A method for cave culture of procambarus clarkii seedlings

Abstract

A method for cave cultivation of procambarus clarkia seedlings, comprising the following steps: rice field selection, rice planting, parent shrimp preparation before stocking, parent shrimp stocking, parent shrimp cultivation, stress cave digging and cave entering, field drying, rice harvesting, rice stubble green-up, cave cultivation, induced cave exiting and cage catching; wherein the rice field selection is to select a rice field with sufficient water source and convenient irrigation and drainage, the relative two sides of the field have height difference, the field ridge is reinforced and has a mouse, frog and snake prevention iron fence, and a polyethylene net is surrounded along the inner side of the field ridge; the parent shrimp stocking is to stock female parent shrimp with ovary maturity of stage III, and the female to male ratio is 1:1; the parent shrimp cultivation comprises feed feeding, water quality control and daily management; the stress cave digging and cave entering is to drain water; the rice harvesting is after the field drying; the rice stubble green-up is to keep shallow water to promote growth after the rice harvesting until new grass seedlings are generated; the cave cultivation is to regularly pour horse race water rich in food; and the induced cave exiting is to induce by water injection and feed feeding. The cave cultivation method can improve the survival rate of the seedlings and the parent shrimp.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aquaculture breeding, and particularly relates to a method for cave cultivation of procambarus clarkia seedlings. BACKGROUND

[0002] Procambarus clarkia (Girard, 1852) belongs to Crustacea, Decapoda, Astacidae and Cambarus, and is also known as small dragon lobster and red claw lobster. Procambarus clarkii It is a freshwater economic shrimp, inhabits in streams and marshes, and temporary habitats include ditches and ponds, is usually mixed with plants or wood debris together, can destroy and weaken the embankment, and mainly lives in wetlands, lakes and ditches with abundant waterweeds and shallow water. Procambarus clarkia has the characteristics of fast growth speed, miscellaneous food, strong adaptability, low oxygen tolerance, less disease, easy breeding and transportation, etc., is rich in nutrition, tender in meat quality, and delicious in taste. At present, spicy small dragon lobster has become a famous dish on people's table, the market demand of small dragon lobster in China increases dramatically, and the export of shrimp meat, whole shrimp and shrimp ball products processed in China is also in short supply. The deep processing scale of by-products such as shrimp yellow and chitin is gradually expanded, so that the wild resource quantity of procambarus clarkia in China decreases dramatically. As the market consumption quantity and the export processing quantity of procambarus clarkia increase rapidly, the wild resource quantity thereof is decreasing dramatically, therefore, the method of artificial breeding to increase the yield of procambarus clarkia has become one of important ways to meet the processing export and consumption market demand, thereby driving the rapid development of procambarus clarkia breeding industry in China.

[0003] In order to adapt to the living habits of procambarus clarkia, it is usually bred in a natural way, that is, soil pool breeding. For the breeding of procambarus clarkia, there are many ways, including rice-shrimp co-culture, rice-shrimp relay cropping, pond main breeding, shrimp-crab mixed breeding, shrimp-gudgeon mixed breeding, shrimp-turtle mixed breeding, etc., among which, the scale of rice field breeding and pond breeding is larger. Rice field breeding is a breeding mode of one field and two uses, one water and two uses, and combination of planting and breeding. Small dragon lobster grows in the rice field, eats a large number of pests and insect eggs, and its activity can also loosen the soil for the rice root system. The excrement of small dragon lobster is absorbed by the rice, which promotes the growth of the rice. The oxygen produced by the photosynthesis of the rice is beneficial to the growth of small dragon lobster, and greatly reduces the use of pesticides in rice planting, which is a very environmentally friendly ecological breeding mode. At present, the procambarus clarkia seedlings required for breeding mainly come from natural water areas. With the decrease of natural resource quantity, artificial breeding of procambarus clarkia has become a trend. Some procambarus clarkia breeding technologies are reported in public documents, and the quoted excerpts are as follows:

[0004] 1. Chinese patent: A method for artificial breeding of procambarus clarkii in a soil pool, application number: 201810744888.8, application date: 2018.07.09, abstract: The present application discloses a method for artificial breeding of procambarus clarkii in a soil pool. The method simulates the natural breeding conditions of crayfish by controlling the sex ratio of parent crayfish, the protein ratio of parent crayfish feed and the water temperature during the breeding period, promotes the maturation of female crayfish gonads, shortens the breeding period, and promotes female crayfish to lay more eggs. After the female crayfish lay eggs, the method separates the fry from the female crayfish immediately, avoids the parent crayfish killing the fry, feeds the fry according to their activity, feeding and development, and feeds them on demand, so that the fry can grow without intestinal diseases. The method uses a soil pool to breed procambarus clarkii, the quality of the fry is good, the survival rate of the fry is high, and the yield and benefit are greatly improved. At the same time, the method uses ordinary foam boxes or plastic square barrels for incubation, the size of the fry is uniform, and the cost of fry breeding is low, which is easy to popularize.

[0005] 2. Chinese patent: A method for breeding spring fry of procambarus clarkii in a pond, application number: 201410440459.3, application date: 2014.09.01, abstract: The present application provides a method for breeding spring fry of procambarus clarkii in a pond. The "pot bottom shape" pond structure is changed to "ring ditch + shallow beach" structure, which is beneficial to increase the breeding area of small crayfish, complete pond freezing and thawing, and increase the feeding area. The method of gradually reducing water is used to induce small crayfish to dig holes for overwintering and breeding, and rice straw is used for heat preservation. Water grass is set in two stages, and wave-shaped pottery tile shelters are set between the water grass to increase the habitat area of small crayfish and provide fresh green feed. Fertilization is carried out in three stages to cultivate sufficient natural bait organisms, which ensures the fertility of the pond water, is beneficial to the rapid growth of water grass, and cultivates sufficient high-quality natural bait organisms for small crayfish to feed. The above measures have the advantages of enhancing the body condition of small crayfish, improving the overwintering survival rate of small crayfish, reducing the probability of fry self-killing, improving the proportion of spring fry and the uniformity of fry size, etc., which is of great significance to improving the unit fry yield and economic benefit of the pond.

[0006] 3. Chinese patent: A method for large-scale breeding of procambarus clarkii in rice fields, application number: 202011180993.7, application date: 2020.10.29, abstract: The present application discloses a method for large-scale breeding of procambarus clarkii in rice fields, which comprises the following steps: raising the height of the rice field ridge, excavating a small ring ditch, leveling the breeding area and surrounding the plastic film to prevent escape, vertically surrounding the plastic film from the bottom of the small ring ditch, leveling the rice field surface within the small ring ditch as the breeding area, planting rice or water grass in the breeding area, and releasing procambarus clarkii parent shrimp into the field when the water level in the breeding area is 15 cm, and the roots of the rice or water grass have grown. The present application overcomes the defects of procambarus clarkii breeding in rice fields, such as high proportion of large ring ditches affecting rice production and rice field ridge leakage or collapse, and difficulty in large-scale production of procambarus clarkii fry, thereby stabilizing rice production in rice fields and protecting the breeding rice field ridge from damage, and enabling large-scale production of procambarus clarkii fry.

[0007] 4. Chinese patent: A method for in-situ breeding of procambarus clarkii in winter idle rice fields, application number: 201910264357.3, application date: 2019.04.03, abstract: The present application provides a method for in-situ breeding of procambarus clarkii in winter idle rice fields, which aims to: adopt the in-situ breeding mode of procambarus clarkii in winter idle rice fields, which can make full use of winter idle rice fields, solve the problem of shortage of procambarus clarkii fry through in-situ breeding, and promote the stable development of rice and shrimp farming. The present application effectively improves the in-situ breeding capacity of procambarus clarkii and increases the yield of fry through key technologies such as (2) parent intensive cultivation, (3) parent cross and egg clutching, (4) straw stubble retention and water level control, (6) winter and spring water level management, and (8) spring juvenile shrimp cultivation.

[0008] Through production research, it is found that the procambarus clarkii breeding disclosed in the above-mentioned document is obtained by mating and egg clutching of adult shrimp, however, procambarus clarkii has the habit of digging and hiding in caves for spawning and breeding, and also has the habit of killing each other, which results in low survival rate of fry and parent shrimp. Therefore, there is an urgent need for a breeding method that can improve the survival rate of fry and parent shrimp. SUMMARY

[0009] The present application aims to provide a method for breeding procambarus clarkii fry in caves, which solves the problem of low survival rate of procambarus clarkii fry and parent shrimp in rice and shrimp co-culture.

[0010] The present application is achieved by using the following technical solutions:

[0011] A method for breeding procambarus clarkii fry in caves, which comprises the following steps: rice field selection, rice planting, parent shrimp preparation before release, parent shrimp release, parent shrimp cultivation, stress-induced digging and hiding in caves, field drying, rice harvesting, rice stubble regreening, cave breeding, induced cave exit and cage capture.

[0012] The rice field selection is to select a rice field with sufficient water source and convenient irrigation, and the relative two sides of the field have a height difference of 10-15 cm, the field ridge is reinforced and has a fence of anti-mouse, frog and snake iron sheet with a height of more than 40 cm above the top surface of the field ridge, and a polyethylene net is surrounded around the field ridge to prevent the parent shrimps from digging holes and entering the hole.

[0013] The rice planting is to plant rice and manage according to the conventional method according to the season.

[0014] The preparation before the parent shrimp stocking is to, in the middle and late July to August every year, when the second crop of rice or the regenerative rice seedlings grow to more than 20 cm, water is injected into the field to a water depth of 10-15 cm, 6.0-7.5 kg of tea bran and 2.0-2.5 kg of lime are soaked for 2-5 days, and then the water in the whole field is uniformly sprayed to kill fish and snails and completely clean the field.

[0015] The parent shrimp stocking is to, after the field is completely cleaned for 5-7 days, when the water depth is more than 25 cm, the parent shrimp with ovary maturity of stage III is stocked, and the female to male ratio is 1:1.

[0016] The parent shrimp cultivation includes feeding, water quality control and daily management. The feeding is to feed the special compound feed at a rate of 2.5-3.0% of the body weight of the shrimp once a day on the day after the parent shrimp is stocked, and to feed the ionized calcium in the feed at a rate of 2.0-2.5% of the daily feed weight for 1-2 days every 10-15 days. The water quality control is to change the water once every 10-15 days, to drain 20-30% of the field water, to inject new water filtered by three layers of 20, 40 and 80 mesh silk screens to the original water level, and to uniformly spray 4.0-5.0 kg of lime per mu of field water on the whole field water surface after the water is injected. The daily management is to patrol more than once a day to observe the feeding condition of the shrimps and the change of the water quality, to treat the problems in time, to keep the water depth of the field surface at 25-40 cm to prevent birds, to pay attention to the weather change, to uniformly spray 4.0-5.0 kg of lime per mu on the whole field water surface 2 days before the temperature changes, and to adjust the feeding amount or stop feeding according to the weather change.

[0017] The stress digging hole and entering the hole is to, in September-October every year, after the second crop of rice or the regenerative rice is filled, the male shrimps are captured and sold for 4-5 days, the water is quickly drained to completely expose the field surface, and the parent shrimps are stressed to dig holes and enter the holes.

[0018] The field drying is to drain the water in the field after the parent shrimps dig holes and enter the holes, and to dry the field until the field surface cracks with a crack of more than 0.5 cm.

[0019] The rice harvesting is to harvest the rice after the field is dried, when 80-85% of the rice ears are mature.

[0020] The rice pile returns green is that after the rice is harvested, water is injected into the field to keep the field surface wet, and 40-50 kg of compound fertilizer is applied per mu, water is irrigated once a day until the field surface is wet and then is drained, which is continuously performed for 2-3 days, the soil is kept wet to promote axillary bud germination; then water is injected into the field to keep the water depth at 3-5 cm, and shallow water is kept to promote growth until the newly grown rice seedlings grow to more than 30 cm.

[0021] The cave cultivation is divided into early cultivation, middle cultivation and late cultivation, the early cultivation is 5-6 days, after the parent shrimps dig holes and enter the cave for 30-40 days, mixed nutrient water is injected into the rice field for the parent shrimps and the shrimplets to feed, the mixed nutrient water is irrigated once every 2-3 days until the cave is full of water and then is drained; the middle cultivation is performed 4-9 days after the early cultivation, the mixed nutrient water is irrigated once every 2-3 days until the cave is full of water and then is drained, and the irrigation is continuously performed for 2-3 times; the late cultivation is performed 6-12 days after the middle cultivation, the mixed nutrient water is irrigated once every 2-3 days until the cave is full of water and then is drained, and the irrigation is continuously performed for 3-4 times.

[0022] The induction of the cave is that after the cave cultivation, water is injected into the field to keep the water depth at 25-30 cm, and then 1.5-2.0 kg of special compound feed is fed per mu of rice field per day, which is continuously performed for 5-7 days to induce the parent shrimps and the shrimplets to exit the cave.

[0023] The cage capture is that the next day after the induction of the cave is ended, the parent shrimps and the shrimplets exiting the cave are captured in a cage every day until no shrimps enter the cage; the captured shrimplets are cultivated in a single pool according to the size or are harvested and sold, and the captured parent shrimps are concentrated for fattening and sold.

[0024] It is further preferred that the polyethylene net is a polyethylene net with a 1 cm mesh.

[0025] It is further preferred that the mixed nutrient water is prepared by the following process: floating animals such as rotifers are cultivated in a pool, 20-30 cubic meters of surface water under the middle light in the pool is extracted into a small pool at night one day before irrigation by using the phototaxis characteristics of the floating animals; then 1.5-3.0 kg of dry soybeans per mu of rice field is ground to prepare 15-30 liters of soybean milk, the soybean milk is added to the small pool and is stirred uniformly, and then is irrigated into the rice field through a pipeline until the field surface is wet, and then the water in the field is drained.

[0026] Procambarus clarkii has the habit of digging holes to lay eggs and breeding, and big prawns eat small prawns. If not artificially intervened, during the period of laying eggs and breeding of parent prawns, the food sources of the prawn larvae in the hole and the postpartum parent prawns are less, and the postpartum parent prawns will eat part of the prawn larvae. The postpartum parent prawns also die due to insufficient food sources, poor physical condition of the parent prawns, and postpartum parent prawns out of the hole due to molting failure, resulting in low survival rate of parent prawns and prawn larvae. According to statistics, only less than 30 prawn larvae survive in each hole. The method of breeding the prawn larvae in the hole of the procambarus clarkii realizes the rice-prawn co-cultivation. The mature parent prawns of the female parent prawns are put in the rice field, and the female to male ratio is 1:1. After mating, the male prawns are caught out of the rice field before the parent prawns are forced to dig holes, so as to avoid the damage of male prawns to female prawns and prawn larvae. During the period of laying eggs and breeding of parent prawns, the hole is continuously filled with food-rich running water to provide food sources for prawn larvae and postpartum parent prawns, thereby improving the survival rate of prawn larvae in the hole, improving the physical condition of the parent prawns in the hole, avoiding the death of postpartum parent prawns out of the hole due to molting failure, and further improving the survival rate of parent prawns in the hole. In addition, the method of breeding the prawn larvae in the hole of the procambarus clarkii of the present application injects water into the field the day after the rice is harvested to keep the field surface wet, and applies 40-50 kg of compound fertilizer per mu, irrigates the field once a day until the field surface is wet, and then drains the water, which is continuously done for 2-3 days to keep the soil moist and promote axillary bud germination. Then, water is injected into the field to a water depth of 3-5 cm to keep the water shallow to promote growth until the newly grown rice seedlings grow to more than 30 cm, so as to realize the green return of rice stubbles and provide a good growth environment for prawn larvae. DETAILED DESCRIPTION

[0027] In order to more clearly describe the present technology, the present technology is further described in detail below in combination with the drawings and examples.

[0028] Example 1

[0029] A method for breeding prawn larvae in a hole of procambarus clarkii, comprising rice field selection, rice planting, parent prawn preparation before stocking, parent prawn stocking, parent prawn breeding, forced hole digging, field drying, rice harvesting, rice stubble green return, hole breeding, induced hole exit, and cage capture.

[0030] The rice field selection is to select a rice field with sufficient water source and convenient irrigation and drainage, and the relative two sides of the field surface have a height difference of 10-15 cm, the field ridge is reinforced and has a mouse, frog and snake prevention iron sheet fence which is higher than the top surface of the field ridge by more than 40 cm, and a 1 cm mesh polyethylene net is arranged around the field ridge to prevent parent prawns from digging holes in the field ridge.

[0031] The rice planting is to plant rice and manage according to the conventional method according to the season.

[0032] The parent shrimp pre-release preparation is in the middle and late July to August every year, when the second crop of rice or the green regenerative rice seedlings grow to more than 20 cm, water is injected into the field to a depth of 10-15 cm, 6.0 kg of tea bran and 2.0 kg of lime are soaked for 2 days per mu of rice field, and then the water body is uniformly sprayed all over the field to kill fish and snails and thoroughly clean the field.

[0033] The parent shrimp release is 5 days after the field is thoroughly cleaned, when the water is injected into the field to a depth of more than 25 cm, the parent shrimp with ovary maturity of stage III is released, and the female to male ratio is 1:1.

[0034] The parent shrimp cultivation includes feeding, water quality control and daily management.

[0035] The stress tunneling and entering the hole is in September-October every year, when the second crop of rice or the regenerative rice is filled, the male shrimp is captured in a cage and sold for 4-5 days, then the water is quickly drained to completely expose the field surface, and the parent shrimp is forced to tunnel and enter the hole.

[0036] The field drying is after the parent shrimp tunnels and enters the hole, the field water is drained, and the field is dried until the field surface cracks with cracks of more than 0.5 cm.

[0037] The rice harvesting is after the field drying, when 80-85% of the rice ears are mature, the rice is harvested.

[0038] The rice stubble green-up is the next day after the rice is harvested, water is injected into the field to keep the field surface wet, and 40 kg of compound fertilizer is applied per mu, the field is irrigated once a day until the field surface is wet, then the water is drained, and this process is repeated for 2 days to keep the soil moist and promote axillary bud germination; then water is injected into the field to a depth of 3-5 cm to keep the water shallow to promote growth until the newly grown rice seedlings grow to more than 30 cm.

[0039] The cave cultivation is divided into early cultivation, middle cultivation and late cultivation, the early cultivation is 5 days, after the parent shrimp tunnels and enters the hole for 30 days, mixed nutrient water is injected into the field to provide food for the parent shrimp and shrimp fry, and the mixed nutrient water is injected once a day until the cave is full of water and then drained; the middle cultivation is 4 days after the early cultivation, the mixed nutrient water is injected into the field every 2 days until the cave is full of water and then drained, and this process is repeated for 2 times; the late cultivation is 6 days after the middle cultivation, the mixed nutrient water is injected into the field every 2-3 days until the cave is full of water and then drained, and this process is repeated for 3 times; the preparation and use process of the mixed nutrient water is as follows: floating animals are cultivated in a pool, 20 cubic meters of surface water under the middle light of the pool is extracted into a small pool at night 1 day before injection by using the phototaxis characteristics of floating animals; then 1.5 kg of dry yellow beans per mu of rice field is ground to make 15 liters of bean milk, the bean milk is added to the small pool and stirred evenly, and then the mixed nutrient water is injected into the field through a pipeline until the field surface is wet, and then the water in the field is drained.

[0040] The inducing out of the hole is that after the cave cultivation, water is injected into the field to a water depth of 25-30 cm, then 1.5 kg of compound feed per mu of rice field is fed to the parent shrimps and shrimplets every day for 5 consecutive days to induce the parent shrimps and shrimplets to come out of the hole.

[0041] The cage catching is that the next day after the inducing out of the hole, the parent shrimps and shrimplets are caught out of the hole every day until no shrimps are caught in the cage; the caught shrimplets are cultivated in a single pool according to the size or are harvested and sold, and the caught parent shrimps are concentrated for fattening and sold.

[0042] The feeding of the feed is that the next day after the parent shrimps are released, 2.5-3.0% of the body weight of the shrimps is fed with special compound feed every day once, and 2.0% of the weight of the daily feed is mixed with feed to take ionized calcium for one day every 10 days; the water quality control is that the water is changed once every 10 days, 20-30% of the field water is discharged first, then new water filtered by three layers of silk screen with mesh sizes of 20, 40 and 80 is injected to the original water level, and 4.0 kg of lime is mixed with water to uniformly spray on the whole field water surface per mu of rice field after the water injection; the daily management is that the feeding situation of the shrimplets and the change of the water quality are observed by more than one time of patrol every day, and problems are treated in time; the water depth of the field is maintained at 25-40 cm to prevent birds; and the feed feeding amount is adjusted or stopped according to the weather change.

[0043] Example 2

[0044] A method for cave cultivation of procambarus clarkia seedlings, comprising the following steps: selection of a rice field, planting of rice, preparation before releasing parent shrimps, releasing of parent shrimps, cultivation of parent shrimps, stress-induced hole digging and hole entering, field sunning, harvesting of rice, green recovery of rice stubble, cave cultivation, inducing out of the hole, and cage catching.

[0045] The selection of the rice field is to select a rice field with sufficient water source and convenient irrigation and drainage, and the relative two sides of the field have a height difference of 10-15 cm, the field ridge is reinforced and has a fence of iron sheet with a height of more than 40 cm above the top surface of the field ridge to prevent mice, frogs and snakes, and a 1 cm mesh polyethylene net is arranged around the field ridge to prevent the parent shrimps from digging holes and entering the hole.

[0046] The planting of the rice is to plant and manage the rice according to the season.

[0047] The preparation before releasing the parent shrimps is that in the middle and late July to August every year, when the seedlings of the second crop of rice or the green recovery of rice grow to more than 20 cm, water is injected into the field to a water depth of 10-15 cm, 7 kg of tea bran and 2.5 kg of lime are soaked for 4 days per mu of the field, and then the water body of the whole field is uniformly sprayed to kill fish and snails and completely clean the field.

[0048] The releasing of the parent shrimps is that 6 days after the complete cleaning of the field, when the water depth is more than 25 cm, the parent shrimps with ovary maturity of stage III are released with a female to male ratio of 1:1.

[0049] The said pro-pond culture is including feeding, water quality control and daily management.

[0050] The said stress tunneling and entering into the hole is that after the second crop of rice or the regenerative rice is filled in September to October every year, the male shrimps are captured and sold for 5 days, then the water is quickly drained to expose the field surface completely, and the pro-pond shrimps are forced to tunnel and enter into the hole.

[0051] The said field drying is that after the pro-pond shrimps tunnel and enter into the hole, the field water is drained, and the field is dried until the field surface is cracked with the crack being more than 0.5 cm.

[0052] The said rice harvesting is that after the field drying, the rice is harvested when 80-85% of the rice ears are mature.

[0053] The said rice stubble green-up is that after the rice is harvested, the water is injected into the field the next day to keep the field surface wet, and 45 kg of compound fertilizer is applied per mu every day, and the water is drained after the field surface is wetted, which is repeated for 3 days to keep the soil wet and promote the axillary bud germination; then the water is injected into the field to keep the water depth of 3-5 cm to promote the growth until the newly grown rice seedlings grow to more than 30 cm.

[0054] The said hole culture is divided into early culture, middle culture and late culture, the early culture is 6 days, the mixed nutrient water is injected into the field to feed the pro-pond shrimps and the shrimplets 35 days after the pro-pond shrimps tunnel and enter into the hole, the mixed nutrient water is injected into the field once a day until the hole is full of water and then the water is drained; the middle culture is 6 days after the early culture, the mixed nutrient water is injected into the field once every 2 days until the hole is full of water and then the water is drained, which is repeated for 2 times; the late culture is 9 days after the middle culture, the mixed nutrient water is injected into the field once every 3 days until the hole is full of water and then the water is drained, which is repeated for 3 times; the preparation and use process of the mixed nutrient water is as follows: the surface water of 25 cubic meters under the middle light of the pool is taken to a small pool at night one day before injection by using the phototaxis characteristics of the plankton; then 20 liters of soybean milk is prepared by grinding 2 kg of dry soybeans per mu of rice field, and the soybean milk is added to the small pool and stirred evenly, and then the mixed nutrient water is injected into the field through the pipeline until the field surface is wet, and then the water in the field is drained.

[0055] The said induced out of the hole is that after the hole culture, the water is injected into the field to keep the water depth of 25-30 cm, and then 1.8 kg of compound feed is fed per mu of rice field every day for 6 consecutive days to induce the pro-pond shrimps and the shrimplets to come out of the hole.

[0056] The said cage capture is that the next day after the induced out of the hole is finished, the pro-pond shrimps and the shrimplets are captured out of the hole every day until there is no shrimp into the cage; the captured shrimplets are cultured in a single pool according to the size or harvested and sold, and the captured pro-pond shrimps are concentrated for fattening and sold.

[0057] The feeding feed is 2.8% of the body weight of the parent shrimp on the day after the parent shrimp is released, and the parent shrimp is fed with special compound feed once a day, and 2.3% of the weight of the daily feeding feed is mixed with feed to take ionized calcium for one day every 13 days; the water quality control is to change water once every 13 days, and 20-30% of the field water is discharged first, and then new water filtered by 20, 40 and 80 mesh three-layer silk screen is injected to the original water level; after the water is injected, 4.5 kg of quicklime is used to mix water and uniformly sprinkle on the whole field water surface every mu of paddy field; the daily management is to patrol more than once a day to observe the feeding condition of the shrimp fry and the change of the water quality, and to treat the problems in time; the water depth of the field is kept at 25-40 cm to prevent birds; at the same time, the feeding amount is adjusted or the feeding is stopped according to the weather change.

[0058] Example 3

[0059] A method for cave cultivation of procambarus clarkia fry, comprising paddy field selection, rice planting, parent shrimp release preparation, parent shrimp release, parent shrimp cultivation, stress cave digging and cave entering, field drying, rice harvesting, rice stubble regreening, cave cultivation, induced cave exiting and cage catching.

[0060] The paddy field selection is to select a paddy field with sufficient water source and convenient irrigation and drainage, and the relative two sides of the field have a height difference of 10-15 cm, the field ridge is reinforced and has a mouse, frog and snake prevention iron sheet fence which is higher than the top of the field ridge by more than 40 cm, and a 1 cm mesh polyethylene net is surrounded along the inner side of the field ridge to prevent the parent shrimp from digging caves and entering the cave.

[0061] The rice planting is to plant rice and manage according to the season.

[0062] The parent shrimp release preparation is to soak the water in the field to a depth of 10-15 cm when the second crop of rice or the regreening rice seedlings grow to more than 20 cm in height in the middle and late July to August every year, and 7.5 kg of tea bran and 2.5 kg of quicklime are soaked for 5 days, and then the whole field water body is uniformly sprayed, and fish and snails are killed, and the field is thoroughly cleaned.

[0063] The parent shrimp release is to release parent shrimp with mature ovary of stage III when the water in the field is soaked to a depth of more than 25 cm after the field is thoroughly cleaned for 7 days, and the female to male ratio is 1:1.

[0064] The parent shrimp cultivation includes feeding feed, water quality control and daily management.

[0065] The stress cave digging and cave entering is to quickly drain the water to expose the field surface completely after the second crop of rice or the regreening rice is filled and the male shrimp is caught and sold for 5 days every year from September to October, and the parent shrimp is forced to dig caves and enter the cave.

[0066] The field drying is to drain the water in the field after the parent shrimp digs caves and enters the cave, and the field is dried until the field surface cracks with cracks of more than 0.5 cm.

[0067] The rice is harvested after the field is dried, and the rice is harvested when 80-85% of the rice spikes are mature.

[0068] The rice pile is green after the rice is harvested, and the next day, water is injected into the field to keep the field surface wet, and 50 kg of compound fertilizer is applied per mu, and the field surface is wetted once a day, and then the water is drained after the field surface is wet, for 3 consecutive days, to keep the soil moist and promote axillary bud germination; then water is injected into the field to a depth of 3-5 cm, and shallow water is maintained to promote growth until the newly grown rice seedlings grow to more than 30 cm.

[0069] The cave cultivation is divided into early cultivation, middle cultivation and late cultivation. The early cultivation is 6 days, and after the parent shrimp digs the cave and enters the cave for 40 days, mixed nutrient water is injected into the rice field for the parent shrimp and shrimp fry to feed, and the mixed nutrient water is injected once a day until the cave is full of water and then drained; the middle cultivation is 9 days after the early cultivation, and the mixed nutrient water is injected once every 3 days until the cave is full of water and then drained, and the injection is repeated for 3 times; the late cultivation is 12 days after the middle cultivation, and the mixed nutrient water is injected once every 3 days until the cave is full of water and then drained, and the injection is repeated for 4 times. The preparation and use process of the mixed nutrient water is as follows: floating animals are cultivated in a pool, 30 cubic meters of surface water under the middle light of the pool is extracted into a small pool at night one day before injection, taking advantage of the phototaxis characteristics of floating animals; then 3.0 kg of dry soybeans per mu of rice field is ground to make 30 liters of soy milk, and the soy milk is added to the small pool and stirred evenly, and then the soy milk is injected into the rice field through a pipeline until the field surface is wet, and then the water in the field is drained.

[0070] The induced out-of-cave is after the cave cultivation, water is injected into the field to a depth of 25-30 cm, and then 2.0 kg of compound feed per mu of rice field is fed every day for 7 consecutive days to induce the parent shrimp and shrimp fry to come out of the cave.

[0071] The cage capture is the next day after the induced out-of-cave ends, and the parent shrimp and shrimp fry that come out of the cave are captured in a cage every day until there are no shrimp in the cage; the captured shrimp fry is cultivated or harvested and sold according to specifications, and the captured parent shrimp is concentrated for fattening and sales.

[0072] The feed is fed the next day after the parent shrimp is released, and 3.0% of the shrimp body weight is fed with special compound feed once a day, and 2.5% of the daily feed weight is mixed with feed for 2 days to take ionized calcium orally; the water quality control is to change the water once every 10-15 days, and then inject new water filtered by 20, 40 and 80 mesh silk screens into the original water level after draining 20-30% of the field water; 5.0 kg of lime per mu of rice field is mixed with water and uniformly sprayed on the surface of the whole field after the water is injected; the daily management is to patrol more than once a day to observe the feeding situation of the shrimp fry and the change of the water quality, and to deal with problems in time; the water depth is maintained at 25-40 cm to prevent birds; at the same time, the feed feeding amount is adjusted or stopped according to the weather changes.

[0073] In the application production test process, it is found that the cave cultivation is the most key technology of the application technology. According to the incomplete statistics, in the same area of the breeding field, the same mixed nutrition water is used in different feeding ways, and the effects are different. The cave cultivation feeding way of the application of the galloping water type can reach more than 50 shrimplets per cave, and the feeding way without the galloping water type can reach less than 30 shrimplets per cave.

[0074] The above description is not a limitation of the application, and the application is not limited to the above examples. Within the scope of the application, changes, modifications, additions or replacements made by those skilled in the art should belong to the protection scope of the application.

Claims

1. A method for burrowing and cultivating Procambarus clarkii larvae, characterized in that: This includes paddy field selection, rice planting, preparation before releasing broodstock shrimp, broodstock shrimp release, broodstock shrimp cultivation, stressing shrimp to dig burrows, drying the paddy field, rice harvesting, rice stubble greening, burrow cultivation, inducing shrimp to emerge from their burrows, and trapping shrimp in cages. The rice paddies selected are those with abundant water sources and convenient irrigation and drainage. The rice paddies should have a height difference of 10-15 cm between the two sides of the paddy field. The paddy field ridges should be raised and reinforced, and there should be iron sheet fences that are more than 40 cm higher than the top of the paddy field ridges to prevent rats, frogs and snakes. A polyethylene net should be placed around the perimeter of the paddy field along the inner side of the ridges to prevent the parent shrimp from digging holes and entering the burrows. The rice cultivation described refers to planting and managing rice according to the season and conventional methods. The preparations for stocking broodstock shrimp are as follows: from mid-July to August each year, when the second crop of rice or regenerated rice seedlings grow to more than 20 cm, water is poured into the paddy field to a depth of 10-15 cm. For each acre of paddy field, 6.0-7.5 kg of tea seed cake and 2.0-2.5 kg of quicklime are soaked for 2-5 days, and then the solution is evenly sprinkled over the entire paddy field to kill fish and snails and thoroughly clean the field. The aforementioned broodstock stocking is carried out 5-7 days after the field is thoroughly cleared, and water is added to the field to a depth of more than 25 cm. Female broodstock shrimp with ovarian maturity stage III are then stocked, with a female-to-male ratio of 1:

1. The aforementioned broodstock shrimp cultivation includes feeding, water quality control, and daily management; The aforementioned coercion to burrow occurs annually in September or October, after the second crop of rice or ratooning rice has finished filling and the male shrimp have been caught in traps and sold 4-5 days later. The water level is then rapidly drained until the paddy field surface is completely exposed, thus coercing the parent shrimp to burrow. The aforementioned field drying process involves the parent shrimp digging burrows and draining the water from the field, then drying the field until the surface cracks, with cracks exceeding 0.5 cm. The rice harvesting mentioned above is carried out after the field has been dried, when 80-85% of the rice ears are mature. The aforementioned rice stubble greening process involves filling the field with water the day after rice harvest to keep the surface moist, applying 40-50 kg of compound fertilizer per acre, irrigating once a day until the surface is moist and then draining the water, continuing for 2-3 days to keep the soil moist and promote axillary bud germination; then filling the field with water to a depth of 3-5 cm, keeping the water shallow to promote growth until the new rice seedlings grow to more than 30 cm; The aforementioned burrow cultivation is divided into early cultivation, mid-stage cultivation, and late cultivation. Early cultivation lasts 5-6 days. After the parent shrimp have dug their burrows and entered the burrows for 30-40 days, mixed nutrient water is injected into the paddy field to provide food for the parent shrimp and shrimp larvae. Mixed nutrient water is injected once a day until the burrows are full, and then drained. Mid-stage cultivation lasts 4-9 days after early cultivation. Mixed nutrient water is injected every 2-3 days until the burrows are full, and then drained. This process is repeated 2-3 times. Late cultivation lasts 6-12 days after mid-stage cultivation. Mixed nutrient water is injected every 2-3 days until the burrows are full, and then drained. This process is repeated 3-4 times. The aforementioned induction of burrowing involves filling the paddy field with water to a depth of 25-30 cm after burrowing, and then feeding the paddy field with 1.5-2.0 kg of formulated feed per mu of paddy field daily for 5-7 consecutive days to induce the parent shrimp and shrimp larvae to emerge from their burrows. The trapping process involves trapping broodstock shrimp and shrimp larvae from their burrows the day after the burrowing process ends, continuing this process until no more shrimp are trapped. The trapped shrimp larvae are then categorized by size and raised in individual ponds or harvested for sale, while the trapped broodstock shrimp are raised and fattened in a centralized manner for sale. The feeding procedure involves administering a specialized formulated feed once daily, at a rate of 2.5-3.0% of the shrimp's body weight, the day after stocking the broodstock. Simultaneously, every 10-15 days, 2.0-2.5% of the daily feed weight is mixed with the feed and administered ionized calcium orally for 1-2 days. Water quality control involves changing the water every 10-15 days. During water changes, 20-30% of the paddy field water is drained, and then fresh water filtered through a three-layer sieve (20, 40, and 80 mesh) is added back to the original water level. After adding water, 4.0-5.0 kg of quicklime per acre of paddy field is diluted with water and evenly sprinkled across the entire surface. Daily management includes inspecting the paddy field at least once a day to observe the shrimp's feeding behavior and water quality changes, addressing any problems promptly. The water depth should be maintained at 25-40 cm to prevent bird damage. Feeding amounts should be adjusted or stopped depending on weather conditions. The process of preparing and using the mixed nutrient water is as follows: Zooplankton are cultivated in a pond. One night before irrigation, 20-30 cubic meters of surface water under the light in the middle of the pond is extracted into a small pond by taking advantage of the zooplankton's phototaxis. Then, 1.5-3.0 kg of dried soybeans are ground into 15-30 liters of soy milk per mu of paddy field each time. The soy milk is then added to the small pond and stirred evenly. The soy milk is then injected into the paddy field through pipes until the surface of the field is moistened. Finally, the water in the field is drained.

2. The method for burrowing and cultivating Procambarus clarkii larvae according to claim 1, characterized in that: The polyethylene mesh mentioned is a polyethylene mesh with a mesh size of 1 cm.