Comprehensive planting and breeding method for rice, ducks and shrimps

Abstract

The invention discloses a comprehensive planting and breeding method for rice, ducks and shrimps, and belongs to the field of agricultural production.The comprehensive planting and breeding method for rice, ducks and shrimps specifically comprises the steps that freshwater shrimps and macrobrachium rosenbergii are bred in a rice field in the first half year, and rice is planted and sheldrakes are bred in the second half year. According to the comprehensive planting and breeding method, the omnivorous characteristics of the freshwater shrimps and the macrobrachium rosenbergii are fully utilized, and the number of algae and other aquatic organisms in the rice field is reduced. Excrement of the shrimps can increase soil fertility and reduce the use amount of chemical fertilizer in the rice field; the ducks can prey on duckweed, aquatic plants and rice diseases and pests, eggs laid by the ducks can also increase income for farmers, and'five purposes in one water and five harvests in one field 'are achieved.

Description

Technical Field

[0001] This invention belongs to the field of agricultural technology, and in particular relates to a method for integrated rice-duck-shrimp farming. Background Technology

[0002] Rice-duck co-cultivation and rice-shrimp co-cultivation, as representatives of ecological farming, aim to achieve the goal of "multiple uses of water and multiple harvests from one field," improving resource utilization efficiency and economic benefits. Rice-duck co-cultivation uses ducks to control weeds and pests, reducing pesticide use, while duck manure serves as organic fertilizer to promote rice growth. Rice-shrimp co-cultivation utilizes the water in rice paddies to raise crayfish, increasing the added value of the land. However, these existing models still have some shortcomings that restrict their widespread application and maximization of benefits.

[0003] First, the main drawbacks of rice-duck co-cultivation (such as the Chinese patent published as CN107018835A) in practice lie in the complexity of duck management and uneven resource utilization. Improper timing of duck release can easily damage rice seedlings, affecting early growth. Simultaneously, the limited activity range of ducks makes it difficult to cover the entire paddy field, resulting in uneven weed and pest control and requiring additional manual intervention, increasing costs. Furthermore, while duck manure can fertilize the field, excessive accumulation may lead to eutrophication of water bodies, increasing environmental risks. Second, rice-shrimp co-cultivation faces the dual challenges of low seedling density control and inefficient biological pest and disease control. In traditional rice-shrimp farming (such as the Chinese patent published as CN107494093A), precise control of shrimp seedling density is difficult, often leading to overcrowding or resource waste and disease transmission. At the same time, the symbiosis between rice and shrimp lacks a dynamic adjustment mechanism. For example, after shrimp seedling release, feed feeding rates require meticulous manual management, but errors often occur in practice, affecting overall yield and quality. More seriously, the single-model approach to space utilization is insufficient. For example, while the design of circular ditches and fish collection pits optimizes drainage, it fails to integrate poultry resources, resulting in idle space and time resources in paddy fields. Returning straw to the field may also have side effects (such as soil acidification). These defects not only reduce economic benefits but also hinder the full implementation of the "double reduction" (reduction of chemical fertilizers and pesticides) goals.

[0004] To address the aforementioned issues, existing technologies have explored some integrated farming models, such as rice-shrimp-turtle-fish-duck polyculture or duck-crayfish-rice integrated methods, which optimize the ecological cycle through multi-species synergy. Another example is a Chinese patent (publication number CN103960100A) entitled "A Method for Integrated Rice-Duck and Shrimp Farming in Rice Paddies," which discloses a method including the following steps: rice paddy preparation – selection of rice seeds, ducklings, and broodstock shrimp – rice cultivation – duckling introduction into the paddy – broodstock shrimp introduction into the paddy – field management – ​​attracting ducks out of the paddy – rice harvesting – adult shrimp harvesting, achieving an increased profit of over 3,000 yuan per mu. However, these methods still have certain limitations: the species combination does not fully consider the mutual exclusion between ducks and shrimp; ducklings introduced too early may prey on shrimp larvae, requiring strict phased management (e.g., introducing ducklings 20 days after shrimp larvae grow), increasing operational complexity; and the addition of fertilizer and feed relies on manual judgment, lacking standardized procedures, which can easily lead to resource waste or environmental pollution, resulting in insufficient profit increases. Therefore, there is an urgent need for an innovative integrated rice-duck-shrimp farming method that combines the pest control advantages of ducks with the economic value of shrimp. By systematically optimizing the timing of farming, spatial layout, and resource recycling, it is possible to overcome existing shortcomings and achieve a balance between high efficiency, ecology, and economy. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a method for integrated rice-duck-shrimp farming.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A rice-duck-shrimp integrated farming method involves rotating the raising of freshwater shrimp and giant freshwater prawns in rice paddies during the first half of the year, and raising ducks while planting rice during the second half of the year.

[0007] Furthermore, the rice-duck-shrimp integrated farming method includes the following steps: S1. Disinfect the paddy field, excavate the bottom mud of the paddy field and raise the pond embankment to maintain the paddy field depth at 0.8-1m; S2. In late February, shrimp larvae were released and vitamin C was applied to improve the survival rate. During the shrimp farming period, the water level was maintained at 0.6-0.8 meters, the water transparency was ≥0.4m, and the dissolved oxygen was ≥5mg / L. S3. Starting at the end of April, use special fishing equipment to catch fresh shrimp, catching the big ones and leaving the small ones, until the pond is drained in early May; S4. After the freshwater prawns are harvested, fill the water and release giant freshwater prawn larvae; during the rearing period, ensure dissolved oxygen ≥7mg / L; add sea salt crystals to control the salinity of the water at 0.8‰; S5. In early July, the special fishing device described above is used to catch giant freshwater prawns; S6. After the giant freshwater prawns are harvested from the dry pond, some of the soil from the previously raised pond embankment is dug into the paddy field. After leveling, rice seedlings are transplanted, and nitrogen fertilizer is applied after the seedlings are planted. S7. One month after the rice seedlings are planted, one-month-old female ducks are released into the water at a density of 20 ducks per mu. S8. Rice harvesting begins in mid-November. After the rice is harvested, ducks are released back into the rice paddies for free-range raising until they are removed from the paddies the following year before the release of freshwater shrimp.

[0008] As an optional solution of the present invention, the paddy field should be selected from flat areas with good water retention and convenient irrigation and drainage, and the surrounding water sources should be abundant, unpolluted, and of excellent quality to provide a good environment for shrimp growth.

[0009] As an optional embodiment of the present invention, the stocking specification of the freshwater prawn larvae is 1000 prawns / kg, and the stocking density is 32kg / mu; the stocking specification of the giant freshwater prawn larvae is 100 prawns / kg, and the stocking density is 36kg / mu.

[0010] As an optional solution of the present invention, the method of disinfecting the paddy field is as follows: expose the paddy field to the sun for 7 days, and then sprinkle quicklime at an average rate of 75 kg per mu to eliminate pathogens, parasite eggs and wild fish in the paddy field, thereby creating a safe environment for the breeding of shrimp fry.

[0011] As an optional embodiment of the present invention, after disinfection of the paddy field, the step of erecting a bird-proof net is also included. The bird-proof net is erected above the paddy field at a height level with the pond embankment, with one side of the net allowed to be opened while the others are fixed in place. This prevents the spread of diseases and yield reduction caused by birds preying on the shrimp during later stages of aquaculture, and also facilitates later management of the prawns.

[0012] As an optional embodiment of the present invention, the amount of nitrogen fertilizer applied in step S6 is 10 kg / mu, and no further fertilizer is applied in the later stages.

[0013] As an optional embodiment of the present invention, the shrimp are fed pelleted feed during the shrimp farming period, with the feed amount being 5% of the shrimp's weight, fed once in the morning and once in the evening, and evenly sprinkled around the pond embankment.

[0014] As an optional embodiment of the present invention, the giant freshwater prawns are fed pelleted feed or specialized giant freshwater prawn feed during the farming period, twice a day, morning and evening, with a total daily feed amount of approximately 5% of the prawns' weight, and a morning-to-evening feeding ratio of 2:3. Feeding activity is monitored regularly via a feeding platform, and lactic acid bacteria are added as needed based on uneaten feed to promote consumption.

[0015] Preferably, the dedicated fishing device includes a collection area and a fishing area; the collection area is supported by a circular metal frame; the fishing area is supported by a square metal frame; each support frame is fixedly connected to an externally wrapped fishing net, and two adjacent support frames and the externally wrapped fishing net constitute a fishing unit; each fishing unit in the fishing area has a hole on the same side; and the fishing net on the side with the hole is recessed inward to form a conical cavity with the hole.

[0016] Each fishing unit in the collection and fishing areas is 0.5m in length.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: This invention presents an innovative integrated rice-duck-shrimp farming method, an innovative ecological agricultural model. In the first half of the year, freshwater prawns and giant freshwater prawns are raised sequentially in rice paddies, while in the second half, rice is planted and ducks are raised simultaneously. This fully utilizes the omnivorous characteristics of both freshwater prawns and giant freshwater prawns, reducing the amount of algae and other aquatic organisms in the rice paddies. Simultaneously, the shrimp excrement increases soil fertility, reducing the amount of chemical fertilizers used in the rice paddies. Furthermore, freshwater prawns and giant freshwater prawns have different environmental requirements; rotational farming avoids resource competition and instead creates an ecological relay: freshwater prawns prefer low-temperature environments, are suitable for early spring farming, have a longer growth cycle, and mainly feed on bottom organic debris and algae, helping to purify water quality. Giant freshwater prawns prefer high temperatures, grow rapidly in summer, have a short farming cycle, and can efficiently utilize the nutrient-rich substrate and water space left after the freshwater prawn harvest. Through staggered farming, it avoids the accumulation of diseases and soil degradation caused by continuous cropping of single species, and extends the economic output period of the rice paddies. Raising Muscovy ducks during rice cultivation creates a virtuous cycle where the ducks' natural activity in the paddy fields replaces some of the manual and chemical inputs. Muscovy ducks readily consume tender shoots of weeds, especially dicotyledonous weeds, and their trampling action inhibits weed growth, reducing or even eliminating the need for herbicides. Ducks prey on pests such as golden apple snails, rice planthoppers, and rice leaf rollers, effectively reducing pest incidence and pesticide use. Duck manure, rich in nitrogen, phosphorus, and potassium, is a high-quality organic fertilizer that can replace some chemical fertilizers, improving soil fertility. The ducks' movement in the fields helps with cultivation, loosening the soil, and oxygenation, promoting rice root development, increasing thousand-grain weight and maturity, and ultimately boosting rice yield and income. Furthermore, the eggs laid by the ducks provide additional income for farmers, achieving "five uses from one water source and five harvests from one field." Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the special fishing device in an embodiment of the present invention; Among them, 1-fishing area; 2-collection area; 3-square metal frame; 4-round metal frame; 5-hole. Detailed Implementation

[0020] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0021] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0022] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0023] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0024] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0025] A schematic diagram of the special fishing tool used in this embodiment of the invention is shown below. Figure 1 The system includes a collection area and a fishing area. The collection area is supported by a circular metal frame, while the fishing area is supported by a square metal frame. Each support frame is fixedly connected to an external fishing net, and two adjacent support frames and the external fishing net constitute a fishing unit. Each fishing unit in the fishing area has a mesh opening on the same side, and the side of the net with the mesh opening is concave, forming a conical cavity with the mesh. The mesh is 20cm in diameter and 20cm deep. The distance between any two adjacent support frames in the collection and fishing areas is 50cm. The mesh size of the fishing net is determined according to the size of the freshwater prawns and giant freshwater prawns; 1cm can be selected for freshwater prawns, and 2cm for giant freshwater prawns.

[0026] It should be noted that any aspects not described in detail in the embodiments of the present invention can be addressed using conventional techniques in the field and are not key points of the invention, and will not be elaborated upon here.

[0027] Example 1 A method for integrated rice-duck-shrimp farming includes the following steps: S1, Rice paddy preparation Select a 2-acre paddy field with flat terrain, good water retention, and convenient irrigation and drainage; ensure that the surrounding water source is sufficient, unpolluted, and of excellent quality to provide a good environment for shrimp growth. Modify the paddy field by dredging the bottom mud and raising the dikes to maintain the paddy field depth at 0.8-1 meter.

[0028] S101. Disinfection of paddy fields After exposing the paddy fields to the sun for 7 days, 75 kg of quicklime per mu (approximately 0.067 hectares) is sprayed to eliminate pathogens, parasite eggs, and wild fish in the paddy fields, creating a safe environment for shrimp fry farming.

[0029] S102. Install bird protection netting. Bird-proof netting is erected above the paddy field at the same height as the pond embankment. One side of the netting can be opened while the others are fixed. This prevents the spread of diseases and reduced yields caused by birds preying on the shrimp during the later stages of aquaculture, and also facilitates the management of the prawns in the later stages.

[0030] S2, Shrimp Farming Management S201. Release of shrimp larvae In late February, on a sunny day, stock the shrimp larvae at a size of 1000 shrimp / kg, at a rate of 32kg per mu (approximately 0.067 hectares). Immediately after stocking, apply Vitamin C at a rate of 250g per mu to prevent stress-induced shrimp mortality and improve survival rates.

[0031] S202. Feeding During the rearing period, feed the shrimp with commercially available pelleted feed (30%-36% protein content), at a rate of 5% of the shrimp's weight per day, twice a day, morning and evening, evenly sprinkled around the pond embankment. Build a feeding platform, check the feeding situation two hours after feeding, and adjust the feeding amount accordingly based on the amount of uneaten feed.

[0032] S203. Water Quality Control During the shrimp farming period, the water level should be maintained at 0.6-0.8 meters, the water transparency should be ≥0.4m, and the dissolved oxygen should be ≥5mg / L. The ammonia nitrogen and nitrite levels in the water should be tested regularly, and beneficial bacteria should be used to adjust the water quality in a timely manner according to the data changes. Water should be added 2cm every half month.

[0033] S204. Other Management Bottom aeration should be activated during the rearing period. The pond should be inspected daily, morning and evening, to observe the shrimp shell color and growth. If any abnormalities are found in the shrimp's appearance, the feeding strategy should be adjusted, quicklime should be applied, and photosynthetic bacteria (Rhodopseudomonas erythrosporum liquid, containing ≥1×10⁻⁶ live bacteria per liter) should be used. 9 Apply 3L / mu to the pond to regulate water quality and ensure the survival rate of freshwater shrimp during the low temperature period in early spring.

[0034] S205. Harvest Specialized fishing equipment was used to harvest freshwater shrimp starting at the end of April, catching the larger ones and leaving the smaller ones to grow. The ponds were drained by early May. The average yield per mu (approximately 0.16 acres) reached 64 kg of freshwater shrimp, with an average size of 4.7 g / s. Relevant data are shown in Table 1. Table 1. Data on shrimp stocking and harvesting S3, Giant Freshwater Prawn Farming Management S301. Release of Giant Freshwater Prawn Larvae After the freshwater prawn harvest is completed, the area is filled with water. On a sunny day, large-sized giant freshwater prawn larvae are released at a rate of 100 prawns / kg, at a rate of 36kg per mu (approximately 0.067 hectares).

[0035] S302. Feeding Starting the day after stocking, begin feeding the prawns with a specialized feed containing 32%-36% protein, twice a day, morning and evening. The total daily feed amount should be approximately 5% of the prawns' weight, with a morning-to-evening feeding ratio of 2:3. Regularly monitor feeding activity through the feeding station and add lactic acid bacteria as needed (refer to the packaging instructions for the amount added) to promote digestion.

[0036] S303. Water Quality Control During the aquaculture period, bottom aeration should be kept on throughout. After entering June, additional aeration facilities should be turned on to ensure dissolved oxygen ≥7mg / L. During the aquaculture period, sea salt crystals should be added to control the salinity of the water at around 0.8‰.

[0037] S304. Other Management Conduct pond inspections every morning and evening to observe the shrimp shell color and growth. If any abnormalities are found in the shrimp's appearance, adjust the feeding strategy, sprinkle quicklime, and use photosynthetic bacteria (Rhodopseudomonas erythrosporum solution, containing ≥1×10⁻⁶ live bacteria per liter). 9 When applied to the pond at a rate of 3L / mu, no diseases occurred during the aquaculture period.

[0038] S305. Harvest Harvesting began in early July using specialized equipment, yielding an average of 96 kg of giant freshwater prawns per mu (approximately 0.16 acres), with an average size of 45 g / prawn. Relevant data are shown in Table 2. Table 2. Stocking and harvesting data of giant freshwater prawns S4, Rice-Shrimp Co-cultivation S401. Rice cultivation After harvesting the giant freshwater prawns from the drained ponds, some of the soil from the previously raised pond embankments was dug into the paddy fields. After leveling the fields, rice seedlings were transplanted when the weather was suitable. High-yielding japonica rice varieties with lodging resistance, short growth periods, and good taste were selected as rice seedlings. Nitrogen fertilizer was applied at a rate of 10 kg per mu (approximately 0.067 hectares) after transplanting, and no further fertilizer was applied.

[0039] S402. Free-range Muscovy ducks One week after the rice seedlings are planted, female Muscovy ducks, about one month old, are released into the paddy fields at a rate of 20 ducks per acre. The ducks can effectively control the growth of duckweed and aquatic plants in the paddy fields, and they can also prey on rice pests and diseases. The ducks' constant swimming also increases the oxygen content in the water.

[0040] S403. Daily Management During the rice-duck farming season, the water depth in the paddy fields is managed according to conventional rice cultivation practices. The ducks are fed primarily aquatic plants, supplemented with milled rice. The rice growth is monitored regularly, and once the rice heads emerge, the ducks are moved from the paddy fields to the irrigation ditches to prevent them from preying on the rice grains. Duck sheds are built on the paddy field embankments to provide them with a habitat. From the late tillering stage to the early panicle differentiation stage, the fields are dried in a timely manner to promote root development and panicle growth.

[0041] S404. Harvest Rice harvesting began in mid-November, with an average yield of 450 kg of rice per mu (approximately 0.067 hectares). Analysis of the rice grains revealed total starch content, crude fat content, crude protein content, and dry matter content, as shown in Table 3. After the rice harvest, the ducks were reintroduced into the paddy fields (at which point the average weight of the ducks reached 2 kg) and raised until the end of February of the following year. Around mid-to-late December, the ducks began laying eggs, with an average of about 8 eggs per day for every 20 ducks. By the end of February of the following year, a total of approximately 500 eggs were harvested per mu.

[0042] Conventional rice grains refer to rice grains obtained through a planting method that only cultivates rice and does not raise freshwater prawns, giant freshwater prawns, or mallard ducks. The plot selection for conventional planting is adjacent to that in Example 1, and the rice variety, planting density, etc. are the same as in Example 1. The difference lies in the water and fertilizer management method: During the conventional rice planting period, following the principle of "early promotion, mid-term control, and late supplementation," in the early stage, to promote tillering, 7 kg of urea per mu should be applied 10 days after transplanting, along with 4 kg of potassium chloride; in the mid-term, to protect the panicles and increase grains, fertilizer should be applied at 4 kg of urea and 15 kg of potassium chloride per mu; in the late stage, to prevent aging and improve quality, a mixture of 1% urea and 0.2% potassium dihydrogen phosphate should be sprayed on the leaves twice, with an interval of 7 days between applications, while simultaneously applying 30 kg / mu of potassium silicate to improve lodging resistance.

[0043] Table 3 Nutrient Analysis of Rice Grains As can be seen from Table 3, the total starch, crude fat, crude protein and dry matter content of rice grains grown under the rice-shrimp rotation model are higher than those grown under the conventional method. Among them, the total starch content is 23.4% higher and the crude fat content is 14.7% higher.

[0044] The effectiveness of the integrated farming model in Example 1 was verified. 1. Economic benefits The input-output analysis of the experiment showed that the average cost per mu (a Chinese unit of area, approximately 0.067 hectares) of paddy field was 7,700 yuan, the income was 15,976 yuan, and the profit was 7,276 yuan, as detailed in Tables 4 and 5. Therefore, compared with simply planting rice, the income from paddy fields is significantly higher.

[0045] Table 4. Cost Analysis per Mu of Paddy Field Table 5. Analysis of per-acre yield and profit 2. Ecological benefits In the rice-shrimp-duck farming model, the use of chemical nitrogen fertilizer in paddy fields decreased by 90%, phosphorus fertilizer by 80%, and ammonia nitrogen and total phosphorus runoff emissions decreased by 38% and 45% respectively, significantly reducing the contribution to eutrophication of surrounding rivers and effectively protecting the ecological environment.

[0046] 3. Social benefits In this integrated farming model, rice cultivation is primarily managed by individual farmers, while shrimp farming utilizes short-term employment of aquaculture workers, effectively boosting the income of surrounding farmers. This model can also leverage a "cooperative + farmer" order mechanism, where farmers raise shrimp, while the cooperative is responsible for the unified purchase and sale of freshwater shrimp, giant freshwater prawns, rice, ducks, and duck eggs, driving high-quality green development of rice-fish farming.

[0047] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for integrated rice, duck and shrimp farming, characterized in that, In the first half of the year, the rice field is used to breed Macrobrachium Nipponense and Macrobrachium rosenbergii alternately, and in the second half of the year, the rice field is used to breed Muscovy duck while planting rice.

2. A method for integrated rice, duck and shrimp farming, characterized in that, The method comprises the following steps: S1. Sterilizing the rice field, digging out the bottom mud of the rice field and raising the dike, and keeping the depth of the rice field at 0.8-1m; S2. In late February, Macrobrachium Nipponense fry is released, and VC is sprayed to improve the survival rate; during the breeding of Macrobrachium Nipponense, the water level is kept at 0.6-0.8m, the water transparency is greater than or equal to 0.4m, and the dissolved oxygen is greater than or equal to 5mg / L; S3. In late April, the special fishing device is used to catch Macrobrachium Nipponense, and large ones are caught and small ones are left, and the rice field is dried in early May; S4. After the end of the breeding of Macrobrachium Nipponense, the rice field is filled with water, and Macrobrachium rosenbergii fry is released; during the breeding, the dissolved oxygen is kept greater than or equal to 7mg / L; sea water crystal is released to control the salinity of the water body to 0.8‰; S5. In early July, the special fishing device is used to catch Macrobrachium rosenbergii; S6. After the rice field is dried and the Macrobrachium rosenbergii is caught, the mud of the raised dike is dug into the rice field, and the rice seedlings are planted after being leveled; after the rice seedlings are planted, nitrogen fertilizer is applied; S7. One month after the rice seedlings are planted, one-month-old female Muscovy ducks are released and bred at a density of 20 per mu; S8. In mid-November, the rice is harvested, and after the rice is harvested, the Muscovy ducks are released into the rice field for breeding until they are moved out of the rice field before Macrobrachium Nipponense is released next year.

3. The method according to claim 2, wherein, The release specification of the Macrobrachium Nipponense fry is 1000 per kg, and the release density is 32kg per mu; the release specification of the Macrobrachium rosenbergii fry is 100 per kg, and the release density is 36kg per mu.

4. The method according to claim 2, wherein, The sterilization method of the rice field is to expose the rice field to the sun for 7 days, and spray 75kg of quicklime per mu.

5. The method according to claim 2, wherein the rice, duck and shrimp are raised in the same pond. After the rice field is sterilized, the step of building a bird net is further included.

6. The method according to claim 2, wherein, In step S6, the amount of nitrogen fertilizer applied is 10kg per mu, and no fertilizer is applied later.

7. The method according to claim 2, wherein the rice, duck and shrimp are raised in the same pond. During the breeding of Macrobrachium Nipponense, pellet feed is fed, and the feeding amount is 5% of the weight of the shrimps, which is fed twice in the morning and evening, and is uniformly sprayed along the four sides of the dike.

8. The method according to claim 2, wherein the rice, duck and shrimp are raised in the same pond. During the breeding of Macrobrachium rosenbergii, pellet feed is fed, and the feeding amount is 5% of the weight of the shrimps, which is fed twice in the morning and evening, and the proportion of morning and evening feeding is 2:

3.

9. The method according to claim 2, wherein, The special fishing device comprises a collection area and a fishing area; the collection area uses a circular metal frame as a support skeleton; the fishing area uses a square metal frame as a support skeleton; each support skeleton is fixedly connected with an externally wrapped fishing net, and adjacent two support skeletons and the externally wrapped fishing net constitute a fishing unit; the same side of each fishing unit of the fishing area is provided with a hole; and the fishing net on the side with the hole is inwardly recessed to form a conical cavity with the hole.

10. The rice, duck and shrimp integrated farming method according to claim 9, characterized in that, The length of each fishing unit of the collection area and the fishing area is 0.5m.

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