CN111758632B - Method for breeding and raising rice field crayfish in early autumn - Google Patents
Method for breeding and raising rice field crayfish in early autumn Download PDFInfo
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/50—Culture of aquatic animals of shellfish
- A01K61/59—Culture of aquatic animals of shellfish of crustaceans, e.g. lobsters or shrimps
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/20—Cereals
- A01G22/22—Rice
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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Abstract
The invention discloses a method for breeding and raising seedlings of crayfishes in rice fields in the early autumn, which improves the constitution of the crayfishes, improves the overwintering survival rate of the crayfishes, reduces the self-killing probability of the crayfishes and improves the specifications of the crayfishes by modifying the structure of the rice fields, building mating and spawning places for the crayfishes by leaving stubbles on the rice, inducing the crayfishes to mate and spawn by controlling the water level, setting barriers in a throwing area to optimize the parental crayfishes, feeding the parental crayfishes with feed, feeding the crayfishes with feed, catching the crayfishes, producing the crayfishes and the like, thereby obtaining the success of breeding and raising the ecological breeding of the crayfishes in the early autumn in the rice fields in the early autumn and realizing the large-scale and batch production of the crayfishes in the early autumn.
Description
Technical Field
The invention relates to the technical field of crayfish breeding seedlings, in particular to a method for breeding and raising rice field crayfish seedlings in early autumn.
Background
The procambarus clarkii belongs to the class of the arthrobacteria, the class of crustaceans, the family of crayfishes and the genus of procambarus clarkii, is also named as crayfish, is known as procambarus clarkii (hereinafter collectively named as crayfish), has delicious meat taste and rich nutrition, is deeply loved by people, and is a main variety for culturing the shrimps at present. In recent years, due to the rapid increase of market demand, the natural resources of crayfishes are rapidly reduced, and the price is gradually increased, so that the market demand is met through artificial scientific culture. The crayfish paddy field is bred and developed rapidly, and the seed becomes the bottleneck of crayfish aquaculture industry, and owing to crayfish breed biological characteristic, every group of parent shrimp embraces the ovum volume, arranges the seedling volume to be limited, generally between 100 ~ 300, although report that the crayfish is industrialized and is grown seedlings and is succeeded, but the needs of production have not been satisfied far away.
Disclosure of Invention
The invention aims to provide a method for breeding crayfish in a rice field in early autumn, which improves the constitution of the crayfish, improves the overwintering survival rate of the crayfish, reduces the self-killing probability of the crayfish fries, improves the specifications of the crayfish fries, has great significance for improving the unit breeding yield and the economic benefit of the rice field and solves the problems in the background technology by modifying the structure of the rice field, leaving stubbles of rice to create mating and spawning places for the crayfish, inducing the crayfish to mate to spawn by controlling the water level, setting barriers in a putting area to optimize the parental crayfish, feeding parent crayfish feed, feeding offspring feed, catching the offspring, improving the yield and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for breeding and raising rice field crayfish seedlings in early autumn comprises the following steps:
s1: modifying a deep water area of a rice field for breeding seedlings in early autumn;
s2: bottom micropore oxygenation equipment is arranged in a deep water area, and the cultivation of crayfish parents is enhanced in the rice growth period, so that the crayfish parents are promoted to reach sexual maturity in advance;
s3: selecting a rice variety with short whole growth period, harvesting the rice in the last 9 th month, and realizing early autumn propagation of crayfish seedlings;
s4: setting a crayfish parent transition breeding pond, preferably selecting a parent crayfish, and continuously improving the growth speed and disease resistance of the fries;
s5: developing a feed formula for promoting the gonad development of parent shrimps, and feeding the parent shrimps with the feed for the gonad development, so that the egg laying rate of the parent shrimps of the crayfish is improved by more than 15%;
s6: the natural bait of the crayfish fries is combined with the artificial feeding feed;
s7: the one-year rice field realizes the large-scale batch production of the seedlings on the basis of planting the rice in one season, and the fishing time of the seedlings is 11 months in the current year and 4 months in the next year.
Further, the specific method in S1 is: except the surrounding circular ditches of each rice field, a deep water area is additionally arranged in the middle of each rice field, and an early-autumn seedling propagation deep water area with the area of 60m is constructed in the middle of each rice field every 50 meters along the length direction of each rice field2～100m2Length-width ratio of 4: 1, water depth of more than 1.5m, gradient of 1: 3; 10 early autumn seedling breeding deep water areas are arranged per 10 mu, and human places for parent shrimps to inhabit, dig holes and hold eggs are increased.
Further, the specific method in S2 is: set up bottom micropore oxygenation equipment in paddy field deep water district, the diameter that the installation pipe diameter was made for 2 centimetres PV hose is one for 0.5 meter inflatable disk, and every inflatable disk links to each other with the bleed pipe of 5 centimetres of pipe diameters with corresponding interface, and the bleed pipe is used corresponding interface and air compressor to link to each other, and inflatable disk is fixed with steel wire and fragment of brick, according to the supporting 0.15 ~ 0.2kw of per mu micropore pipe aerator power, the supporting 1 of 2 kilowatt air compressor of per 50 mu paddy field areas.
Further, the specific method in S3 is as follows:
s301: dynamically regulating water level around rice production, regulating a crayfish breeding process through water level control, starting to sun dry the rice field for the second time 35 days before harvesting the rice, quickly reducing the water level of the rice field plate surface to 10cm, slowly discharging water, namely controlling the water level of the rice field plate surface to be about 72 hours to enable the rice field plate surface to be completely exposed out of the water surface when the water level of the rice field plate surface reaches 10cm, and then exposing the rice field plate surface to sun until the field surface cracks to induce the crayfish to dig into a hole for mating and spawning;
s302: after the rice is harvested for 15 days, water is added, after 30 days, the water level of the plate surface reaches 30-40 cm, and the water level of the plate surface is controlled to be 40-42 cm from 11 months to 3 months in the next year; the water level control technology ensures that the water level of the rice field does not submerge the top of the rice stubble all the time from 10 months to 3 months in the next year after the rice is harvested, the straw of the rice stubble is green, the physiological activity is kept, oxygen in the air is utilized through the breathing channel of the straw, the straw stands upright in the water all the time, the water temperature of the rice field is kept stable in the winter passing period, and the crayfish parents and the crayfish fries can successfully live through the winter; keeping the water temperature in the wintering period, and fertilizing the water quality in the spring of the next year to provide natural bait;
s303: controlling the water level of the rice field plate surface at 40cm in 3 months; after 4 ten days in the second year, the water level of the rice field surface is increased to 50-60 cm to submerge rice stubbles, so that the rice stubbles are decomposed to fertilize the water quality;
s304: keeping the water level of the surface of the paddy field to be 5cm in the last ten days of 6 months, keeping the water level of the surface of the paddy field to be 0cm in the middle ten days of 6 months when the paddy field is dried in the sun, keeping the water level of the circumferential furrow to be 5cm lower than the surface of the paddy field, and adding the water level of the surface of the paddy field to 30-45 cm from 7 months to 9 months after the first time of drying in the sun; and (3) drying the field again before harvesting, hardening the surface of the field, lowering the water level of the circular groove to be 10cm lower than the surface of the field in 10 months, enabling the gonad of the crayfish parent to mature at the moment, harvesting the rice and drying the field to induce the crayfish to mate and lay eggs.
Further, the specific method in S4 is: dividing the crayfish parent breeding ponds into 5 parts, wherein each breeding pond is separated by a smooth double-layer plastic film, a layer of polyethylene net sheet is arranged between the double-layer plastic films, and the height of the exposed water surface is 30 cm; placing female crayfish in the middle zone and male crayfish parents in the other 4 zones; and (3) selecting male shrimps by attracting the female shrimps for 3-5 days, wherein the male parent shrimps which can pass through the film and enter the female crayfish parent region are selected as breeding shrimps.
Further, the specific method in S5 is: the special granulated feed for promoting the gonad development of the parent shrimps is supplemented and fed to the parent shrimps, so that the egg holding amount of the parent shrimps is increased: the parent shrimps mainly comprise organic debris, zooplankton, aquatic insects, periphyton and natural bait of aquatic weeds in the rice field, the granular feed is fed in a supplementing way in 7-10 months and 3 months next year, the feeding is carried out for 1 time at 16: 00-17: 00 every day, and the feeding amount accounts for 2% -3% of the total weight of the shrimps.
Further, the parent shrimp gonad development pellet feed formula is as follows: 15% of dry earthworms, 10% of pig blood powder, 10% of freshwater mussel, 10% of sheep liver, 18% of dried pseudorasbora parva, 23% of wheat flour, 3% of selenium-rich pueraria lobata powder, 2% of starch, 2% of barnyard grass seed powder, 2% of verbena powder, 1% of barley seed powder, 1% of wheat malt, 1% of sage seed powder, 1% of leek seed powder and 1% of yeast; the artificial granulated feed is prepared according to the formula.
Further, the specific method in S6 is: feeding the rice according to the amount of natural baits in the rice field from 10 months in the current year to 4 months and later in the next year, wherein the feeding is performed every 667m2The feeding amount is 1.1 kg-2.0 kg; feeding for 1 time at a ratio of 16: 00-17: 00 every day, wherein the feed mainly comprises granulated feed.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for breeding the crayfish in the rice field in the early autumn, provided by the invention, the steps of modifying the structure of the rice field, keeping the stubble of the rice to create a mating and spawning place for the crayfish, inducing the crayfish to mate and spawn by water level control, setting obstacles in a throwing area to preferably select the parental crayfish, feeding the parental crayfish with feed, feeding the fry with feed, catching the fry, producing the yield and the like are adopted to achieve the purposes of enhancing the physique of the crayfish, improving the overwintering survival rate of the crayfish, reducing the self-killing probability of the crayfish fry and improving the specification of the crayfish fry, so that the success of breeding the crayfish in the early autumn in the rice field in the early autumn is achieved, and the large-scale and batch production of the crayfish breeding fry in the early autumn is realized.
Drawings
FIG. 1 is a schematic view of a deep water region for raising crayfish seedlings in a paddy field according to the present invention;
FIG. 2 is a schematic diagram of a crayfish parent breeding pond of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the invention: provides a method for breeding and raising rice field crayfish in early autumn, which comprises the following steps:
the first step is as follows: modifying a deep water area of a rice field for breeding seedlings in early autumn; wherein, except the circumferential circular ditches of each rice field, a deep water area is additionally arranged in the middle of the rice field, and an early autumn seedling propagation deep water area with the area of 60m is constructed in the middle of the rice field every 50 meters along the length direction of the rice field2～100m2Length-width ratio of 4: 1, water depth of more than 1.5m, gradient of 1: 3; the method is characterized in that 10 early-autumn seedling breeding deep-water areas are arranged per 10 mu, and human places for parental shrimps to inhabit, dig holes and hold eggs are increased, as shown in figure 1.
The second step is that: bottom micropore oxygenation equipment is arranged in a deep water area, and the cultivation of crayfish parents is enhanced in the rice growth period, so that the crayfish parents are promoted to reach sexual maturity in advance; the specific method comprises the following steps: set up bottom micropore oxygen equipments in paddy field deep water district, the diameter that installation pipe diameter was made for 2 centimetres (every interval 1 meter is equipped with the little gas pocket of diameter 2.5 millimeters) PV hose is one for 0.5 meter inflation dish, every inflation dish links to each other with the bleed pipe of pipe diameter 5 centimetres with corresponding interface, the bleed pipe is with corresponding interface and air compressor link to each other, it is fixed with steel wire and fragment of brick to inflate the dish, it floats to inflate the dish when both having avoided aerifing, can prevent to inflate the dish and sink into the bed mud again, cause and inflate the hole and block up, according to the supporting 0.15 ~ 0.2kw of per mu micropore pipe oxygen-increasing machine power, 1 supporting 2 kilowatt air compressor per 50 mu of paddy field area.
The third step: selecting a rice variety with short whole growth period, harvesting the rice in the last 9 th month, and realizing early autumn propagation of crayfish seedlings; the method specifically comprises the following steps:
1. dynamically regulating water level around rice production, and utilizing mechanized harvesting of rice to secondary roasting to induce crayfish to dig holes for mating and spawning;
2. through the water level control regulation crayfish process of breeding, 35 days before the rice is reaped begin to dry in the sun the field and induce crayfish mating and lay eggs, 15 days after reaping begin to add water and induce crayfish seed to concentrate out the hole:
3. the second drying of the field is started 35 days before the rice is harvested, the water level of the plate surface of the rice field is quickly reduced to 10cm, then water is slowly drained, namely when the water level of the plate surface of the rice field reaches 10cm, the time is controlled to be about 72 hours, the plate surface of the rice field is completely exposed out of the water surface, and then the field is exposed to the sun until the dry crack of the field surface induces the crayfishes to dig holes for mating and spawning;
4. adding water after harvesting for 15 days, controlling the water level of the board surface to be 30-40 cm after 30 days, and controlling the water level of the board surface to be 40-42 cm from 11 months to 3 months in the next year; the water level control technology ensures that the water level of the rice field does not submerge the top of the rice stubble all the time from 10 months to 3 months in the next year after the rice is harvested, the straw of the rice stubble is green, the physiological activity is kept, oxygen in the air is utilized through the breathing channel of the straw, the straw stands upright in the water all the time, the water temperature of the rice field is kept stable in the winter passing period, and the crayfish parents and the crayfish fries can successfully live through the winter; keeping the water temperature in the wintering period, and fertilizing the water quality in the spring of the next year to provide natural bait;
5. controlling the water level of the rice field plate surface in 3 months to be about 40 cm; after 4 ten days in the second year, the water level of the rice field surface is increased to 50-60 cm to submerge rice stubbles, so that the rice stubbles are decomposed to fertilize the water quality;
6. the rice stubble plays multiple roles, firstly, the rice stubble provides inhabitation and hidden places for parent shrimps, juvenile shrimps and the like, mutual residual food is reduced, the survival rate of the juvenile shrimps is obviously improved, secondly, natural bait is provided for the parent shrimps and the juvenile shrimps, thirdly, the water temperature can be kept during the overwintering period, and the smooth overwintering of the crayfishes is facilitated; fourthly, oxygen in the air is utilized through the breathing channel of the straws, so that the survival rate of the crayfish fries in overwintering is improved; fifthly, decomposing rice stubbles to fertilize water quality in 4-5 months in the next year to provide natural bait for crayfishes;
7. keeping the water level of the field surface about 5cm during the seedling transplanting in the last ten days of 6 months; when the field is dried in the middle ten days of 6 months, the water level of the surface of the rice field is kept at 0cm, the water level of the circular ditch is about 5cm lower than the surface of the field, and the water level of the surface of the rice field is increased to 30-45 cm from 7 months to 9 months after the field is dried for the first time; and (3) drying the field again before harvesting, hardening the surface of the field, lowering the water level of the circular groove to be about 10cm lower than the field surface in 10 months, enabling the gonad of the crayfish parent to mature at the moment, harvesting the rice and drying the field to induce the crayfish to mate and lay eggs.
The fourth step: setting a crayfish parent transition breeding pond, preferably selecting a parent crayfish, and continuously improving the growth speed and disease resistance of the fries; referring to fig. 2 specifically, the crayfish parent breeding pond is divided into 5 parts, each part is separated by a smooth double-layer plastic film, a layer of polyethylene net sheet is arranged between the double-layer plastic films, and the height of the exposed water surface is about 30 cm; placing female crayfish in the middle zone and male crayfish parents in the other 4 zones; and (3) selecting male shrimps by attracting the female shrimps for 3-5 days, wherein the male parent shrimps which can pass through the film and enter the female crayfish parent region are selected as breeding shrimps.
The fifth step: developing a feed formula for promoting the gonad development of parent shrimps, and feeding the parent shrimps with the feed for the gonad development, so that the egg laying rate of the parent shrimps of the crayfish is improved by more than 15%; wherein the parent shrimps mainly use natural baits such as organic debris, zooplankton, aquatic insects, periphyton, water plants and the like in the rice field, the granular feed is fed in a supplementing way in 7-10 months and 3 months next year, the feeding is carried out for 1 time at 16: 00-17: 00 every day, and the feeding amount accounts for 2% -3% of the total weight of the shrimps;
the parent shrimp gonad development feed formula comprises: 15% of dry earthworms, 10% of pig blood powder, 10% of freshwater mussel, 10% of sheep liver, 18% of dried pseudorasbora parva, 23% of wheat flour, 3% of selenium-rich pueraria lobata powder, 2% of starch, 2% of barnyard grass seed powder, 2% of verbena powder, 1% of barley seed powder, 1% of wheat malt, 1% of sage seed powder, 1% of leek seed powder and 1% of yeast; the artificial granulated feed is prepared according to the formula.
And a sixth step: the natural bait and the artificial feeding feed for the crayfish fries are combined: feeding the rice according to the amount of natural baits in the rice field from 10 months in the current year to 4 months and later in the next year, wherein the feeding is performed every 667m2The feeding amount is 1.1 kg-2.0 kg; feeding for 1 time at a ratio of 16: 00-17: 00 every day, wherein the feed mainly comprises granulated feed.
The seventh step: the large-scale batch production of the seedlings is realized on the basis of planting the rice in one season in the rice field with one rice slice.
In order to further explain the invention better, the following specific cases are also provided:
selecting 6 smooth rectangular rice fields with good ecological environment and no pollution source in county and county areas, wherein the length-width ratio of the rice fields is 2: 1, about 15 mu per paddy field, and culturing according to the method from the first step to the seventh step (not described herein), wherein the capturing time of the seedlings is 11 months in the current year and 4 months in the next year, and the average yield of the crayfish seedlings in the paddy field cultured by the method reaches 10.5 ten thousand tails/667 m212.5 thousand tails/667 m2In the meantime.
It can be seen from this that: according to the method for breeding the crayfish in the rice field in the early autumn, provided by the invention, the steps of modifying the structure of the rice field, keeping the stubble of the rice to create a mating and spawning place for the crayfish, inducing the crayfish to mate and spawn by water level control, setting obstacles in a throwing area to preferably select the parental crayfish, feeding the parental crayfish with feed, feeding the fry with feed, catching the fry, producing the yield and the like are adopted to achieve the purposes of enhancing the physique of the crayfish, improving the overwintering survival rate of the crayfish, reducing the self-killing probability of the crayfish fry and improving the specification of the crayfish fry, so that the success of breeding the crayfish in the early autumn in the rice field in the early autumn is achieved, and the large-scale and batch production of the crayfish breeding fry in the early autumn is realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (5)
1. A method for breeding and raising rice field crayfish seedlings in early autumn is characterized by comprising the following steps:
s1: modifying a deep water area of a rice field for breeding seedlings in early autumn; the specific method comprises the following steps: except the circumferential circular ditches of each rice field, a deep water area is additionally arranged in the middle of each rice field, and an early-autumn seedling propagation deep water area with the area of 60m is constructed in the middle of each rice field every 50 meters along the length direction of each rice field2～100 m2Length-width ratio of 4: 1, water depth of more than 1.5m, gradient of 1: 3; setting 10 early-autumn seedling propagation deep-water areas per 10 mu for configuration, and increasing the human places where the parent shrimps inhabit, dig holes and hold eggs;
s2: bottom micropore oxygenation equipment is arranged in a deep water area, and the cultivation of crayfish parents is enhanced in the rice growth period, so that the crayfish parents are promoted to reach sexual maturity in advance; the specific method comprises the following steps: arranging bottom micropore oxygenation equipment in a deep water area of a rice field, installing one air inflation disc with the diameter of 0.5 meter and made of a PV hose with the pipe diameter of 2 centimeters, connecting each air inflation disc with an air guide pipe with the pipe diameter of 5 centimeters through a corresponding interface, connecting the air guide pipe with an air compressor through the corresponding interface, fixing the air inflation discs through steel wires and bricks, and matching the power of the aerator with 0.15-0.2 kw per mu of micropore pipes, and matching 12 kilowatt air compressor per 50 mu of rice field area;
s3: selecting a rice variety with short whole growth period, and harvesting the rice in the last 9 th month to realize the early autumn propagation of the crayfish fries;
s4: setting a transitional breeding pond for the crayfish parents, selecting the parents of the crayfish, and continuously improving the growth speed and the disease resistance of the fries; the specific method comprises the following steps: dividing the crayfish parent breeding ponds into 5 parts, wherein each breeding pond is separated by a smooth double-layer plastic film, a layer of polyethylene net sheet is arranged between the double-layer plastic films, and the height of the exposed water surface is 30 cm; placing female crayfish in the middle zone and male crayfish parents in the other 4 zones; selecting male parent shrimps which can enter a female crayfish parent region by a female shrimp attracting male shrimps for 3-5 days as breeding shrimps;
s5: developing a feed formula for promoting the gonad development of parent shrimps, and feeding the parent shrimps with the feed for the gonad development, so that the egg laying rate of the parent shrimps of the crayfish is improved by more than 15%;
s6: the natural bait of the crayfish fries is combined with the artificial feeding feed;
s7: the one-year rice field realizes the large-scale batch production of the seedlings on the basis of planting the rice in one season, and the fishing time of the seedlings is 11 months in the current year and 4 months in the next year.
2. The method for breeding and raising seedlings of crayfish in rice field in early autumn as claimed in claim 1, wherein the specific method in S3 is as follows:
s301: dynamically regulating water level around rice production, regulating a crayfish breeding process through water level control, starting to sun dry the rice field for the second time 35 days before harvesting the rice, quickly reducing the water level of the rice field plate surface to 10cm, slowly discharging water, namely controlling the water level of the rice field plate surface to be about 72 hours to enable the rice field plate surface to be completely exposed out of the water surface when the water level of the rice field plate surface reaches 10cm, and then exposing the rice field plate surface to sun until the field surface cracks to induce the crayfish to dig into a hole for mating and spawning;
s302: after the rice is harvested for 15 days, water is added, after 30 days, the water level of the plate surface reaches 30-40 cm, and the water level of the plate surface is controlled to be 40-42 cm from 11 months to 3 months in the next year; the water level control technology ensures that the water level of the rice field does not submerge the top of the rice stubble all the time from 10 months to 3 months in the next year after the rice is harvested, the straw of the rice stubble is green, the physiological activity is kept, oxygen in the air is utilized through the breathing channel of the straw, the straw stands upright in the water all the time, the water temperature of the rice field is kept stable in the winter passing period, and the crayfish parents and the crayfish fries can successfully live through the winter; keeping the water temperature in the wintering period, and fertilizing the water quality in the spring of the next year to provide natural bait;
s303: controlling the water level of the rice field plate surface at 40cm in 3 months; after 4 ten days in the second year, the water level of the rice field surface is increased to 50-60 cm to submerge rice stubbles, so that the rice stubbles are decomposed to fertilize the water quality;
s304: keeping the water level of the surface of the paddy field to be 5cm in the last ten days of 6 months, keeping the water level of the surface of the paddy field to be 0cm in the middle ten days of 6 months when the paddy field is dried in the sun, keeping the water level of the circumferential furrow to be 5cm lower than the surface of the paddy field, and adding the water level of the surface of the paddy field to 30-45 cm from 7 months to 9 months after the first time of drying in the sun; and (3) drying the field again before harvesting, hardening the surface of the field, lowering the water level of the circular groove to be 10cm lower than the surface of the field in 10 months, enabling the gonad of the crayfish parent to mature at the moment, harvesting the rice and drying the field to induce the crayfish to mate and lay eggs.
3. The method for breeding and raising seedlings of crayfish in rice field in early autumn as claimed in claim 1, wherein the specific method in S5 is as follows: the special granulated feed for promoting the gonad development of the parent shrimps is supplemented and fed to the parent shrimps, so that the egg holding amount of the parent shrimps is increased: the parent shrimps mainly comprise organic debris, zooplankton, aquatic insects, periphyton and natural bait of aquatic weeds in the rice field, the granular feed is fed in a supplementing way in 7-10 months and 3 months next year, the feeding is carried out for 1 time at 16: 00-17: 00 every day, and the feeding amount accounts for 2% -3% of the total weight of the shrimps.
4. The method for breeding the rice field crayfish in the early autumn as claimed in claim 3, wherein the formula of the granulated feed for the gonad development of the parent crayfish is as follows: 15% of dry earthworms, 10% of pig blood powder, 10% of freshwater mussel, 10% of sheep liver, 18% of dried pseudorasbora parva, 23% of wheat flour, 3% of selenium-rich pueraria lobata powder, 2% of starch, 2% of barnyard grass seed powder, 2% of verbena powder, 1% of barley seed powder, 1% of wheat malt, 1% of sage seed powder, 1% of leek seed powder and 1% of yeast; the artificial granulated feed is prepared according to the formula.
5. The method for breeding and raising seedlings of crayfish in rice field in early autumn as claimed in claim 1, wherein the specific method in S6 is as follows: feeding the rice according to the amount of natural baits in the rice field from 10 months in the current year to 4 months and later in the next year, wherein the feeding is performed every 667m2The feeding amount is 1.1 kg-2.0 kg; feeding for 1 time at a ratio of 16: 00-17: 00 every day, wherein the feed mainly comprises granulated feed.
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| CN113080116A (en) * | 2021-03-16 | 2021-07-09 | 安徽省农业科学院水产研究所 | Staged breeding method for shrimp larvae in paddy field |
| CN113557997B (en) * | 2021-07-09 | 2022-09-13 | 安徽沃土稻虾养殖专业合作社 | Batch ecological breeding method for paddy field crayfishes without circular ditches |
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