side of the large-mesh blocking net; and the influence of the fishing action on the growth of small-sized fishes is avoided in quantity.

Description

Technical Field

[0001] The present invention relates to fish farming, and more specifically to a method for culturing silver carp and bighead carp in large freshwater bodies. Background Art

[0002] Large water bodies generally refer to inland natural and semi-natural large water bodies such as lakes and reservoirs. The large water body fishery in China has gone through four different development stages: natural fishing, a combination of fishing and proliferation, mainly aquaculture, and ecological fishery, which has made important contributions to meeting the supply of animal protein for the Chinese people at different social development stages. The main fish species released into large water bodies are filter-feeding and water-purifying fish, namely bighead carp and silver carp. The bighead carp, also known as the spotted silver carp, black silver carp, and big-headed silver carp; the silver carp, also known as the white silver carp; the bighead carp has comb-like gill rakers and can filter plankton with a diameter greater than 50 μm, while the white silver carp has sponge-like gill rakers and its feeding range is between 10 and 1000 μm; for the ecological aquaculture of silver carp and bighead carp in large water bodies, no bait or fertilizer is applied, and the purpose is to effectively utilize the productivity of natural waters to purify water quality. The fish mainly feed on plankton, humus, organic debris, and nutrients brought by floods, and the production cycle is generally 4 years. Zhang Shuxian mentioned in the paper "Summary of Key Technologies for Ecologically Healthy Aquaculture in Large Water Bodies" published in the 3rd issue of "Henan Fisheries" in 2023 that the feeding habits of bighead carp and silver carp overlap. Since the aquaculture benefit of bighead carp is relatively high, the general release ratio is bighead carp:silver carp = 85:15. According to years of practice, the bighead carp grows well in mountainous deep reservoirs, and the silver carp grows well in plain shallow reservoirs. The release ratio of bighead carp and silver carp can be appropriately adjusted according to the actual situation of the reservoir type... After being frightened, fish will have a stress response. Especially for silver carp and bighead carp, they will stop growing or grow slowly for a period of time. At the same time, to ensure that a certain scale of breeding population of the original aquatic natural population in large water bodies participates in breeding activities and to guarantee the replenishment and prosperity of the population, a practical fishing plan must be formulated and fishery fishing control must be implemented... The "drive, block, stab, and trap" combined fishing method is used for fishing... The "drive, block, stab, and trap" combined fishing method should be carried out from October of each year to May of the following year. During this period, the water temperature is low, the activities and growth of fish are slow, and the impact of fishing activities on fish growth is relatively small; the time for the fixed net automatic into-box fishing method is from mid-to-late May to October. During this period, the water temperature is high, the activity ability of fish is strong, and it is easy to form a yield. Since this fishing method allows fish to swim into the net box by themselves according to their activity habits, the fish are not frightened. It weakens the impact of fishing on fish growth by taking the period when the fish itself grows slowly (such as the "drive, block, stab, and trap" combined fishing method from October of each year to May of the following year). The fixed net automatic into-box fishing method requires fixed fishing gear and automation equipment, and it needs to be regularly maintained to ensure the normal operation of the equipment. Moreover, using different fishing methods at different times in this way requires different fishing tools, which is both troublesome and costly. Summary of the Invention

[0003] The object of the present invention is to overcome the defects existing in the prior art and provide a method for culturing silver carp and bighead carp in large bodies of fresh water. Since silver carp mainly feed on phytoplankton, especially prefer diatoms, green algae, etc., and are typical filter-feeding fish, the proportion of silver carp is higher, improving the purification effect of the packaged water body. And most of the reservoirs in Lianyungang area belong to plain-type reservoirs, and silver carp grow well in plain-type shallow reservoirs. Therefore, such a stocking ratio of bighead carp and silver carp is also relatively appropriate. By culturing silver carp and bighead carp in large bodies of fresh water, water purification is achieved with fish.

[0004] To achieve the above object, the technical solution of the present invention is to design a method for culturing silver carp and bighead carp in large bodies of fresh water, which consists of the following steps: S1: Select the water surfaces of large reservoirs and lakes; S2: Stock the fry with a weight of 0.15 - 0.25 kg bred in the current year from late October to mid-December; the ratio of silver carp to bighead carp is 7:3 - 6:4; S3: After a growth cycle of 1.5 - 4 years, the silver carp and bighead carp grow into adult fish, and the adult fish are caught and sold on the market. Since silver carp mainly feed on phytoplankton, especially prefer diatoms, green algae, etc., and are typical filter-feeding fish, the proportion of silver carp is higher, improving the purification effect of the packaged water body. And most of the reservoirs in Lianyungang area belong to plain-type reservoirs, and silver carp grow well in plain-type shallow reservoirs. Therefore, such a stocking ratio of bighead carp and silver carp is also relatively appropriate. By culturing silver carp and bighead carp in large bodies of fresh water, water purification is achieved with fish.

[0005] A further technical solution is that barrier nets with different mesh sizes are arranged at intervals in the large water surface to separate silver carp and bighead carp of large and small specifications; in the step S3, before fishing, fish food or bait is put far away from the barrier net, and immediately after putting, the adult fish are caught. By the way of putting fish food at the barrier net, especially outside the barrier net with a large mesh size, small-sized fish can be guided away before fishing, and then fishing is carried out in the water area inside the barrier net with a large mesh size, reducing the impact of fishing actions on the growth of small-sized fish.

[0006] Another technical solution is that barrier nets with different mesh sizes are arranged at intervals in the large water surface to separate silver carp and bighead carp of large and small specifications; in the step S3, when putting fish food near the barrier net before fishing, the fish food is given a certain initial velocity to make the fish food move away from the barrier net, and immediately after putting, the adult fish are caught. By the way of putting fish food at the barrier net, especially outside the barrier net with a large mesh size and making the fish food move away from the barrier net with a large mesh size, more small-sized fish can be better guided away before fishing, and then fishing is carried out in the water area inside the barrier net with a large mesh size, reducing the impact of fishing actions on the growth of small-sized fish.

[0007] A further technical solution is that the mesh size of the barrier net with a large mesh size is 3 - 5 cm; the mesh size of the barrier net with a small mesh size is 1 - 2 cm.

[0008] A further technical solution is to arrange two large-mesh barrier nets and two small-mesh barrier nets in the large water area to separate silver carp and bighead carp of large and small specifications. The two small-mesh barrier nets are arranged at the upstream and downstream of the large water area, and the two large-mesh barrier nets are arranged between the two small-mesh barrier nets.

[0009] A further technical solution is to set up a fish food feeding mechanism on the large water surface. The fish food feeding mechanism includes a floating body, a bottom plate fixedly connected to the floating body, a fish food hopper fixedly arranged on the bottom plate, a sealing cover arranged on the fish food hopper, a feeding pipe communicated with the lower part of the fish food hopper. A part of the feeding pipe is located below the water surface of the large water area and a part is located above the water surface of the large water area. A number of spaced branch pipes are integrally arranged on the part of the feeding pipe located below the water surface of the large water area. The branch pipes are arranged obliquely downward and the pipe orifices of the branch pipes are arranged away from the barrier net. A blower fixedly connected to the bottom plate is connected to the fish food hopper. A large part of the feeding pipe is located below the water surface of the large water area. The branch pipes are arranged obliquely downward and the pipe orifices of the branch pipes are arranged away from the barrier net, that is, the pipe orifices of the branch pipes face the water area in the middle of the barrier net. When feeding fish food, the fed fish food can be given a certain initial velocity and move away from the barrier net. After the blower is controlled to start, the blower can blow strong wind. Since the fish food hopper is provided with a sealing cover, the strong wind makes the fish food spray out from the pipe orifices of the branch pipes, so as to make the fish food have a certain initial velocity and move away from the barrier net when the fish food is put near the barrier net before fishing. In this way, when feeding fish food, it is no longer put on the water surface as in the prior art, but put in the depth direction of the water surface. On the one hand, it avoids the influence on the growth of fish caused by the crowding of all fish swimming to the water surface. On the other hand, it can also feed the fish food more evenly, and can "guide" the fish away from the barrier net in the depth direction, contributing to reducing the impact on the fish in the subsequent fishing operation.

[0010] Square cylinders covering four or nine or sixteen mesh openings are fixedly arranged on the outer side of the fishing net used in the fishing process. The size of the square cylinder matches the size of the several mesh openings it covers. There are several square cylinders and there is a spacing between adjacent square cylinders. The square cylinder is made of the same material as the fishing net. A connecting ring is arranged at the connection between the square cylinder and the fishing net. The upper half of the connecting ring is made of stretchable plastic, and the lower half of the connecting ring is made of nylon or other non-stretchable materials. A semi-square-ring-shaped floating body is fixedly covered at the lower end of the cylinder opening of the square cylinder far away from the fishing net. A fishnet with the same mesh number as the large-mesh barrier net is also provided on a large-mesh barrier net. One end of the fishnet is fixedly connected to the lower surface of the large-mesh barrier net. The length of the fishnet is the same as that of the large-mesh barrier net. After the fishnet is folded once, it is hung at the middle height of the large-mesh barrier net, and the free end of the fishnet is close to the bottom of the large water surface; Hooks for hanging the fishnet are provided on both large-mesh barrier nets; The fishing process is to appropriately lift the two large-mesh barrier nets by a certain distance and bring the bottoms of the two large-mesh barrier nets closer by a certain distance, then take the fishnet down from the hanging place and hang it on the opposite large-mesh barrier net. Then, make the large-mesh barrier net that was not originally hung with the fishnet but is subsequently hung with the fishnet slightly higher in height than the other large-mesh barrier net. Then, lift the two large-mesh barrier nets simultaneously and keep the rising speeds of the two large-mesh barrier nets the same to complete the fishing; A fish food feeding mechanism is arranged outside the large-mesh barrier net. The fish food feeding mechanism includes a feeding pipe fixedly connected to the net wire of the large-mesh barrier net. Feeding ports are arranged at intervals on the feeding pipe. A square cylinder is fixedly arranged outside the large-mesh barrier net. The square cylinder covers four or nine mesh openings and the middle of the square cylinder is located at the feeding port. The structure of the square cylinder is basically the same as that of the previous embodiment, but an airbag is also fixedly arranged on the upper half of the connecting ring of the square cylinder. The airbag is provided with openings, and the openings are communicated with the feeding pipe. A filter screen can also be arranged at the openings to prevent fish food from entering the airbag; The fish food feeding mechanism also includes a floating body, a bottom plate fixedly connected to the floating body, a fish food hopper fixedly arranged on the bottom plate, a sealing cover arranged on the fish food hopper, and a feeding pipe communicated with the lower part of the fish food hopper; A blower fixedly connected to the bottom plate is connected to the fish food hopper; The feeding pipe and the feeding pipe are connected through a sealing connector; (The size of the square cylinder matches the size of several covered mesh openings; Several square cylinders are provided and there is a spacing between adjacent square cylinders; The square cylinder is made of the same material as the fishnet; A connecting ring is provided at the connection between the square cylinder and the fishnet. The upper half of the connecting ring is made of stretchable plastic, and the lower half of the connecting ring is made of nylon or other non-stretchable materials; A semi-square-ring-shaped floating body is fixedly covered at the lower end of the barrel opening of the square cylinder away from the fishnet) The advantages and beneficial effects of the present invention are as follows: By putting fish food at the barrier net, especially outside the large-mesh barrier net, small-sized fish can be guided away before fishing, and then fishing can be carried out in the water area inside the large-mesh barrier net, reducing the impact of fishing operations on the growth of small-sized fish.

[0011] By putting fish food at the barrier net, especially outside the large-mesh barrier net and guiding the fish food away from the large-mesh barrier net, more small-sized fish can be better guided away before fishing, and then fishing can be carried out in the water area inside the large-mesh barrier net, reducing the impact of fishing operations on the growth of small-sized fish.

[0012] When feeding fish food, it is no longer placed on the water surface as in the prior art, but is placed in the depth direction of the water surface. On the one hand, it avoids the impact on the growth of fish caused by the crowding of all fish swimming to the water surface. On the other hand, it also distributes the fish food more evenly, and can "guide" the fish away from the net in the depth direction, contributing to reducing the impact on the fish during subsequent fishing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the layout of the net in a large water area in Embodiment 1 of a method for culturing freshwater silver carp and bighead carp in a large water area according to the present invention; Figure 2 is a schematic diagram of the working state when feeding fish food in a large water area in Embodiment 2 of the present invention; Figure 3 is Figure 2 a schematic diagram of the layout of the net in the middle; Figure 4 is Figure 2 a schematic diagram of the fish food feeding mechanism in the middle; Figure 5 is Figure 2 a schematic diagram of the deployment of the fishing net for fishing in the water area within two large-mesh nets in the middle; Figure 6 is Figure 5 a disassembled schematic diagram of; Figure 7 is Figure 5 a side view of; Figure 8 is Figure 7 an enlarged schematic diagram of the square tube in the middle; Figure 9 is Figure 8 a left view of; Figure 10 is Figure 4 a three-dimensional schematic diagram of; Figure 11 is a schematic diagram of Embodiment 3 of the present invention; Figure 12 is Figure 11 a schematic diagram of two large-mesh nets in the middle; Figure 13 is Figure 11 a partial enlarged schematic diagram of the fish food feeding mechanism and its nearby components in the middle; Figure 14 is Figure 12 another working state schematic diagram of; Figure 15 is Figure 13 a partial enlarged schematic diagram of the square tube and its nearby components in the middle; Figure 16 is Figure 15 a partial enlarged schematic diagram of.

[0014] In the figure: 1. Small mesh net; 2. Large mesh net; 3. Floating body; 4. Bottom plate; 5. Fish food hopper; 6. Sealing cover; 7. Feeding pipe; 8. Branch pipe; 9. Blower; 10. Fishing net; 11. Square tube; 12. Connecting ring; 13. Semi-square ring-shaped floating body; 14. Feeding pipe; 15. Discharge port; 16. Airbag; 17. Opening. Detailed implementation manners

[0015] The following combines the accompanying drawings and embodiments to further describe the detailed implementation manners of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0016] Embodiment 1: As Figure 1 shown, the present invention is a method for cultivating silver carp and bighead carp in large water surfaces, which consists of the following steps: S1: Select the water surfaces of large reservoirs and lakes; S2: Release fry with a weight of 0.15 - 0.25 kg bred in the current year from late October to mid-December; among them, the ratio of silver carp to bighead carp is 7:3 - 6:4; S3: After a growth cycle of 1.5 - 4 years, the bighead carp and silver carp grow into adult fish, and the adult fish are fished and put on the market.

[0017] In the large water surface, nets with different mesh sizes are arranged at intervals to separate silver carp and bighead carp of large and small specifications; in the step S3, before fishing, fish food or bait is put far away from the net; immediately after putting it in, the adult fish are fished; the adult fish are fished during the period from August of the current year when the growth cycle reaches to mid-April of the following year; the mesh size of the large mesh net is 3 - 5 cm; the mesh size of the small mesh net is 1 - 2 cm; two large mesh nets are arranged in the large water surface, and two small mesh nets are arranged to separate silver carp and bighead carp of large and small specifications; the two small mesh nets 1 are arranged at the upstream and downstream of the large water surface area, and the two large mesh nets 2 are arranged between the two small mesh nets.

[0018] First, put fish food outside the large mesh net, so that small-sized fish that are not originally within the two large mesh nets are far away from the large mesh net (while large-sized fish cannot pass through the mesh of the large mesh net), and the small-sized fish originally within the two large mesh nets leave the water area between the two large mesh nets due to the putting of fish food, so the number of small-sized fish within the large mesh net can be reduced; quantitatively avoid the impact of the fishing action on the growth of small-sized fish.

[0019] Although some bait is put in, it is only put in during fishing, so the amount is small and the impact on the water body is very small; although the fish are frightened during fishing (and being frightened will affect the growth of the fish), and the silver carp and bighead carp that meet the market specifications are fished, so there is also no problem of affecting the growth of the fish about to be put on the market; avoid frightening the small-sized silver carp and bighead carp within the large mesh net when the fishing net is retracted; Example 2: The difference from Example 1 is that, as Figures 2 to 10 shown (for the convenience of illustration, Figure 5 only one square cylinder is shown; Figure 10 the structure on the bottom plate is not shown), in the large water surface, fishing nets with different mesh sizes are arranged at intervals to separate silver carp and bighead carp of large and small specifications; in the step S3, when putting fish food near the fishing net before fishing, the fish food is given a certain initial velocity to make the fish food away from the fishing net, and then the adult fish are fished immediately after putting; Fishing nets with different mesh sizes are arranged at intervals to separate silver carp and bighead carp of large and small specifications; during fishing, "attracting": that is, by putting fish food or bait away from the fishing net with large mesh size (furthermore, when putting near the fishing net, the fish food is given an initial velocity with a certain direction to make the fish food away from the fishing net 2 with large mesh size), and then the silver carp and bighead carp of large specifications are fished in time to avoid affecting the growth of silver carp and bighead carp of small specifications (because if the silver carp and bighead carp of large specifications meet the market specifications, they must be fished in time, otherwise it will affect the growth of silver carp and bighead carp of small specifications); in this way, when the fishing net is retracted, there are almost no silver carp and bighead carp of small specifications near the fishing net 2 with large mesh size, maximizing the avoidance of the impact of fishing actions on the growth of small-sized fish, and avoiding the impact of fishing actions on the growth of small-sized fish from the regional scope.

[0020] A fish food feeding mechanism is arranged on the large water surface. The fish food feeding mechanism includes a floating body 3, a bottom plate 4 fixedly connected to the floating body 3, a fish food hopper 5 fixedly arranged on the bottom plate, a sealing cover 6 is arranged on the fish food hopper 5, a feeding pipe 7 is communicated under the fish food hopper, a part of the feeding pipe 7 is under the water surface of the large water surface and a part is above the water surface of the large water surface. A plurality of branch pipes 8 arranged at intervals are integrally arranged on the part of the feeding pipe located under the water surface of the large water surface. The branch pipes are arranged obliquely downward and the pipe orifices of the branch pipes are arranged away from the fishing net; a blower 9 fixedly connected to the bottom plate is connected to the fish food hopper.

[0021] A square cylinder 11 covering four or nine or sixteen mesh openings is fixedly arranged outside the fishing net 10 (i.e., the fishing net used during fishing). The size of the square cylinder 11 matches the size of the several mesh openings it covers; there are several square cylinders and there is a spacing between adjacent square cylinders; the square cylinder 11 is made of the same material as the fishing net; a connecting ring 12 is arranged at the connection between the square cylinder 11 and the fishing net. The upper half of the connecting ring is made of stretchable plastic, and the lower half of the connecting ring 12 is made of nylon or other non-stretchable materials; A semi-square ring-shaped floating body 13 is fixedly covered at the lower end of the cylinder opening of the square cylinder 11 away from the fishing net; The spacing between the square tubes is preferably the size of the covered net openings, which can avoid the problem that adjacent square tubes are prone to bumping when lifting the net; when lifting the net, since the square tubes are arranged on the outer side of the fishing net, there will be a process in which the square tubes gradually leave the water surface and gradually emerge from the water surface; after the net is laid, there is "stored" water in the square tubes due to the liquid flow (and since a semi-square ring-shaped floating body 13 is arranged at its lower end, after the net is laid, the square tube 11 is in a basically horizontal state or tends to be in a horizontal state due to the buoyancy of the floating body and the "similar hinge" setting at its near-fishing-net end), and when the square tube gradually emerges from the water surface, since the upper half of the connecting ring 12 is telescopic, the square tube is similar to being "hinged" on the fishing net wire, so the end of the square tube far from the fishing net tilts downward during the process of gradually emerging from the water surface, so that the water in the square tube tends to flow out more, creating a local downstream water flow environment for small-sized fish in the fishing net near the square tube; small-sized silver carp and bighead carp flow downstream and flow out of the fishing net; minimize the impact of the fishing action (that is, the impact on the growth of small-sized fish in the large-mesh retaining net when the fishing net is retracted) on the growth of small-sized fish; compared with the prior art of directly putting fish food in the fishing area (such as the water area within two large-mesh retaining nets in this embodiment) to attract fish to gather and then fishing, in this embodiment, fish food is first put outside the large-mesh retaining net (but close to the large-mesh retaining net), and small-sized silver carp and bighead carp near the large-mesh retaining net within the two large-mesh retaining nets are attracted and "guided" out of the two large-mesh retaining nets, and then fishing in the water area between the two large-mesh retaining nets can reduce the impact of the fishing operation on the growth of small-sized fish, while in the prior art, when directly fishing after putting fish food, there are quite a number of small-sized fish that experience the process of the fishing net being retracted (although they can pass through the mesh of the fishing net and leave the fishing net, they still experience the fishing process), so it will have an impact on the growth of small-sized silver carp and bighead carp.

[0022] Since the breeding periods of silver carp and bighead carp are usually from late April to July, choosing to avoid fishing during this period can, on the one hand, avoid affecting their reproduction. Additionally, since freshwater fish have the habit of swimming against the current during the breeding period and with the current usually at other times, a water flow is formed during fishing to let small-sized silver carp and bighead carp flow downstream and out of the fishing net (since the fishing net catches adult fish, the mesh size of the fishing net is relatively large, such as the same as that of the large-mesh retaining net, 3 - 5 cm), minimizing the impact of the fishing action (that is, the impact on the growth of small-sized fish in the large-mesh retaining net when the fishing net is retracted) on the growth of small-sized fish and avoiding the impact of the fishing action on the growth of small-sized fish to a certain extent.

[0023] This solution does not require automated equipment, the fishing method is simple, only appropriate technical improvements need to be made on the existing original fishing net, the fishing tools are single, and the cost is also low; and this method maximally avoids the impact of fishing on the growth of small-sized silver carp and bighead carp.

[0024] Embodiment Three: The difference from Embodiment Two is as Figures 11 to 16As shown (for the convenience of illustration, the feeding pipe and the material conveying pipe in the fish food feeding mechanism are separately arranged), a large-mesh barrier net 2 is also provided with a fish net 10 having the same mesh number as that of the large-mesh barrier net. One end of the fish net 10 is fixedly connected to the lower surface of the large-mesh barrier net 2. The length of the fish net is the same as that of the large-mesh barrier net. After the fish net 10 is folded once, it is hung at the middle height of the large-mesh barrier net 2. The free end of the fish net 10 is close to the bottom of the large water surface; Hooks for hanging the fish net are provided on both large-mesh barrier nets 2; The fishing process is to appropriately lift the two large-mesh barrier nets 2 by a certain distance and bring the bottoms of the two large-mesh barrier nets closer to each other by a certain distance, then take down the fish net 10 from the hanging position and hang it on the opposite large-mesh barrier net. Then, make the large-mesh barrier net 2 that was not originally hung with the fish net 10 but is to be hung with the fish net later slightly higher than the other large-mesh barrier net. Then, lift the two large-mesh barrier nets simultaneously and keep the rising speeds of the two large-mesh barrier nets the same to complete the fishing; A fish food feeding mechanism is arranged outside the large-mesh barrier net. The fish food feeding mechanism includes a material conveying pipe 14 fixedly connected to the net line of the large-mesh barrier net. The material conveying pipe is provided with discharge ports 15 at intervals. A square tube 11 is fixedly arranged outside the large-mesh barrier net. The square tube 11 covers four or nine mesh openings and the middle of the square tube 11 is located at the discharge port 15. The structure of the square tube is basically the same as that of the previous embodiment, but an air bag 16 is also fixedly provided on the upper half of the connecting ring 12 of the square tube. The air bag is provided with an opening 17, and the opening is communicated with the material conveying pipe 14. A filter screen can also be provided at the opening to prevent fish food from entering the air bag; The fish food feeding mechanism also includes a floating body 3, a bottom plate 4 fixedly connected to the floating body, a fish food hopper 5 fixedly arranged on the bottom plate, a sealing cover 6 is arranged on the fish food hopper, and a feeding pipe 7 is communicated under the fish food hopper; A blower 9 fixedly connected to the bottom plate is connected to the fish food hopper; The feeding pipe 7 and the material conveying pipe 14 are connected through a sealing connector; (The size of the square tube matches the size of several covered mesh openings; There are several square tubes and there is a spacing between adjacent square tubes; The square tube is made of the same material as the fish net; A connecting ring 12 is provided at the connection between the square tube and the fish net. The upper half of the connecting ring is made of stretchable plastic, and the lower half of the connecting ring is made of nylon or other non-stretchable materials; A semi-square-ring-shaped floating body 13 is fixedly covered at the lower end of the tube opening of the square tube far from the fish net) The net barrier is combined with the fishing net, integrating the two into one, and a fish food feeding mechanism is also provided on the net barrier; the fishing net, the net barrier and the fish food feeding mechanism are integrated into one, avoiding the method of technically modifying and installing the square tube on the fishing net in the previous embodiment. Since the fishing net needs to be retracted and deployed multiple times, if a square tube is installed on it, problems such as entanglement are likely to occur. Therefore, technical modification is carried out on the relatively "rigid" net barrier to avoid the problem of the fishing net wire being wound around the square tube when the net barrier is retracted; before fishing, put fish food into the fish food hopper, then close the sealing cover, and then start the blower. The fish food is conveyed from the feeding pipe to the conveying pipe, and at the same time, it quickly flows towards the discharge port due to the wind force. Since the airbag is connected to the conveying pipe, the airbag expands during this process, and the formed square tube is no longer in a horizontal state but becomes inclined downward. Therefore, the fish food ejected from the discharge port is guided by the square tube and sprays obliquely downward and away, playing a role in "guiding" the flow of fish. After the fish food is put in, turn off the blower, and the airbag contracts due to elasticity and resets. The square tube also returns to nearly horizontal because the airbag no longer expands. In this way, finally, a local downstream water flow environment is still created during fishing; To better implement this embodiment, the technical solution in the patent with the application number 202410508614.4 previously applied by the applicant can be adopted. The fishing net also adopts a method of adjustable net mouth size (similar to the method of the net barrier with adjustable net mouth size in the aforementioned application number) to ensure that small fish are not harmed when passing through multiple layers of fishing nets and one layer of net barrier, and it is more convenient to pass through the large-mesh net barrier (including the large-mesh fishing net hung on the large-mesh net barrier). Additionally, a more preferable solution for the height of the fishing net is that after folding, it can avoid the free end of the fishing net directly contacting the bottom of the water and being easily worn and damaged.

[0025] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for breeding freshwater silver carp and bighead carp in large water surface, characterized in that: It consists of the following steps: S1: Select the water surface of large reservoirs and lakes; S2: From late October to mid-December, stock the fry weighing 0.15-0.25 kg that were bred that year; the ratio of silver carp to bighead carp is 7:3-6:4; S3: After a growth cycle of 1.5 to 4 years, bighead carp and silver carp grow into adult fish, which are then caught and marketed.

2. A large-surface freshwater silver carp and bighead carp breeding method according to claim 1, characterized in that: The large water surface is provided with nets of different mesh sizes to separate large and small silver carp and bighead carp; in the step S3, fish food or bait is thrown away from the nets before fishing, and the adult fish are caught immediately after the throwing.

3. A large-surface freshwater silver carp and bighead carp breeding method according to claim 1, characterized in that: The large water surface is provided with nets of different mesh sizes to separate large and small silver carp and bighead carp; in the step S3, before fishing, when fish food is thrown near the nets, the fish food has a certain initial velocity so that the fish food is away from the nets, and the adult fish are caught immediately after being thrown.

4. A large-surface freshwater silver carp and bighead carp breeding method according to claim 2 or 3, characterized in that: The mesh size of the large mesh blocking net is 3-5 cm; the mesh size of the small mesh blocking net is 1-2 cm.

5. A large-surface freshwater silver carp and bighead carp breeding method according to claim 4, characterized in that: Two large-mesh nets and two small-mesh nets are arranged in the large water surface to separate large-sized and small-sized silver carp and bighead carp; two small-mesh nets are set at the upstream and downstream of the large water surface, and the two large-mesh nets are set between the two small-mesh nets.

6. A large-surface freshwater silver carp and bighead carp breeding method according to claim 5, characterized in that: A fish food delivery mechanism is arranged on a large water surface, the fish food delivery mechanism comprises a float, a bottom plate fixedly connected to the float, a fish food hopper fixedly arranged on the bottom plate, a sealing cover arranged on the fish food hopper, a feeding pipe connected under the fish food hopper, a part of the feeding pipe is located under the water surface of the large water surface, and a part of the feeding pipe is located on the water surface of the large water surface, a plurality of branch pipes arranged at intervals are integrally arranged on the part of the feeding pipe located under the water surface of the large water surface, the branch pipes are arranged obliquely downward and the pipe openings of the branch pipes are arranged away from the intercepting net; the fish food hopper is connected to a blower fixedly connected to the bottom plate.

Images