134 results about "Recirculating aquaculture system" patented technology

The present invention discloses a strain of Stutzerimonas kunmingensis and its application in water denitrification, relating to the field of biotechnology. The Stutzerimonas kunmingensis was deposited in the General Microbiology Center (CGMCC) of the China Culture Collection of Microorganisms on April 24, 2024, with a deposit address of No. 3, Yard No. 1, Beichen West Road, Chaoyang District, Beijing, and a deposit number of CGMCCNO.30427. The present invention isolated and obtained Stutzerimonas kunmingensis 9‑4 from a water sample of a crucian carp recirculating aquaculture system. The strain has a good removal effect on nitrate nitrogen, nitrite nitrogen and ammonia nitrogen in the water environment. At the same time, adding hematite under light conditions can significantly improve the removal rate of nitrate nitrogen, nitrite nitrogen and ammonia nitrogen by the Stutzerimonas kunmingensis, which can be applied to the removal of nitrate nitrogen, nitrite nitrogen and ammonia nitrogen in aquaculture water environment and aquaculture tail water.

The utility model discloses a multifunctional pond recirculating aquaculture system capable of pushing water to make flow, which comprises a purification tank and a control device, the tank wall of the purification tank is provided with a water inlet and a water outlet, the water inlet is connected with a water pumping pipeline provided with a circulating water pump, and the water inlet end of the water pumping pipeline extends into an aquaculture pond; the purification tank is connected with an insertion type nano aeration device, and a foam discharging device is arranged at the top of the purification tank; the water outlet is connected with a water outlet pipeline, the water outlet pipeline is provided with a water-pushing flow-making aeration oxygenation device located above the culture pond, and the position height of the water-pushing flow-making aeration oxygenation device is lower than the position height of the purification tank. According to the utility model, various water treatment devices are integrated into the purification tank in an integrated and centralized manner through reasonable layout, so that the overall space distribution size of a culture system is reduced, water pushing and flow making for aeration and oxygenation can be automatically carried out through the gravity action, the culture cost is greatly reduced, and the oxygenation effect and the medicine throwing diffusivity can be improved through water pushing and flow making.

The invention discloses a movable recirculating aquaculture system and method based on digital twinning. The system comprises a monitoring system used for monitoring aquaculture water body data and aquaculture equipment data and obtaining fish school images; the processing system is connected with the monitoring system and used for receiving and analyzing the aquaculture water body data, the aquaculture equipment data and the fish school images and sending out a control instruction according to an analysis result; the control system is connected with the processing system and used for receiving the control instruction and adjusting related equipment according to the control instruction; and the data storage system is connected with the processing system and is used for storing the aquaculture water body data, the aquaculture equipment data, the fish school images and the analysis results. Data acquisition and real-time processing can be efficiently carried out, the optimal fish school growth condition is analyzed in combination with the water quality environment, and a decision basis is provided for farmers.

The present invention provides a sunlight factory recirculating aquaculture system and method, belonging to the technical field of aquaculture. The sunlight factory recirculating aquaculture system includes a fish pond and a fiber rotary disk filtration system; the fiber rotary disk filtration system can remove large-particle-size particulate matters in the culture water and regularly harvest microalgae, and the treated water quality meets the fishery culture standard, and 97% of the culture water can be directly recycled. In the present invention, during the in-situ cultivation of microalgae and fish, the microalgae can convert nutrients such as CO2 exhaled by the fish and nitrogen and phosphorus in the culture water body into substances of the microalgae cells themselves, such as proteins, polysaccharides, vitamins, and lipids, and release oxygen, rapidly improving the culture water quality; the in-situ cultivation of microalgae and fish gives play to the advantage of the high photosynthetic efficiency of the microalgae, and the rapidly growing microalgae provides a suitable growth environment for the fish. The sunlight factory recirculating aquaculture system and method of the present invention can achieve high-density, high-stability, and low-energy-consumption recirculating aquaculture.

The technical scheme of the utility model discloses a land-based canvas pool litopenaeus vannamei recirculating aquaculture system which comprises an aquaculture pool, and the edge of the bottom of the aquaculture pool inclines towards the center so as to enable aquaculture water and impurities to converge towards the center to a fish closestool. The settling pond is connected with an outlet of the fish closestool through a drainage pipe, and the fluidized bed is connected with the settling pond through a water guide pipe arranged at the water outlet channel; and the microfiltration part is connected with the fluidized bed and the culture pond through a water conduit and a water return pipe respectively. The bottom of the culture pond is inclined, water is drained from the center of the culture pond and enters the culture pond tangentially, so that vortexes are formed in the culture pond, and residual feed, excrement and the like are quickly concentrated towards the water outlet in the center of the bottom of the culture pond under the action of tangential force of water flow. Through a plurality of water inlet pipes and water outlet pipes, the effect of water quality circulation of the culture pond, the sedimentation pond, the fluidized bed biological filter and the rotary drum type micro-filter is achieved, and the problems that suspended solids and ammonia nitrogen are prone to being generated in a traditional prawn culture technology and the nitrite concentration is continuously increased are solved.

The invention provides a seawater circulating aquaculture purification method and system based on BDD electrocatalytic oxidation, and belongs to the technical field of water treatment. The seawater circulating aquaculture purification method provided by the invention is high in feasibility, economical and practical, simple in system equipment, small in occupied area and convenient to use. According to the method provided by the invention, BDD electrocatalytic oxidation is adopted as a core process, the process flow is short, the operation is simple, the occupied area is small, and active chlorine generated by BDD electrocatalytic oxidation is fully utilized in a mixing manner, so that residual chlorine is removed with low energy consumption, and the breeding safety is ensured. The corresponding number of reactors can be started in time according to different circulating water amounts and water qualities, and the treatment effect is stable. Upgrading of an industrial recirculating aquaculture technology is promoted, the aquaculture density can be effectively improved, and meanwhile pollutants discharged by a seawater recirculating aquaculture system are remarkably reduced.

The invention discloses an industrial intelligent aquaculture system, method, device, medium and product, and relates to the technical field of recirculating aquaculture, the system comprises a recirculating aquaculture infrastructure, a programmable logic controller (PLC), a data transmission unit (DTU), a network video recorder and a server; a water quality sensor group, an environment sensor group, a working condition sensor group, an underwater camera and an overwater camera are arranged, field data of an aquaculture system are acquired through data acquisition equipment, the acquired data are sent to a PLC, the PLC receives the data and then sends the data to a server through a DTU, and the server determines a control decision, such as whether the operation state of each infrastructure is changed or not. The operation states of the devices and how to change are sent to the PLC through the DTU, and the PLC controls the operation states of the devices, so that the operation states of the devices are automatically controlled, and the breeding efficiency of the recirculating aquaculture system is improved.

The utility model provides a babylonia sand-free recirculating aquaculture system which comprises a self-pollution-discharge sand-free aquaculture pond and a low-level water treatment system, aquaculture tail water of the self-pollution-discharge sand-free aquaculture pond automatically flows into the low-level water treatment system to be subjected to particle three-level purification, and then the purified tail water is pumped into the self-pollution-discharge sand-free aquaculture pond through a water pump; babylonia breeding nests for allowing Babylonia to inhabit are arranged in the self-pollution-discharge sand-free breeding ponds, and automatic pollution discharge devices are installed at the bottoms of the self-pollution-discharge sand-free breeding ponds. The low-level water treatment system comprises a particulate matter three-stage removal device and a pipeline type ultraviolet sterilization device which are connected in sequence, and the particulate matter three-stage removal device is composed of a vertical flow sedimentation tank, a foam separation tank and a sand filter tank which are connected in sequence. The utility model effectively solves the problems that the traditional sand flowing water culture is high in water consumption, more in sand matrix dirt accumulation, easy in disease outbreak, incapable of carrying out industrial culture and the like, and has the advantages of high water-saving efficiency, good dirt collecting and discharging effects, controllable culture environment, few diseases, high culture efficiency and the like.

The invention relates to the technical field of aquaculture, and discloses a factory-like circulating aquaculture system and method for aquaculture, and the system comprises one or more aquaculture units, a biological filtration unit and a water circulation filtration unit. Water in the culture ponds in the culture units flows into the microstrainers through independent water outlet pipes at the bottoms of the culture ponds to be primarily filtered, so that suspended particles such as residual feed and excrement in the water are effectively removed (discharged into the sewage pond); particulate matters such as residual feeds and excrement in water bodies are quickly pressed into the microfilters by the aid of high pressure of the water bodies during drainage at the bottoms of the culture ponds, and accordingly the removal efficiency of suspended particles in the water bodies of the culture ponds can be greatly improved; harmful substances such as ammonia nitrogen and nitrite in the water body are removed, the water quality is further improved, and the problems that an existing system is low in suspended particulate matter treatment efficiency, poor in biochemical treatment effect, high in cost, poor in circulation balance and the like are effectively solved.

The application provides a circulating aquaculture system and method, which comprises a high-temperature breeding unit, a low-temperature breeding unit and a circulating heat exchange unit. The circulating heat exchange unit comprises a first heat exchange device and a second heat exchange device. The first heat exchange device is provided with a first heat exchange pipeline, and the second heat exchange device is provided with a second heat exchange pipeline. The first heat exchange pipeline and the second heat exchange pipeline circulate heat exchange medium. The first heat exchange device is connected with the high-temperature breeding unit, so that the first waste liquid in the high-temperature breeding unit exchanges heat with the heat exchange medium. The second heat exchange device is connected with the low-temperature breeding unit, so that the second waste liquid in the low-temperature breeding unit exchanges heat with the heat exchange medium in the second heat exchange pipeline. The application can ensure the breeding temperature in different breeding units, improve the heat utilization rate, and avoid the environmental pollution caused by directly discharging waste liquid by recycling waste water.

This invention belongs to the field of aquaculture equipment and discloses a recirculating aquaculture system for indoor multi-layered culture of freshwater fish germplasm samples. The system includes a stainless steel culture rack, glass culture tanks, a temperature control system, a recirculating water purification system, an aeration system, and electrical and auxiliary materials. Through a three-layered culture structure design, combined with culture tanks of varying sizes and a precise temperature control module, it solves the problem of aquaculture with diverse sizes of freshwater fish germplasm samples and large differences in suitable water temperatures. The system has nine small glass culture tanks in the upper layer and three large glass culture tanks in each of the middle and lower layers, equipped with an external temperature control component and an internal heating rod, achieving full-coverage water temperature regulation from 10℃ to above 30℃. The recirculating water system ensures stable water quality through the synergistic effect of a filter tank, a booster pump, an ultraviolet sterilizer, and various filter media. Meanwhile, the lower culture tanks are equipped with an internal circulation filter to enhance local water purification, meeting the diverse aquaculture needs from small fry to large broodstock.

This invention relates to a filtration device for recirculating aquaculture systems, belonging to the field of aquaculture technology. The filtration device includes a water tank, a connecting plate fixedly connected to one side of the water tank, a filter assembly connected to the water tank and on one side of the top of the connecting plate, and a waste discharge assembly connected to the water tank and on the top of the connecting plate. An oxygen supply assembly is located at the top of the water tank. By using the filter assembly, the first filter tube can be backwashed using a valve, thereby extending the service life of the first filter tube, avoiding frequent replacement, and reducing maintenance costs. The waste discharge assembly discharges the filtered impurities into and onto a discharge plate, effectively concentrating the impurities. The oxygen supply assembly, under the elastic force of a second spring, allows a scraper to clean the inner wall of the water tank, improving the cleaning effect.

The utility model relates to the technical field of leech culture, and discloses a novel leech recirculating aquaculture system which comprises a culture pond, a microfilter used for reducing suspended solids in a water body and reducing the concentration of the suspended solids is arranged on one side of the culture pond, a water storage pond is arranged on one side of the microfilter, and a water pump in the water storage pond pumps water into a decoloration adsorption tank; a pipeline ultraviolet sterilization device for ultraviolet sterilization is arranged on one side of the adsorption tank, a fourth water outlet is formed in the outer wall, away from the water inlet, of the pipeline ultraviolet sterilization device, and a nitrification biological filter tower used for reducing the concentration of ammonia nitrogen and nitrite in water flow is arranged on one side of the pipeline ultraviolet sterilization device. The leech culture device can filter, decolorize, sterilize and biologically filter a red water body with residual food residues (generally pig blood) in water flow, so that the concentration of ammonia nitrogen and nitrite in the water body is reduced, the transparency of the water body is improved, the oxygen concentration of the water body is increased, and the carbon dioxide concentration of the water body is reduced, thereby reducing the risk of leech culture. And the survival rate of leech culture is improved.

The invention provides a novel freshwater fish factory recirculating aquaculture system, which comprises a culture pond, a vertical flow precipitator, a microfilter pond, a biochemical air floatation pond, a sand cylinder filter, a nano denitrification system and a multi-stage air stripping system, the culture pond is respectively connected with the vertical flow precipitator and the microfilter pond, the vertical flow precipitator is connected with the microfilter pond, the biochemical air floatation pond is connected with the sand cylinder filter, the nano denitrification system is connected with the biochemical air floatation pond, and the multi-stage air stripping system is connected with the sand cylinder filter. The biochemical air floatation tank is connected with the microfilter tank through a pipeline, the biochemical air floatation tank comprises an air floatation bin, a pump bin, a biochemical bin and a denitrification bin, and the pump bin is respectively connected with the sand cylinder filter, the nano denitrification system and the multi-stage air stripping system through pipelines; and circulating pumps are arranged on pipelines for connecting the pump bin with the sand cylinder filter, the nano denitrification system and the multi-stage air stripping system. According to the invention, the multi-stage cooperative treatment system is constructed and the denitrification system is introduced, so that the total nitrogen removal rate of the culture system is increased to 96%, which is increased by 140% compared with that of the traditional system, the water supplementing amount of the system is reduced, the daily water supplementing amount is reduced to less than 3%, and the water saving rate of the total amount of circulating water exceeds 70%.

The application relates to the technical field of aquaculture, and discloses a circulating water aquaculture system which comprises an aquaculture area, a filtering area and an adjusting area arranged in sequence; the discharged water in the aquaculture area is discharged into the filtering area for filtration, the filtered water in the filtering area is discharged into the adjusting area, ecological bacteria algae are added into the adjusting area, and the water in the adjusting area is discharged into the aquaculture area after being treated by the ecological bacteria algae. The application can recycle the water and reduce the aquaculture cost.

The invention provides a low-carbon zero-emission factory recirculating aquaculture system, which comprises a processor and a memory, and the processor calls and executes a computer program in the memory, so that a management server determines a first aquaculture area and obtains first real-time aquaculture data of the first aquaculture area; evaluating according to the first real-time breeding data to obtain a breeding difficulty level, determining a first number of second breeding areas according to the breeding difficulty level, and controlling the first breeding area and each second breeding area to be networked based on Internet of Things equipment to obtain breeding data of each second breeding area; the first breeding area uses an environment regulation and control model to predict and calculate the first real-time breeding data and the breeding data to obtain a first environment regulation and control parameter set, and multiple environment parameters in the first breeding area are adjusted according to the first environment regulation and control parameter set. According to the invention, which second breeding areas should be networked can be determined according to the actual situation of the first breeding area.

The invention relates to an integrated water treatment filter for a recirculating aquaculture system and a filtering method, and belongs to the field of water treatment. The device comprises a biological filtration unit and a physical filtration unit, and is structurally characterized in that the physical filtration unit is located in the biological filtration unit, and the physical filtration unit is located at the upper end of the biological filtration unit; the physical filtering unit is located in the biological filtering unit, and the physical filtering unit is located at the upper end of the biological filtering unit; the physical filtering unit comprises a bead intercepting net, a filtering barrel, a back washing spraying device and floating bead filler, the bead intercepting net is arranged at the top of the filtering barrel, the back washing spraying device is located in the filtering barrel, the floating bead filler is arranged in the filtering barrel, and the back washing spraying device is located in the filtering barrel. The biological filtration unit comprises a barrel body, an aeration device and a high-specific-surface-area filler, the filtration barrel, the aeration device and the high-specific-surface-area filler are all located in the barrel body, and the aeration device is located at the bottom of the barrel body.

An integrated biofilter for a re-circulating aquaculture system is provided. The biofilter may include a moving bed biofilm reactor (MBBR) with biomedia elements configured to support bacteria growth and nitrification of the wastewater and an MBBR output configured to output biomass generated by the bacteria. The biofilter may also comprise a periphyton biofilter configured to introduce oxygen into the wastewater, and a halophyte biofilter comprising a plurality of plants. The halophyte biofilter configured to capture nutrients in the wastewater to generate edible plant mass.

A recirculating aquaculture system for producing aquatic species suitable for human consumption includes: a culture tank providing habitat for a selected aquatic species; a plurality of subsystems in communication with the culture tank and configured to recirculate and treat water within the system, the plurality of subsystems comprising: a solids control subsystem for removing particulates in the water, a recirculating pump subsystem for recirculating water within the system, an aeration / stripping subsystem for contacting air and water to strip carbon dioxide out of the water and into the air, a pH control subsystem to maintain the alkalinity of the water, an oxygenation subsystem for providing oxygen to the water, and an optional ozonation subsystem for providing ozone to the water; and wherein the water comprises iron cations at a concentration of at least about 0.1 ppm. Methods of maintaining the recirculating aquaculture system are also described.

This invention provides a coupled recirculating aquaculture system and method. The coupled recirculating aquaculture system includes: an aquaculture pond for aquaculture, with a central suspended solids drain pipe and a water-pushing device inside; a denitrification unit whose inlet is connected to the central suspended solids drain pipe and whose outlet is connected to the water-pushing device, the denitrification unit denitrifies the water and returns the denitrified water to the aquaculture pond via the water-pushing device; and a carbon-nitrogen ratio coordination unit connected between the water-pushing device and the denitrification unit, which adjusts the content of growth elements in the water entering the aquaculture pond according to changes in the growth elements required by the aquatic products, and simultaneously sends the water discharged from the denitrification unit into the aquaculture pond via the water-pushing device. The denitrification unit effectively removes ammonia nitrogen from the water in the aquaculture pond, ensuring the lifespan of the aquatic products and reducing the area of ​​the coupled recirculating aquaculture system.

The invention belongs to the technical field of fishery breeding, particularly relates to a retired oil and gas platform fishery function transfer modular detachable circulating breeding system, and aims to solve the problems that when existing breeding equipment is used, due to the fact that semi-arc-shaped plates are in a fixed connection state, if one semi-arc-shaped plate is damaged during use, the whole body needs to be replaced, and the cost is low. The situation of waste of resources and the like is easily caused, so that the use has relatively strong limitation; comprising a bottom plate, and the bottom plate is connected with a side moving semi-arc-shaped plate through a dismounting and fixing translation mechanism; a rotating bearing is mounted on the bottom plate, a rotating shaft is mounted on the rotating bearing, one end of the rotating shaft is connected with the locking anti-contact unit, and the other end of the rotating shaft is connected with the rotating square moving mechanism; and by disassembling and fixing the translation mechanism, the side-moving semi-arc-shaped plates are prevented from shaking, the installation efficiency and the overall connection stability of the four side-moving semi-arc-shaped plates are improved, and the limitation of the device in use is reduced.

This invention discloses a filtration device and a method for maintaining filtration in recirculating aquaculture systems, relating to the field of recirculating aquaculture technology. The filtration device includes a pool body, a frame, a blocking component, and a detection component. The frame is detachably mounted within the pool body and has four accommodating spaces along its height, each accommodating space containing at least one filter bag. The blocking component is located between the frame and the pool body, preventing pool water from flowing downwards without passing through the filter bag. The detection component includes a first detection element, a second detection element, a control module, and an alarm module. The first detection element is located at the end of the frame furthest from the bottom of the pool body, and the second detection element is located at the end of the frame closest to the bottom of the pool body. The control module is communicatively connected to the first detection element, the second detection element, and the alarm module.

The invention provides a lightweight dead fish detection method and device for a recirculating aquaculture system, and the method comprises the steps: obtaining a monitoring video stream of the recirculating aquaculture system, and constructing an image data set; performing labeling and data enhancement preprocessing on the data set to obtain a training set; a training set is used for training a lightweight dead fish detection model, the model is based on a YOLOv8 architecture, a feature extraction network uses a Light UIB-SAM module fusing an inverted bottleneck structure and a SimAM attention mechanism, a feature fusion network integrates a global-local interactive feature fusion module, and a detection head introduces a deep separable residual fusion module; and inputting a to-be-detected image into the trained model and outputting a detection result. Through cooperative improvement of the three core modules, the model parameter quantity and the calculation complexity are remarkably reduced while the high detection precision is kept, and the optimal balance between the detection precision and the reasoning speed is achieved.

This invention discloses a pond recirculating aquaculture system, proposing an innovative design scheme that applies a high-efficiency waste collection recirculating aquaculture unit to a novel intensive recirculating aquaculture pond, providing a new design approach for constructing an "energy-saving, emission-reducing, ecological, and efficient" intensive pond recirculating aquaculture system. The system adopts a design concept combining factory-style high-density aquaculture units with a pond recirculating aquaculture model. Through a combination of a bidirectional jet-type inlet pipe and a waterwheel-type aerator, as well as a dual-channel waste collection device, it achieves efficient waste collection, oxygenation, and water purification. Furthermore, this system introduces a centrally controlled automatic feeding system, a solar-powered water quality monitoring system, and an integrated water purification process combining physical filtration, flocculation, and aquatic plant / animal purification technologies, contributing to the formation of an "energy-saving, water-saving, and land-saving" pond recirculating aquaculture model.

This utility model relates to the field of juvenile acclimatization pond technology, specifically a juvenile acclimatization pond for mandarin fish based on a recirculating aquaculture system. The pond includes a circular body with a fish inlet fixedly connected to the top of its side wall. This fish inlet is connected to the opening pond via a pipe. The advantages of this utility model are: the circular pond structure combined with a central drain outlet at the bottom allows for rapid and directional discharge of pollutants such as uneaten feed and feces, effectively reducing the entry of large particulate pollutants into the recirculating water treatment system and lowering energy consumption. The unique fish inlet design allows mandarin fish juveniles to be automatically transferred from the opening pond to the acclimatization pond via water flow guidance, avoiding mechanical damage and stress caused by manual harvesting and significantly reducing juvenile loss. The annular spray jet design simulates a natural feeding environment through regular water flow stimulation, successfully establishing a conditioned reflex feeding mechanism in the mandarin fish juveniles, increasing the acclimatization success rate to over 85%.

The present application relates to a kind of circulating water aquaculture system of petrosiidae and use method.Pertains to the aquaculture technical field of petrosiidae, including petrosiidae aquaculture box, the petrosiidae aquaculture box is placed in the placement cavity of aquaculture frame, the petrosiidae aquaculture box includes aquaculture groove and aquaculture cover plate, the aquaculture groove includes shelter area, slope area and inner bottom, the shelter area is at high position and is provided with shelter baffle, the inner bottom is at low position, the slope area is connected shelter area and inner bottom and has preset inclination, the inner bottom of the aquaculture groove is provided with water outlet, water outlet is connected with circulating water system, the output end of the circulating water system is in the form of spray and is output to the upper of petrosiidae aquaculture box.The present application provides the habitat and growth space of simulating natural environment for petrosiidae, and it is conducive to its healthy growth.Circulating water system ensures the excellent and recycling of water quality by the synergistic effect of each processing device, and reduces the cost of aquaculture.

Provided are an intelligent feeding method and system for fish in a recirculating aquaculture system based on repeated games. The method includes: constructing repeated games, determining Nash equilibrium strategies based on the repeated games, determining a payoff relationship between different strategies in a research phase, and quantifying a hunger level and determining a feeding amount based on the payoff relationship as well as an intrinsic connection between hunger levels and energy intake and expenditure in fish group feeding behavior. This application uses a simple and effective repeated game method to determine the feeding amount that promotes cooperative swimming feeding behavior in the fish group, effectively reducing feed waste caused by the existing method of determining the feeding amount based on total fish biomass and farming experience. This application ensures sufficient energy supply for fish growth while promoting cooperative swimming feeding behavior among individual fish in the group.

A method for preparing encapsulated particles for a recirculating aquaculture system (RAS) and the RAS system itself are disclosed. The method includes: mixing aquaculture wastewater containing chemical drugs and drug-resistant denitrifying microorganisms with a powdered additive to enrich the bacterial source; obtaining a solid-liquid mixture through solid-liquid separation; mixing the mixture with a prepolymer and water in a specific ratio, adding an initiator to crosslink and form a polymeric gel block; and cutting the mixture to obtain encapsulated particles. The system includes an aquaculture tank, a circulation pipeline, a pretreatment unit, a tubular denitrification reactor, and an aeration unit. The pretreatment unit is used to enrich and separate the bacterial source, and the tubular denitrification reactor is filled with the aforementioned encapsulated particles to achieve denitrification. This invention directly utilizes the system's own wastewater to prepare encapsulated particles, exhibiting strong bacterial source adaptability, low cost, and good drug tolerance and mass transfer efficiency. It effectively improves denitrification stability and system operation continuity, and is suitable for wastewater treatment in RAS systems.

The invention relates to a Babylonia areolata multilayer three-dimensional recirculating aquaculture system and a use method, and relates to the technical field of Babylonia areolata industrial aquaculture, the Babylonia areolata multilayer three-dimensional recirculating aquaculture system comprises an aquaculture box group, a system support, a recirculating aquaculture system, a water distribution pipe, an aquaculture basket and a gauze element, one end of the breeding box group is connected with the output end of the circulating water breeding system through a water inlet pipe, the other end of the breeding box group is connected with the input end of the circulating water breeding system through a water return pipe, a breeding basket is arranged in each breeding box, a gauze element is arranged in each breeding basket, and breeding babylonia and a substrate are arranged on the gauze elements; the water distribution pipe is connected with the water inlet pipe and arranged below the breeding basket. The space utilization rate and the unit yield of Babylonia areolata industrial aquaculture are greatly improved. And collection of cultivated snails is greatly facilitated.

The invention relates to the technical field, in particular to a method for improving nutrient absorption efficiency of juvenile mandarin fish, which comprises the following steps: selecting healthy juvenile mandarin fish with average body mass of 30 + / -1g, body length of 11 + / -1cm and no vaccine injection and antibiotic use records, temporarily culturing the juvenile mandarin fish in an efficient circulating water culture system for 7 days, the method comprises the following steps: feeding mandarin fish with basic feed during temporary rearing, carrying out hydrogen filling treatment on a culture water body for 1 hour, 2 hours or 3 hours after 2 hours of feeding the feed at 6: 00 every day, namely 8: 00 every day, so that the hydrogen concentration in the water body reaches 200-320 ppb, and monitoring a water quality index at the same time. The deposition rate and the absorption efficiency of the juvenile mandarin fish on nutrient substances such as protein and fat are remarkably improved, an effective technical scheme is provided for solving the problem of nutrient absorption in feed mandarin fish culture, and remarkable economic benefits and ecological values are achieved.