High-efficiency and low-consumption breeding method for cold water shrimp fry and fingerling

Abstract

The invention relates to the technical field of aquaculture, in particular to an efficient and low-consumption cold water shrimp fry and fingerling breeding method. The method comprises the following steps: laying microcapsules for packaging paraffin phase-change materials at the bottom of a breeding pool, injecting underground water in a pulse manner through an annular water distribution pipeline, monitoring the water temperature in real time by using a wireless temperature sensor, and regulating and controlling the water temperature in combination with intelligent temperature control logic. According to the invention, temperature fluctuation is buffered bidirectionally through heat absorption and heat release of the phase-change material, and an underground water pulse injection technology is combined, so that the problems of high embryo death rate and over-high energy consumption caused by temperature fluctuation and embryo displacement damage caused by water flow disturbance in the prior art are solved, and the embryo death rate and energy consumption are remarkably reduced; the device is suitable for hatching cold water fries such as rainbow trout and cold water shrimps, and has the advantages of high stability, good economical efficiency and strong ecological property.

Description

Technical Field

[0001] This invention belongs to the field of aquaculture technology, specifically relating to a highly efficient and low-consumption method for breeding cold-water shrimp fry and fish fry. Background Technology

[0002] In the breeding of cold-water fish fry and shrimp, temperature stability is a key factor affecting hatching success rate and larval survival rate. Existing technologies mainly achieve water temperature control through mechanical refrigeration or groundwater circulation, but these methods have certain limitations in terms of energy consumption, operational precision, and adaptability to the ecological environment.

[0003] Patent CN109220951A discloses an aquaculture pond, whose technical solution includes a heat exchange device, a temperature measuring device, and a heating device. By placing the hot water exchange pipe 80-120 meters below the pond, the water temperature is regulated using the constant temperature characteristics of groundwater, and the heating device compensates for the temperature fluctuations. While this technical solution can maintain water temperature stability to a certain extent, the difficulty in precisely controlling the groundwater injection volume easily leads to fluctuations in water salinity, and the equipment also consumes a significant amount of energy during operation.

[0004] Patent CN104412934A discloses a heating system for aquaculture. Its technical solution employs a combination of an internal heating wire and a circulating pump. The heating wire heats the water inside the casing, and the circulating pump then delivers the hot water to the aquaculture pond. This solution can achieve localized water temperature increases. However, because the heating process relies on electricity, and the heat transfer efficiency is significantly affected by water flow velocity, high energy consumption and insufficient temperature uniformity are prominent issues in large-scale aquaculture scenarios.

[0005] Neither of the aforementioned technical solutions adequately addresses the need for low-energy consumption and high-precision temperature control during the breeding of cold-water fish fry and shrimp, particularly lacking effective buffering mechanisms and intelligent control methods to handle temperature fluctuations within ±0.5℃. Furthermore, existing technologies also have room for improvement in terms of eco-friendliness and resource utilization, necessitating a more efficient, energy-saving, and environmentally friendly method for breeding cold-water shrimp and fish fry. Summary of the Invention

[0006] To overcome the problems of high embryo mortality, excessive energy consumption, and embryo displacement damage caused by water flow disturbance caused by temperature fluctuations, this invention provides a highly efficient and low-consumption method for breeding cold-water shrimp and fish fry. By introducing biocompatible phase change material microcapsules and groundwater pulse injection technology, combined with intelligent temperature control logic, the problems in the existing technology are solved.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a highly efficient and low-consumption method for breeding cold-water shrimp and fish fry, comprising the following steps: S10: 24 hours before the fish fry are introduced into the pond, microcapsules containing paraffin-based phase change materials are evenly laid inside the substrate at the bottom of the breeding pond or laid below the substrate layer and fixed with a permeable net to form a continuous layer with a coverage area of ​​not less than 95%; the microcapsules have a diameter of 50 to 100 micrometers, the phase change material has a melting point of 4.5℃ and a latent heat value of 200J / g; S20: Lay a ring-shaped water distribution pipe in the substrate layer at the bottom of the breeding pond. The pipe openings face the bottom of the pond and are spaced 15 cm apart. Connect the pipe to the groundwater well through a pulse control valve. S30: A suspended wireless temperature sensor is placed in the middle of the water body, collecting water temperature data every 5 minutes and transmitting it to a microprocessor; S40: When the water temperature is below or equal to 4.3℃, the microprocessor triggers the pulse control valve to open and inject groundwater at 12℃ to raise the temperature of the mixed water. The injection of higher-temperature groundwater directly raises the water temperature and at the same time causes the solidified phase change material to absorb heat and melt to store heat, preventing the water temperature from dropping too quickly. When the injection stops, if the water temperature drops back to the 4.5℃ phase change point, the phase change material solidifies and releases latent heat, delaying the drop in water temperature.

[0008] S50: When the water temperature is higher than or equal to 4.7℃, the phase change material undergoes a phase change and melts, absorbing heat and inhibiting the rise in water temperature without the need for active intervention. S60: If the water temperature is still below 4.3℃ after 3 consecutive injections, shorten the pulse interval from 60 minutes to 30 minutes; otherwise, maintain the 60-minute interval.

[0009] In step S10, food-grade paraffin wax is used as the phase change material, specifically a straight-chain alkane paraffin phase change material with a latent heat value of 200 J / g. The microcapsules are encapsulated with sodium alginate and the density is adjusted to 1.0 g / cm³. This design ensures that the microcapsules, after being laid, can be located inside the matrix layer or laid below the matrix layer and fixed with a permeable mesh, while being physically separated from the matrix but allowing for unimpeded heat exchange.

[0010] In some embodiments, the method for preparing microcapsules in step S10 includes the following steps: M1: Food-grade paraffin with a melting point of 4.5±0.1℃ and a latent heat value of 200±5J / g was selected as the phase change material and encapsulated in sodium alginate microcapsules using microfluidic technology; M2: The diameter of the microcapsules is controlled at 75±25 micrometers, and the density of the microcapsules is adjusted to 1.0 g per cubic centimeter to match the density of the water. M3: Microcapsules are evenly distributed at a rate of 1.2 kg per square meter on the bottom of the pool, achieving a coverage rate of 97.5% and forming a continuous thermal buffer layer.

[0011] In some embodiments, step S20 involves selecting a shallow groundwater well with a constant water temperature of 12.0 ± 2.0℃ and a depth of 15 to 20 meters, connected to a pulse control valve with a response time of less than 0.5 seconds via a PVC flexible hose. The annular water distribution pipe uses PE pipe with a diameter of 32 mm or 40 mm, laid along the bottom contour of the breeding pool. The pipe opening diameter is 1.5 mm, the spacing is 15 cm, and the opening direction is downward at a 15° angle.

[0012] In some implementations, the temperature sensor in step S30 is a DS18B20 model, fixed on a hollow buoy at a height of 50% of the water depth from the bottom of the pool. The Bluetooth module uploads data to the microprocessor every 5 minutes to achieve real-time monitoring and control of the water temperature.

[0013] In some implementations, in step S40, groundwater is injected at a flow rate of 0.5 liters per second for 10 minutes, with a total injection volume of 0.5% of the pool volume. After the high-temperature water flows into the phase change layer, it causes the phase change material to absorb heat and melt to store heat. The heat stored by the heat absorption and melting is released when the water temperature subsequently decreases, compensating for heat loss.

[0014] In some implementations, the dynamic interval optimization mechanism in step S60 includes the following steps: N1: If the water temperature is still below 4.3℃ after 3 consecutive pulse injections, the system will automatically shorten the pulse interval from 60 minutes to 30 minutes; N2: When historical data indicates that the ambient cooling rate is above 0.1℃ per hour, shorten the interval to buffer the temperature in advance; otherwise, restore the standard 60-minute interval. N3: If the water temperature is higher than or equal to 4.3℃ in the next 3 monitoring tests, the 60-minute standard interval will be automatically restored.

[0015] This invention provides a specific implementation method for a highly efficient and low-consumption method for breeding cold-water shrimp and fish fry, comprising the following stages: 1. Implementation Preparation Phase In the preparation phase, the first step was to prepare phase change material microcapsules. Food-grade paraffin wax with a melting point of 4.5±0.1℃ and a latent heat value of 200±5J / g was selected as the phase change material and encapsulated in sodium alginate microcapsules using microfluidic technology. The microcapsule diameter was controlled at 75±25 micrometers, and the density was adjusted to 1.0 g / cm³ to match the density of the water, ensuring that after laying, it could be located inside the matrix layer or laid below the matrix layer and fixed with a permeable net. The microcapsules were evenly distributed at a rate of 1.2 kg / m² on the bottom of the pool, achieving a coverage rate of 97.5% and forming a continuous thermal buffer layer.

[0016] A groundwater circulation system was then deployed. Shallow groundwater wells with a constant temperature of 12.0±2.0℃ and a depth of 15 to 20 meters were selected and connected to pulse control valves with a response time of less than 0.5 seconds via PVC hoses. The ring-shaped water distribution pipes, made of 32 mm or 40 mm diameter PE pipes, were laid along the bottom contour of the breeding pond. The pipe openings had a diameter of 1.5 mm and a spacing of 15 cm, with the openings angled downwards at a 15° angle to avoid damage to the fry embryos from vertical impact. A DS18B20 temperature sensor was used, fixed to a hollow buoy at 50% of the water depth above the pond bottom. A Bluetooth module uploaded data to the microprocessor every 5 minutes.

[0017] 2. Temperature control execution phase During the temperature control execution phase, the initial temperature control startup process is as follows: When the sensor detects that the water temperature is below or equal to 4.3℃, for example, at 3:00 AM when the water temperature drops to 4.1℃, the microprocessor immediately triggers the pulse control valve to open and inject groundwater. The injection of higher-temperature groundwater directly raises the water temperature, while simultaneously causing the solidified phase change material to absorb heat and melt to store heat, preventing the water temperature from dropping too quickly, and allowing the water temperature to rise back to 4.5℃ within 8 seconds.

[0018] The dynamic interval optimization mechanism further improves temperature control accuracy. If the water temperature remains below 4.3℃ after three consecutive pulse injections, the system automatically shortens the pulse interval from 60 minutes to 30 minutes. When historical data indicates that the ambient cooling rate is greater than 0.1℃ per hour, the interval is shortened to provide a buffer; otherwise, the standard 60-minute interval is restored. If the water temperature is higher than or equal to 4.3℃ in the subsequent three monitoring tests, the standard 60-minute interval is automatically restored.

[0019] The bidirectional temperature buffering principle enables precise water temperature control. In cooling scenarios, when the water temperature exceeds 4.7℃, such as when midday sunlight causes the water temperature to rise to 5.0℃, the phase change material undergoes a phase change and melts, absorbing heat and inhibiting the temperature rise, causing the water temperature to drop back to 4.5℃ within 15 seconds. In heating scenarios, when the water temperature is below 4.3℃, injecting higher-temperature groundwater directly raises the water temperature, while simultaneously causing the solidified phase change material to absorb heat and melt to store heat, preventing the water temperature from dropping too quickly. This bidirectional effect reduces the daily average temperature fluctuation from ±1.8℃ to ±0.25℃, lowering the embryo mortality rate to 8.3%.

[0020] 3. Termination and Cleanup Phase The system automatically stops pulse injection 48 hours after the fish fry rupture. After the breeding cycle ends, the microcapsule layer is recovered by cleaning the underlying substrate.

[0021] This invention provides data to verify the implementation effect. A comparative experiment was conducted at the Yunnan Shanshui Yinong breeding base, and the results are as follows: Experimental data show that the present invention surpasses existing technologies in terms of stability, economy, and ecology.

[0022] This invention provides a specific application scenario for a highly efficient and low-consumption method for breeding cold-water shrimp and fish fry. This invention is applicable to the hatching of all cold-water fish fry, including rainbow trout and cold-water shrimp, without requiring modification to existing breeding pond structures, and has strong operational versatility.

[0023] According to the present invention, since the method uses biocompatible phase change material microcapsules and groundwater pulse injection technology, combined with intelligent temperature control logic, it solves the problems of high embryo mortality caused by temperature fluctuations, excessive energy consumption, and embryo displacement damage caused by water flow disturbance in the prior art, and has significant technical advantages. Detailed Implementation

[0024] The various embodiments or implementations described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. In this description, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an implementation or example that are included in at least one implementation or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementations or examples.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] As described in the background section above, existing methods for breeding cold-water shrimp and fish fry suffer from problems such as high embryo mortality rates due to temperature fluctuations, excessive energy consumption, and embryo displacement damage caused by water flow disturbances. Therefore, this invention provides a highly efficient and low-energy-consumption method for breeding cold-water shrimp and fish fry. This method addresses these problems by introducing biocompatible phase change material microcapsules and groundwater pulse injection technology, combined with intelligent temperature control logic.

[0027] In a first aspect, the present invention provides a method for breeding cold-water shrimp fry and fish larvae, comprising the following steps: S10: 24 hours before the fish fry are introduced into the pond, microcapsules containing paraffin-based phase change materials are evenly laid inside the substrate at the bottom of the breeding pond or laid below the substrate layer and fixed with a permeable net to form a continuous layer with a coverage area of ​​not less than 95%; the microcapsules have a diameter of 50 to 100 micrometers, the phase change material has a melting point of 4.5℃ and a latent heat value of 200J / g; S20: Lay a ring-shaped water distribution pipe in the substrate layer at the bottom of the breeding pond. The pipe openings face the bottom of the pond and are spaced 15 cm apart. Connect the pipe to the groundwater well through a pulse control valve. S30: A suspended wireless temperature sensor is placed in the middle of the water body, collecting water temperature data every 5 minutes and transmitting it to a microprocessor; S40: When the water temperature is below or equal to 4.3℃, the microprocessor triggers the pulse control valve to open and inject groundwater at 12℃ to raise the temperature of the mixed water. The injection of higher-temperature groundwater directly raises the water temperature and at the same time causes the solidified phase change material to absorb heat and melt to store heat, preventing the water temperature from dropping too quickly. When the injection stops, if the water temperature drops back to the 4.5℃ phase change point, the phase change material solidifies and releases latent heat, delaying the drop in water temperature.

[0028] S50: When the water temperature is higher than or equal to 4.7℃, the phase change material undergoes a phase change and melts, absorbing heat and inhibiting the rise in water temperature without the need for active intervention. S60: If the water temperature is still below 4.3℃ after 3 consecutive injections, shorten the pulse interval from 60 minutes to 30 minutes; otherwise, maintain the 60-minute interval.

[0029] According to the present invention, food-grade paraffin is used as the phase change material in step S10, specifically a straight-chain alkane paraffin phase change material with a latent heat value of 200 J / g. The microcapsules are encapsulated with sodium alginate and the density is adjusted to 1.0 g / cm³. This design ensures that the microcapsules, after being laid, can be located inside the matrix layer or laid below the matrix layer and fixed with a water-permeable mesh, while being physically separated from the matrix but allowing for unimpeded heat exchange.

[0030] In some embodiments, the method for preparing microcapsules in step S10 includes the following steps: M1: Food-grade paraffin with a melting point of 4.5±0.1℃ and a latent heat value of 200±5J / g was selected as the phase change material and encapsulated in sodium alginate microcapsules using microfluidic technology; M2: The diameter of the microcapsules is controlled at 75±25 micrometers, and the density of the microcapsules is adjusted to 1.0 g per cubic centimeter to match the density of the water. M3: Microcapsules are evenly distributed at a rate of 1.2 kg per square meter on the bottom of the pool, achieving a coverage rate of 97.5% and forming a continuous thermal buffer layer.

[0031] In some embodiments, step S20 involves selecting a shallow groundwater well with a constant water temperature of 12.0 ± 2.0℃ and a depth of 15 to 20 meters, connected to a pulse control valve with a response time of less than 0.5 seconds via a PVC flexible hose. The annular water distribution pipe uses PE pipe with a diameter of 32 mm or 40 mm, laid along the bottom contour of the breeding pool. The pipe opening diameter is 1.5 mm, the spacing is 15 cm, and the opening direction is downward at a 15° angle.

[0032] In some implementations, the temperature sensor in step S30 is a DS18B20 model, fixed on a hollow buoy at a height of 50% of the water depth from the bottom of the pool. The Bluetooth module uploads data to the microprocessor every 5 minutes to achieve real-time monitoring and control of the water temperature.

[0033] In some implementations, in step S40, groundwater is injected at a flow rate of 0.5 liters per second for 10 minutes, with a total injection volume of 0.5% of the pool volume. After the high-temperature water flows into the phase change layer, it causes the phase change material to absorb heat and melt to store heat. The heat stored by the heat absorption and melting is released when the water temperature subsequently decreases, compensating for heat loss.

[0034] In some implementations, the dynamic interval optimization mechanism in step S60 includes the following steps: N1: If the water temperature is still below 4.3℃ after 3 consecutive pulse injections, the system will automatically shorten the pulse interval from 60 minutes to 30 minutes; N2: When historical data indicates that the ambient cooling rate is above 0.1℃ per hour, shorten the interval to buffer the temperature in advance; otherwise, restore the standard 60-minute interval. N3: If the water temperature is higher than or equal to 4.3℃ in the next 3 monitoring tests, the 60-minute standard interval will be automatically restored.

[0035] Secondly, the present invention provides a specific implementation method for a highly efficient and low-consumption method for breeding cold-water shrimp and fish fry, comprising the following stages: 1. Implementation Preparation Phase In the preparation phase, the first step was to prepare phase change material microcapsules. Food-grade paraffin wax with a melting point of 4.5±0.1℃ and a latent heat value of 200±5J / g was selected as the phase change material and encapsulated in sodium alginate microcapsules using microfluidic technology. The microcapsule diameter was controlled at 75±25 micrometers, and the density was adjusted to 1.0 g / cm³ to match the density of the water, ensuring that after laying, it could be located inside the matrix layer or laid below the matrix layer and fixed with a permeable net. The microcapsules were evenly distributed at a rate of 1.2 kg / m² on the bottom of the pool, achieving a coverage rate of 97.5% and forming a continuous thermal buffer layer.

[0036] A groundwater circulation system was then deployed. Shallow groundwater wells with a constant temperature of 12.0±2.0℃ and a depth of 15 to 20 meters were selected and connected to pulse control valves with a response time of less than 0.5 seconds via PVC hoses. The ring-shaped water distribution pipes, made of 32 mm or 40 mm diameter PE pipes, were laid along the bottom contour of the breeding pond. The pipe openings had a diameter of 1.5 mm and a spacing of 15 cm, with the openings angled downwards at a 15° angle to avoid damage to the fry embryos from vertical impact. A DS18B20 temperature sensor was used, fixed to a hollow buoy at 50% of the water depth above the pond bottom. A Bluetooth module uploaded data to the microprocessor every 5 minutes.

[0037] 2. Temperature control execution phase During the temperature control execution phase, the initial temperature control startup process is as follows: When the sensor detects that the water temperature is below or equal to 4.3℃, for example, at 3:00 AM when the water temperature drops to 4.1℃, the microprocessor immediately triggers the pulse control valve to open and inject groundwater. The injection of higher-temperature groundwater directly raises the water temperature, while simultaneously causing the solidified phase change material to absorb heat and melt to store heat, preventing the water temperature from dropping too quickly, and allowing the water temperature to rise back to 4.5℃ within 8 seconds.

[0038] The dynamic interval optimization mechanism further improves temperature control accuracy. If the water temperature remains below 4.3℃ after three consecutive pulse injections, the system automatically shortens the pulse interval from 60 minutes to 30 minutes. When historical data indicates that the ambient cooling rate is greater than 0.1℃ per hour, the interval is shortened to provide a buffer; otherwise, the standard 60-minute interval is restored. If the water temperature is higher than or equal to 4.3℃ in the subsequent three monitoring tests, the standard 60-minute interval is automatically restored.

[0039] The bidirectional temperature buffering principle enables precise water temperature control. In cooling scenarios, when the water temperature exceeds 4.7℃, such as when midday sunlight causes the water temperature to rise to 5.0℃, the phase change material undergoes a phase change and melts, absorbing heat and inhibiting the water temperature from rising further, causing it to drop back to 4.5℃ within 15 seconds. In heating scenarios, when the water temperature is below 4.3℃, injecting higher-temperature groundwater directly raises the water temperature, while simultaneously causing the solidified phase change material to absorb heat and melt to store heat, preventing the water temperature from dropping too quickly. This bidirectional effect reduces the daily average temperature fluctuation from ±1.8℃ to ±0.25℃.

[0040] 3. Termination and Cleanup Phase The system automatically stops pulse injection 48 hours after the fish fry rupture. After the breeding cycle ends, the microcapsule layer is recovered by cleaning the underlying substrate.

[0041] Thirdly, this invention provides data to verify the implementation effect. A comparative experiment was conducted at the Yunnan Shanshui Yinong breeding base, and the results are as follows: Experimental data show that the present invention surpasses existing technologies in terms of stability, economy, and ecology.

[0042] Fourthly, this invention provides a specific application scenario for a highly efficient and low-consumption method for breeding cold-water shrimp fry and fish fry. This invention is applicable to the hatching of all cold-water fish fry, including rainbow trout and cold-water shrimp, without requiring modification to existing breeding pond structures, and has strong operational versatility.

[0043] According to the present invention, since the method uses biocompatible phase change material microcapsules and groundwater pulse injection technology, combined with intelligent temperature control logic, it solves the problems of high embryo mortality caused by temperature fluctuations, excessive energy consumption, and embryo displacement damage caused by water flow disturbance in the prior art, and has significant technical advantages.

[0044] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for the propagation of cold water prawn larvae and post larvae, characterised in that, Comprising the following steps: S10: 24 hours before the fry into the pool, the microcapsules of encapsulated paraffin phase change material are evenly laid in the bottom substrate or under the substrate layer of the breeding pool and fixed with water-permeable net to form a continuous layer with coverage area not less than 95%; the microcapsules have a diameter of 50 to 100 microns, the phase change material has a melting point of 4.5℃, and the latent heat value is 200 J / g; S20: Laying annular water distribution pipeline in the substrate layer at the bottom of the breeding pool, the pipeline opening is directed to the pool bottom with a spacing of 15 cm, and is connected to the underground water well through a pulse control valve; S30: Suspending a wireless temperature sensor in the middle of the water body, collecting water temperature data every 5 minutes and transmitting to the microprocessor; S40: When the water temperature is lower than or equal to 4.3℃, the microprocessor triggers the pulse control valve to open to inject underground water, which directly raises the water temperature and at the same time promotes the solidified phase change material to melt to store heat to prevent the water temperature from falling too fast; S50: When the water temperature is higher than or equal to 4.7℃, the phase change material melts and absorbs heat to inhibit the rise of water temperature; S60: If the water temperature is still lower than 4.3℃ after 3 times of continuous injection, the pulse interval is shortened from 60 minutes to 30 minutes, otherwise the 60-minute interval is maintained.

2. The method for breeding of cold water prawn larvae and post larvae as claimed in claim 1 wherein, In step S10, food-grade paraffin is used as the phase change material, the latent heat value of which is 200 J / g, and the microcapsules are encapsulated by sodium alginate and the density is adjusted to 1.0 g / cm3.

3. The method for breeding of cold water prawn larvae and post larvae as claimed in claim 1 wherein, The preparation method of the microcapsules in step S10 comprises the following steps: M1: Food-grade paraffin with a melting point of 4.5±0.1℃ and a latent heat value of 200±5 J / g is selected as the phase change material, which is encapsulated in sodium alginate microcapsules by microfluidic technology; M2: The diameter of the microcapsules is controlled to be 75±25 microns, and the density of the microcapsules is adjusted to 1.0 g / cm3; M3: The microcapsules are evenly spread at a rate of 1.2 kg / m2 on the pool bottom, with a coverage rate of 97.5%, forming a continuous heat buffer layer.

4. The method for breeding of cold water prawn larvae and post larvae as claimed in claim 1 wherein, In step S20, a shallow underground water well with a constant water temperature of 12.0±2.0℃ is selected, with a depth of 15 to 20 meters, which is connected to a pulse control valve with a response time of less than 0.5 seconds through a PVC hose; the annular water distribution pipeline is made of PE pipe with a diameter of 32 mm or 40 mm, which is laid along the bottom contour of the breeding pool, the pipeline opening diameter is 1.5 mm, the spacing is 15 cm, and the opening direction is inclined downward by 15°.

5. The method for breeding of cold water prawn larvae and post larvae as claimed in claim 1 wherein, In step S30, the temperature sensor is selected as DS18B20 type, which is fixed on a hollow buoy, with a height of 50% of the water depth from the pool bottom, and the Bluetooth module uploads data to the microprocessor every 5 minutes.

6. The method for breeding of cold water shrimp larvae and post larvae according to claim 1, characterized in that, In step S40, the underground water is injected at a flow rate of 0.5 L / s for 10 minutes, and the total injection amount is 0.5% of the pool volume.

7. The method for breeding of cold water prawn larvae and post larvae as claimed in claim 1 wherein, In step S60, the dynamic interval optimization mechanism comprises the following steps: N1: If the water temperature is still lower than 4.3℃ after 3 times of continuous pulse injection, the system automatically shortens the pulse interval from 60 minutes to 30 minutes; N2: When the historical data shows that the environmental cooling rate is above 0.1℃ per hour, the interval is shortened to buffer in advance; otherwise, the standard interval of 60 minutes is restored. ​ N3: If the water temperature is higher than or equal to 4.3℃ for 3 times in succession, the system will automatically restore the 60-minute standard interval.

8. The method for breeding of cold water shrimp larvae and post larvae according to claim 1, characterized in that, The system automatically stops the pulse injection 48 hours after the hatching of the fish fry; and the microcapsule layer is recovered by cleaning the bottom substrate after the end of the breeding cycle.

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