CN106614175A - Method for different-position mixed lobster breeding in same river adult crab aquaculture pond - Google Patents

Abstract

The invention discloses a method for different-position mixed lobster breeding in the same river adult crab aquaculture pond. The mixing breeding method comprises the steps of pond design, juvenile crab capture and stocking, juvenile lobster stocking and capture, lobster density control, feeding management, daily management and river crab capture and marketing. The method is characterized in pond design, juvenile procambarus clarkia density control, lobster larva supplementing at regular intervals and removal of lobsters in a river crab breeding area. By using the ecological breeding method, the yield of lobsters in deep ditches around the pond in per mu of pond is 35-50 Kg/mu, the adult crab yield of the river crab breeding area is about 70 Kg/mu, and the procambarus clarkia yield is about 10 Kg/mu. On the premise that the adult crab breeding cost is not increased basically, the net profit per mu of the river adult crab aquaculture pond is increased by 500-1000 yuan, the culture benefit is increased, and the risk of river crab single variety breeding is reduced.

Description

The method of ectopic polyculture of crayfish in the same pond of river crab adult crab culture pond

technical field

The invention belongs to the technical field of aquaculture, and in particular relates to a method for cultivating crayfish in different positions in the same pond in the same pond as river crabs.

Background technique

River crab, scientific name Chinese mitten crab; crayfish, scientific name Procambarus clarkii, both are very important special aquaculture species in China, and are cultivated in many provinces such as Jiangsu, Hubei, Anhui; because river crabs and crayfish are bottom Crustaceans that inhabit and live in crab ponds, and crayfish like Elodea, Hydra verticillium and other aquatic plants planted in crab ponds, so when the two live together, the activities of crayfish are not conducive to the growth of river crabs, and will reduce the survival rate of river crabs moulting; In farming practice, many farmers use quicklime, bleaching powder and other drugs to clear the pond before stocking crabs in the river crab pond at the beginning of the year, so as to kill bacteria, crayfish, small miscellaneous fish and other organisms; from the practical application effect, this kind of There are some disadvantages in the operation mode: (1) crayfish have the habit of burrowing around the pond to live through the winter, so it is difficult to completely remove crayfish in this way of clearing the pond; The space is also small. Most of the crayfish were killed when the pond was cleared, and this period was not fully utilized to turn the crayfish into commercial shrimp, which reduced the breeding income.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for ectopic polyculture of crayfish in the same pond for growing river crabs and crabs.

To achieve the above object, the technical scheme of the present invention is as follows:

The method for cultivating crayfish in different positions in the same pool of river crabs into crab culture ponds, the steps of the polyculture method are as follows:

(1) Pond design

(1.1) This breeding mode is mainly suitable for larger ponds with a width of 50-100m and a length of 150-400m;

(1.2) The bottom of the pond is surrounded by pond side ditch, the width of the pond side ditch is 4-8m, the depth is 1.2-1.5m, 0.6-0.8m deeper than the central platform, and the highest water depth of the central platform is 0.8m;

(1.3) The central platform accounts for 70-80% of the entire pond area and is mainly used for cultivating river crabs. There is a platform deep ditch with a depth of about 0.5m in the center of the central platform, which is used for the early temporary cultivation of river crabs. The platform deep ditch accounts for the total area of the pond About 15% of the total area of the pond, and the side ditches of the pond account for 20-30% of the entire pond area, which are mainly used for breeding crayfish;

(1.4) The side ditch of the pond near the central platform is separated from the central platform with a plastic net plate to ensure that 200-400/Kg of Procambarus clarkii seedlings and crab crab seedlings are basically not in the early stage of breeding. mixed;

(1.5) Anti-escape plastic boards are set up around the pond to prevent river crabs and Procambarus clarkii from escaping;

(2) Crab seed stocking

From January to February every year, compound aquatic plants are planted on both sides of the deep ditch of the platform and the side ditch of the pond. From the beginning of March to April, the crab seedlings are placed in the deep ditch of the platform for temporary cultivation. The temporary breeding density is 8000-10000/mu, converted into The stocking density of the whole pond is about 800/mu. With the growth of compound aquatic plants, the water level is gradually deepened to increase the activity space of river crabs;

(3) Stocking and fishing of lobster fry

When carrying out this breeding method for the first time, 8,000 lobster seedlings per mu were stocked in the ditch of the pond from March to April. Bianchuan usually does not need to stock crayfish fry in the second year. In order to prevent crayfish inbreeding from causing germplasm degradation, it is necessary to supplement some large-scale species of shrimp every 2-3 years to increase genetic diversity and prevent germplasm degradation;

(4) Density control of crayfish

Lobsters have two breeding peaks in spring and autumn every year. If there are too many lobster seedlings found in the ditch of the pond, they need to be removed in time to prevent the density from growing too high; if the density is low, they need to be supplemented appropriately; Lobster seedlings can enter the central platform through the seine net, so the central platform also needs to catch crayfish from July, regardless of size, all are removed, the prawns are sold, and the crayfish are placed in the side ditch of the pond to reduce the impact of crayfish on the growth of river crabs; After the river crabs are sold every year, in order to completely remove the crayfish on the central platform, it is necessary to use 100Kg per mu of bleaching powder to completely clear the pond to kill the remaining crayfish seedlings and broodstock; Leave 15cm of aquatic plants to oxidize and decompose bottom silt and organic matter. Since crayfish live in caves in winter, shallow water exposure has little effect on crayfish overwintering;

(5) Feeding management

Crayfish are usually fed feed with 36% protein, and the particle size is divided into 1.2mm, 1.6mm and 1.8mm, which are determined according to the growth stage of the lobster; river crabs are fed with 41%, 36%, 40% protein. Crab and adult crab feed, the particle size is 1.8mm, 2.5mm and 3.5mm respectively;

(6) Daily management

(6.1) Aquatic plants maintenance; remove floating aquatic plants in time, and "start" in time before the high temperature period comes to prevent rotten grass;

(6.2) Control of water quality and bottom quality; regularly drain sewage, inject new water, and use EM bacteria and bottom quality improvement agent to control water quality and bottom quality according to water quality;

(6.3) Do a good job in patrolling ponds, maintain facilities in time, and do a good job in preventing escape and theft;

(7) River crab fishing listed

Use crab pots or bare-hand fishing.

In one embodiment of the present invention, an aeration system is provided at the bottom of the side ditch of the pond and the deep ditch of the platform, and the average power of the aeration system is 0.2kw/667m ² .

In one embodiment of the present invention, the mesh size of the plastic grid tray is about 0.8 cm.

In one embodiment of the present invention, the composite aquatic plants are any one or more of Elodea, Hydrilla verticillium, and Erythria chinensis.

In one embodiment of the present invention, the available chlorine content of the bleaching powder is above 30%.

Through above-mentioned technical scheme, beneficial effect of the present invention is:

The present invention considers that crayfish live in caves around the pond in winter, and a central platform is set in the middle of the breeding pond to allow crabs to move on the central platform, and move the crayfish to the side ditch of the pond, which is beneficial to the better development of the crayfish. Life and growth, reduce the interference to crab feeding, molting and other activities; at the same time, a platform deep ditch is set in the middle of the central platform of the breeding pond, so that crab seedlings can be temporarily raised here in the early stage, which is also conducive to the growth of crab seedlings and improves moulting. Shell survival rate.

The key of the present invention is pond design, Procambarus clarkii fry seed density control, regularly replenishes the crayfish in the breeding area of shrimp and river crab and removes; Use this ecological breeding method, in every mu of ponds, the crayfish shrimp production of surrounding deep ditch is 35-50Kg/mu, the output of adult crabs in the river crab culture area is about 75Kg/mu, and the output of Procambarus clarkii is about 10Kg/mu; the present invention can make the river crab culture pond every Mu increases the net profit of 500-1000 yuan, improves the breeding efficiency, and reduces the risk of single-species breeding of river crabs.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the sectional view of raising pond of the present invention;

The corresponding part names indicated by numbers and letters in the figure:

10. Pond side ditch 20. Central platform 30. Platform deep ditch 40. Plastic network disk 50. Escape prevention plastic board.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

Example 1

The invention discloses a method for cultivating river crabs and crabs in different positions in the same pond for culturing crayfish in different positions. The steps of the polyculture method are as follows:

(1) The design of the pond (see Figure 1)

(1.1) This breeding mode is mainly suitable for larger ponds, the pond is 50m wide and 150m long;

(1.2) The bottom of the pond is surrounded by pond side ditch 10, the width of the pond side ditch is 4m, the depth is 1.2m, 0.6m deeper than the central platform 20, and the highest water depth of the central platform is 0.8m;

(1.3) central platform accounts for 70% of whole pond area, is mainly used for cultivating river crabs, and the center of central platform is provided with platform deep ditch 30 about depth 0.5m, is used for river crab early stage temporary cultivation, and platform deep ditch accounts for 10% of pond total area About 15%, the pond ditch accounts for 20% of the entire pond area, and is mainly used to raise crayfish;

(1.4) The side ditch of the pond near the central platform separates the central platform from the pond side ditch with a plastic net plate 40, and the mesh size of the plastic net pan is about 0.8cm to ensure 200/Kg of Procambarus clarkii fry Crab seedlings are basically not mixed in the early stage of breeding;

(1.5) The anti-escape plastic plate 50 is set around the pond to prevent river crabs and Procambarus clarkii from escaping; the bottom of the side ditch of the pond and the deep ditch of the platform is provided with an aeration system, and the average power of the aeration system is 0.2kw/667m ² ;

(2) Crab seed stocking

On January 20th of each year, plant Elodea, Hydrilla verticillium and bitter grass on both sides of the deep ditch of the platform and the side ditch of the pond. On March 5th, seedlings of buckle crabs are placed in the deep ditch of the platform for temporary breeding, and the temporary breeding density is 8000/ Mu (converted into the stocking density of the whole pond is about 800/mu), with the growth of compound aquatic plants, the water level is gradually deepened, increasing the activity space of river crabs;

(3) Stocking and fishing of lobster fry

On March 10th, 8,000 lobster seedlings (300/Kg) were stocked per mu in the side ditches of the pond. From May 12th, ground cages were used to catch the big ones and keep the small ones; the pond side ditch usually does not need to be stocked in the second year For crayfish fry, in order to prevent germplasm degradation caused by inbreeding of crayfish, it is necessary to supplement some large-scale seedlings every 2 years to improve genetic diversity and prevent germplasm degradation;

(4) Density control of crayfish

Lobsters have two breeding peaks in spring and autumn every year. If there are too many lobster seedlings found in the ditch of the pond, they need to be removed in time to prevent the density from growing too high; if the density is low, they need to be supplemented appropriately; The lobster seed can enter the central platform through the seine net, so the central platform will start to catch crayfish from July 5th, regardless of size, all will be removed, the prawns will be sold, and the prawns will be placed in the side ditch of the pond to reduce the impact of crayfish on the growth of river crabs ; After the river crabs are sold every year, in order to completely remove the crayfish on the central platform, it is necessary to use 100Kg of bleaching powder per mu to completely clear the pond to kill the remaining crayfish fry and broodstock. The available chlorine content of the bleaching powder is above 30%; Only drain the shallow pool water and expose to the sun for 3 weeks, leaving 15cm of aquatic plants at the bottom, so that the bottom silt and organic matter can be oxidized and decomposed. Since crayfish live in caves in winter, shallow water exposure has little effect on crayfish overwintering;

(5) Feeding management

Crayfish are usually fed feed with 36% protein, and the particle size is divided into 1.2mm, 1.6mm and 1.8mm, which are determined according to the growth stage of the lobster; river crabs are fed with 41%, 36%, 40% protein. Crab and adult crab feed, the particle size is 1.8mm, 2.5mm and 3.5mm respectively;

(6) Daily management

(6.1) Aquatic plants maintenance; remove floating aquatic plants in time, and "start" in time before the high temperature period comes to prevent rotten grass;

(6.2) Control of water quality and bottom quality; regularly drain sewage, inject new water, and use EM bacteria and bottom quality improvement agent to control water quality and bottom quality according to water quality;

(6.3) Do a good job in patrolling ponds, maintain facilities in time, and do a good job in preventing escape and theft;

(7) River crab fishing listed

Use crab pots or bare-hand fishing.

Example 2

The invention discloses a method for cultivating river crabs and crabs in different positions in the same pond for culturing crayfish in different positions. The steps of the polyculture method are as follows:

(1) The design of the pond (see Figure 1)

(1.1) This breeding mode is mainly suitable for larger ponds, the pond is 75m wide and 275m long;

(1.2) The bottom of the pond is surrounded by pond side ditch 10, the width of the pond side ditch is 6m, the depth is 1.35m, 0.7m deeper than the central platform 20, and the highest water depth of the central platform is 0.8m;

(1.3) central platform accounts for 75% of whole pond area, is mainly used for cultivating river crabs, and the center of central platform is provided with platform deep ditch 30 about depth 0.5m, is used for river crab early stage temporary cultivation, and platform deep ditch accounts for 10% of pond total area About 15%, the pond side ditches account for 25% of the entire pond area, mainly used for breeding crayfish;

(1.4) The side ditch of the pond near the central platform separates the central platform from the pond side ditch with a plastic net plate 40, and the mesh size of the plastic net pan is about 0.8cm to ensure 300/Kg of Procambarus clarkii fry Crab seedlings are basically not mixed in the early stage of breeding;

(1.5) The anti-escape plastic plate 50 is set around the pond to prevent river crabs and Procambarus clarkii from escaping; the bottom of the side ditch of the pond and the deep ditch of the platform is provided with an aeration system, and the average power of the aeration system is 0.2kw/667m ² ;

(2) Crab seed stocking

On February 5th, plant Elodea, Hydrilla verticillium, and bitter grass on both sides of the deep ditch of the platform and the side ditch of the pond. On March 20, put the seedlings of crabs in the deep ditch of the platform for temporary cultivation, and the temporary breeding density is 9000/mu (Converted into the stocking density of the whole pond is about 800/mu), with the growth of compound aquatic plants, the water level is gradually deepened, increasing the activity space of river crabs;

(3) Stocking and fishing of lobster fry

On March 15th, 8,000 lobster seedlings (350/Kg) were stocked per mu in the side ditches of the pond. From May 6th, ground cages were used to catch the big ones and keep the small ones; the pond side ditch usually does not need to be stocked in the second year For crayfish fry, in order to prevent germplasm degradation caused by inbreeding of crayfish, it is necessary to supplement some large-scale seedlings every 2 years to improve genetic diversity and prevent germplasm degradation;

(4) Density control of crayfish

Lobsters have two breeding peaks in spring and autumn every year. If there are too many lobster seedlings found in the ditch of the pond, they need to be removed in time to prevent the density from growing too high; if the density is low, they need to be supplemented appropriately; The lobster seed can enter the central platform through the seine net, so the central platform will start to catch crayfish from July 8, regardless of the size, all will be removed, the prawns will be sold, and the crayfish will be placed in the ditch of the pond to reduce the impact of crayfish on the growth of river crabs ; After the river crabs are sold every year, in order to completely remove the crayfish on the central platform, it is necessary to use 100Kg of bleaching powder per mu to completely clear the pond to kill the remaining crayfish fry and broodstock. The available chlorine content of the bleaching powder is above 30%; Only drain the shallow pool water and expose to the sun for 3 weeks, leaving 15cm of aquatic plants at the bottom, so that the bottom silt and organic matter can be oxidized and decomposed. Since crayfish live in caves in winter, shallow water exposure has little effect on crayfish overwintering;

(5) Feeding management

Crayfish are usually fed feed with 36% protein, and the particle size is divided into 1.2mm, 1.6mm and 1.8mm, which are determined according to the growth stage of the lobster; river crabs are fed with 41%, 36%, 40% protein. Crab and adult crab feed, the particle size is 1.8mm, 2.5mm and 3.5mm respectively;

(6) Daily management

(6.1) Aquatic plants maintenance; remove floating aquatic plants in time, and "start" in time before the high temperature period comes to prevent rotten grass;

(6.2) Control of water quality and bottom quality; regularly drain sewage, inject new water, and use EM bacteria and bottom quality improvement agent to control water quality and bottom quality according to water quality;

(6.3) Do a good job in patrolling ponds, maintain facilities in time, and do a good job in preventing escape and theft;

(7) River crab fishing listed

Use crab pots or bare-hand fishing.

Example 3

The invention discloses a method for cultivating river crabs and crabs in different positions in the same pond for culturing crayfish in different positions. The steps of the polyculture method are as follows:

(1) The design of the pond (see Figure 1)

(1.1) This breeding mode is mainly suitable for larger ponds, the pond is 100m wide and 400m long;

(1.2) The bottom of the pond is surrounded by pond side ditch 10, the width of the pond side ditch is 8m, the depth is 1.5m, 0.8m deeper than the central platform 20, and the highest water depth of the central platform is 0.8m;

(1.3) central platform accounts for 80% of whole pond area, is mainly used for cultivating river crabs, and the center of central platform is provided with platform deep ditch 30 about depth 0.5m, is used for river crab early stage temporary cultivation, and platform deep ditch accounts for 10% of pond total area About 15%, the pond side ditches account for 30% of the entire pond area, mainly used for breeding crayfish;

(1.4) The side ditch of the pond near the central platform separates the central platform from the pond side ditch with a plastic net plate 40, and the mesh size of the plastic net pan is about 0.8cm to ensure 400/Kg of Procambarus clarkii fry There is basically no mixing with button crab seedlings in the early stage of culture;

(1.5) The anti-escape plastic plate 50 is set around the pond to prevent river crabs and Procambarus clarkii from escaping; the bottom of the side ditch of the pond and the deep ditch of the platform is provided with an aeration system, and the average power of the aeration system is 0.2kw/667m ² ;

(2) Crab seed stocking

On February 20th, plant Elodea, Hydrilla verticillium and bitter grass on both sides of the deep ditch of the platform and the side ditch of the pond. On April 6th, put the crab seedlings in the deep ditch of the platform for temporary breeding, and the temporary breeding density is 10,000/mu (Converted into the stocking density of the whole pond is about 800/mu), with the growth of compound aquatic plants, the water level is gradually deepened, increasing the activity space of river crabs;

(3) Stocking and fishing of lobster fry

On April 2nd, 8,000 lobster seedlings (400/Kg) were stocked per mu in the side ditches of the pond. From May 10th, ground cages were used to catch the big ones and keep the small ones; the pond side ditch usually does not need to be stocked in the second year For crayfish fry, in order to prevent crayfish inbreeding from causing germplasm degradation, it is necessary to supplement some large-scale seedlings every 3 years to improve genetic diversity and prevent germplasm degradation;

(4) Density control of crayfish

Lobsters have two breeding peaks in spring and autumn every year. If there are too many lobster seedlings found in the ditch of the pond, they need to be removed in time to prevent the density from growing too high; if the density is low, they need to be supplemented appropriately; The lobster seed can enter the central platform through the seine net, so the central platform starts to catch crayfish from the 8th, remove all regardless of size, sell the prawns, and put the crayfish in the side ditch of the pond to reduce the impact of crayfish on the growth of river crabs; every year After the river crab is sold, in order to completely remove the crayfish on the central platform, it is necessary to use 100Kg per mu of bleaching powder to completely clear the pond to kill the remaining crayfish fry and broodstock. The available chlorine content of the bleaching powder is above 30%; Shallow pool water is exposed to the sun for 4 weeks, leaving 15cm of aquatic plants at the bottom, which allows the bottom silt and organic matter to be oxidized and decomposed. Since crayfish live in caves in winter, shallow water exposure has little effect on crayfish overwintering;

(5) Feeding management

Crayfish are usually fed feed with 36% protein, and the particle size is divided into 1.2mm, 1.6mm and 1.8mm, which are determined according to the growth stage of the lobster; river crabs are fed with 41%, 36%, 40% protein. Crab and adult crab feed, the particle size is 1.8mm, 2.5mm and 3.5mm respectively;

(6) Daily management

(6.1) Aquatic plants maintenance; remove floating aquatic plants in time, and "start" in time before the high temperature period comes to prevent rotten grass;

(6.2) Control of water quality and bottom quality; regularly drain sewage, inject new water, and use EM bacteria and bottom quality improvement agent to control water quality and bottom quality according to water quality;

(6.3) Do a good job in patrolling ponds, maintain facilities in time, and do a good job in preventing escape and theft;

(7) River crab fishing listed

Use crab pots or bare-hand fishing.

Adopt above embodiment to carry out river crab into crab culture pond and pond heterotopia polyculture crayfish, compare with traditional river crab culture, its cultivation situation is as follows when cultivating to adult crab listing:

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. river crab becomes the method for crab culture pond heterotopia polyculture crayfish in pond, it is characterized in that, the step of described polyculture method is as follows: (1) Pond design (1.1) This breeding mode is mainly suitable for larger ponds with a width of 50-100m and a length of 150-400m; (1.2) The bottom of the pond is surrounded by pond side ditch, the width of the pond side ditch is 4-8m, the depth is 1.2-1.5m, 0.6-0.8m deeper than the central platform, and the highest water depth of the central platform is 0.8m; (1.3) The central platform accounts for 70-80% of the entire pond area and is mainly used for cultivating river crabs. There is a platform deep ditch with a depth of about 0.5m in the center of the central platform, which is used for the early temporary cultivation of river crabs. The platform deep ditch accounts for the total area of the pond About 15% of the total area of the pond, and the side ditches of the pond account for 20-30% of the entire pond area, which are mainly used for breeding crayfish; (1.4) The side ditch of the pond near the central platform is separated from the central platform with a plastic net plate to ensure that 200-400/Kg of Procambarus clarkii seedlings and crab crab seedlings are basically not in the early stage of breeding. mixed; (1.5) Anti-escape plastic boards are set up around the pond to prevent river crabs and Procambarus clarkii from escaping; (2) Crab seed stocking From January to February every year, compound aquatic plants are planted on both sides of the deep ditch of the platform and the side ditch of the pond. From the beginning of March to April, the crab seedlings are placed in the deep ditch of the platform for temporary cultivation. The temporary breeding density is 8000-10000/mu, converted into The stocking density of the whole pond is about 800/mu. With the growth of compound aquatic plants, the water level is gradually deepened to increase the activity space of river crabs; (3) Stocking and fishing of lobster fry When carrying out this breeding method for the first time, 8,000 lobster seedlings per mu were stocked in the ditch of the pond from March to April. Bianchuan usually does not need to stock crayfish fry in the second year. In order to prevent crayfish inbreeding from causing germplasm degradation, it is necessary to supplement some large-scale species of shrimp every 2-3 years to increase genetic diversity and prevent germplasm degradation; (4) Density control of crayfish Lobsters have two breeding peaks in spring and autumn every year. If there are too many lobster seedlings found in the ditch of the pond, they need to be removed in time to prevent the density from growing too high; if the density is low, they need to be supplemented appropriately; Lobster seedlings can enter the central platform through the seine net, so the central platform also needs to catch crayfish from July, regardless of size, all are removed, the prawns are sold, and the crayfish are placed in the side ditch of the pond to reduce the impact of crayfish on the growth of river crabs; After the river crabs are sold every year, in order to completely remove the crayfish on the central platform, it is necessary to use 100Kg per mu of bleaching powder to completely clear the pond to kill the remaining crayfish seedlings and broodstock; Leave 15cm of aquatic plants to oxidize and decompose bottom silt and organic matter. Since crayfish live in caves in winter, shallow water exposure has little effect on crayfish overwintering; (5) Feeding management Crayfish are usually fed feed with 36% protein, and the particle size is divided into 1.2mm, 1.6mm and 1.8mm, which are determined according to the growth stage of the lobster; river crabs are fed with 41%, 36%, 40% protein. Crab and adult crab feed, the particle size is 1.8mm, 2.5mm and 3.5mm respectively; (6) Daily management (6.1) Aquatic plants maintenance; remove floating aquatic plants in time, and "start" in time before the high temperature period comes to prevent rotten grass; (6.2) Control of water quality and bottom quality; regularly drain sewage, inject new water, and use EM bacteria and bottom quality improvement agent to control water quality and bottom quality according to water quality; (6.3) Do a good job in patrolling ponds, maintain facilities in time, and do a good job in preventing escape and theft; (7) River crab fishing listed Use crab pots or bare-hand fishing. 2. the river crab according to claim 1 becomes the method for cultivating pond crayfish in different positions in the same pond, it is characterized in that, the bottom of the side ditch of the pond and the deep ditch of the platform is provided with an aeration system, and the aeration system of the aeration system The average power is 0.2kw/667m ² . 3. the method for growing crabs from river crabs according to claim 1 in the same pond as ectopic polyculture crayfish, characterized in that the mesh size of the plastic mesh tray is about 0.8cm. 4. the river crab according to claim 1 becomes the method for cultivating crabs in the same pond as heterotopic polyculture crayfish, characterized in that, the composite aquatic plants are any one or more of Elodea, Hydrilla verticillium, and Erythrina chinensis kind. 5. the method for growing crabs from river crabs according to claim 1 and cultivating ponds with heterotopic crayfish in the same pond, characterized in that, the available chlorine content of the bleaching powder is more than 30%.