Marine ranch carbon sink breeding device and method

Abstract

The invention discloses a marine ranch carbon sink breeding device and method, and belongs to the technical field of marine fishery. Wherein the culture device adopts a modular design of combining vertical layering and horizontal partitioning, and comprises an upper-layer algae culture module, a middle-layer fish culture module, a bottom-layer shellfish culture module and a seabed carbon deposition auxiliary module, and all the modules can be flexibly combined according to the sea environment. Breeding parameters are regulated and controlled in real time through the intelligent monitoring system, and efficient fixation and storage of carbon dioxide are achieved through the biological carbon fixation principle. The breeding method comprises the whole process of site selection, module assembling and putting, ecological regulation and control and carbon sink metering. The system has a carbon sink function and fishery output benefits, solves the problems of ecological imbalance and difficult carbon sink metering of a traditional breeding mode, and provides a standardized and intelligent solution for marine ranch carbon sink breeding.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of marine fisheries, and particularly relates to a marine ranching carbon sink cultivation device and method. BACKGROUND

[0002] The marine ranching carbon sink cultivation mode is an innovative paradigm that deeply integrates ecological protection and industrial development. Its core lies in relying on an artificially constructed marine three-dimensional ecological system to achieve the synergistic gain of fishery economy and carbon sink function through scientific and systematic cultivation layout. This mode takes large algae (such as kelp, undaria pinnatifida, giant kelp, etc.) as the main force of carbon sink, utilizes its efficient photosynthesis mechanism to convert carbon dioxide in the atmosphere into organic carbon and rapidly accumulates, and at the same time, it is matched with filter-feeding shellfish such as oysters and scallops, which convert phytoplankton and organic carbon in seawater into shell calcium carbonate and soft tissue carbon through biological filter-feeding process. After the death of the organism, the remains sink to the seabed to form long-term carbon storage. It is supplemented by the ecological cultivation of salmon and large yellow croaker, and the excretion and leftover feed of fish can provide nutrients for the growth of algae, forming a closed ecological chain of "algal carbon fixation-behavior transformation-fish symbiosis".

[0003] In recent years, with the rapid development of marine ranching industry, the carbon sink function of China's marine ranching has developed to some extent. However, the carbon sink function of China's marine ranching still faces many challenges, such as high cultivation density, unreasonable cultivation structure, and deterioration of ecological environment. These problems lead to the intensification of the fragmentation of the marine ranching ecosystem and the reduction of the implementation efficiency of the carbon sink function. Therefore, how to optimize the cultivation layout and management measures of the marine ranching and improve the stability and anti-interference ability of the ecological system is an important issue for the development of the marine ranching.

[0004] In order to better develop the marine ranching carbon sink cultivation mode, it is necessary to further improve the corresponding cultivation equipment. For example, the prior art CN 120226632 A proposes a deep-sea self-circulation movable three-dimensional cultivation net cage culture system, which includes a net cage that can float, sink or move in the sea, and includes a cultivation platform, a fish cultivation system, a shellfish cultivation system and an algae cultivation system. The system integrates the fish cultivation system, the shellfish cultivation system and the algae cultivation system together as a new cooperative cultivation mode.

[0005] However, the above cultivation system lacks intelligent monitoring function and cannot monitor the cultivation density and cultivation environment parameters in real time, so it cannot adjust the cultivation scheme according to the actual situation, which has a great impact on the marine ranching carbon sink cultivation mode. SUMMARY

[0006] The present application aims to provide a mariculture carbon sink cultivation device and method, which realizes flexible configuration of the cultivation device through modular design, combines intelligent monitoring and precise control technology, improves the carbon sink efficiency and fishery output benefit of the mariculture, and solves the ecological and technical problems of the lack of intelligent monitoring function of the existing cultivation system and the traditional cultivation mode.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0008] The present application provides a mariculture carbon sink cultivation device, which comprises:

[0009] The upper algal cultivation module comprises a flexible cultivation raft frame that can float and a plurality of algal attachment bases that are arranged at intervals below the flexible cultivation raft frame.

[0010] The middle fish cultivation module is arranged below the algal attachment bases and comprises a fish cultivation net cage, wherein the fish cultivation net cage is connected to the flexible cultivation raft frame through a connecting piece.

[0011] The bottom shellfish cultivation module is arranged below the fish cultivation net cage and comprises a seabed fixing frame and a shellfish hanging cultivation net cage, wherein the seabed fixing frame is installed on the seabed plane, and the shellfish hanging cultivation net cage is hung on the seabed fixing frame through a connecting rope.

[0012] The seabed carbon deposition auxiliary module is arranged on the seabed plane and comprises a plurality of artificial reefs that are arranged around the seabed fixing frame, wherein the artificial reefs are of a multi-porous, hollow and multi-layer structure.

[0013] The intelligent monitoring system comprises a temperature sensor, a dissolved oxygen sensor, a carbon dioxide concentration sensor, a pH value sensor, a fish school activity monitoring device, a controller and a monitoring terminal, wherein the upper algal cultivation module, the middle fish cultivation module and the bottom shellfish cultivation module are each provided with a temperature sensor, a dissolved oxygen sensor, a carbon dioxide concentration sensor and a pH value sensor; the fish school activity monitoring device is arranged in the fish cultivation net cage and comprises a sonar detector; the temperature sensor, the dissolved oxygen sensor, the carbon dioxide concentration sensor, the pH value sensor and the fish school activity monitoring device are connected to the controller, and the controller is connected to the monitoring terminal.

[0014] Further, the flexible cultivation raft frame is a square frame made of high-strength corrosion-resistant material, the surface of which is coated with an antifouling coating, and a plurality of floating balls are arranged thereon.

[0015] Further, the algal attachment base is of a grid structure, and the top of the algal attachment base is connected to the flexible cultivation raft frame.

[0016] Further, the bottom of the fish cultivation net cage is connected to the seabed fixing frame through a fixing rope.

[0017] Further, the specific surface area of the artificial reef is 5-10 square meters per cubic meter, and the material is concrete or basalt.

[0018] Further, the intelligent monitoring system further comprises an underwater inspection robot with a camera, and the underwater inspection robot is wirelessly connected with the controller.

[0019] The application further provides a marine ranching carbon sink cultivation method, which uses the marine ranching carbon sink cultivation device to cultivate algae, fish and shellfish in a three-dimensional manner, and comprises the following steps:

[0020] Step 1: site selection, comprehensive evaluation of sea environment conditions, selection of suitable cultivation areas, the sea environment conditions include water quality, water depth, illumination, ocean current;

[0021] Step 2: module assembly and launching, the upper algae cultivation module, the middle fish cultivation module, the bottom shellfish cultivation module and the seabed carbon deposition auxiliary module are assembled and launched according to the design scheme;

[0022] Step 3: ecological regulation, real-time acquisition of cultivation environment parameters through the intelligent monitoring system, adjustment of cultivation density and nutrient supply according to the biological growth state;

[0023] Step 4: carbon sink measurement, accounting of the carbon fixation of algae biomass, the calcification carbon fixation of shellfish and the seabed carbon deposition amount.

[0024] Further, in step 1, a shallow water area with clean water quality, moderate nitrogen and phosphorus content, pH value between 7.8 and 8.3 and water depth not more than 20 meters is selected as the algae cultivation area, and the water depth of the bottom shellfish cultivation area can be extended to 50 meters.

[0025] Further, in step 3, the intelligent monitoring system further comprises an algae monitoring sensor for monitoring the algae biomass, and the algae monitoring sensor is connected with the controller; when the algae monitoring sensor monitors that the algae biomass exceeds 500 grams per cubic meter, the controller generates an alarm and sends it to the monitoring terminal, and notifies the staff to start mechanical harvesting or release algae control organisms; when the PH value sensor monitors that the water body acidification is enhanced, the controller generates an alarm and sends it to the monitoring terminal, and notifies the staff to release the limestone slow-release device through the seabed carbon deposition auxiliary module to adjust the water body pH value.

[0026] Further, in step 4, for the carbon fixation of algae biomass, the area of the algae field is estimated through satellite remote sensing, and the carbon fixation of algae biomass is calculated by combining the measured dry weight of algae biomass; for the calcification carbon fixation of shellfish, the HCO is labeled by using the isotope tracing technology, and the calcification carbon fixation amount of shellfish is measured by combining the shell growth rate; for the seabed carbon deposition amount, the dynamic change of the seabed carbon sink is determined by sediment column sampling and carbon isotope analysis.

[0027] By adopting the technical scheme, the present application has the following beneficial effects:

[0028] 1. The present application has a complete ecological cycle chain by the layered design of the upper algal cultivation module, the middle fish cultivation module and the bottom shellfish cultivation module. Fish excrement and leftover feed provide nutrients for the growth of algae. Shellfish filter phytoplankton, reducing the risk of water eutrophication and effectively improving the marine ecological environment. The modular design allows the cultivation device to be flexibly combined according to different sea environment and cultivation needs, which is suitable for various types of marine ranching construction around the world, improving the versatility of the system.

[0029] 2. The present application has the advantage of high carbon sink efficiency. Through three-dimensional layered cultivation and ecological chain construction, the synergistic effect of algal photosynthesis carbon fixation, shellfish calcification carbon fixation and seabed carbon deposition is fully utilized, significantly improving the carbon sink capacity of the marine ranching, and the annual carbon fixation per hectare is expected to reach hundreds to thousands of tons of CO equivalent.

[0030] 3. The intelligent monitoring system of the present application works cooperatively through multiple sensors to collect environmental parameters such as temperature, dissolved oxygen and pH value in real time, which can realize real-time monitoring and precise control of the cultivation environment parameters, reduce the cost of manual management, and reduce the risk of cultivation caused by environmental fluctuations, improving the stability of fishery output.

[0031] 4. The present application avoids ecological problems caused by high cultivation density through real-time regulation of cultivation density by the intelligent monitoring system, maintains the balance of the ecological system and ensures the sustainable development of the marine ranching. In addition, the intelligent monitoring system is also equipped with an underwater inspection robot, which can conduct comprehensive inspection of the cultivation area, timely find problems such as cultivation device failure and biological disease, realize early warning, and ensure the stable operation of the cultivation system.

[0032] 5. The present application uses multiple advanced technologies for carbon sink measurement, realizes scientific accounting of carbon sink amount, makes the data accurate and authoritative, provides reliable basis for carbon sink trading and ecological benefit evaluation, provides standardized method for quantitative evaluation of carbon sink benefit of marine ranching, helps the standardized development of marine carbon sink industry, and promotes the marketization development of marine carbon sink resources.

[0033] 6. The flexible cultivation raft of the present application is made of high-strength corrosion-resistant material and coated with an antifouling coating, and is designed with a floating ball, which not only enhances the service life and stability of the raft, but also adapts to complex sea conditions, reduces the probability of damage to the device due to harsh environment, and reduces maintenance cost.

[0034] 7. In this invention, the bottom of the fish farming cage is connected to the seabed fixing frame by a fixing rope. The flexible farming raft frame is combined with a buoy design to form a stable structure of "floating on top and fixed at the bottom", which can resist strong ocean currents and typhoons and other severe weather, and ensure the overall stability of the device under complex sea conditions.

[0035] 8. The seabed carbon deposition auxiliary module set up in this invention, with its porous, hollow, multi-layered artificial reef, not only provides habitat for marine life and promotes biodiversity, but also effectively increases the seabed carbon deposition area and enhances the carbon sink effect.

[0036] 9. The present invention enables precise site selection and stratified setting of aquaculture areas in the aquaculture method, making full use of environmental resources in different water layers, improving the utilization rate of marine space, and maximizing output per unit area.

[0037] 10. The present invention provides a monitoring and regulation mechanism for changes in water pH, which can promptly address the problem of ocean acidification, create a suitable living environment for cultured organisms, and improve the survival rate and quality of cultured organisms. Attached Figure Description

[0038] Fig. 1 This is a schematic diagram of the structure of the marine ranching carbon sink aquaculture device provided by the present invention;

[0039] Fig. 2 This is a block diagram of the intelligent monitoring system provided by the present invention;

[0040] The labels in the attached diagram are: 1-flexible aquaculture raft, 2-buoy, 3-algae attachment substrate, 4-fish farming cage, 5-connector, 6-fixing rope, 7-seabed fixing frame, 8-connecting rope, 9-shellfish hanging farming cage, 10-artificial reef, 11-seabed surface. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figs. 1-2As shown, this invention proposes a marine ranching carbon sink aquaculture device, comprising an upper-layer algae cultivation module, a mid-layer fish cultivation module, a bottom-layer shellfish cultivation module, a seabed carbon deposition auxiliary module, and an intelligent monitoring system. The upper-layer algae cultivation module is used for cultivating large algae, the mid-layer fish cultivation module for cultivating filter-feeding fish, and the bottom-layer shellfish cultivation module for cultivating shellfish. The seabed carbon deposition auxiliary module is used to promote seabed carbon deposition. The intelligent monitoring system is used to monitor the aquaculture environmental parameters of each module in real time.

[0044] The upper algae cultivation module includes a floating flexible cultivation raft 1 and several algae attachment substrates 3 spaced apart below the flexible cultivation raft 1. The flexible cultivation raft 1 is designed to withstand wind and waves and is equipped with several buoys 2. The raft 1 floats through the buoys 2 and can automatically adjust its height according to tidal changes to avoid damage caused by wind and waves.

[0045] The flexible aquaculture raft 1 is a square frame made of high-strength, corrosion-resistant material, with a surface coated with an anti-fouling coating that effectively prevents the attachment of organisms such as barnacles. In this embodiment, the flexible aquaculture raft 1 is made of plastic, and the algae attachment substrate 3 has a mesh structure with its top and opposite sides connected to the flexible aquaculture raft 1. The mesh structure increases the algae attachment area and promotes photosynthetic carbon fixation.

[0046] The flexible aquaculture raft frame 1 of the present invention is made of high-strength corrosion-resistant material and coated with antifouling coating. Combined with the design of float 2, it not only enhances the service life and stability of the raft frame, but also adapts to complex sea conditions, reduces the probability of the device being damaged by harsh environments, and lowers maintenance costs.

[0047] The mid-level fish farming module is located below the algae attachment substrate 3 and includes fish farming cages 4, which are connected to the flexible farming raft 1 via connectors 5. In this embodiment, the connector 5 is a suspension rope. Multiple fish farming cages 4 can be installed, and channels can be provided between adjacent fish farming cages 4. The channels are equipped with valves, which can be electric gates. An appropriate number of fish farming cages 4 can be selected according to the growth of the fish to adjust the fish density, avoid overcrowding, and ensure ecosystem balance.

[0048] The bottom-level shellfish aquaculture module is located below the fish aquaculture cage 4. It includes a seabed anchoring frame 7 and a suspended shellfish aquaculture cage 9. The seabed anchoring frame 7 is installed on the seabed surface 11, and the suspended shellfish aquaculture cage 9 is suspended from the seabed anchoring frame 7 by connecting ropes 8. In this embodiment, the bottom of the seabed anchoring frame 7 is provided with a pointed tip, which is directly inserted into the seabed surface 11 for anchoring, ensuring stability under complex sea conditions. The height of the suspended shellfish aquaculture cage is adjustable to adapt to the growth needs of different shellfish.

[0049] Furthermore, the bottom of the fish farming cage 4 is connected to the seabed fixing frame 7 via a fixing rope 6, improving stability. In this invention, the bottom of the fish farming cage 4 is connected to the seabed fixing frame 7 via a fixing rope 6, and the flexible farming raft frame 1, combined with the buoy 2, forms a stable "floating on top and fixed at the bottom" structure, which can withstand strong ocean currents and typhoons and other severe weather, ensuring the overall stability of the device under complex sea conditions.

[0050] The seabed carbon deposition auxiliary module is set on the seabed plane 11, and includes several artificial reefs 10 surrounding the seabed fixing frame 7. The artificial reefs 10 have a porous, hollow, multi-layered structure. The specific surface area of ​​the artificial reefs 10 is 5-10 square meters per cubic meter, and the material is concrete or basalt, exhibiting good durability and eco-friendliness. In this embodiment, the specific surface area of ​​the artificial reefs 10 is 8 square meters per cubic meter, and the material is basalt. The seabed carbon deposition auxiliary module, employing porous, hollow, multi-layered artificial reefs 10, not only provides habitats for marine life and promotes biodiversity, but also effectively increases the seabed carbon deposition area and enhances carbon sequestration.

[0051] The intelligent monitoring system includes temperature sensors, dissolved oxygen sensors, carbon dioxide concentration sensors, pH sensors, fish activity monitoring devices, a controller, and a monitoring terminal. Temperature sensors, dissolved oxygen sensors, carbon dioxide concentration sensors, and pH sensors are correspondingly installed in the upper algae cultivation module, the middle-layer fish cultivation module, and the bottom shellfish cultivation module. The fish activity monitoring device, which includes a sonar detector, is installed inside the fish cultivation cage 4 and monitors fish density and activity range in real time. The temperature sensors, dissolved oxygen sensors, carbon dioxide concentration sensors, pH sensors, and fish activity monitoring devices are all connected to the controller, which is connected to the monitoring terminal. In addition, the intelligent monitoring system also includes an underwater inspection robot with a camera and an algae monitoring sensor for monitoring algae biomass; both the underwater inspection robot and the algae monitoring sensor are connected to the controller.

[0052] The intelligent monitoring system uses multiple sensors to work together to collect environmental parameters such as temperature, dissolved oxygen, and pH in real time. This enables real-time monitoring and precise control of aquaculture environmental parameters, reducing manual management costs, minimizing aquaculture risks caused by environmental fluctuations, and improving the stability of fishery output.

[0053] The present invention also proposes a method for carbon sequestration aquaculture in marine ranching, which uses the above-mentioned marine ranching carbon sequestration aquaculture device to carry out three-dimensional aquaculture of algae, fish and shellfish, including steps 1-4.

[0054] Step 1: Site Selection. A comprehensive assessment of the marine environmental conditions is conducted to select a suitable aquaculture area. These conditions include water quality, depth, sunlight, and ocean currents. Specifically, shallow water areas with clean water, moderate nitrogen and phosphorus content, a pH between 7.8 and 8.3, and a depth not exceeding 20 meters are selected for algae cultivation. Bottom-dwelling shellfish cultivation areas can extend to depths of up to 50 meters to ensure the needs of different organisms are met. Furthermore, considering the synergistic effect of the marine environment, areas with strong natural carbon sequestration capabilities, such as estuaries and upwelling zones, are selected, or areas are linked to ecological projects such as offshore wind power and coastal wetlands.

[0055] This invention, through precise site selection and stratified layout of aquaculture areas, makes full use of environmental resources in different water layers, improves the utilization rate of marine space, and maximizes output per unit area.

[0056] Step 2, Module Assembly and Deployment: Assemble and deploy the upper algae cultivation module, the middle fish cultivation module, the bottom shellfish cultivation module, and the seabed carbon deposition auxiliary module according to the design plan.

[0057] Step 3, Ecological Regulation: Real-time monitoring of aquaculture environment parameters is obtained through an intelligent monitoring system, and the stocking density and nutrient supply are adjusted according to the growth status of the organisms. When the algae monitoring sensor detects that the algae biomass exceeds 500 g / m³, the controller generates an alarm and sends it to the monitoring terminal, notifying staff to initiate mechanical harvesting or release algae-controlling organisms to prevent excessive algae growth.

[0058] When the pH sensor detects increased acidity in the water, the controller generates an alarm and sends it to the monitoring terminal, notifying staff to deploy a limestone slow-release device through the seabed carbon deposition auxiliary module to adjust the water's pH, neutralize the acidity, and ensure the shellfish's calcification ability.

[0059] At the same time, the stocking density is adjusted based on fish activity monitoring data to maintain the balance of the ecosystem.

[0060] Step 4: Carbon Sequestration Measurement: This step involves calculating carbon sequestration from algal biomass, shellfish calcification, and seabed carbon deposition. Specifically, for algal biomass carbon sequestration, the area of ​​algal blooms is estimated using satellite remote sensing, and algal biomass carbon sequestration is calculated by combining this with on-site sampling and measurement of algal dry weight. For shellfish calcification carbon sequestration, isotope tracing technology is used to label HCO3-, and the amount of shellfish calcification carbon sequestration is measured by combining this with shell growth rate measurements. For seabed carbon deposition, the dynamic changes in the seabed carbon pool are determined through sediment column sampling and carbon isotope analysis.

[0061] This invention employs a variety of advanced technologies for carbon sequestration measurement, enabling scientific accounting of carbon sequestration amounts. This results in accurate and authoritative data, providing a reliable basis for carbon trading and ecological benefit assessment. It also provides a standardized method for the quantitative assessment of carbon sequestration benefits in marine ranches, contributing to the standardized development of the marine carbon sequestration industry and promoting the market-oriented development of marine carbon sequestration resources.

[0062] This invention constructs a complete ecological cycle chain through a layered design consisting of an upper algae cultivation module, a middle-layer fish cultivation module, and a bottom-layer shellfish cultivation module. Fish excrement and uneaten feed provide nutrients for algae growth, while shellfish filter-feed phytoplankton, reducing the risk of eutrophication and effectively improving the marine ecological environment. The modular design allows for flexible combination of the cultivation equipment according to different marine environments and cultivation needs, making it suitable for various types of marine ranches worldwide and improving the system's versatility. Through three-dimensional layered cultivation and ecological chain construction, this invention fully leverages the synergistic effects of algal photosynthetic carbon sequestration, shellfish calcification carbon sequestration, and seabed carbon deposition, significantly enhancing the carbon sequestration capacity of marine ranches. It is estimated that the annual carbon sequestration per hectare can reach hundreds to thousands of tons of CO2 equivalent.

[0063] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A marine ranching carbon sequestration aquaculture device, characterized in that, include: The upper algae cultivation module includes a floating flexible cultivation raft and several algae attachment substrates spaced apart below the flexible cultivation raft. A mid-level fish farming module is located below the algae attachment substrate and includes a fish farming net cage, which is connected to the flexible farming raft via connectors. The bottom shellfish farming module is located below the fish farming cages. It includes a seabed support frame and a shellfish hanging cage. The seabed support frame is installed on the seabed surface, and the shellfish hanging cage is suspended on the seabed support frame by connecting ropes. A seabed carbon deposition auxiliary module is set on the seabed surface and includes several artificial reefs arranged around a seabed fixing frame. The artificial reefs are porous, hollow, and multi-layered structures. The intelligent monitoring system includes a temperature sensor, a dissolved oxygen sensor, a carbon dioxide concentration sensor, a pH sensor, a fish activity monitoring device, a controller, and a monitoring terminal. The upper algae cultivation module, the middle fish cultivation module, and the bottom shellfish cultivation module are each equipped with a corresponding temperature sensor, dissolved oxygen sensor, carbon dioxide concentration sensor, and pH sensor. The fish activity monitoring device is installed inside the fish farming cages and includes a sonar detector. The temperature sensor, dissolved oxygen sensor, carbon dioxide concentration sensor, pH sensor, and fish activity monitoring device are all connected to the controller, which is connected to the monitoring terminal.

2. The marine ranching carbon sequestration aquaculture device according to claim 1, characterized in that: The flexible aquaculture raft is a square frame made of high-strength, corrosion-resistant material, coated with an anti-fouling coating, and equipped with several floats.

3. The marine ranching carbon sequestration aquaculture device according to claim 1, characterized in that: The algae attachment substrate has a mesh-like structure, with its top two sides connected to the flexible aquaculture raft.

4. A marine ranching carbon sequestration aquaculture device according to claim 1, characterized in that: The bottom of the fish farming cage is connected to the seabed support frame by a fixing rope.

5. A marine ranching carbon sequestration aquaculture device according to claim 1, characterized in that: The artificial reef has a specific surface area of ​​5-10 square meters per cubic meter and is made of concrete or basalt.

6. A marine ranching carbon sequestration aquaculture device according to claim 1, characterized in that: The intelligent monitoring system also includes an underwater inspection robot equipped with a camera, which is wirelessly connected to the controller.

7. A method for carbon sequestration aquaculture in marine ranching, characterized in that: This method uses the marine ranching carbon sink aquaculture device according to any one of claims 1-6 for three-dimensional aquaculture of algae, fish, and shellfish, and includes the following steps: Step 1, Site Selection: Comprehensively assess marine environmental conditions and select a suitable aquaculture area. The marine environmental conditions include water quality, water depth, sunlight, and ocean currents. Step 2, Module Assembly and Deployment: Assemble and deploy the upper algae cultivation module, the middle fish cultivation module, the bottom shellfish cultivation module, and the seabed carbon deposition auxiliary module according to the design plan; Step 3, Ecological Regulation: Real-time monitoring of aquaculture environment parameters is obtained through an intelligent monitoring system, and the stocking density and nutrient supply are adjusted according to the growth status of organisms; Step 4, Carbon Sequestration Measurement: Calculate the carbon sequestration by algal biomass, carbon sequestration by shellfish calcification, and carbon deposition on the seabed.

8. A method for marine ranching carbon sink aquaculture according to claim 7, characterized in that: In step 1, shallow water areas with clean water quality, moderate nitrogen and phosphorus content, pH value between 7.8 and 8.3, and a water depth of no more than 20 meters are selected as algae cultivation areas, while the bottom shellfish cultivation areas can be extended to a depth of 50 meters.

9. A method for marine ranching carbon sink aquaculture according to claim 8, characterized in that: In step 3, the intelligent monitoring system also includes an algae monitoring sensor for monitoring algae biomass. The algae monitoring sensor is connected to the controller. When the algae monitoring sensor detects that the algae biomass exceeds 500 g / m³, the controller generates an alarm and sends it to the monitoring terminal to notify the staff to start mechanical harvesting or release algae-controlling organisms. When the pH sensor detects that the water acidity is increasing, the controller generates an alarm and sends it to the monitoring terminal to notify the staff to release a limestone slow-release device through the seabed carbon deposition auxiliary module to adjust the pH of the water.

10. A method for marine ranching carbon sink aquaculture according to claim 9, characterized in that: In step 4, for algal biomass carbon fixation, the area of ​​the algal field is estimated by satellite remote sensing, and the algal biomass carbon fixation is calculated by combining the dry weight of algae obtained by field sampling; for shellfish calcification carbon fixation, HCO3 is labeled by isotope tracing technology, and the amount of shellfish calcification carbon fixation is measured by combining the shell growth rate; for seabed carbon deposition, the dynamic changes of the seabed carbon pool are determined by sediment column sampling and carbon isotope analysis.

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