CN112544515B - Method for overwintering procambarus clarkii parents in outdoor pond under ice - Google Patents

Method for overwintering procambarus clarkii parents in outdoor pond under ice Download PDF

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CN112544515B
CN112544515B CN202011418021.7A CN202011418021A CN112544515B CN 112544515 B CN112544515 B CN 112544515B CN 202011418021 A CN202011418021 A CN 202011418021A CN 112544515 B CN112544515 B CN 112544515B
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overwintering
pond
ice
water
procambarus clarkii
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CN112544515A (en
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张希
邹作宇
杨洁
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Harbin Academy of Agricultural Sciences
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Harbin Academy of Agricultural Sciences
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00Culture of aquatic animals
    • A01K61/50Culture of aquatic animals of shellfish
    • A01K61/59Culture of aquatic animals of shellfish of crustaceans, e.g. lobsters or shrimps
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

Abstract

The invention discloses an ice overwintering method for an outdoor pond of a cold area of a parent of procambarus clarkii, and relates to an ice overwintering method for an outdoor pond of a cold area of a parent of procambarus clarkii. The invention aims to solve the problem of low survival rate of procambarus clarkii overwintering in alpine regions under ice. The method comprises the following steps: selecting and transforming a pond before overwintering, setting escape-proof facilities, stocking overwintering parent shrimps, managing the change of a culture water level and an ice layer during the overwintering period, and managing the daily management of the overwintering period. The invention utilizes the position of the escape-proof facility to combine with the change of the culture water level in different periods, ensures that the parent shrimps are in the unfrozen soil layer and the unfrozen culture water area during the initial water injection of the secondary ice seal, ensures that the overwintering parent shrimps move in the water area below the ice layer of the pond in the whole overwintering period, ensures the basic survival temperature of the procambarus clarkii, improves the overwintering survival rate, has the characteristics of simple operation, low cost, high overwintering survival rate and the like, and is particularly suitable for the overwintering breed conservation work of the procambarus clarkii production in the alpine region.

Description

Method for overwintering procambarus clarkii parents in outdoor pond under ice
Technical Field
The invention relates to an ice overwintering method for an outdoor pond of a parent cold region of procambarus clarkii.
Background
Procambarus clarkii (Procambarus clarkii) is commonly called crayfish, belonging to Crustacea, Octagetales, Cratadaceae, Procambarus, and is native to North America. The 20 th century and the 30 th century enter the Yangtze river basin of China through Japan and become important freshwater shrimp breeding varieties in China, the Procambrus clarkii industry grows explosively, a huge Procambrus clarkii breeding industry is formed domestically, artificial breeding of the Procambrus clarkii is developed in multiple provinces according to local conditions, but the provinces capable of realizing large-scale centralized breeding are not many. The procambarus clarkii is taken as a most potential characteristic aquaculture variety, and the wide prospect of artificial breeding of the procambarus clarkii is promoted by the demand of the northern market under the condition that the consumption market is continuously heated.
The freshwater procambarus clarkia has strong adaptability to the environment, can survive in a water body with the pH value of 5.8-8.2 and the dissolved oxygen of not less than 1.5mg/L, and has the adaptive temperature of 0-35 ℃. The procambarus clarkii has the characteristics of fast growth and strong environment adaptability, and higher economic value can be obtained by transplanting, breeding and breeding in northern areas. At present, the introduction and breeding work of procambarus clarkii has been carried out in a plurality of places in Heilongjiang province, a small-scale artificial breeding demonstration is carried out, and along with the gradual exploration of the mature trend of the artificial breeding technology in the north, the safe overwintering technology of procambarus clarkii parents in cold winter under ice needs to be solved urgently.
After the ice is sealed in the alpine region in winter, the water temperature of the unfrozen layer can be kept at 4 ℃ generally, and feasibility is provided for the procambarus clarkii to overwinter in winter under ice, but the life habit of digging a tunnel of the procambarus clarkii increases the risk of the procambarus clarkii freezing in the ice layer and soil in the ice sealing period, so that the survival rate of the procambarus clarkii overwinter under ice is extremely low, and the breeding production of the procambarus clarkii in the alpine region is limited. Meanwhile, due to the particularity of ice-sealing overwintering, the conditions of the overwintering pond, including the thickness of an ice layer, the water level of an unfrozen layer, the illuminance under ice, the dissolved oxygen, the substrate, the organisms and the like, have different influences on the overwintering effect.
Disclosure of Invention
The invention provides an under-ice overwintering method for an outdoor pond of a procambarus clarkii parent cold area, aiming at solving the problem of low survival rate of the procambarus clarkii in the alpine area during the under-ice overwintering.
The method for the iced overwintering of the outdoor pond of the parent procambarus clarkii in the cold area comprises the following steps:
firstly, selecting an overwintering pond with the length-width ratio of (3-4) to 1 and the slope ratio of 1: 3;
secondly, injecting underground water into the overwintering pond 15 days before releasing the shrimps, wherein the water depth in the overwintering pond after water injection is 1-1.2 m;
thirdly, cleaning the pond by using quicklime, and then using B-type peptide fertilizer and fertilizer water, wherein the transparency of the overwintering pond is controlled to be 28-30 cm; the amount of the quicklime is 100-150 kg/mu per 1m of water depth, and the amount of the B-type peptide fertilizer is 2-3 kg/mu per 1m of water depth;
fourthly, when the pH value of pond water in the overwintering pond is 8.0-8.3, transplanting the waterweeds into the overwintering pond, and placing honeycomb-shaped pvc shrimp nests in a deep water area of the overwintering pond; the coverage rate of the waterweeds is 30-50%;
fifthly, arranging a first escape-proof net at the position, 1-1.2 m away from the highest water level line, of the periphery of the pond stalk of the overwintering pond, and taking the first escape-proof net as a first underwater protective measure; arranging a second escape-proof net on the dam of the overwintering pond to serve as a second land escape-proof facility;
sixthly, putting healthy procambarus clarkia parents with the individual length of 8-12 cm into a pond in a sunny and warm weather, wherein the stocking density is 25-80 kg/mu, the male-female ratio is 2:1, and the anti-stress Vc is sprayed to 250-500 g/mu at the same time;
seventhly, determining daily feeding amount according to the water temperature and weather changes, and finishing feeding work before overwintering;
eighthly, carrying out secondary water injection to the overwintering pond to the depth of 2.2-2.5 m at the initial stage of ice sealing;
constantly and regularly patrolling the pond during the ice-sealing period of overwintering, well managing during the overwintering period, regularly removing snow to keep the transmittance of an ice layer to be 50-80cm, and ensuring that the dissolved oxygen under ice is not less than 5 mg/L;
and ten days or 4 months and the middle ten days in the next year, completing the outdoor ice-water overwintering of the pond of the procambarus clarkii parents in the cold area.
The invention has the beneficial effects that:
the invention has simple operation and low cost, and is suitable for popularization and application. By the method, the parent of the procambarus clarkii has high overwintering survival rate because the procambarus clarkii is not influenced by a high-thickness ice layer. In Harbin and Jiamusi breeding bases in Heilongjiang province, the method is adopted to overwinter under ice in winter in 10 months to 4 months in the next year, and statistical results show that the overwinter survival rate of the method reaches 60% -80%, but the overwinter survival rate without the method is less than 2%.
Drawings
FIG. 1 is a schematic structural diagram of an overwintering pond in an embodiment; wherein 1 is a first escape-proof net, 2 is a second escape-proof net, 3 is a pool ridge, 4 is the position of a first water injection water level line at the initial stage of ice sealing, 5 is the position of a second water injection water level line at the initial stage of ice sealing, 6 is an ice layer, and 7 is a water area below the ice layer;
FIG. 2 is a schematic structural view of a first anti-escape net; wherein 8 is a polyethylene mesh sheet, and 9 is a black plastic film.
Detailed Description
The first embodiment is as follows: the method for the freshwater crayfish parent outdoor pond overwintering under the ice in the cold area specifically comprises the following steps:
firstly, selecting an overwintering pond with the length-width ratio of (3-4) to 1 and the slope ratio of 1: 3;
secondly, injecting underground water into the overwintering pond 15 days before releasing the shrimps, wherein the water depth in the overwintering pond after water injection is 1-1.2 m;
thirdly, cleaning the pond by using quicklime, and then using B-type peptide fertilizer and fertilizer water, wherein the transparency of the overwintering pond is controlled to be 28-30 cm; the amount of the quicklime is 100-150 kg/mu per 1m of water depth, and the amount of the B-type peptide fertilizer is 2-3 kg/mu per 1m of water depth;
fourthly, when the pH value of pond water in the overwintering pond is 8.0-8.3, transplanting the waterweeds into the overwintering pond, and placing honeycomb-shaped pvc shrimp nests in a deep water area of the overwintering pond; the coverage rate of the waterweeds is 30-50%;
fifthly, arranging a first escape-proof net at the position, 1-1.2 m away from the highest water level line, of the periphery of the pond stalk of the overwintering pond, and taking the first escape-proof net as a first underwater protective measure; arranging a second escape-proof net on the dam of the overwintering pond to serve as a second land escape-proof facility;
putting healthy procambarus clarkii parents with the individual length of 8-12 cm into a pond in a sunny and warm weather, wherein the stocking density is 25-80 kg/mu, the male-female ratio is 2:1, and the anti-stress Vc is sprayed to 250-500 g/mu at the same time;
seventhly, determining daily feeding amount according to the water temperature and weather changes, and finishing feeding work before overwintering;
eighthly, carrying out secondary water injection to the overwintering pond to the depth of 2.2-2.5 m at the initial stage of ice sealing;
constantly and regularly patrolling the pond during the ice-sealing period of overwintering, well managing during the overwintering period, regularly removing snow to keep the transmittance of an ice layer to be 50-80cm, and ensuring that the dissolved oxygen under ice is not less than 5 mg/L;
and ten days or 4 months and the middle ten days in the next year, completing the outdoor ice-water overwintering of the pond of the procambarus clarkii parents in the cold area.
In the embodiment, the water depth of the deep water area after the overwintering pond stores water is more than 2.5m, and the water depth of the shallow water area is 1.8-2.5 m.
The underground water has good water quality, no pollution and sufficient water source.
In the embodiment, the overwintering parent shrimps need to select individuals with complete appendages, no physical injury, no physical disability and strong physique.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in the step one, the area of the overwintering pond is 10-15 mu, and the unfrozen water layer after ice sealing is not less than 1.2-1.5 m. The rest is the same as the first embodiment.
The overwintering pond of the embodiment has no water leakage.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: in the fourth step, the specification of the honeycomb-shaped pvc shrimp nests is 100cm multiplied by 30cm multiplied by 9cm, and the honeycomb-shaped pvc shrimp nests are placed according to the number of 25-50 per mu. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: in the fourth step, the honeycomb-shaped pvc shrimp nest is formed by assembling two rectangular single-sheet pvc plates with M-shaped cross sections, wherein the avoiding holes are hexagonal holes with the diameter of 6cm and the length of 20 cm. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode is as follows: the difference between this embodiment and one of the first to fourth embodiments is: and in the fifth step, the first escape-proof net is formed by connecting a black plastic film with the width of 20cm and a polyethylene net piece with the mesh size of 6mm, the black plastic film is sewn at the top end of the inner side of the polyethylene net piece, the height of the polyethylene net piece is 120cm, the polyethylene net piece is vertically buried under the ground for 20-30 cm, the included angle between the polyethylene net piece and the horizontal plane is 60-90 degrees, and the polyethylene net piece is fixed by adopting a wooden stick or a bamboo rod binding line with the height of 120 cm. The rest is the same as one of the first to fourth embodiments.
The embodiment can effectively prevent the pond shrimps from entering the ice sealing water area to move and dig the tunnel before ice sealing, so that the pond shrimps are prevented from being frozen in the ice layer when overwintering in winter.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: and in the fifth step, the height of the second escape-proof net is 30-40 cm, the second escape-proof net is formed by connecting two parts of a black plastic film with the width of 5cm and a polyethylene net piece with the mesh size of 6mm together, the polyethylene net piece is vertically buried under the ground for 10-15 cm and is fixed by adopting a wooden stick or a bamboo rod tying line with the height of 50 cm. The rest is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: and fifthly, selecting the position of the first escape-proof net, and ensuring that the vertical height of the 60-70 cm polyethylene net piece on the upper part of the first escape-proof net is 70-90 cm from the final water injection surface to the underwater after secondary water injection. The rest is the same as one of the first to sixth embodiments.
The embodiment ensures that the first escape-proof net is almost completely frozen in the ice layer after the ice is sealed.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: feeding according to the water temperature of the pond, wherein the daily feeding amount accounts for 0.5-1% of the total weight of the shrimp bodies when the water temperature is 10-15 ℃, and feeding granulated feed once in the afternoon every day; the pellet feed comprises the following nutritional components: crude protein 32%, crude fiber 9%, crude ash 16%, crude fat 4%, total phosphorus 1%, lysine 1.5% and moisture 12%. The rest is the same as one of the first to seventh embodiments.
In the embodiment, the feed is provided for the procambarus clarkii according to the water temperature, and meanwhile, the water fertilizing preparation and the biological preparation can be applied in time according to the water color, algae and water quality change.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: in the eighth step, the water injection speed of the secondary water injection is 50m3H is used as the reference value. The rest is the same as the first to eighth embodiments.
The water injection height is adjusted according to the actual different ice-sealing dates every year in the embodiment, the water injection time is accurately mastered, the water injection speed is controlled to avoid the stress response of the shrimp body, the ice thickness is continuously increased along with the temperature reduction, the water level of an unfrozen layer can be reduced, and therefore the water injection height is adjusted according to the overwintering weather.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: and step nine, when the dissolved oxygen under ice is lower than 5mg/L, ice breaking and oxygen increasing are carried out in real time. The rest is the same as one of the first to ninth embodiments.
The following examples were employed to demonstrate the beneficial effects of the present invention:
the method for the iced overwintering of the outdoor pond of the parent procambarus clarkii in the cold area comprises the following steps:
selecting an overwintering pond with the area of 12 mu, the slope ratio of 23:1 and the pond depth of 2.0 m;
secondly, injecting underground water into the overwintering pond 15 days before releasing the shrimps, wherein the water depth in the overwintering pond after water injection is 1.2 m;
thirdly, cleaning the pond by using quicklime, and then using B-type peptide fertilizer and fertilizer water, wherein the transparency of the overwintering pond is controlled to be 28-30 cm; the using amount of the quicklime is 100-150 kg/mu, and the using amount of the B-type peptide fertilizer is 2-3 kg/mu/m;
fourthly, when the pH value of pool water in the overwintering pond is 8.0-8.3, transplanting the waterweeds into the overwintering pond, and placing 300 honeycomb-shaped pvc shrimp nests in a deep water area of the overwintering pond; the coverage rate of the elodea nuttallii is 30%;
fifthly, arranging a first anti-escape net at a position 1m away from the highest water level line around a pond stem of the overwintering pond, sewing a black thick plastic film with the width of 20cm at the top end of the inner side and a polyethylene net sheet with the mesh size of 3mm to surround the pond, fixing the net sheet by using a bamboo stick, burying the net sheet 30cm underground, enabling the net periphery to be 90cm higher than the ground, enabling the overground part to incline inwards the pond to form an included angle of 60 degrees with the horizontal plane, and taking the net sheet as a first underwater protective measure; arranging a second land escape-proof net on a dam of the overwintering pond, arranging a second land escape-proof arrangement on the horizontal pond ridge surface at the position 15m away from the inner slope of the first land escape-proof net, sewing a black plastic film with the width of 20cm at the top end of the inner side and a polyethylene net sheet with the meshes of 5mm to surround the pond, fixing bamboo sticks, vertically burying the net sheet 20cm underground, and taking the net enclosure 30cm higher than the ground as a second land escape-proof facility;
sprinkling anti-stress Vc in the last ten days of six and 10 months, wherein the dosage is 300 g/mu, and after two hours, 150kg of 8-10 cm of procambarus clarkii parent shrimps are put into an overwintering pond;
seventhly, monitoring the water quality and the water temperature change of the overwintering pond, maintaining the stable water quality of the overwintering shrimps, providing the parent shrimps with feed according to the water temperature change, and stopping feeding when the water temperature is lower than 10 ℃;
eighthly, carrying out secondary water injection to the overwintering pond to the depth of 2.5m at the initial stage of ice sealing; most of the first escape-proof net is frozen in the ice layer, so that the parent procambarus clarkii is effectively prevented from being frozen in the 85cm thick ice layer under the extremely cold condition, and the living condition of the parent procambarus clarkii is guaranteed;
constantly and regularly patrolling the pond during the ice-sealing period of overwintering, well managing during the overwintering period, regularly removing snow to keep the transmittance of an ice layer to be 50-80cm, and ensuring that the dissolved oxygen under ice is not less than 5 mg/L; when the concentration is lower than 5mg/L, ice breaking and oxygen increasing are carried out in real time;
and ten days or 4 months and the middle ten days in the next year, completing the outdoor ice-water overwintering of the pond of the procambarus clarkii parents in the cold area.
By the method of the embodiment, the overwintering survival rate of the parent crayfish of the procambarus clarkii reaches 72.8 percent by 4 th of the next year.
In the embodiment, two escape-proof nets are arranged to create the habit of getting rid of the parent shrimps of the Procambrus clarkii by digging holes within 1m above and below the water surface, the net sheets are 80-100 cm higher than the ground, more than 80% of the net sheets are frozen in the ice layer after ice sealing is ensured, the injury of freezing to the parent shrimps is artificially avoided, and the living area of the parent shrimps is ensured to be below the ice layer; digging parent shrimps into the holes more easily than the relatively slow slope of the pond inner slope of 3-4: 1; the escape-proof device is arranged on the horizontal pool ridge and is only used for preventing the escape of the parent shrimps; the time and the depth of the water injection for the two times are controlled because the annual change of the air temperature in winter in the cold region can cause the annual difference of the thickness of the ice layer in the ice-out period, so that the optimal culture depth of the water area below the ice layer is formed by manually adjusting and controlling the real-time air temperature in the winter-crossing period, and the overwintering survival rate of the parent shrimps is improved.

Claims (7)

1. An ice-over-winter method for an outdoor pond of a cold area of a parent of procambarus clarkii is characterized in that the ice-over-winter method for the outdoor pond of the cold area of the parent of procambarus clarkii is specifically carried out according to the following steps:
firstly, selecting an overwintering pond with an aspect ratio of 3-4: 1 and a slope ratio of 1: 3;
secondly, injecting underground water into the overwintering pond 15 days before releasing the shrimps, wherein the water depth in the overwintering pond after water injection is 1-1.2 m;
thirdly, firstly, quicklime is used for cleaning the pond, then B-type peptide fertilizer water is used for fertilizing, and the transparency of the overwintering pond is controlled to be 28-30 cm; the amount of the quicklime is 100-150 kg/mu per 1m of water depth, and the amount of the B-type peptide fertilizer is 2-3 kg/mu per 1m of water depth;
fourthly, when the pH value of pond water in the overwintering pond is 8.0-8.3, transplanting the waterweeds into the overwintering pond, and placing honeycomb-shaped pvc shrimp nests in a deep water area of the overwintering pond; the coverage rate of the waterweeds is 30-50%;
fifthly, arranging a first escape-proof net at the position, 1-1.2 m away from the highest water level line, of the periphery of the pond stalk of the overwintering pond, and taking the first escape-proof net as a first underwater protective measure; arranging a second escape-proof net on the dam of the overwintering pond to serve as a second land escape-proof facility;
the first escape-proof net is formed by connecting a black plastic film with the width of 20cm and a polyethylene net piece with the mesh size of 6mm, the black plastic film is sewn at the top end of the inner side of the polyethylene net piece, the height of the polyethylene net piece is 120cm, the polyethylene net piece is vertically buried under the ground for 20-30 cm, the included angle between the polyethylene net piece and the horizontal plane is 60-90 degrees, and the polyethylene net piece is fixed by adopting a wooden stick or a bamboo binding line with the height of 120 cm; the position of the first escape-proof net is selected, and after secondary water injection, the vertical height of a 60-70 cm polyethylene net sheet at the upper part of the first escape-proof net from the final water injection surface to the underwater is 70-90 cm;
the second escape-proof net is 30-40 cm high and is formed by connecting a black plastic film with the width of 5cm and a polyethylene net piece with the mesh size of 6mm together, the polyethylene net piece is vertically buried 10-15 cm underground and is fixed by a wooden stick or a bamboo rod binding line with the height of 50 cm;
putting healthy procambarus clarkii parents with the individual length of 8-12 cm into a pond in a sunny and warm weather, wherein the stocking density is 25-80 kg/mu, the male-female ratio is 2:1, and the anti-stress Vc is sprayed to 250-500 g/mu at the same time;
seventhly, determining daily feeding amount according to the water temperature and weather changes, and finishing feeding work before overwintering;
eighthly, carrying out secondary water injection in the overwintering pond at the initial stage of ice sealing until the water depth is 2.2-2.5 m;
constantly and regularly patrolling the pond during the ice-sealing period of overwintering, well managing during the overwintering period, regularly removing snow to keep the transmittance of an ice layer to be 50-80cm, and ensuring that the dissolved oxygen under ice is not less than 5 mg/L;
and ten days or 4 months and the middle ten days in the next year, completing the outdoor ice-water overwintering of the pond of the procambarus clarkii parents in the cold area.
2. The method for overwintering under ice in the outdoor pond of the parent procambarus clarkii in the cold area according to claim 1, wherein the area of the overwintering pond in the step one is 10-15 mu, and the unfrozen water layer after ice sealing is not less than 1.2-1.5 m.
3. The method of claim 1, wherein the specification of the honeycomb-shaped pvc shrimp nests in the fourth step is 100cm x 30cm x 9cm, and the honeycomb-shaped pvc shrimp nests are placed at 25-50/mu.
4. The method of claim 1, wherein in the fourth step, the honeycomb-shaped pvc shrimp nests are formed by assembling two rectangular single-sheet pvc plates with M-shaped cross sections, and the avoidance holes are hexagonal holes with a diameter of 6cm and a length of 20 cm.
5. The method for overwintering under ice in the outdoor pond of the parent procambarus clarkii in the cold area according to claim 1, wherein in the seventh step, the feeding work is carried out according to the water temperature of the pond, the feeding amount accounts for 0.5-1% of the total weight of the procambarus clarkii when the water temperature is 10-15 ℃, and granulated feed is fed once in the afternoon every day; the pellet feed comprises the following nutritional components: crude protein 32%, crude fiber 9%, crude ash 16%, crude fat 4%, total phosphorus 1%, lysine 1.5% and moisture 12%.
6. The method of claim 1, wherein the water injection rate of the secondary water injection in the eighth step is 50m3/h。
7. The method for overwintering under ice in the outdoor pond of the parent procambarus clarkii in the cold area as claimed in claim 1, wherein in the ninth step, the ice breaking and oxygen increasing are carried out in real time when the dissolved oxygen under ice is less than 5 mg/L.
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