Homocentric-square-shaped procambarus clarkii culture pond and method

Abstract

The invention discloses a rectangular-ambulatory-plane procambarus clarkii culture pond and method. The pond comprises a pond body, a culture area arranged in the pond body, a surrounding ridge arranged on the periphery of the culture area, a surrounding net arranged on the inner periphery of the surrounding ridge, a rectangular-ambulatory-plane groove arranged on the periphery of the surrounding ridge and an anti-escape net arranged on the periphery of the rectangular-ambulatory-plane groove. The method is realized on the basis of the culture pond for the procambarus clarkii shaped like the Chinese character'hui 'and comprises the following steps: transforming the pond; the eel grass, the hydrilla varticillata and the elodea nuttallii are planted in a mixed and alternate manner in the culture Managing vallisneria natans, hydrilla varticillata and elodea nuttallii in the culture area; planting water hyacinth and alternanthera philoxeroides in the concentric-square Breeding the procambarus clarkii in the breeding area all year round; breeding of procambarus clarkii seeds in the shape of the Chinese character hui; catching the procambarus clarkii fry in the clip-shaped groove; fishing in winter; managing water quality; wild trash fish is removed. The method has the advantages that the pond can be fully utilized, two more crayfishes are bred, the yield per mu of the crayfishes bred in the pond is greatly increased, and higher economic value is created; and the labor intensity is reduced, and labor employment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of Procambarus clarkii, and specifically relates to a meandering Procambarus clarkii aquaculture pond and method. Background Art

[0002] Procambarus clarkii, also known as crayfish or Louisiana crayfish, is native to northeastern Mexico and southern United States. Its meat is plump, tender, rich in nutrition, and can be cooked in various ways, making it a delicious dish deeply loved by domestic consumers. This shrimp was introduced from the United States to Japan in 1918, and then from Japan to Nanjing, China in 1929, and quickly spread to most provinces in China. Now it is distributed in Jiangsu, Jiangxi, Hubei, Shanghai, Henan, Fujian and other places. The common artificial aquaculture methods are rice-crayfish farming and pond aquaculture. However, the existing pond aquaculture technology for Procambarus clarkii usually has the following problems:

[0003] First, a large amount of Elodea nuttallii (a kind of aquatic plant) needs to be planted in early March every year, and Hydrilla verticillata needs to be planted by releasing water in early June. During the planting period, a large amount of labor and money are needed to purchase aquatic plants, that is, the cost of planting aquatic plants is high and the labor intensity is large.

[0004] Second, the Elodea nuttallii planted in spring grows slowly and does not reach a certain abundance of aquatic plants until April. Only then can Procambarus clarkii fry be stocked to breed the first season of Procambarus clarkii, and the stocking time of fry is relatively late.

[0005] Third, Procambarus clarkii fry need to be purchased externally. Whether there are some broodstock in the pond or the pond has been cleared, some fry need to be purchased externally to reach the aquaculture density of 6,000 tails per mu. The externally purchased fry will also have problems of uncontrollable quality and high mortality.

[0006] Fourth, for the first season of Procambarus clarkii cultured in the pond, due to the late stocking time of fry, it can only reach the commercial specification one after another in May. The listing time is late, overlapping with the time when a large number of rice-crayfish are on the market, and it is difficult to obtain good economic benefits.

[0007] Fifth, in the existing pond, only two seasons of Procambarus clarkii can be cultured from April to August, and the rest of the time the pond is in a dry state, without realizing the reasonable use of the pond. Summary of the Invention

[0008] The purpose of the present invention is to provide a meandering Procambarus clarkii aquaculture pond and method to solve the problems existing in the existing pond aquaculture technology for Procambarus clarkii in the background art.

[0009] To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0010] On the one hand, the present invention provides a circular crayfish breeding pond, comprising a pond body and a breeding area arranged inside the pond body, the breeding area is provided with a ridge on the periphery, the inner periphery of the ridge is provided with a fence, the periphery of the ridge is provided with a circular ditch, and the periphery of the circular ditch is provided with an escape-proof net.

[0011] Furthermore, the cross-sectional shape of the surrounding ridge is a trapezoidal structure that is narrow at the top and wide at the bottom, and the cross-sectional shape of the return ditch is a trapezoidal structure that is wide at the top and narrow at the bottom.

[0012] Furthermore, escape prevention facilities are arranged around the periphery of the escape prevention net and along the bank of the pond.

[0013] Furthermore, a water inlet is provided upstream of the pond body, and the water inlet is connected to an external water source with the return ditch and the breeding area through an inlet pipe; wherein the inlet pipe has a water inlet and two water outlets, the water inlet of the inlet pipe is connected to the external water source, and one of the two water outlets of the inlet pipe faces the breeding area, and the other faces the return ditch.

[0014] Furthermore, a breeding area drain outlet and a return ditch drain outlet are provided downstream of the pond body. The breeding area drain outlet is connected to the breeding area through a breeding area drain pipe, and the return ditch drain outlet is connected to the return ditch through a return ditch drain pipe.

[0015] Furthermore, a filtering facility is installed at the water inlet of the water inlet pipe to prevent wild fish or harmful organisms from entering.

[0016] Furthermore, the outlets of the drainage pipes in the breeding area and the drainage pipes in the return ditch are installed with filtering and escape prevention facilities to prevent escape and entry of wild fish or harmful organisms.

[0017] On the other hand, the present invention provides a method for cultivating Procambarus clarkii based on the above-mentioned Procambarus clarkii cultivation pond, comprising the following steps:

[0018] S1. Pond reconstruction: First, dig a circular ditch along the bottom of the pond slope at 30% of the pond area, then roll and tamp the soil excavated from the circular ditch in layers around the aquaculture area next to the circular ditch to build a ridge, so that the aquaculture area can store 0.5m of water without exceeding the ridge, and the circular ditch can store 1.3m of water without exceeding the ridge. Then, fix the fence around the side of the ridge close to the aquaculture area, and fix the anti-escape net around the side of the pond ridge close to the circular ditch. Finally, install the water inlet pipe and the drainage pipe in the aquaculture area and the circular ditch respectively;

[0019] S2. Mixed rotation planting of Vallisneria natans, Hydrilla verticillata and Elodea nuttallii in the aquaculture area: After the pond renovation is completed, in March of the first year, plant the four-season dwarf Vallisneria natans in the aquaculture area with a planting area of 40%; in June of the first year, plant Hydrilla verticillata in the aquaculture area with a planting area of 10%; in October of the first year, plant Elodea nuttallii in the aquaculture area with a planting area of 10%.

[0020] S3. Management of Vallisneria natans, Hydrilla verticillata and Elodea nuttallii in the aquaculture area: After planting Vallisneria natans in March of the first year, there is no need for subsequent replanting, and only the spreading area of Vallisneria natans needs to be controlled within 60%; after planting Hydrilla verticillata in June of the first year, depending on the budding and growth of Hydrilla verticillata in May of the following year, appropriate replanting or no replanting is carried out in June of the following year; after planting Elodea nuttallii in October of the first year, depending on the labor situation, appropriate replanting or no replanting is carried out in October of the following year.

[0021] S4. Planting of Eichhornia crassipes and Paspalum thunbergii in the return ditch: After the pond renovation is completed, only in June of the first year, put Eichhornia crassipes on 30% of the water surface area of the return ditch and block it with floating baffles to prevent it from spreading to the whole pond; after the pond renovation is completed, only in March of the first year, sow and plant Paspalum thunbergii on the slope near the pond bank on one side of the return ditch.

[0022] S5. Annual culture of Procambarus clarkii in the aquaculture area: In the first ten days of March every year, put 50 catties of Procambarus clarkii fry per mu of the aquaculture area, with 100 to 120 tails per catty, and put the Procambarus clarkii fry into the aquaculture area. After putting the fry, start feeding the feed. The feed feeding amount should be appropriate for the Procambarus clarkii to finish eating within 4 hours after feeding, and the daily feeding amount accounts for 8 - 10% of the total weight of the shrimps in the whole pond until mid-April, ending the first-season culture of Procambarus clarkii; in the last ten days of April every year, put 60 catties of Procambarus clarkii fry per mu of the aquaculture area, with 120 to 150 tails per catty, and put the Procambarus clarkii fry into the aquaculture area. After putting the fry, start feeding the feed. The daily feed feeding amount accounts for 2 - 3% of the total weight of the shrimps in the whole pond to control the growth of Procambarus clarkii until early July, ending the second-season high-temperature culture of Procambarus clarkii; in the middle of July every year, put 60 catties of Procambarus clarkii fry per mu of the aquaculture area, with 100 to 120 tails per catty, and put the Procambarus clarkii fry into the aquaculture area. After putting the fry, start feeding the feed. The daily feed feeding amount accounts for 8 - 10% of the total weight of the shrimps in the whole pond until late August, ending the third-season high-temperature culture of Procambarus clarkii; in the first ten days of September every year, put 60 catties of Procambarus clarkii fry per mu of the aquaculture area, with 100 to 120 tails per catty, and put the Procambarus clarkii fry into the aquaculture area. After putting the fry, start feeding the feed. The daily feed feeding amount accounts for 5 - 8% of the total weight of the shrimps in the whole pond until before February of the following year, and all the adult shrimps in the aquaculture area are caught and sold, ending the fourth-season winter culture of Procambarus clarkii.

[0023] S6. Breeding of Procambarus clarkii seedlings in the ditch: In mid-April every year, the first batch of seed shrimps is released. That is, while the commercial shrimps are being caught and sold in the breeding area, high-quality Procambarus clarkii with large size, symmetrical body shape and sufficient vitality are selected and released into the ditch at a rate of 60 female shrimps / mu and 20 male shrimps / mu. The water level of the ditch is slowly lowered to 5cm within two weeks to force them to dig holes for mating, laying eggs and hatching. In early July every year, the operation of releasing seed shrimps for the first time is repeated and the second batch of seed shrimps is released.

[0024] S7. Fishing of Procambarus clarkii seedlings in the ditch: Around March and September each year, use dense mesh cages to fish out shrimp seedlings from the ditch and transfer them to the culture area for breeding. If the number of shrimp seedlings is small, purchase some shrimp seedlings and increase the amount of seed shrimps released; if the number of shrimp seedlings is large, sell the shrimp seedlings and reduce the amount of seed shrimps released; in the rest of the months except March and September each year, the shrimp seedlings produced in the ditch can be used as a supplement and released to the culture area for breeding of finished shrimps;

[0025] S8. Winter Crayfish Fishing: Winter Crayfish Fishing is carried out by lowering the water level to 0.4m and extending the time for catching ground traps;

[0026] S9. Water quality management: During the breeding process, if the water plants are dirty, use organic acid and Bacillus to treat them at noon on a sunny day; if the water plants have ciliates, use zinc sulfate heptahydrate to treat them; during the breeding period, regularly add minerals to maintain the hardness index of the pond water at 260mg / L;

[0027] S10. Removal of wild fish from the pond: In early March each year, before the first stocking of seedlings, use tea meal to spray the entire pond for the first removal of weeds; in early September each year, before the fourth stocking of seedlings, use rotenone to spray the entire pond for the second removal of weeds.

[0028] Furthermore, the slope ratio of the pond slope is 1:2.5.

[0029] Furthermore, the fence is composed of a number of polyethylene meshes, adjacent polyethylene meshes are connected and fixed by galvanized steel strands, the height of the fence is 1.5m, and double-sided plastic films with anti-escape structures are sewn on both sides of the fence; the anti-escape net is composed of polyethylene meshes with plastic films attached or anti-escape plastic films.

[0030] Compared with the prior art, the advantages of the present invention are as follows:

[0031] (1) The pond culture method of the Procambarus clarkii provided by the present invention can make full use of the pond and culture two more batches of crayfish, greatly improving the per-acre yield of pond cultured crayfish and creating higher economic value;

[0032] (2) The pond culture method of Procambarus clarkii provided by the present invention significantly reduces the labor intensity and reduces the labor employment; specifically, in early March and early June, the large-scale planting of Elodea nuttallii and Hydrilla verticillata in the pond by draining water is omitted.

[0033] (3) The pond culture method of Procambarus clarkii provided by the present invention can provide the Procambarus clarkii fry in the original pond around March and September, omitting part of the cost of purchasing fry and greatly improving the survival rate of fry release.

[0034] (4) The pond culture method of Procambarus clarkii provided by the present invention can realize controllable breeding density in the breeding area. Through the setting of the enclosure net, the problem of integrated breeding and high and uncontrollable breeding density caused by original pond breeding and original pond breeding is solved, and large-sized high-quality shrimp can be cultured.

[0035] (5) The pond culture method of Procambarus clarkii provided by the present invention can culture one season of early shrimp and one season of winter shrimp. There are shrimps for sale during the periods when the price of Procambarus clarkii is the most expensive in a year, realizing off-peak listing and greatly improving the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0037] Figure 1 It is a top view of the Procambarus clarkii culture pond provided by the embodiment of the present invention;

[0038] Figure 2 It is a cross-sectional view of the Procambarus clarkii culture pond provided by the embodiment of the present invention;

[0039] Description of the reference numerals: 1. Pond body; 2. Breeding area; 3. Enclosure dike; 4. Enclosure net; 5. Loop-shaped ditch; 6. Anti-escape net; 7. Water inlet pipe; 8. Drain pipe of the breeding area; 9. Drain pipe of the loop-shaped ditch; 10. Working channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0042] The present invention will be further described below in conjunction with the accompanying drawings:

[0043] Embodiment 1: As Figure 1 and Figure 2 shown, the embodiment of the present invention provides a meandering Procambarus clarkii breeding pond, which includes a pond body 1 and a breeding area 2 arranged inside the pond body 1. A dike 3 is arranged on the periphery of the breeding area 2, a surrounding net 4 is arranged inside the dike 3, a meandering ditch 5 is arranged on the periphery of the dike 3, and an escape-proof net 6 is arranged on the periphery of the meandering ditch 5.

[0044] Specifically, in this embodiment, the cross-sectional shape of the dike 3 is a trapezoidal structure that is narrow at the top and wide at the bottom, and the cross-sectional shape of the meandering ditch 5 is a trapezoidal structure that is wide at the top and narrow at the bottom.

[0045] Specifically, in this embodiment, in order to prevent Procambarus clarkii from escaping, an escape-proof facility is arranged around the periphery of the escape-proof net 6 and along the perimeter of the pond embankment surface, and the escape-proof facility adopts a known existing design.

[0046] Specifically, in this embodiment, in order to supply water to the meandering ditch 5 and the breeding area 2, a water inlet is arranged at the upstream of the pond body 1, and the water inlet is connected to the external water source, the meandering ditch 5 and the breeding area 2 through a water inlet pipe 7; among them, the water inlet pipe 7 has one water inlet and two water outlets. The water inlet of the water inlet pipe 7 is connected to the external water source. One of the two water outlets of the water inlet pipe 7 faces the breeding area 2, and the other faces the meandering ditch 5. More specifically, the water inlet pipe 7 is composed of a PVC pipe with a diameter of 200 mm and is connected with a water pump. During use, the water flow rate can be adjusted through the water pump according to the breeding requirements. In addition, in order to enable the water outlet of the water inlet pipe 7 facing the breeding area 2 to flow smoothly into the breeding area 2, the water inlet pipe 7 needs to be erected so that the water outlet facing the breeding area 2 crosses the meandering ditch 5 and extends above the breeding area 2. More specifically, the water inlet pipe 7 is erected above the pond body 1.

[0047] Specifically, in this embodiment, in order to drain the water in the meandering ditch 5 and the breeding area 2, a breeding area drain outlet and a meandering ditch drain outlet are arranged at the downstream of the pond body 1. Among them, the breeding area drain outlet is connected to the breeding area 2 through a breeding area drain pipe 8, and the meandering ditch drain outlet is connected to the meandering ditch 5 through a meandering ditch drain pipe 9. More specifically, the breeding area drain pipe 8 and the meandering ditch drain pipe 9 are buried inside the pond body 1.

[0048] Specifically, in this embodiment, in order to prevent wild fish or harmful organisms from entering the pond body 1, a filtering facility is installed at the water inlet of the water inlet pipe 7. More specifically, the filtering facility is preferably a polyethylene mesh bag with a mesh size of 80 or more, covering the water inlet of the water inlet pipe 7.

[0049] Specifically, in this embodiment, in order to prevent crayfish from escaping from the drainage outlet and wild fish or harmful organisms from entering from the drainage outlet, a filtering and escape prevention facility is installed at the outlet of the breeding area drainage pipe 8 and the return ditch drainage pipe 9. More specifically, the filtering and escape prevention facility is preferably composed of a 20-mesh polyethylene mesh.

[0050] Specifically, in this embodiment, in order to facilitate the entry of the staff, a working passage 10 is provided at a corner of the pond body 1 close to the road, and the anti-escape net 6 and the fence 4 located at the working passage 10 are detachable.

[0051] Embodiment 2: The embodiment of the present invention also provides a method for cultivating Procambarus clarkii based on the above-mentioned Procambarus clarkii cultivation pond, which comprises the following steps:

[0052] S1. Pond reconstruction: First, excavate a return ditch 5 downward along the bottom of the pond slope according to 30% of the pond area, then roll and tamp the soil excavated from the construction of the return ditch 5 in layers around the breeding area 2 immediately following the return ditch 5, and build a ridge 3 so that the breeding area 2 can store 0.5m of water without exceeding the ridge 3, and the return ditch 5 can store 1.3m of water without exceeding the ridge 3. Then, fix the fence 4 around the side of the ridge 3 close to the breeding area 2, and fix the anti-escape net 6 around the side of the pond ridge close to the return ditch 5. Finally, install the water inlet pipe and the drainage pipe in the breeding area 2 and the return ditch 5 respectively;

[0053] S2. Mixed rotation planting of Vallisneria, Hydrilla verticillata and Elodea in the aquaculture area: After the pond transformation is completed, Vallisneria sempervirens will be planted in the aquaculture area in March of the first year, with a planting area of ​​40%; Hydrilla verticillata will be planted in the aquaculture area in June of the first year, with a planting area of ​​10%; Elodea will be planted in the aquaculture area in October of the first year, with a planting area of ​​10%;

[0054] S3. Management of Vallisneria, Hydrilla verticillata and Elodea in the aquaculture area: After Vallisneria is planted in March of the first year, there is no need to replant it later. It is only necessary to control the spread area of ​​Vallisneria within 60%; after Hydrilla verticillata is planted in June of the first year, appropriate replanting or no replanting may be carried out in May of the following year depending on the budding and growth of Hydrilla verticillata; after Elodea is planted in October of the first year, appropriate replanting or no replanting may be carried out in October of the following year depending on the labor situation;

[0055] S4. Planting Eichhornia crassipes and Paspalum thunbergii in the meandering channels: After the pond renovation is completed, only in June of the first year, release Eichhornia crassipes on 30% of the water surface area of the meandering channels and block it with floating baffles to prevent it from spreading to the whole pond; after the pond renovation is completed, only in March of the first year, sow and plant Paspalum thunbergii on the slope near the pond bank on one side of the meandering channels.

[0056] S5. Year-round cultivation of Procambarus clarkii in the cultivation area: In the first ten days of March every year, release 50 catties of Procambarus clarkii fry per mu of the cultivation area, with 100 to 120 tails per catty, and put the Procambarus clarkii fry into the cultivation area. After releasing the fry, start feeding the feed. The amount of feed fed should be appropriate for the Procambarus clarkii to finish eating within 4 hours after feeding, and the daily feeding amount accounts for 8-10% of the total weight of the shrimps in the whole pond until mid-April, when the first season of Procambarus clarkii cultivation ends; in the last ten days of April every year, release 60 catties of Procambarus clarkii fry per mu of the cultivation area, with 120 to 150 tails per catty, and put the Procambarus clarkii fry into the cultivation area. After releasing the fry, start feeding the feed. The daily feeding amount of the feed accounts for 2-3% of the total weight of the shrimps in the whole pond to control the growth of Procambarus clarkii until the first ten days of July, when the second season of high-temperature Procambarus clarkii cultivation ends; in the middle of July every year, release 60 catties of Procambarus clarkii fry per mu of the cultivation area, with 100 to 120 tails per catty, and put the Procambarus clarkii fry into the cultivation area. After releasing the fry, start feeding the feed. The daily feeding amount of the feed accounts for 8-10% of the total weight of the shrimps in the whole pond until the last ten days of August, when the third season of high-temperature Procambarus clarkii cultivation ends; in the first ten days of September every year, release 60 catties of Procambarus clarkii fry per mu of the cultivation area, with 100 to 120 tails per catty, and put the Procambarus clarkii fry into the cultivation area. After releasing the fry, start feeding the feed. The daily feeding amount of the feed accounts for 5-8% of the total weight of the shrimps in the whole pond until all the adult shrimps in the cultivation area are caught and sold before February of the following year, when the fourth season of winter Procambarus clarkii cultivation ends.

[0057] S6. Seed breeding of Procambarus clarkii in the meandering channels: In the middle of April every year, conduct the first release of broodstock, that is, while the commercial shrimps in the cultivation area are caught and sold, select high-quality Procambarus clarkii with large specifications, well-proportioned body shapes and sufficient vitality, and release them into the meandering channels at a rate of 60 female shrimps / mu and 20 male shrimps / mu, and slowly lower the water level of the meandering channels to 5 cm within two weeks to force them to dig holes, mate, lay eggs and hatch; in the first ten days of July every year, repeat the operation of the first release of broodstock and conduct the second release of broodstock; among them, the first release of broodstock is to cultivate the shrimp fry in September of the current year, and the second release of broodstock is to cultivate the early fry in March of the following year. It should be noted that the number of broodstock released should be judged whether to increase or decrease according to the density of the shrimp fry in the meandering channels.

[0058] S7. Procurement of Procambarus clarkii fry in the meandering ditch: Around March and September of each year, use a dense net and ground cage to catch the fry in the meandering ditch, and transfer the fry to the breeding area for breeding. If the number of fry is small, purchase some fry externally and increase the amount of broodstock released at the same time; if the number of fry is large, sell the fry and reduce the amount of broodstock released at the same time. In the remaining months of each year except March and September, the fry produced in the meandering ditch can be used as a supplement and caught and released into the breeding area to breed finished shrimps;

[0059] S8. Procurement of Procambarus clarkii in winter: Lower the water level to 0.4m and extend the time of lifting the ground cage to carry out the procurement of Procambarus clarkii in winter. Since the temperature is relatively low in winter and the activity of Procambarus clarkii is low, it is difficult to catch. By lowering the water level to 0.4m and extending the time of lifting the ground cage, the capture rate of Procambarus clarkii in winter can be effectively improved;

[0060] S9. Water quality management: During the breeding process, if the aquatic plants are dirty, use organic acids and bacillus at noon on sunny days for treatment; if there are ciliates on the aquatic plants, use zinc sulfate heptahydrate for treatment. During the breeding period, regularly supplement minerals (such as calcium, magnesium, etc.) to maintain the hardness index in the pond water at 260mg / L;

[0061] S10. Removal of wild fish in the pond: In early March of each year, before the first fry release, use tea seed cake to sprinkle the whole pond for the first impurity removal; in early September of each year, before the fourth fry release, use rotenone to sprinkle the whole pond for the second impurity removal.

[0062] Specifically, in step S1, the slope ratio of the pond slope is 1:2.5; the depth of the meandering ditch 5 dug out is 0.8m, the upper width of the ditch is 5m, and the lower width of the ditch is 2m.

[0063] Specifically, in step S1, the dike 3 is formed by layering and compacting the soil dug from the original pond to form the meandering ditch 5, with a top width of 0.5m, a bottom width of 0.8m, and a height of 0.5m.

[0064] It should be noted that the depth of the meandering ditch 5 and the height of the dike 3 are measured with reference to the reference plane of the breeding area.

[0065] Specifically, in step S1, the enclosure net 4 is composed of several polyethylene mesh sheets, and adjacent polyethylene mesh sheets are fixed by threading galvanized steel strands. The height of the enclosure net 4 is 1.5m, and plastic films with a double-sided anti-escape structure are sewn on both sides of the enclosure net 4.

[0066] Specifically, in step S1, the anti-escape net 6 is composed of a polyethylene mesh sheet with a plastic film attached or an anti-escape plastic film; when installing the anti-escape net 6, the anti-escape net 6 is buried 20cm underground and 40cm above the ground.

[0067] Specifically, in step S1, the method for installing and fixing the surrounding net 3 is as follows: First, dig a trench with a depth of 0.2 m along the bottom of the embankment 3 on the side close to the aquaculture area 2. Then bury the bottom end of 0.2 cm of the surrounding net 4 into the trench and backfill and compact it. Next, set a vertical support member every 3 m along the surrounding net 4 (using a galvanized steel pipe with a diameter of 3 cm, a total height of 1.8 m, and a buried depth of 0.5 m underground). Subsequently, fix the upper edge of the surrounding net 4 to the top of the vertical support member with galvanized steel strands, and set a galvanized steel wire diagonal bracing and reinforcement device at the corners. Here, the installation and fixation of the surrounding net 3 can be completed.

[0068] Specifically, in step S2, except that the dwarf Vallisneria natans is a perennial stemless submerged herb and only needs to be planted once in March of the first year, Hydrilla verticillata and Elodea nuttallii need to be replanted or not according to the labor situation in the following years; because Hydrilla verticillata will die successively in October after being planted in June every year, and Elodea nuttallii will die successively in June of the following year after being planted in October every year, therefore, Hydrilla verticillata and Elodea nuttallii need to be replanted or not according to the labor situation. It should be noted that after many years, when the coverage area of the Vallisneria natans in the aquaculture area reaches 60%, there is no need to plant Hydrilla verticillata and Elodea nuttallii anymore, but the waterweed coverage area in the aquaculture area needs to be controlled within 60%.

[0069] Specifically, in step S3, after planting Hydrilla verticillata in June of the first year, Hydrilla verticillata will die successively in October. After the death of Hydrilla verticillata, spores will be formed and germinate and grow in May of the following year. At this time, according to the germination and growth situation, Hydrilla verticillata can be appropriately replanted in June of the following year, or Hydrilla verticillata can also not be replanted.

[0070] Specifically, in step S3, after Elodea nuttallii is planted in October of the first year, it will die with the increase of temperature in June of the following year. At this time, according to the labor situation, Elodea nuttallii can be appropriately replanted in October of the following year, or Elodea nuttallii can also not be replanted.

[0071] The Procambarus clarkii aquaculture method based on the above-mentioned Procambarus clarkii aquaculture pond provided by the embodiment of the present invention has the following advantages compared with the existing pond shrimp farming mode:

[0072] (1) It can make full use of the pond, raise two more crops of crayfish, greatly improve the per-mu yield of crayfish in pond aquaculture, and create higher economic value;

[0073] (2) It significantly reduces the labor intensity and reduces the labor employment; specifically, it saves the large-area planting of Elodea nuttallii and Hydrilla verticillata by draining the pond water in early March and early June;

[0074] (3) It can provide Procambarus clarkii fry in the original pond around March and September, saving part of the cost of purchasing fry and greatly improving the survival rate of fry release;

[0075] (4) It can achieve controllable breeding density in the breeding area. By setting up enclosures, it solves the problem of integrated breeding and reproduction in the original pond, which leads to an uncontrollable and excessively high breeding density, and can breed large-sized high-quality shrimp.

[0076] (5) It can breed early-season shrimp and winter-season shrimp. There are shrimp available for sale during the periods when the price of Procambarus clarkii is the highest in a year, achieving off-peak listing and greatly improving economic benefits.

[0077] Finally, it should be noted that the above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A pond for culturing Procambarus clarkii in a zigzag shape, comprising a pond body (1) and a culturing area (2) arranged inside the pond body (1), characterized in that: The breeding area (2) is provided with a ridge (3) on the periphery, a fence (4) is provided inside the ridge (3), a return ditch (5) is provided on the periphery of the ridge (3), and an escape prevention net (6) is provided on the periphery of the return ditch (5).

2. The spiral Procambarus clarkii culture pond according to claim 1, characterized in that: The cross-sectional shape of the surrounding ridge (3) is a trapezoidal structure that is narrow at the top and wide at the bottom, and the cross-sectional shape of the return groove (5) is a trapezoidal structure that is wide at the top and narrow at the bottom.

3. The tortoise crayfish breeding pond according to claim 1, characterized in that: Anti-escape facilities are arranged around the periphery of the anti-escape net (6) along the ridge surface of the pond.

4. The culturing pond for Procambarus clarkii in a figure-eight shape according to claim 1, wherein: A water inlet is provided upstream of the pond body (1), and the water inlet is connected to an external water source, the return ditch (5) and the breeding area (2) through a water inlet pipe (7); wherein the water inlet pipe (7) has a water inlet and two water outlets, the water inlet of the water inlet pipe (7) is connected to the external water source, and one of the two water outlets of the water inlet pipe (7) faces the breeding area (2) and the other faces the return ditch (5).

5. The spiral Procambarus clarkii culture pond according to claim 1, characterized in that: A breeding area drainage outlet and a return ditch drainage outlet are provided downstream of the pond body (1); the breeding area drainage outlet is connected to the breeding area (2) via a breeding area drainage pipe (8); and the return ditch drainage outlet is connected to the return ditch (5) via a return ditch drainage pipe (9).

6. The spiral Procambarus clarkii breeding pond according to claim 4, characterized in that: The water inlet of the water inlet pipe (7) is equipped with a filtering facility to prevent wild fish or harmful organisms from entering.

7. The spiral Procambarus clarkii culture pond according to claim 5, characterized in that: The water outlets of the aquaculture area drainage pipe (8) and the return ditch drainage pipe (9) are equipped with filtering and escape prevention facilities for preventing escape and preventing wild fish or harmful organisms from entering.

8. A method for culturing Procambarus clarkii in a Procambarus clarkii culture pond of the type described in any one of claims 1 to 7, characterized in that, The following steps are included: S1. Pond reconstruction: First, a circular ditch (5) is excavated downward along the bottom of the pond slope according to 30% of the pond area, and then the soil excavated from the circular ditch (5) is rolled and compacted in layers around the breeding area (2) immediately following the circular ditch (5), and a ridge (3) is built, so that the breeding area (2) can store 0.5m of water without exceeding the ridge (4), and the circular ditch (5) can store 1.3m of water without exceeding the ridge (3). Then, a fence (4) is fixed around the side of the ridge (3) close to the breeding area (2), and an escape prevention net (6) is fixed around the side of the pond ridge close to the circular ditch (5). Finally, a water inlet pipe and a drainage pipe are installed in the breeding area (2) and the circular ditch (5), respectively; S2. Mixed rotation planting of Vallisneria, Hydrilla verticillata and Elodea in the aquaculture area: After the pond transformation is completed, Vallisneria sempervirens will be planted in the aquaculture area in March of the first year, with a planting area of ​​40%; Hydrilla verticillata will be planted in the aquaculture area in June of the first year, with a planting area of ​​10%; Elodea will be planted in the aquaculture area in October of the first year, with a planting area of ​​10%; S3. Management of Vallisneria, Hydrilla verticillata and Elodea in the aquaculture area: After Vallisneria is planted in March of the first year, there is no need to replant it later. It is only necessary to control the spread area of ​​Vallisneria within 60%; after Hydrilla verticillata is planted in June of the first year, depending on the budding and growth of Hydrilla verticillata in May of the following year, appropriate replanting or no replanting in June of the following year; after Elodea is planted in October of the first year, appropriate replanting or no replanting in October of the following year may be carried out according to the labor situation; S4. Planting of water hyacinth and paspalum in the ditch: After the pond reconstruction is completed, water hyacinth only needs to be planted in 30% of the ditch water surface area in June of the first year, and it should be blocked by floating baffles to prevent it from spreading to the whole pond; after the pond reconstruction is completed, paspalum only needs to be sown and planted on the slope of the ditch close to the pond bank in March of the first year; S5. Year-round breeding of Procambarus clarkii in the breeding area: In early March every year, 50 jin of Procambarus clarkii seedlings are released per mu of the breeding area, with 100 to 120 crawfish per jin. The crawfish seedlings are released into the breeding area. After the seedlings are released, feed is started. The feed amount should be such that the crawfish can eat it within 4 hours after feeding. The daily feed amount accounts for 8-10% of the body weight of the shrimp in the whole pond. This lasts until mid-April, when the first season of Procambarus clarkii breeding ends. In late April every year, 60 jin of Procambarus clarkii seedlings are released per mu of the breeding area, with 120 to 150 crawfish per jin. The crawfish seedlings are released into the breeding area. After the seedlings are released, feed is started. The daily feed amount accounts for 2-3% of the body weight of the shrimp in the whole pond. This controls the growth of the crawfish until early July. , ending the second season of high-temperature crawfish farming; in mid-July each year, according to the area of ​​the farming area, 60 catties of crawfish fry are released per mu, 100 to 120 tails per catty, and the crawfish fry are released into the farming area. After the release of the fry, feed is started, and the daily feed amount accounts for 8-10% of the body weight of the shrimp in the whole pond, until late August, ending the third season of high-temperature crawfish farming; in early September each year, according to the area of ​​the farming area, 60 catties of crawfish fry are released per mu, 100 to 120 tails per catty, and the crawfish fry are released into the farming area. After the release of the fry, feed is started, and the daily feed amount accounts for 5-8% of the body weight of the shrimp in the whole pond, until before February of the following year, all the adult shrimps in the farming area are caught and sold, ending the fourth season of winter crawfish farming; S6. Breeding of Procambarus clarkii seedlings in the ditch: In mid-April every year, the first batch of seed shrimps is released. That is, while the commercial shrimps are being caught and sold in the breeding area, high-quality Procambarus clarkii with large size, symmetrical body shape and sufficient vitality are selected and released into the ditch at a rate of 60 female shrimps / mu and 20 male shrimps / mu. The water level of the ditch is slowly lowered to 5cm within two weeks to force them to dig holes for mating, laying eggs and hatching. In early July every year, the operation of releasing seed shrimps for the first time is repeated and the second batch of seed shrimps is released. S7. Fishing of Procambarus clarkii seedlings in the ditch: Around March and September each year, use dense mesh cages to fish out shrimp seedlings from the ditch and transfer them to the culture area for breeding. If the number of shrimp seedlings is small, purchase some shrimp seedlings and increase the amount of seed shrimps released; if the number of shrimp seedlings is large, sell the shrimp seedlings and reduce the amount of seed shrimps released; in the rest of the months except March and September each year, the shrimp seedlings produced in the ditch can be used as a supplement and released to the culture area for breeding of finished shrimps; S8. Winter Crayfish Fishing: Winter Crayfish Fishing is carried out by lowering the water level to 0.4m and extending the time for catching ground traps; S9. Water quality management: During the breeding process, if the aquatic plants are fouled, organic acids and bacillus are used for treatment at noon on sunny days; if ciliates grow on the aquatic plants, zinc sulfate heptahydrate is used for treatment; during the breeding period, minerals are regularly supplemented to maintain the hardness index in the pond water body at 260 mg / L. S10. Removal of wild fish in the pond: In early March of each year, before the first fry stocking, tea seed cake is used to sprinkle the entire pond for the first weed removal; in early September of each year, before the fourth fry stocking, rotenone is used to sprinkle the entire pond for the second weed removal.

9. The Procambarus clarkii cultivation method according to claim 8, characterized in that, The slope ratio of the pond slope is 1:2.

5.

10. The Procambarus clarkii cultivation method according to claim 8, characterized in that, The enclosure net (4) is composed of several polyethylene mesh sheets, and adjacent polyethylene mesh sheets are fixedly connected by threading galvanized steel strands. The height of the enclosure net (4) is 1.5 m, and plastic films with a double-sided anti-escape structure are sewn on both sides of the enclosure net (4); the anti-escape net (6) is composed of a polyethylene mesh sheet with a plastic film attached or an anti-escape plastic film.

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