CN111543359A - Variable flow relay type fish recirculating aquaculture method - Google Patents
Variable flow relay type fish recirculating aquaculture method Download PDFInfo
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- CN111543359A CN111543359A CN202010430640.1A CN202010430640A CN111543359A CN 111543359 A CN111543359 A CN 111543359A CN 202010430640 A CN202010430640 A CN 202010430640A CN 111543359 A CN111543359 A CN 111543359A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/10—Culture of aquatic animals of fish
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/003—Aquaria; Terraria
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
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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
Abstract
The invention relates to a variable flow relay type fish recirculating aquaculture method in the technical field of aquaculture engineering, which is characterized in that according to the physiological metabolism law of fish, the circulation rate is reduced before feeding, the water circulation flow of a system is improved after feeding, solid particles such as residual bait, excrement and the like are accelerated to be discharged out of a culture pond, after most solid matters are discharged, the circulation rate is returned to a normal level, the basic water quality is maintained to be constant, the healthy growth of fish is ensured, the method is beneficial to fish ingestion, and meanwhile, the pollution discharge efficiency of the fish pond can be enhanced, and the safety of culture water quality is ensured; by combining culture ponds with different specifications, fishes with different specifications can be cultured in the same culture system, the load borne by the culture system is kept close to a saturated state, and the operation energy efficiency of the culture system is improved; through the automatic control of various valves, liquid level sensors, variable frequency pumps and other equipment, the problem of system water balance damage caused by circulation volume change is solved, and the circulation volume of the circulating water culture system is adjustable.
Description
Technical Field
The invention relates to the technical field of aquaculture engineering, in particular to a fish circulating water culture method.
Background
The industrial circulating water aquaculture is a novel efficient industrial and intensive aquaculture technology, can realize water recycling of more than 95% through integration of a water treatment technology, has the obvious advantages of water conservation, land conservation, high health efficiency, environment controllability, product quality safety and the like, is an important direction for realizing transformation and upgrading and green development of aquaculture industry, and is also an important way for moving to the strong fishery.
Through the development of the nearly 40 years, domestic circulating water culture makes great progress in the aspects of facility equipment, system mode, management experience and the like, and has the capabilities of independently constructing a culture system and normally producing and operating. However, there are several disadvantages:
1) the energy efficiency utilization rate of the culture system is insufficient. The currently constructed breeding system in China generally adopts breeding ponds with the diameter (or length and width) of 6-8m, and 6-10 breeding ponds form one group to breed the juvenile fish to the commodity specification for about 1 year (taking tilapia, grouper, turbot and the like as examples). By adopting the mode, the system bears lower culture load because the fish body has smaller specification in the early culture period. Only in a short period of time at the end of the cultivation period, the system load is saturated. The problem that brings from this is that aquaculture system works in the low-load operating mode for a long time, and whole efficiency utilization is lower.
2) The circulation volume of the system is not adjustable, and the requirement of healthy growth of fishes with different specifications from small to large cannot be met. The circulation volume design of the recirculating aquaculture system is mainly designed to meet the water treatment requirement when the maximum load is borne, and the flow velocity in the aquaculture pond can reach 20-30cm/s through water inflow and flow pushing. On one hand, the flow velocity is relatively high for juvenile fish, and on the other hand, the feed is easily taken out of the culture pond along with water flow and cannot be taken up by the fish, so that the feed is wasted, and the growth of the fish is influenced. If the circulation amount is reduced, the pollution discharge and the water treatment effect of the culture pond can be adversely affected.
3) The sewage discharge of the culture pond is not timely, and the water quality is affected by the excrement and the residual bait. The culture pond of the recirculating aquaculture system is generally pushed by water flow to form a rotating flow state, and solid matters such as residual bait, excrement and the like are taken out. The number of water circulation in foreign countries is generally 1-2 times per hour, while the number of water circulation in domestic countries is generally 0.7-1 times per hour in consideration of energy consumption cost. The problem caused by the method is that solid matters are not discharged in time in the long-term operation process, and the water quality and the fish growth are influenced.
4) Studies have shown that fish voiding activity is primarily concentrated 1-2 hours after ingestion. According to the rule, an automatic control means can be adopted, the water circulation quantity of the system is increased in time after ingestion, the flow speed in the culture pond is improved, and the pollution discharge effect is enhanced. After the concentrated excretion time is over, the normal water circulation amount is recovered. However, the problem with this is that the water balance of the entire system is disrupted due to changes in flow, either by spillage of the water or by the sump being drained.
Disclosure of Invention
The invention aims to provide a variable flow relay type fish recirculating aquaculture method which is beneficial to fish ingestion, can enhance the pollution discharge efficiency of a fish pond and ensures the aquaculture water quality safety.
The purpose of the invention is realized as follows: a variable flow relay type fish recirculating aquaculture method relates to a system comprising a pump pool, a variable frequency pump, a recirculating water treatment device, an aquaculture pool and a micro-filter, wherein the pump pool, the variable frequency pump, the recirculating water treatment device, the aquaculture pool and the micro-filter are sequentially communicated to form a circulating water path, and the micro-filter is arranged on a water return pipeline;
the method comprises the following steps:
s1, before feeding, reducing the power output of the variable frequency pump to reduce the cycle times of the system in unit time, reducing the water flow speed in the culture pond to help fish to eat, and then feeding;
s2, after the feeding is finished, increasing the power output of the variable frequency pump to increase the cycle times of the system in unit time so as to bring most of the excrement and the residual bait in the culture pond out of the culture pond;
and S3, reducing the circulation number of the system in unit time to a normal circulation state.
Furthermore, each culture pond is internally provided with a dissolved oxygen sensor for monitoring the content of dissolved oxygen, the circulating water treatment device is communicated with an oxygen supply pipeline so as to be communicated with an oxygen source, an oxygen valve is arranged on the oxygen supply pipeline, and the opening degree of the oxygen valve is adjusted according to data fed back by the dissolved oxygen sensor so as to adjust the air inflow of oxygen and enable the concentration of the dissolved oxygen in the culture water body to be higher than a safety value.
Furthermore, a water inlet valve and a water inlet flow meter are sequentially arranged on a water inlet pipeline of each culture pond, a water return valve is arranged on a water return pipeline of the circulating water channel, and the water inlet flow meter is used for monitoring the flow of each culture pond so as to control the opening degree of the water inlet valve and the opening degree of the water return valve.
Furthermore, the pump pool is communicated with a water supplementing pipeline which is in butt joint with a water supplementing source, and a water supplementing valve is arranged on the water supplementing pipeline.
And furthermore, a liquid level sensor and an overflow valve are arranged in the pump pool, whether the overflow valve needs to be opened or not is judged according to a signal of the liquid level sensor, and whether a water replenishing valve needs to be opened or not is judged according to a signal of the liquid level sensor.
Furthermore, the culture pond is divided into a first-stage culture pond, a second-stage culture pond and a third-stage culture pond, the volumes and the water quantities of the first-stage culture pond, the second-stage culture pond and the third-stage culture pond are sequentially increased, the water outlet end of the circulating water treatment device is communicated with the water inlet ends of the first-stage culture pond, the second-stage culture pond and the third-stage culture pond, the first-stage culture ponds are provided with a plurality of water inlet ends and are sequentially communicated according to the water flow direction, the water outlet end of the most downstream first-stage culture pond is communicated with the micro-filter, the second-stage culture pond and the third-stage culture pond are sequentially communicated, and the water outlet end of the third-stage culture pond is communicated with the micro-filter; the method comprises the following steps of dividing a one-year fish culture cycle into three stages, wherein each stage is four months, a first-stage culture pond, a second-stage culture pond and a third-stage culture pond sequentially correspond to the first-stage, second-stage and third-stage fish culture cycles, and fish are sequentially switched among the first-stage culture pond, the second-stage culture pond and the third-stage culture pond according to the culture cycles during culture so as to form relay culture.
The invention has the beneficial effects that:
1. by combining culture ponds with different specifications, fishes with different specifications can be cultured in the same culture system, the load borne by the culture system is kept close to a saturated state, and the operation energy efficiency of the culture system is improved;
2. according to the physiological metabolism law of fishes, the circulation rate is reduced before feeding, the water circulation flow of a system is improved after feeding, solid particles such as residual baits, excrement and the like are accelerated to be discharged out of the culture pond, after most solid matters are discharged, the circulation rate is returned to a normal level, the basic water quality is maintained to be constant, the healthy growth of fishes is ensured, the method is beneficial to fish ingestion, and meanwhile, the pollution discharge efficiency of the fish pond can be enhanced, and the water quality safety of culture is ensured;
3. through the automatic control of various valves, liquid level sensors, variable frequency pumps and other equipment, the problem of system water balance damage caused by circulation volume change is solved, and the circulation volume of the circulating water culture system is adjustable.
Drawings
Fig. 1 is a system layout diagram of the present invention.
Fig. 2 is a technical schematic of the present invention.
FIG. 3 is a logical relationship control diagram of the present invention.
In the figure, a culture pond 1, a first-stage culture pond 1a, a second-stage culture pond 1b, a third-stage culture pond 1c, a pump pond 2, a variable frequency pump 3, a circulating water treatment device 4, a water inlet valve 5, a water inlet flow meter 6, a water return valve 7, a micro-filter 8, a water supplementing valve 9, an oxygen valve 10, an overflow valve 11, a liquid level sensor 12 and a dissolved oxygen sensor 13 are arranged in the culture pond.
Detailed Description
The invention will be further described with reference to the accompanying figures 1-3 and specific examples.
As shown in fig. 1-2, the variable flow relay type fish recirculating aquaculture system is arranged as follows:
the system comprises a pump pool 2, a variable frequency pump 3, a circulating water treatment device 4, a culture pool 1 and a micro-filter 8, wherein the pump pool 2, the variable frequency pump 3, the circulating water treatment device 4, the culture pool 1 and the micro-filter 8 are sequentially communicated to form a circulating water path, and the micro-filter 8 is arranged on a water return pipeline.
The culture pond 1 is used for providing basic environment for feeding and growing fishes;
the circulating water treatment device 4 has multiple functions of physical filtration, biological filtration, disinfection, sterilization, degassing, oxygenation and the like, can effectively remove residual bait and excrement in the aquaculture water body, ammonia nitrogen generated by fish metabolism, supplement consumed dissolved oxygen and the like, and maintains the aquaculture water quality to meet the requirement of healthy growth of the fish.
The system also comprises an electrical control device (such as a control center device like a PLC (programmable logic controller) electric control cabinet) for controlling the on and off of the electrical equipment in the system.
The culture pond 1 is divided into a first-stage culture pond 1a, a second-stage culture pond 1b and a third-stage culture pond 1c, the volumes and the water quantities of the first-stage culture pond 1a, the second-stage culture pond 1b and the third-stage culture pond 1c are sequentially increased, the water outlet end of a circulating water treatment device 4 is communicated with the water inlet ends of the first-stage culture pond 1a, the second-stage culture pond 1b and the third-stage culture pond 1c, the first-stage culture pond 1a is provided with a plurality of water outlets which are sequentially communicated according to the water flow direction, the water outlet end of the most downstream first-stage culture pond 1a is communicated with a micro-filter 8, the second-stage culture pond 1b and the third-stage culture pond 1c are sequentially communicated, the water outlet end of the third-stage culture pond 1c is communicated with a micro-filter 8, so that water flowing out of all the culture ponds 1 flows back into a pump pond 2 through the filtering action of the micro-filter 8 and is lifted to the, and flows to each culture pond 1 after the treatment is finished.
Each culture pond 1 is internally provided with a dissolved oxygen sensor 13 for monitoring the content of dissolved oxygen, the circulating water treatment device 4 is communicated with an oxygen supply pipeline for connecting an oxygen source, an oxygen valve 10 is arranged on the oxygen supply pipeline, and the opening degree of the oxygen valve 10 is adjusted according to data fed back by the dissolved oxygen sensor 13 so as to adjust the air inflow of oxygen and enable the concentration of the dissolved oxygen in the culture water body to be above a safe value.
The water inlet pipeline of each culture pond 1 is sequentially provided with a water inlet valve 5 and a water inlet flow meter 6, the water return pipeline of the circulating water pipeline is provided with a water return valve 7, and the water inlet flow meter 6 is used for monitoring the flow of each culture pond 1 so as to control the opening degree of the water inlet valve 5 and the opening degree of the water return valve 7.
The pump pool 2 is communicated with a water supplementing pipeline for butting a supplementing water source, and the water supplementing pipeline is provided with a supplementing water valve 9.
A liquid level sensor 12 and an overflow valve 11 are arranged in the pump pool 2, whether the overflow valve 11 needs to be opened or not is judged according to a signal of the liquid level sensor 12, and whether the water replenishing valve 9 needs to be opened or not is judged according to a signal of the liquid level sensor 12.
In the system design and construction process, the circulation quantity and the circulation times are main design parameters. The circulation quantity is a water flow numerical value when the system is normally circulated, and can be simply understood as water flow flowing out of the culture pond 1 and entering the circulating waterway or water flow flowing back to the culture pond 1 from the circulating waterway. The circulation times are the proportion of the water volume treated by the circulation waterway in unit time to the water volume of the culture pond 1, and the unit is time/hour. The circulation times of 1 time/hour mean that the effective water body in the culture pond 1 can be treated by the circulating waterway once per hour. With 1 effective water body of 100m of the culture pond3For example, design cycle size of 100m3When the time is over, the circulation time is 1 time/hour.
The relay culture method of the embodiment is described in detail below.
As shown in FIG. 1, the one-year fish culture cycle is divided into three stages, each of which is four months, and the first-stage culture pond 1a, the second-stage culture pond 1b and the third-stage culture pond 1c have the specifications of
The water quantity ratio is about 1:2:3, the first-stage culture pond 1a, the second-stage culture pond 1b and the third-stage culture pond 1c sequentially correspond to the fish culture periods of the first stage, the second stage and the third stage, and the first-stage culture pond 1a, the second-stage culture pond 1b and the third-stage culture pond 1c are sequentially switched for fish during culture according to the culture periods to form relay culture.
In particular, four ports are used in the first stage of the fish farming cycle
The weight specification range of the cultured fishes in the first stage culture pond 1a is about 20g-120 g; using two ports in the second stage of the fish-farming cycle
The weight specification range of the cultured fishes in the second stage culture pond 1b is about 120g-350 g; using one bite in the third stage of the fish-farming cycle
The weight specification range of the cultured fishes in the third stage culture pond 1c is about 350g-800 g.
The method is adopted for relay culture, and the cultured live fish is transferred from one stage to the culture pond 1 of the next stage by one round every four months. The load change borne by the whole culture system is increased from the initial 1234.5kg to the final 3249kg, the amplitude is increased by 163%, and the harvest of one batch of adult fish every 4 months can be realized, and simultaneously, one batch of fry is stocked; and if the traditional culture mode is used, the same 82m is adopted3The bearing load of the culture system is increased to 3760kg from the initial 116kg, and the bearing load of the system is changed by more than 30 times after one year.
The variable flow rate regulation and control method in the embodiment is as follows:
1. under the normal working condition, the system maintains the water circulation by the circulation times of 0.7-1 time/hour;
2. 10min before feeding, the circulation frequency is reduced to 0.3-0.5 times/hour, so that the flow velocity of water in the culture pond 1 is reduced, the fish can eat the feed, and the normal excretion of the fish reaches the peak value 90min after feeding is completed;
3. at the moment, the circulation frequency of the system is gradually increased to about 1.5-2 times/hour and maintained for about 30min, so that the excrement and residual bait in the culture pond 1 can be completely taken out of the culture pond 1;
4. finally, the circulation times are recovered to the conventional circulation state of 0.7-1 times/hour.
Because the specifications of the culture ponds 1 in the culture system are different, the water inflow of each culture pond 1 must be monitored; meanwhile, the water balance is damaged due to the change of the circulating water quantity of the system, so a complete logic control system is necessary to maintain the balance of the system.
The specific implementation is shown in fig. 2: a variable frequency pump 3 is arranged in the circulating water path, water is pumped from the pump pool 2 to lift the circulating water treatment device 4, and the flow parameter meets the requirement of the maximum working condition of the cycle times for 1.5-2 times/hour; a water inlet pipeline of each culture pond 1 is provided with a water inlet valve 5 and a water inlet flow meter 6; a dissolved oxygen sensor 13 is arranged in each culture pond 1; a water return valve 7 is arranged on a water return pipeline of the culture pond 1; a liquid level sensor 12, a make-up water valve 9 (communicated with a pipeline leading to a make-up water source) and an overflow valve 11 are arranged in the pump pool 2; an oxygen valve 10 is installed in an oxygen supply pipeline of the circulating water treatment device 4.
The logic control of the system is as shown in fig. 3, and the central control device sends control instructions to the variable frequency pump 3, the water return valve 7, the water inlet valve 5, the make-up water valve 9, the overflow valve 11 and the like according to feeding signals of the automatic feeding device. When the circulation volume needs to be reduced, the working frequency of the variable frequency pump 3 is firstly reduced step by step, and the flow volume is reduced to 0.3-0.5 times/hour. Meanwhile, the opening degrees of the water return valve 7 and the water inlet valve 5 are slowly reduced; and judging whether the overflow valve 11 needs to be opened or not according to the signal of the liquid level sensor 12 in the pump pool 2. When the circulation volume needs to be increased, firstly, the opening degree of the water inlet valve 5 of each culture pond 1 is slowly increased; the working frequency of the variable frequency pump 3 is gradually increased, and the flow rate is increased to 1.5-2 times/hour. Meanwhile, the opening degree of the water return valve 7 is slowly adjusted to be larger; and judging whether the make-up water valve 9 needs to be opened according to the signal of the liquid level sensor 12 in the pump pool 2. Whether the circulation volume is increased or decreased, the opening degrees of the water inlet valve 5 and the water return valve 7 are determined according to feedback signals of the water inlet flow meter 6 of each culture pond 1, and the oxygen gas inflow amount is adjusted (the opening degree of the oxygen valve 10 is controlled) according to data fed back by the dissolved oxygen sensor 13, so that the dissolved oxygen concentration in the culture water body is ensured to be higher than a safety value.
While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A variable flow relay type fish recirculating aquaculture method is characterized in that:
the system related by the method comprises a pump pool (2), a variable frequency pump (3), a circulating water treatment device (4), a culture pool (1) and a micro-filter (8), wherein the pump pool (2), the variable frequency pump (3), the circulating water treatment device (4), the culture pool (1) and the micro-filter (8) are sequentially communicated to form a circulating water path, and the micro-filter (8) is arranged on a water return path;
the method comprises the following steps:
s1, before feeding, reducing the power output of the variable frequency pump (3) to reduce the circulation frequency of the system in unit time, reducing the water flow speed in the culture pond (1) to help fish to eat, and then feeding;
s2, after the feeding is finished, increasing the power output of the variable frequency pump (3) to increase the cycle times of the system in unit time, so as to bring most of the excrement and residual bait in the culture pond (1) out of the culture pond (1);
and S3, reducing the circulation number of the system in unit time to a normal circulation state.
2. The variable flow relay type fish recirculating aquaculture method according to claim 1, characterized in that: every breed pond (1) and all embed dissolved oxygen sensor (13) that are used for monitoring dissolved oxygen content, circulating water treatment facilities (4) switch-on has the oxygen supply pipeline to switch on the oxygen source, be equipped with oxygen valve (10) on the oxygen supply pipeline, adjust the aperture of oxygen valve (10) according to the data of dissolved oxygen sensor (13) feedback, with the regulation oxygen air input to make the dissolved oxygen concentration of aquaculture water more than the safe value.
3. The variable flow relay type fish recirculating aquaculture method according to claim 1, characterized in that: all be equipped with inlet valve (5), inflow flow meter (6) on the inlet line in proper order in every breed pond (1), be equipped with return water valve (7) on the return water pipeline in circulation water route, utilize inflow flow meter (6) to carry out flow monitoring to every breed pond (1) to the aperture size of control inlet valve (5) and return water valve (7).
4. The variable flow relay type fish recirculating aquaculture method according to claim 1, characterized in that: the pump pool (2) is communicated with a water supplementing pipeline which is in butt joint with a water supplementing source, and a water supplementing valve (9) is arranged on the water supplementing pipeline.
5. The variable flow relay type fish recirculating aquaculture method according to claim 4, characterized in that: be equipped with level sensor (12) and overflow valve (11) in pump pond (2), judge according to the signal of level sensor (12) whether need open overflow valve (11), judge according to the signal of level sensor (12) whether need open make-up water valve (9).
6. The variable flow relay type fish recirculating aquaculture method according to any one of claims 1-5, characterized in that:
the culture pond (1) is divided into a first stage culture pond (1a), a second stage culture pond (1b) and a third stage culture pond (1c), the volumes and the water quantities of the first-stage culture pond (1a), the second-stage culture pond (1b) and the third-stage culture pond (1c) are sequentially increased, the water outlet end of the circulating water treatment device (4) is communicated with the water inlet ends of the first-stage culture pond (1a), the second-stage culture pond (1b) and the third-stage culture pond (1c), the first-stage culture ponds (1a) are provided with a plurality of culture ponds and are sequentially communicated according to the water flow direction, the water outlet end of the first-stage culture pond (1a) at the most downstream is communicated with the micro-filter (8), the second-stage culture pond (1b) and the third-stage culture pond (1c) are sequentially communicated, and the water outlet end of the third-stage culture pond (1c) is communicated with the micro-filter (8);
the one-year fish culture cycle is divided into three stages, each stage is four months, a first-stage culture pond (1a), a second-stage culture pond (1b) and a third-stage culture pond (1c) sequentially correspond to the first-stage, second-stage and third-stage fish culture cycle, and fish are sequentially switched among the first-stage culture pond (1a), the second-stage culture pond (1b) and the third-stage culture pond (1c) according to the culture cycle during culture so as to form relay culture.
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| CN113728970A (en) * | 2021-09-07 | 2021-12-03 | 浙江大学 | Circulating water culture variable-speed flow intelligent regulation and control system and method based on multi-parameter combined control |
| CN114190307A (en) * | 2021-11-25 | 2022-03-18 | 中国水产科学研究院黄海水产研究所 | Cynoglossus semilaevis circulating water culture enteritis prevention and treatment method |
| CN114847215A (en) * | 2022-05-26 | 2022-08-05 | 武汉联渔机械设备有限公司 | Circulating water culture system, control device, method and storage medium |
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