A device for breeding eels in a rice field

Abstract

The application discloses a device for breeding eels in rice fields, which comprises a ring-shaped ditch, a plurality of eel nests and a multifunctional box. The ring-shaped ditch is arranged between a ridge and a small ridge around the rice field. The plurality of eel nests are arranged in the ring-shaped ditch. The multifunctional box is arranged on the ridge around the rice field. The multifunctional box supplies the plurality of eel nests with required bait, water and air through a main pipeline. The eel nest comprises a nest body, two S-shaped outlet structures and a nest pipeline. The nest body is a flat tubular structure. The eel can freely turn around in the nest body. The two S-shaped outlet structures are respectively connected to two ends of the nest body. The nest pipeline is arranged perpendicularly to the nest body. One end of the nest pipeline is communicated with the nest body. The other end of the nest pipeline is connected to the main pipeline. The device provides artificial nests for eels in modern planting rice fields. The eel breeding, feeding and management are convenient. The eel breeding is not affected by chemical fertilizers and pesticides. The eel breeding does not affect the mechanized harvesting of rice. The eel breeding promotes the growth of eels and the yield increase of rice fields.

Description

Technical Field

[0001] This invention belongs to the field of eel farming technology, and specifically relates to a device for eel farming in rice paddies. Background Technology

[0002] The swamp eel is widely distributed in my country and exhibits a spring-emergence, hibernation habit. When the water temperature in its habitat drops below 10°C, swamp eels will retreat into burrows to spend the winter. They will only emerge from their burrows to forage when the water temperature rises above 13°C in spring and summer. Swamp eels are carnivorous, feeding on insects and their larvae, small fish and fish eggs, crustaceans such as shrimp, cladocerans, and copepods, as well as tadpoles and young frogs. They may even consume some organic detritus and phytoplankton. Swamp eels primarily rely on their well-developed sense of smell and touch to hunt. They are quite aggressive and fierce when hunting, capable of opening their mouths wide enough to swallow large prey. Swamp eels are nocturnal. During the day, they typically remain in burrows, only exposing their heads or snouts at the entrance, waiting for opportunities to hunt. At night, they actively emerge from their burrows to forage. Eels can breathe air directly using the epidermis of their mouth and throat lining as "auxiliary respiratory organs," and can also survive in mud or moist soil. Eels have the ability to find suitable living environments, and suitable environments can promote their growth. Under artificial breeding conditions, they are fed formulated feed, as well as freshwater mussel meat, earthworms, fly larvae, small miscellaneous fish, and animal offal.

[0003] Traditional ecological rice paddies provide an environment suitable for the growth and development of eels. Rice helps maintain water quality and provides abundant natural food for eels, making them a significant source of wild-caught eels. However, modern rice cultivation methods have altered the rice paddy environment, making it unsuitable for eel growth. The extensive use of pesticides and fertilizers has led to a decrease in wild animals and burrows, soil compaction, and a decline in eel populations, even to the point of extinction. When eel fry are artificially released into rice paddies, their weak burrowing ability makes it difficult to find suitable burrows, resulting in a significant risk of low survival rates. Rice paddy eel farming faces serious challenges; the method of directly releasing fry into rice paddies often cannot achieve the same balance as rice cultivation and requires further improvement. Summary of the Invention

[0004] This invention provides a device for raising eels in rice paddies, which can solve the problems of difficulty in digging holes and the harmful effects of pesticides and fertilizers in raising eels in rice paddies. This invention provides artificial nests for eels, which can also prevent the harm caused by pesticides, fertilizers and sun-drying of the field to the eels, thereby improving the survival rate of the raised eels.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] This invention provides an apparatus for raising eels in rice paddies, comprising an annular ditch (4), multiple eel nests (8), and a multifunctional box (7). The annular ditch (4) is located between the paddy field ridges (2) and small ridges (3) around the rice paddy (1). The multiple eel nests (8) are located within the annular ditch (4), and the multifunctional box (7) is located on the paddy field ridges (2) around the rice paddy (1). The multifunctional box (7) delivers the required feed, water, and air to the multiple eel nests (8) through a main pipe (6).

[0007] The eel nest (8) includes a nest body (8-1), two S-shaped outlet structures (8-2), and a nest tube (8-3). The nest body (8-1) is a flat tubular structure, allowing the farmed eels to freely turn around within it. The two S-shaped outlet structures (8-2) are connected to both ends of the nest body (8-1). Each S-shaped outlet structure (8-2) is a funnel-shaped structure and includes interconnected curved neck structures (8-4). The curved cylindrical tube structure (8-5) is connected to the nest body (8-1). A floating door (8-7) is provided at the opening (8-6) of the curved cylindrical tube structure (8-5). The cross-sectional size of the floating door (8-7) is larger than the cross-sectional size of the hole (5) at the edge of the small embankment (3) around the paddy field (1). The nest tube (8-3) is set perpendicular to the nest body (8-1), with one end connected to the nest body (8-1) and the other end connected to the main pipe (6).

[0008] In an optional embodiment of the present invention, the nest body (8-1) has a thickness of 5 to 10 cm and a length of 30 to 80 cm.

[0009] In an optional embodiment of the present invention, the curved neck structure (8-4) facing the nest body (8-1) is a flat structure.

[0010] In an optional embodiment of the present invention, the multifunctional box (7) includes a base (7-1), an air pump (7-2), a hopper (7-3), a discharge valve (7-5), a barometer (7-4), a branch pipe (7-6), and a pressure regulating valve (7-7); the air pump (7-2) is fixed on the base (7-1), the air pump (7-2), the hopper (7-3), and the barometer (7-4) are all connected to the main pipe (6), the discharge valve (7-5) is provided at the bottom of the hopper (7-3), the main pipe (6) is connected to the branch pipe (7-6), and the pressure regulating valve (7-7) is provided on the branch pipe (7-6).

[0011] In an optional embodiment of the present invention, the barometer includes an air guide tube (7-41), a gas-liquid tank (7-42), a liquid guide tube (7-43), a scale column (7-44), a pressure regulating bladder (7-45), and a pressure valve (7-46); one end of the air guide tube (7-41) is connected to the upper left part of the gas-liquid tank (7-42), and the other end of the air guide tube (7-41) is connected to the main pipe (6); the pressure valve (7-46) is provided on the air guide tube (7-41); the liquid guide tube (7-43) is connected to the bottom right side of the gas-liquid tank (7-42); the scale column (7-44) is located on the upper part of the liquid guide tube (7-43); and the pressure regulating bladder (7-45) is connected to the top of the scale column (7-44).

[0012] The main pipe (6) pressurizes air into the gas-liquid tank (7-42) through the air guide pipe (7-41), so that the liquid in the gas-liquid tank (7-42) is pressed into the scale column (7-44) through the liquid guide pipe (7-43) at its bottom. The function of the pressure regulating bladder (7-45) connected to the top of the scale column (7-44) is to release the air pressure on the scale column (7-44). The pressure regulating valve (7-7) is adjusted according to the water depth below the surface of the paddy field (1) where the eel nest is located, so that the horizontal surface in the scale column (7-44) rises to the water depth where the eel nest (8) is located.

[0013] In one optional embodiment of the present invention, the liquid guide tube (7-43) has an L-shaped structure.

[0014] Beneficial Effects: This invention provides a device for raising eels in rice paddies, including an annular ditch, multiple eel nests, and a multifunctional box. The annular ditch is located between the paddy field ridges and small embankments around the rice paddy, the multiple eel nests are located within the annular ditch, and the multifunctional box is located on the paddy field ridges around the rice paddy. The multifunctional box delivers the necessary feed, water, and air to the multiple eel nests through a main pipe. Each eel nest includes a nest body, two S-shaped outlet structures, and a nest tube. The nest body is a flat, tubular structure, allowing the farmed eels to freely turn and maneuver within it. The two S-shaped outlet structures are connected to both ends of the nest body, and the nest tube is perpendicular to the nest body, with one end connected to the nest body and the other end connected to the main pipe. This invention provides artificial nests for eels in modern rice paddies, facilitating feeding and management of the farmed eels, is unaffected by chemical fertilizers and pesticides, does not interfere with mechanized rice harvesting, and promotes eel growth and increased rice yield. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a device for rice paddy eel farming provided in an embodiment of this application.

[0017] Figure 2 This is a partial structural schematic diagram of a device for rice paddy eel farming provided in an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the eel nest structure of an apparatus for raising eels in rice paddies, provided in an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the nest structure of an eel nest provided in an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of an S-shaped outlet structure for an eel nest provided in an embodiment of this application.

[0021] Figure 6 A schematic diagram of a multifunctional box structure for a rice paddy eel farming device provided in this application embodiment.

[0022] Figure 7 This is a schematic diagram of the barometer structure of a multi-functional box provided in an embodiment of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] like Figures 1 to 7 As shown, this embodiment of the invention provides a device for eel farming in rice paddies, including an annular ditch 4, multiple eel nests 8, and a multi-functional box 7. The annular ditch 4 is located between the paddy field ridges 2 and small ridges 3 surrounding the rice paddy 1. The multiple eel nests 8 are located within the annular ditch 4, and the multi-functional box 7 is located on the paddy field ridges 2 surrounding the rice paddy 1. The multi-functional box 7 delivers the necessary feed, water, and air to the multiple eel nests 8 through a main pipe 6. In this embodiment, the rice paddy 1 used for eel farming is modified. An annular ditch 4 is dug around the rice paddy 1, with a width of about 1 meter and a depth of 40-50 centimeters. Small ridges 3 are located outside the annular ditch 4, with a narrow plane 20 centimeters wide on one side of the annular ditch 4, and are on the same plane as the rice paddy. The small ridges 3 are about 15 centimeters higher than the rice paddy, facilitating personnel movement. No rice is planted within the annular ditch 4. There is a gap in the small embankment 3, so that when the paddy field is drained, the forage organisms inside can retreat into the annular ditch 4 to survive.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the eel nest 8 includes a nest body 8-1, two S-shaped outlet structures 8-2, and a nest tube 8-3. The nest body 8-1 is a flat tubular structure with a thickness of 5-10 cm and a length of 30-80 cm. Farmed eels can freely turn around within the nest body 8-1. The two S-shaped outlet structures 8-2 are connected to both ends of the nest body 8-1. Each S-shaped outlet structure 8-2 is funnel-shaped and includes an interconnected curved neck structure 8-4 and a curved cylindrical structure 8-5. The curved neck structure 8-4 is connected to the nest body 8-1 and is flat on the side facing the nest body 8-1. The curved cylindrical structure 8-5 is an upwardly curved cylindrical tube. A floating door 8-7 is provided at the opening 8-6 of the curved cylindrical structure 8-5. The cross-sectional dimension of the floating door 8-7 is larger than the cross-sectional dimension of the opening 5 at the edge of the small embankment 3 around the paddy field 1. The depth between the opening 8-6 of the curved cylindrical structure 8-5 and the nest body 8-1 is 10-20 cm. When the water level recedes from the opening, the floating door 8-7 covers the opening 5, facilitating fertilization and pesticide application; when the water level submerges the opening 5, the floating door 8-7 is fully open, allowing the eels to swim in and out to rest and forage. The nest tube 8-3 is located at one end of the nest body 8-1, perpendicular to the nest body 8-1, with one end connected to the nest body and the other end connected to the main pipe 6. Water and air can be supplied to the eel nest 8 through the nest tube 8-3.

[0026] like Figure 6 and Figure 7 As shown, the multi-functional box 7 includes a base 7-1, an air pump 7-2, a hopper 7-3, a discharge valve 7-5, a barometer 7-4, a branch pipe 7-6, and a pressure regulating valve 7-7. The air pump 7-2 is fixed on the base 7-1. The air pump 7-2, hopper 7-3, and barometer 7-4 are all connected to the main pipe 6. The discharge valve 7-5 is installed at the bottom of the hopper 7-3. The main pipe 6 is connected to a branch pipe 7-6, and the pressure regulating valve 7-7 is installed on the branch pipe 7-6. The air pump 7-2 can directly supply air or provide conveying power. For the eel nest 8, a higher flow rate of material is not necessarily better, as it will drive away the eels inside. Therefore, the pressure of the conveyed material is regulated by the barometer 7-4. The pressure regulating valve 7-7 is located after the barometer 7-4 and is used to regulate the flow rate and air pressure of the main pipe 6. When supplying gas to the eel nest 8, adjust the pressure regulating valve 7-7 so that the gas can slowly flow out of the eel nest 8.

[0027] The barometer includes a gas delivery tube 7-41, a gas-liquid tank 7-42, a liquid delivery tube 7-43, a scale column 7-44, a pressure regulating bladder 7-45, and a pressure valve 7-46. One end of the gas delivery tube 7-41 is connected to the upper left part of the gas-liquid tank 7-42, and the other end is connected to the main pipeline 6. The pressure valve 7-46 is installed on the gas delivery tube 7-41. The liquid delivery tube 7-43 is connected to the bottom right side of the gas-liquid tank 7-42, the scale column 7-44 is located on the upper part of the liquid delivery tube 7-43, and the pressure regulating bladder 7-45 is connected to the top of the scale column 7-44. The liquid delivery tube 7-43 is preferably of an L-shape.

[0028] The main pipe 6 pressurizes air into the gas-liquid tank 7-42 through the air guide pipe 7-41, causing the liquid in the gas-liquid tank 7-42 to be pressed into the scale column 7-44 through the liquid guide pipe 7-43 at its bottom. The function of the pressure regulating bladder 7-45 connected to the top of the scale column 7-44 is to release the air pressure on the scale column 7-44. The pressure regulating valve 7-7 is adjusted according to the water depth below the surface of the paddy field 1 where the eel nest is located, so that the horizontal level in the scale column 7-44 rises to the water depth where the eel nest 8 is located.

[0029] During operation, open the pressure regulating valve 7-7, then open the air pressure valve 7-46. Slowly reduce the pressure regulating valve 7-7. The air pressure in the main pipeline 6 will gradually increase, and the pressure in the gas-liquid tank 7-42 will also gradually increase. The liquid level in the scale column 7-44 will rise. Stop adjusting when the rise reaches the depth of the eel. At this point, the pressure is just right to cause gas to slowly flow out of the eel nest 8, which will aerate and oxygenate the eel nest 8. To transport liquid, there is a vertical pipe at the end of the main pipeline 6. Adjust the pressure regulating valve 7-7 until water flows out from the upper end of the vertical pipe.

[0030] Eel nests 8 are buried under small embankments 3. The opening of the eel nest 8 is located in a narrow plane, extending into the paddy field, level with or slightly lower than the paddy field. Nest tubes 8-3 are located on one side of the annular ditch 4. After multiple eel nests 8 are buried, they are connected by a main pipe 6. This connection on one side of the annular ditch 4 facilitates easy removal when catching eels. After the rice seedlings are planted, the water level is controlled at around 10 cm. After the eel fry are released, attractants are supplied to the eel nests 8 through a multi-functional box 7. The attractant can be made by mixing liver or fishmeal with water, and the amount supplied is such that a small amount flows out from the nest opening, thus attracting eels into the nest. When artificially feeding, the feed is placed on both sides of the small embankment 3.

[0031] Example 1

[0032] There are approximately 3 mu of paddy fields, which are suitable for raising eels, thus realizing the integration of planting and breeding. The technical solution of a paddy field eel farming device according to the above embodiment is implemented.

[0033] The paddy fields selected for eel farming were modified by digging a circular ditch around the perimeter of the paddy field. The ditch was approximately 1 meter wide and 40 centimeters deep. A small embankment, about 20 centimeters wide, was built on the outer side of the ditch, level with the paddy field. This embankment was about 15 centimeters higher than the paddy field to facilitate walking. No rice was planted in the ditch. There were openings in the embankment. After the rice seedlings were planted, the water level was maintained at about 10 centimeters. After the eel fry were released, an attractant was supplied to the nests via a multi-functional box. The attractant could be made by mixing liver or fishmeal with water, and the amount supplied was such that a small amount flowed out from the nest opening, thus luring the eels into the nests. When feeding, the feed was placed on both sides of the embankment. After the paddy field was drained, the feed organisms could retreat into the circular ditch to survive. After the rice harvest, when the weather is warm, the rice paddies are flooded and the rice is fed until it stops feeding. At this point, the water in the circular ditch is drained and the eels are caught. The yield and survival rate are significantly higher than when the rice seedlings are released directly into the paddy fields (P<0.01).

[0034] Example 2

[0035] There are approximately 5 mu of paddy fields, which are suitable for raising eels, thus realizing a combination of planting and breeding. The technical solution of a paddy field eel farming device according to the above embodiment is implemented.

[0036] The paddy fields selected for eel farming were modified by digging a circular ditch around the perimeter of the paddy field. The ditch was approximately 1 meter wide and 50 centimeters deep. A small embankment, about 20 centimeters wide, was built on the outer side of the ditch, level with the paddy field. This embankment was about 15 centimeters higher than the paddy field to facilitate walking. No rice was planted within the circular ditch. There were openings in the embankments. After the paddy field was drained, the feed organisms could retreat into the circular ditch. After the rice seedlings were planted, the water level was maintained at about 10 centimeters. After the eel fry were released, an attractant was supplied to the nests via a multi-functional box. The attractant could be made by mixing liver or fishmeal with water, and the amount supplied was such that a small amount flowed out from the nest opening, thus luring the eels into the nests. When feeding artificially, the feed was placed on both sides of the embankment. After the rice harvest, when the temperature is low, draining the water from the circular ditch and catching eels at this time significantly improves the yield and survival rate compared to directly releasing rice seedlings into the paddy field (P<0.01).

[0037] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A device for rice paddy eel farming, characterized in that, The system includes a ring-shaped ditch (4), multiple eel nests (8), and a multi-functional box (7). The ring-shaped ditch (4) is set between the paddy field ridges (2) and small ridges (3) around the paddy field (1). The multiple eel nests (8) are set inside the ring-shaped ditch (4), and the multi-functional box (7) is set on the paddy field ridges (2) around the paddy field (1). The multi-functional box (7) delivers the required food, water, and air to the multiple eel nests (8) through the main pipe (6). The eel nest (8) includes a nest body (8-1), two S-shaped outlet structures (8-2), and a nest tube (8-3). The nest body (8-1) is a flat tubular structure, allowing the farmed eels to freely turn around within it. The two S-shaped outlet structures (8-2) are connected to both ends of the nest body (8-1). Each S-shaped outlet structure (8-2) is a trumpet-shaped structure, comprising interconnected curved neck structures (8-4) and curved round tubes. Structure (8-5), the curved neck structure (8-4) is connected to the nest body (8-1), the opening (8-6) of the curved round tube structure (8-5) is provided with a floating door (8-7), the cross-sectional dimension of the floating door (8-7) is larger than the cross-sectional dimension of the hole (5) at the edge of the small embankment (3) around the paddy field (1); the nest tube (8-3) is set perpendicular to the nest body (8-1), one end of the nest tube (8-3) is connected to the nest body (8-1), and the other end is connected to the main pipe (6); The multi-functional box (7) includes a base (7-1), an air pump (7-2), a hopper (7-3), a discharge valve (7-5), a barometer (7-4), a branch pipe (7-6), and a pressure regulating valve (7-7). The air pump (7-2) is fixed on the base (7-1). The air pump (7-2), the hopper (7-3), and the barometer (7-4) are all connected to the main pipe (6). The discharge valve (7-5) is provided at the bottom of the hopper (7-3). The main pipe (6) is connected to the branch pipe (7-6). The pressure regulating valve (7-7) is provided on the branch pipe (7-6).

2. The apparatus for rice paddy eel farming according to claim 1, characterized in that, The nest (8-1) is 5-10 cm thick and 30-80 cm long.

3. The apparatus for rice paddy eel farming according to claim 1, characterized in that, The curved neck structure (8-4) is flat on the side facing the nest body (8-1).

4. The apparatus for rice paddy eel farming according to claim 1, characterized in that, The barometer includes an air guide tube (7-41), a gas-liquid tank (7-42), a liquid guide tube (7-43), a scale column (7-44), a pressure regulating bladder (7-45), and a pressure valve (7-46). One end of the air guide tube (7-41) is connected to the upper left part of the gas-liquid tank (7-42), and the other end of the air guide tube (7-41) is connected to the main pipe (6). The pressure valve (7-46) is installed on the air guide tube (7-41). The liquid guide tube (7-43) is connected to the bottom right side of the gas-liquid tank (7-42). The scale column (7-44) is located on the upper part of the liquid guide tube (7-43), and the pressure regulating bladder (7-45) is connected to the top of the scale column (7-44). The main pipe (6) pressurizes air into the gas-liquid tank (7-42) through the air guide pipe (7-41), so that the liquid in the gas-liquid tank (7-42) is pressed into the scale column (7-44) through the liquid guide pipe (7-43) at its bottom. The function of the pressure regulating bladder (7-45) connected to the top of the scale column (7-44) is to release the air pressure on the scale column (7-44). The pressure regulating valve (7-7) is adjusted according to the water depth below the surface of the paddy field (1) where the eel nest is located, so that the horizontal surface in the scale column (7-44) rises to the water depth where the eel nest (8) is located.

5. The apparatus for rice paddy eel farming according to claim 4, characterized in that, The liquid guide tube (7-43) has an L-shaped structure.

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