Method for intercropping shrimps and turtles in hilly rice field

Abstract

The invention provides a hilly rice field shrimp and snail intercropping method, and relates to the technical field of aquatic product ecological breeding. Comprising the following steps that a hilly type rice field producing area serves as a breeding unit, and a water storage area and a rice planting area are arranged in the breeding unit; the water storage area is provided with a diversion canal which is communicated with the rice planting area; in the rice planting period, snails are bred in a cage in the water storage area, and crayfish parent shrimps are bred in a fertilizer and water mode; after the rice is harvested, crayfish seedlings produced by crayfish seed shrimps and snail seedlings which do not reach the harvesting specification are put into the rice planting area to be bred. The space advantage of the hilly rice field is fully utilized, operations such as rice field drying and pesticide application are not affected, the rice yield per mu is guaranteed, management is easy, the growth speed of crayfish and snails is guaranteed in the water storage area in the earlier stage and in the rice field after harvesting in the later stage, biological bait is fully utilized, the manual operation and rice planting cost is greatly reduced, and the method is suitable for large-scale popularization and application. The culture benefit and the rice field utilization rate are obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aquatic ecological breeding, and particularly relates to a method for breeding shrimps and snails in hilly rice fields. Background Art

[0002] The meat of snails and crayfish is delicious and has been loved by the people in recent years.

[0003] There are some problems and shortcomings in the traditional methods of raising snails and shrimps in rice fields: snails are collectively referred to as ring-edge snails and round field snails, belonging to the prosobranchia of the gastropod class of the phylum Mollusca. They like to eat algae, residual bait, feces and other organic debris, and have relatively low requirements for the environment. Crayfish are very sensitive to water quality. During the breeding process, the growth of crayfish is affected by water quality and nutrition. Crayfish are omnivorous animals and like to eat juicy and tender plants and animal foods, including snails. Therefore, it is difficult to breed them together. In addition, raising snails in rice fields affects the drying of rice fields and the use of medicines. It is impossible to kill the golden apple snails in the snail-raising rice fields, and they can only be picked up manually, which is a heavy manual operation. The rice fields for shrimp farming have high requirements for water quality, so insecticides cannot be used, and the bottom environment will gradually deteriorate during the breeding process, affecting the yield of crayfish and rice. The drainage of rice fields for shrimp and snail farming is slow, and the shrimp and snails must be collected. The management is complicated and affects the time, so farmers can only grow one season of rice a year. In a mixed farming environment, it is necessary to comprehensively consider the growth conditions, disease prevention, water quality, etc. of the two species. Due to the differences in the growth cycle, food requirements, habitat water quality requirements, etc. of crayfish and snails, there are more complexities in farming management, so mixed farming is difficult to promote. In view of the above-mentioned shortcomings, how to carry out shrimp and snail farming in rice fields is an urgent problem that technicians in this field need to solve. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for cultivating shrimps and snails in hilly rice fields, which is environmentally friendly, resource-saving, and highly efficient in circulation; and greatly improves the breeding efficiency and rice field utilization rate.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present application provides a method for cultivating shrimps and snails in a hilly rice field, comprising the following steps:

[0007] A hilly rice field is used as a breeding unit, and a water storage area and a rice planting area are set in the breeding unit; the water storage area is located in the area with the highest terrain level in the breeding unit, and the terrain level of the rice planting area is lower than that of the water storage area; a diversion channel is set in the water storage area to communicate with the rice planting area;

[0008] During the rice planting period, snails are cultured in hanging cages in the water storage area, and crayfish brood are cultured in fertilized water;

[0009] After the rice is harvested, the crayfish seedlings produced by the crayfish breeders and the snail seedlings that have not reached the harvest specifications are released into the rice planting area for breeding.

[0010] Preferably, the area of ​​the rice planting area is 8 to 12 times the area of ​​the water storage area.

[0011] Preferably, the bottom part of the water storage area is arranged according to the shape of the water storage area, and is generally east-west oriented, with a width of 1.8 to 2.2 m and a height of 35 to 45 cm; the distance between the ridges is 0.8 to 1.2 m; the ridges of the water storage area are 0.8 to 1 m wide and 70 to 90 cm deep.

[0012] Preferably, the width of the ridge in the rice planting area is more than 80 cm, and the water storage depth is more than 40 cm.

[0013] Preferably, when snails are cultured in hanging cages in the water storage area, the density of the hanging cages is 90 to 110 per mu.

[0014] Preferably, when snail seedlings are released into the hanging cages in the water storage area, the release density is 500-800 snail seedlings per cage, and the snail seedling specifications are individual weights greater than 0.5g. When snail seeds are released into the hanging cages in the water storage area, the snail seeds release density is 100-120 snail seeds per cage.

[0015] Preferably, when breeding crayfish broodstock in the water storage area, the specification of the crayfish broodstock is 4-5g per tail, and the stocking density is 5000-6000 tails per mu.

[0016] Preferably, the crayfish seedlings produced by crayfish fry and snail seedlings that have not reached the harvest specifications are placed in the rice planting area for breeding and fertilized and water-cultivated seedlings before being cultivated; the fertilized and water-cultivated seedlings step includes: pouring soy milk into the water in the water storage area, the amount of which is 3 to 5 jin per mu.

[0017] Preferably, the specification of the crayfish seedlings is above 4g, and 4800-5200 seedlings are released per mu; the snail seedlings that have not reached the harvest specification are 0.3-1g, and the release density is 15-20kg per mu.

[0018] Preferably, the rice planting area is provided with 2 to 3 layers, and two seasons of rice are planted in the rice planting area from early April to late October.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention is mainly aimed at hilly rice fields. The highest plots of land are selected to set up water storage areas. During the rice planting period, snails are cultured in cages in the water storage areas, and crayfish broodstock are cultured with fertilized water. After the rice is harvested, the crayfish seedlings produced by the crayfish broodstock and the snail seedlings that have not reached the harvest specifications are released into the rice planting area for breeding, thereby greatly improving the breeding efficiency and the utilization rate of the rice fields.

[0021] In the cultivation mode of the present invention, shrimp and snail cultivation and rice planting are staggered in time and space, which does not affect the operation of drying rice fields, applying medicines, etc., and the per-acre yield of rice is guaranteed and easy to manage. Crayfish and snails are in the water storage area in the early stage and in the rice fields after harvest in the later stage, which not only guarantees the growth rate, but also makes full use of biological bait. In particular, the use of hanging cages to raise snails in the water storage area in the early stage is easier to manage than the traditional method of directly putting the seed snails into the rice fields. The produced snail seedlings will not be eaten by crayfish, and it is convenient to harvest the snail seedlings and put them in other rice planting areas. And the fields in the rice planting area can also kill the enemies such as golden apple snails without worry, which will not affect the cultivation of snails. Double-season rice planted in the rice planting area can be irrigated with fertilizer water from the water storage area, without the need to apply nitrogen fertilizer, only potassium fertilizer needs to be applied, and about half of the fertilizer is used less than conventional rice planting. Conventional shrimp and snail rice fields are slow to drain, and shrimps and snails need to be collected, which delays the rice planting time. Therefore, farmers can only plant one crop of rice, and the cultivation mode of the present invention can be used to plant two crops. The present invention fully utilizes the spatial advantage of hilly rice fields, reduces manual operation and rice planting costs, greatly improves breeding benefits and rice field utilization, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The schematic diagram of the overall breeding unit based on the hilly rice field of the present invention; wherein, 1-water storage area; 2-rice planting area, the green filled part represents the planted rice; 3-ridge of the water storage area; 4-diversion channel; 5-the outermost ridge of the rice planting area.

[0023] Figure 2 It is a schematic diagram of a snail breeding hanging cage of the present invention. DETAILED DESCRIPTION

[0024] The present application provides a method for cultivating shrimps and snails in a hilly rice field, comprising the following steps: using a hilly rice field as a breeding unit, and setting a water storage area and a rice planting area in the breeding unit; the water storage area is located in the area with the highest terrain level in the breeding unit, and the terrain level of the rice planting area is lower than that of the water storage area; the water storage area is provided with a diversion channel connected to the rice planting area; during the rice planting period, the snails are cultivated in a cage in the water storage area, and the crayfish seedlings are cultivated with fertilized water; after the rice is harvested, the crayfish seedlings produced by the crayfish seedlings and the snail seedlings that have not reached the harvesting specifications are placed in the rice planting area for cultivation. The rice planting area is set up in 2 to 3 layers with irregular shapes; the area of ​​the rice planting area is determined according to the area of ​​the water storage area, and the area of ​​the rice planting area is 8 to 12 times the area of ​​the water storage area, further 9 to 11 times, and more preferably 10 times. The hilly rice field origin is Guangxi, and more preferably south of Liuzhou, Guangxi.

[0025] In the present invention, the ridges at the bottom of the water storage area are arranged according to the shape of the water storage area, and are generally east-west oriented, with a ridge width of 1.8 to 2.2 m, a height of 35 to 45 cm, and a distance between ridges of 0.8 to 1.2 m; further preferably, the ridge width is 1.9 to 2.1 m, and the height is 37 to 43 cm, more preferably the ridge width is 1.9, 2 or 2.1 m, and the height is 38, 39, 40, 41 or 42 cm; the distance between ridges is 0.9 to 1.1 m, further preferably 0.95 to 1.05 m, and more preferably 1 m. The ridges in the bottom of the water storage area of ​​the above specifications of the present invention can ensure the cultivation of snails in hanging cages, which is conducive to the feeding of snails and ensures the growth of snails.

[0026] In the present invention, the width of the ridge in the water storage area is 0.8-1m, and the depth is 70-90cm; more preferably, the width is 0.85-1m, and the depth is 75-85cm; more preferably, the width is 0.9, 0.95, 1m, and the depth is 80, 81, 82, 83 or 84cm. In the present invention, when the ridges in the rice planting area are arranged, the ridge width is more than 75cm, and the water storage depth is more than 40cm. More preferably, the ridge width is 76cm-90cm, and the water storage depth is 40cm-70cm; more preferably, the width is 77, 78, 79, 80, 81, 82cm, and the water storage depth is 50, 55, 60cm. In the present invention, diversion channels are arranged on the ridges of the water storage area and the rice planting area, so as to ensure that the water in the water storage area can flow to any rice planting area along the diversion channels, so that the water in the water storage area can be used as a nutrient component for rice in the rice planting area, thereby reducing the amount of rice fertilizer used.

[0027] In the present invention, the ridges of the water storage area and the outer periphery of the lowest layer of fields in the rice planting area are all provided with anti-escape nets. The anti-escape nets can be made of galvanized iron sheets or plastic films, buried 10 cm in the soil and exposed 40 cm. In the present invention, the fields in the rice planting area within a height difference of 20 cm are connected and leveled to facilitate soil extraction and water level control.

[0028] In the present invention, the breeding facilities in the water storage area are selected from snail breeding cages. When breeding snails in hanging cages, the density of snail breeding cages is 90 to 110 per mu; more preferably, 95 to 105; more preferably, 100. Compared with the traditional method of directly placing the seed snails into the rice fields, the use of the hanging cages to breed snails in the water storage area in the early stage is easier to manage, and the produced snail seedlings will not be eaten by crayfish, so it is convenient to harvest the snail seedlings and put them in other rice-growing areas. The fields in the rice-growing areas can also kill pests such as golden apple snails without any worries, which will not affect snail breeding.

[0029] In the present invention, when snails are cultured in the hanging cages in the water storage area, the distribution ratio of snail seeds and snail fry in the breeding hanging cages is 3:7. The density of snail seeds is 100 to 120 per cage, and the density of snail fry is 500 to 800 per cage. The snail fry should be selected with neat specifications, complete shells, no injuries or diseases, clean shell surfaces without attachments, and strong abdominal foot contraction; the individual weight of snail fry is greater than 0.5g. The individual weight of snail seeds is greater than 4.0g. There is no need to feed snail bait throughout the snail farming process. The snails rely on filtering plankton in the water to obtain nutrition. As an implementable embodiment, the snail is a pear-shaped ring-edge snail.

[0030] In the present invention, when the crayfish are cultured in the water storage area, the specification of the crayfish seedlings is 4 to 5g per tail; the crayfish are placed at a density of 5,000 to 6,000 tails per mu. Further preferably, the crayfish are placed at a density of 6,000 tails per mu. The crayfish are fed with crayfish feed; the crayfish feed is a commercially available feed with more than 30% protein. The feed is fed once a day, and the daily feeding amount is estimated to be 8% of the total weight of the crayfish. In the present invention, the crayfish variety is Procambarus clarkii.

[0031] In the present invention, the water storage area is used to cultivate crayfish before breeding, and the steps of fertilizing and cultivating seedlings are as follows: soak soybeans for 10 to 14 hours, and the weight ratio of the soaked soybeans to water is 1:8 to 1:12, and the soybeans are beaten into a slurry; filter out the dregs to obtain pure soy milk; sprinkle the soy milk in the water storage area, and the amount used is 3 to 5 jin / mu. Preferably, soak soybeans for 12 hours, and the weight ratio of the soaked soybeans to water is 1:10, and the soybeans are beaten into a slurry; filter out the dregs to obtain pure soy milk; sprinkle the soy milk in the water storage area, and the amount used is 3 jin / mu. It is provided to crayfish fry in the form of suspension in water. In the present invention, the water storage area is used to cultivate crayfish and shrimp, and the water is more fertile and suitable for the growth of snails; snails can eat organic matter in the water, such as rotten aquatic plants, crayfish feces, and leftover feed, which can purify the water quality. The fertilizer water can improve water quality and promote the rapid growth of crayfish. The fertilizer water is rich in nutrients, especially nitrogen fertilizer. It is used to irrigate rice fields without causing rice production reduction. It can also reduce the use of chemical fertilizers and pesticides, reduce rice planting costs, and improve breeding benefits. Snails can also eat plankton in the water, which helps to keep the water quality clean and provide a good growth environment for crayfish.

[0032] In the present invention, after the late rice is harvested in early November, the crayfish seedlings in the water storage area and the snail seedlings that have not reached the harvest specifications are put into the rice planting area for field cultivation. When put in, the specifications of the crayfish seedlings need to be above 4g, and 4800 to 5200 seedlings are put in per mu; further preferably, 5000 seedlings are put in per mu of crayfish seedlings cultivated in the rice planting area fields. The snail seedlings that have not reached the harvest specifications are selected to have a specification of 0.3 to 1g, and the density of release is 14 to 22kg per mu. Preferably, the density of snail seedlings is 15 to 20kg per mu.

[0033] In the present invention, the feed for breeding in the fields in the rice-planting area includes crayfish feed and soybeans. As an implementable method, after the crayfish seedlings produced by crayfish breeders and snail seedlings that have not reached the harvest specifications are placed in the fields in the rice-planting area, the crayfish feed and soybeans are mixed and fed, and the mass ratio is gradually increased from 2:1 to 1:1 during feeding. In the present invention, when the weight of crayfish is less than 10g, the mass ratio of crayfish feed to soybeans is 2:1; when the weight of crayfish is between 10g and 20g, the mass ratio of crayfish feed to soybeans is 1.5:1; when the weight of crayfish reaches more than 20g, the mass ratio of crayfish feed to soybeans is 1:1. In the present invention, the crayfish feed is a commercially available feed, and the protein content can be more than 30%.

[0034] In the present invention, rice varieties with strong disease resistance are selected for planting. Further preferably, the rice variety selected for planting is Wan Tai You.

[0035] In the present invention, the two crops refer to rice being harvested twice a year.

[0036] The water storage area of ​​the present invention adopts the fertilizer water method to carry out mixed cultivation of snails and crayfish fry in hanging cages. Compared with purchasing crayfish fry, it saves time. The fry of fry produced by the fry is cultivated in the water storage area and can be caught to the rice planting area as soon as possible to carry out winter rice idle field cultivation, which is more efficient.

[0037] The present invention is mainly aimed at hilly rice fields, and the highest land mass is selected to set up a water storage area. During the rice planting period, snails are cultured in hanging cages in the water storage area, and crayfish are cultured by fertilizing water. During the rice planting period, two crops of rice are normally planted in the rice planting area, and snails and crayfish are cultured in the water storage area. In the winter idle season after the rice harvest, the crayfish seedlings and snail seedlings that have not reached the harvest specifications in the water storage area are put into other rice planting area plots for breeding, which greatly improves the breeding efficiency and rice field utilization rate.

[0038] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods; the materials and reagents used are reagents and materials that can be obtained from commercial channels unless otherwise specified.

[0039] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0040] Example 1

[0041] South of Liuzhou, Guangxi, we selected hilly rice fields with sufficient water resources and good water retention and divided them into several breeding units.

[0042] 1. Selection, setting and transformation of breeding sites:

[0043] Each breeding unit includes a water storage area and a rice planting area (such as Figure 1 The area with the highest terrain level in the breeding unit is used as the water storage area, and the area with lower terrain level is used as the rice planting area. The area of ​​the rice planting area is determined according to the area of ​​the water storage area, and the area of ​​the rice planting area is 10 times the area of ​​the water storage area.

[0044] The water storage area is used for caged snail farming and crayfish seedlings. It is located at the highest point and no rice is planted. The bottom of the water storage area is divided into ridges, which are set according to the shape of the water storage area. The overall orientation is east-west, with a width of 2 meters and a height of 40 cm. The distance between ridges is 1 meter. The ridges in the water storage area are raised and reinforced, with a width of 1 meter and a depth of 80 cm.

[0045] In the rice-growing area, shrimps are raised in winter, and rice is grown normally during normal seasons (from early April to the end of October). The rice-growing area has 2 to 3 layers of irregularly shaped fields divided by ridges. The ridges in the rice-growing area are arranged according to the winter idle field flat farming mode. The ridges are set to be 80 cm wide and the water storage depth can reach 60 cm. The rice-growing area fields with a height difference of less than 20 cm are connected and leveled to facilitate soil extraction and water level control.

[0046] Diversion channels are set up on the ridges of the water storage area and the rice-growing area to ensure that the water in the water storage area can flow along the diversion channels to any rice-growing area by utilizing the height difference.

[0047] Anti-escape nets are set up on the ridges of the water storage area and the outer ridges of the lowest rice planting area. The anti-escape nets can be made of galvanized iron sheets or plastic films, buried 10 cm in the soil and exposed 40 cm.

[0048] 2. Aquaculture in water storage areas

[0049] During the rice planting period, rice is not planted in the reservoir area. Instead, the fertilization method is used to culture crayfish broodstock and snails are cultured in hanging cages in the reservoir area.

[0050] 1. Cage-caged snails

[0051] Snail breeding facility setting: The water storage area breeding facility chooses snail breeding hanging cage ( Figure 2), the snail breeding hanging cage is hung in the deep water area between the ridges in the water storage area. The snail breeding hanging cage is fixed symmetrically on the top of the plastic basket with a float, 4 to 6 floats, and the basket is connected in series by ropes. The snail breeding cage consists of floats, hanging ropes, plastic baskets and other parts, and toxic and harmful materials must not be used. The float is made of polyethylene, with a diameter of about 15cm and a middle hole diameter of about 1.5cm. The hanging rope is made of polyethylene, with a diameter of about 0.5cm or more. The plastic basket should be made of high-density polyethylene, with a diameter of 60cm and a height of 100cm. The basket surface has mesh holes with a hole diameter of about 0.3cm, a volume of 0.3 to 0.4 cubic meters, and a mesh cover.

[0052] The snail breeding cages are placed from March to April, with a density of 100 per mu.

[0053] Snail farming: The snail species selected is the pear-shaped ring-edge snail, and the source is selected from wild fishing or artificial breeding. On April 10, snails were released. Snail breeding cages were filled with both snail seeds and snail fry. The distribution ratio of snail seeds and snail fry in the breeding cages was 3:7. The density of snail seeds was 100-120 per cage, and the density of snail fry was 500-800 per cage. Snail fry should be selected with uniform specifications, complete shells, no injuries or diseases, clean shells without attachments, and strong abdominal foot contraction. The individual weight of snail fry is greater than 0.5g. The individual weight of snail seeds is greater than 4.0g. There is no need to feed snail bait during the whole process of snail farming. Snails rely on filtering plankton in the water to obtain nutrition. Snail fry can be harvested once a month from the time they are released to September, and 6 to 7 batches can be harvested a year. Commercial snails (i.e., soup snails) can be harvested once 3 to 4 months after the snail fry are cultured. The size is larger than 2g, and 2 to 3 batches can be produced a year.

[0054] 2. Crawfish breeding with fertilizing water

[0055] The crayfish were selected from the freshwater crayfish of Guangxi - Procambarus clarkii. In April every year, when the seed price is the lowest, large-sized crayfish seed weighing 4 to 5 grams per tail are released in the reservoir area, and the number of crayfish seed is 6,000 per mu. The crayfish are fed with crayfish feed, which is a commercially available feed with more than 30% protein. The feed is fed once a day, and the daily feeding amount is estimated to be 8% of the total weight of the crayfish.

[0056] Generally, the shrimps are cultivated until the beginning of July and then sold. Enough shrimps are left. Around September 20, check that more than 60% of the shrimp gonads have developed to the third stage. Then the water can be drained and the field can be dried for 1 week. When draining, pay attention to draining quickly first and then slowly, leaving enough time for the shrimps to dig holes. The water will be returned on September 30. One week later, fertilize and cultivate seedlings, and gradually deepen the water to 60cm. Fertilize and cultivate seedlings: Soak soybeans for 12 hours, and use a pulping machine to make a pulp according to the weight ratio of soybeans to water of 1:10. Filter out the dregs to get pure soy milk. Sprinkle the soy milk evenly in the water, using 3 jin / mu, and suspend it in the water to feed the crayfish seedlings. The dregs can be mixed in the crayfish feed and fed.

[0057] 3. Winter rice farming in idle fields in rice-growing areas

[0058] Double-season rice is planted in the rice-growing areas from early April to the end of October, and the rice variety is Wan Taiyou.

[0059] After harvesting late rice in early November, regularly check the crayfish seedlings produced by crayfish seedlings in the water storage area. When the size of the crayfish seedlings reaches more than 4g, use ground cages to catch them and release them to the rice planting area, at a rate of 5,000 per mu. After being released into the fields in the rice planting area, mix and feed crayfish feed and soybeans, and gradually increase the mass ratio from 2:1 to 1:1 during feeding. The crayfish feed is a commercially available feed with more than 30% protein. Specifically, when the crayfish weighs less than 10g, the mass ratio of crayfish feed to soybeans is 2:1; when the crayfish weighs between 10g and 20g, the mass ratio of crayfish feed to soybeans is 1.5:1; when the crayfish weighs more than 20g, the mass ratio of crayfish feed to soybeans is 1:1.

[0060] At the same time, snail seedlings with a size of 0.3 to 1g raised in the deep water area of ​​the reservoir are released into the rice-growing fields at a density of 15kg to 20kg per mu.

[0061] By late December, all crayfish fry still weighing less than 4 grams will be freely discharged into the rice-growing fields along the diversion canal.

[0062] All adult shrimps and snails will be sold before the end of March of the following year. Ducks will be driven into the fields to remove the unharvested crayfish and snails. After the fields are dried, the planting of early rice for the next year will begin.

[0063] As of the end of March, the entire breeding unit had an average harvest of 480 kg of snails per mu, 100 to 120 kg of crayfish per mu, and about 600 kg of rice per mu from two crops.

[0064] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for cultivating shrimps and snails in hilly rice fields, characterized in that: The following steps are involved: A hilly rice field is used as a breeding unit, and a water storage area and a rice planting area are set in the breeding unit; the water storage area is located in the area with the highest terrain level in the breeding unit, and the terrain level of the rice planting area is lower than that of the water storage area; a diversion channel is set in the water storage area to communicate with the rice planting area; During the rice planting period, snails are cultured in hanging cages in the water storage area, and crayfish brood are cultured in fertilized water; After the rice is harvested, the crayfish seedlings produced by the crayfish breeders and the snail seedlings that have not reached the harvest specifications are released into the rice planting area for breeding.

2. The method according to claim 1, characterized in that: The area of ​​the rice planting area is 8 to 12 times the area of ​​the water storage area.

3. The method according to claim 1, characterized in that: The ridges at the bottom of the water storage area are arranged according to the shape of the water storage area, and are generally east-west oriented, with a ridge width of 1.8 to 2.2 m and a height of 35 to 45 cm; the distance between ridges is 0.8 to 1.2 m; the ridges of the water storage area are 0.8 to 1 m wide and 70 to 90 cm deep.

4. The method according to claim 1, characterized in that: The width of the ridge in the rice planting area is more than 80 cm, and the water storage depth is more than 40 cm.

5. The method according to any one of claims 1 to 4, characterized in that: When the snails are cultured in hanging cages in the water storage area, the density of the hanging cages is 90 to 110 per mu.

6. The method according to claim 5, characterized in that: When the snail seedlings are released into the hanging cages in the water storage area, the release density is 500 to 800 snail seedlings per cage, and the snail seedling specifications are that the individual weight is greater than 0.5g. When the snail seeds are released into the hanging cages in the water storage area, the snail seeds release density is 100 to 120 snail seeds per cage.

7. The method according to any one of claims 1 to 4, characterized in that: When breeding crayfish broodstock in the water storage area, the specification of the crayfish broodstock is 4-5g per tail, and the stocking density is 5000-6000 tails per mu.

8. The method according to any one of claims 1 to 4, characterized in that: The crayfish seedlings produced by crayfish broodstock and snail seedlings that have not reached the harvest specifications are placed in the rice planting area for breeding and then fertilized and watered to cultivate the seedlings; the fertilization and watered to cultivate the seedlings step includes: pouring soy milk into the water in the water storage area, with an amount of 3 to 5 jin per mu.

9. The method according to claim 8, characterized in that: The specifications of the crayfish seedlings are above 4g, and 4800 to 5200 seedlings are released per mu; the snail seedlings that have not reached the harvest specifications are 0.3 to 1g, and the release density is 15 to 20kg per mu.

10. The method according to claim 1, characterized in that: The rice planting area is arranged in 2 to 3 layers, and two seasons of rice are planted in the rice planting area from early April to the end of October.

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