Pond culture of acanthopagrus chinensis coupled with aegiceras corniculatum in an internal circulation low-carbon system

Abstract

The present application relates to the technical field of internal circulation low-carbon system, and particularly relates to a mangrove plant acanthus ilicifolius and a Chinese ophicephalus pond breeding coupled internal circulation low-carbon system, which comprises three biological components: the mangrove plant acanthus ilicifolius, the Chinese ophicephalus and seawater tilapia, the three coexist in a low-salt seawater environment with a salinity of 5-8, and form a material circulation chain; the present application takes the tilapia breeding pond as a hub, and residual bait and excrement are transported to the acanthus ilicifolius planting area with circulating water to provide fertility, the debris of the mangrove plant acanthus ilicifolius is overflowed back to the tilapia breeding pond, thereby improving the medicinal and edible value of the tilapia, the Chinese ophicephalus is fed with 70-80% tilapia meat mixed feed, and the bait cost is reduced by 30%, and the tilapia pond rich in nitrogen and phosphorus mud cleaned in winter is reused as organic fertilizer for the acanthus ilicifolius, so as to realize the resource circulation of "fish feeding trees, and trees fattening fish", and reduce the input of external pollution.

Description

Technical Field

[0001] This invention relates to the field of internal circulation low-carbon system technology, and in particular to an internal circulation low-carbon system that couples the cultivation of mangrove plant *Gnaphalium affine* and *Calamus chinensis* in ponds. Background Technology

[0002] Scientific assessments show that the reclamation of mangrove forests for farmland, salt fields, and aquaculture ponds over the centuries is the primary reason for the dramatic decline in mangrove forests worldwide. In order to protect the nearshore marine environment, the ecological and environmental departments of coastal provinces (regions) in my country have also required the gradual elimination of traditional coastal aquaculture that fails to meet the standards for wastewater discharge.

[0003] Traditional pond aquaculture along the coast is an important source of income for local people. There is an urgent need for an innovative and sustainable model of returning ponds to mangrove forests that is both ecologically sound and economically beneficial. Old ponds generally suffer from three major drawbacks: First, the single aquaculture model leads to severe eutrophication of the water body, and fish disease control relies on chemical agents, which further pollutes the environment. Second, the lack of a recycling system means that uneaten feed and excrement cannot be utilized as resources, while greenhouse gas emissions remain uncontrolled. Third, attempts at renovation are mostly limited to simply planting mangrove seedlings, which cannot compensate farmers for the economic losses they have incurred.

[0004] Therefore, in response to the above-mentioned problems, this invention proposes a low-carbon, internally cyclical system for the coupled cultivation of mangrove plant *Gnaphalium affine* and *Calamus chinensis* in ponds. Through precise allocation of species ecological niches, coordinated layout of ditches and ponds, solar-driven water circulation, and periodic flooding and dew control, a material cycle chain of "fish nourishing trees and trees fattening fish" is constructed, thereby restoring the ecological function of mangroves while doubling economic output. Summary of the Invention

[0005] To overcome the problem of balancing ecological and economic benefits in pond renovation, this invention proposes a low-carbon system for pond aquaculture coupling of the mangrove plant *Gnaphalium affine* and the Chinese goby.

[0006] The technical solution of the present invention is: a low-carbon pond aquaculture system coupled with mangrove plant *Gnaphalium affine* and Chinese goby, comprising three biological components: mangrove plant *Gnaphalium affine*, Chinese goby, and marine tilapia. The three coexist in a low-salinity seawater environment with a salinity of 5-8, forming a material cycle chain.

[0007] Preferably, the system divides the pond to be planned into three functional areas, of which 70% of the area is a planting area for the mangrove plant *Gnaphalium affine*, 15% of the area is a breeding ditch for *Calamus chinensis*, and 15% of the area is a tilapia breeding pond that also serves as a water storage pond. The system is equipped with a solar-powered bottom pump that connects the tilapia breeding pond to an ecological breeding pond that includes a mangrove plantation area and a Chinese goby breeding ditch, in order to create a backflow water body between the two. Nano-aeration pipes were installed at the bottom of the Chinese goby farming ditches and tilapia farming ponds to increase dissolved oxygen in the water. An inlet gate is installed at the system inlet to replenish brackish water and adjust the salinity of the system water to 5-8‰; An overflow gate is installed between the ecological breeding pond and the tilapia farming pond to control the periodic flow of water from the ecological breeding pond into the tilapia farming pond.

[0008] Preferably, the breeding ditch for the Chinese mudskipper is set with a bottom width of 3 meters, a top width of 6 meters, a ditch wall slope of 1:1, and a depth of not less than 1.5 meters. PVC pipes, tiles or pottery jars are placed at the bottom of the ditch to create a burrowing environment for the Chinese mudskipper to inhabit, and a shade net is set up above the water surface of the breeding ditch.

[0009] Preferably, the tilapia farming pond has a water depth of at least 2.7 meters, and a photovoltaic panel with an area of ​​not less than 200 square meters is installed above the water surface of the pond, along with an energy storage device with a capacity of not less than 400 kilowatt-hours. When the pond bottom pump is working, it stops pumping when the water level in the tilapia farming pond drops to 1.5 meters from the bottom of the pond.

[0010] Preferably, the system controls the periodic flooding process through a water level gauge. Specifically, after the *Lepidium apetalum* planting area is exposed for 3 to 5 days, a pump is started to pump the water from the tilapia farming pond back to the ecological farming pond until the surface of the *Lepidium apetalum* planting area is flooded to a depth of 15 to 20 centimeters and maintained for 3 to 5 days. Then, the overflow gate is opened to allow the water from the ecological farming pond to flow into the tilapia farming pond until the *Lepidium apetalum* planting area is completely exposed.

[0011] Preferably, the material cycle process of the system includes: feeding tilapia with formulated feed in tilapia farming ponds; feeding tilapia with a mixture of 70% to 80% tilapia meat and 20% to 30% eel feed in the Chinese goby farming ditch of the ecological farming pond; the uneaten feed and excrement of tilapia and Chinese goby provide fertility for the growth of the mangrove plant *Gnaphalium affine*; and the overflow from the ecological farming pond carrying *Gnaphalium affine* plant debris into the tilapia farming pond, where it is consumed by the tilapia and enhances its market value as a food and medicine homology product.

[0012] Preferably, the pond bottom pump consists of two permanent magnet variable frequency submersible high-flow pumps with a unit power of 5 kWh to 7 kWh, and a total pumping rate of approximately 600 cubic meters per hour, which can complete the process of pumping water from the tilapia farming pond to the ecological breeding pond in about 6 hours.

[0013] Preferably, the system also includes an oxygenation system, which consists of three Roots aerators with a unit power of 7.5 kWh or one high-speed aerator with a power of not less than 30 kWh, used to supply air to the nano-aeration pipes installed at the bottom of the Chinese goby farming ditch and tilapia farming pond.

[0014] Preferably, sea bream are appropriately introduced into the breeding ditch of the Chinese goby in the ecological breeding pond to control the excessive reproduction of tilapia and their competition with the Chinese goby for food.

[0015] Preferably, the system cleans the tilapia farming ponds every winter and uses the sediment rich in nutrients such as nitrogen and phosphorus at the bottom as high-quality organic fertilizer in the mangrove plant *Hylocereus undatus* planting area to promote the growth of *Hylocereus undatus*.

[0016] The beneficial effects of this invention are: 1. Using tilapia farming ponds as the hub, uneaten feed and excrement are transported to the *Gnaphalium affine* planting area through the circulating water to provide fertilizer. Debris from the mangrove plant *Gnaphalium affine* is returned to the tilapia farming ponds through overflow, thereby enhancing the medicinal and dietary value of tilapia. Chinese goby is fed a mixed feed of 70-80% tilapia meat, reducing feed costs by 30%. The nitrogen- and phosphorus-rich bottom mud of the tilapia ponds cleaned in winter is reused as organic fertilizer from *Gnaphalium affine*, thus realizing a resource cycle of "fish nourishing trees, and trees fattening fish" and reducing the input of external pollution.

[0017] 2. By constructing a 70% planting area of ​​*Gnaphalium affine* in old ponds, mangrove vegetation is directly restored, meeting the removal requirements of the "Special Action Plan for the Protection and Restoration of Mangroves". In addition, the remaining 30% of the water surface is used for the breeding of *Cyprinus chinensis* and edible tilapia, forming a high-efficiency production model with high output per acre, which is significantly higher than the economic benefits of conventional mangrove restoration projects and effectively solves the problem of resistance to removal.

[0018] 3. By using a solar-powered water pump to drive the water circulation between the ecological breeding pond and the tilapia breeding pond, and in conjunction with the water level gauge to automatically control the gate, the conditions of 3-5 days of flooding (water depth 15-20cm) and 3-5 days of open beach in the mangrove forest are created periodically, which meets the needs of the mangrove plant *Hymenochloa chinensis* for intertidal habitat and greatly increases its annual yield.

[0019] 4. Select mangrove plants with overlapping salinity niches, such as *Gnaphalium affine* (tolerant to 0-8‰), *Cyprinus sinensis* (suitable for 5-15‰), and marine tilapia (tolerant to ≤30‰), to coexist in an environment with a salinity of 5-8‰. This ensures the physiological compatibility of the three species. Introducing seabream species into the *Cyprinus sinensis* aquaculture ditch inhibits the overproduction of tilapia, thereby avoiding feed competition and maintaining interspecific balance. Attached Figure Description

[0020] Figure 1 The diagram shown is a schematic plan view of the present invention. Figure 2 The diagram shown is a schematic representation of the habitat structure of this invention. Figure 3 The diagram shown illustrates the material cycle and water purification process of this invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but 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.

[0022] This invention provides an embodiment of a low-carbon, integrated pond aquaculture system for mangrove plant *Gnaphalium affine* and Chinese goby, comprising three biological components: mangrove plant *Gnaphalium affine*, Chinese goby, and marine tilapia. The three coexist in a low-salinity seawater environment with a salinity of 5-8, forming a material cycle chain.

[0023] Furthermore, *Channa argus* and the mangrove plant *Gnaphalium affine* are precious marine medicinal plants and animals. Tilapia are euryhaline, and all three can grow in low-salinity seawater (salinity 5-8). The system uses artificial feed to raise tilapia, with the tilapia and their fry serving as supplementary food for *Channa argus*. The uneaten food and excrement of *Channa argus* and tilapia provide nutrients for the growth of *Gnaphalium affine*. *Gnaphalium affine* plant debris can significantly enhance the market value of fish as both food and medicine. This invention involves digging ditches and setting traps in old, low-efficiency ponds along the coast, with *Gnaphalium affine* planted in 70% of the area and *Channa argus* cultivation ditches covering 1% of the water surface area. 5% of the area is used for tilapia farming ponds, which also serve as water storage ponds. Solar-powered bottom pumps create a backflow between the "Ratwort and Chinese Goby Ecological Farming Pond" and the "Tilapia Farming Pond," while simultaneously creating hydrodynamic conditions for the periodic submergence and exposure of the Ratwort forest, promoting the rapid growth of the Ratwort. Nano-aeration tubes are used to increase the dissolved oxygen concentration in the water, promoting water purification and healthy fish growth. This invention is suitable for the ecological transformation and industrial upgrading of old ponds in estuaries and coastal areas with freshwater sources, and is green, low-carbon, and environmentally friendly.

[0024] Furthermore, the rare marine medicinal plant *Gnaphalium affine* of this invention is a clump-forming mangrove plant, an upright shrub, 0.5-1.5 meters tall. It has strong sprouting ability after pruning, grows quickly and has high yield. It can be used to make medicine or develop health products. By raising high-value fish in *Gnaphalium affine* forests, not only are nutrients provided for the growth of *Gnaphalium affine*, but the economic benefits of returning ponds to forests can also be improved. This invention solves several problems in species configuration, planar layout, habitat creation, water circulation and tidal simulation, and water quality maintenance. It forms the key technical method of "mangrove plant *Gnaphalium affine* and *Calamus chinensis* pond planting and breeding coupled internal circulation low-carbon system", which has been applied in the "Zhonghe Mangrove Blue Carbon Ecological Farm Experimental Demonstration Hepu Project".

[0025] Furthermore, the formulation of the species according to the present invention will be described in detail: *Echinochloa crus-galli* generally inhabits the silty mudflats of estuaries with a salinity of 0-5, and can tolerate seawater with a salinity of 8. *Channa argus* is a valuable brackish water fish with high economic value, and is best suited to seawater salinity of 5-15. In terms of salinity, the ecological niches of *Echinochloa crus-galli* and *Channa argus* partially overlap, allowing them to coexist in environments with a salinity of 5-8. Tilapia, originally a freshwater fish, has recently appeared in large numbers in my country's coastal waters and can reproduce naturally, becoming a saltwater tilapia. The characteristics and uses of these three species are as follows.

[0026] Acanthusilicifolius is an erect shrub belonging to the Acanthaceae family, growing to a height of 0.5 to 1.5 meters. It is a typical salt-secreting mangrove plant, preferring low-salt and fertile environments. Its young leaves are mucilaginous. It generally grows in the silty mudflats of estuaries with a salinity of 0 to 5, but can tolerate seawater with a salinity of 8. It is common in Fujian and the coastal areas of South China.

[0027] The Chinese mudskipper (Bostrychus sinensis) belongs to the genus Bostrychus in the family Chellidae. It is a small, carnivorous, nearshore warm-water benthic fish, typically 100-150 mm in length, with larger individuals reaching 200 mm and weighing around 100 g. It is nocturnal, aggressive, and preys on small fish, shrimp, crabs, aquatic insects, and shellfish. It tolerates low dissolved oxygen levels, with an optimal seawater salinity of 5-15 for growth. During the high-temperature season, it is suitable for cultivation in aquatic environments... The water depth should be greater than 1.5m. In winter, it generally does not forage when the water temperature is below 15℃, and it begins to die when the temperature is below 10℃. The Chinese black goby mainly inhabits the mid-to-low tide zone of semi-brake waters such as shallow bays and estuaries, as well as the tidal channels in mangrove areas. At low tide, it hides in the crevices or rock fissures of the mudflats, and hibernates in the mud and sand bottom in winter. The Chinese black goby has tender and delicious flesh, is nourishing, and can remove blood stasis, promote blood circulation, and accelerate the healing of postoperative wounds. It is a traditional marine medicinal animal.

[0028] Tilapia, scientifically known as *Oreochromismossambicus*, belongs to the genus *Oreochromismossambicus* of the family Cichlidae (cichlid family). Tilapia are tropical euryhaline fish that can grow, develop, and reproduce in seawater. They have a wide diet, primarily plant-based, and are omnivorous, consuming large quantities of food. They grow rapidly, especially as juveniles. Native to Africa, tilapia resemble local crucian carp. Marine tilapia can tolerate salinity up to 30, grow quickly, are highly resilient, and have high yields. Marine tilapia have a higher market value than freshwater tilapia and are used in this patent as a supplementary feed for the Chinese goby.

[0029] Furthermore, the planar layout of the present invention will be described in detail below: Please see Figure 1The optimal layout for a low-carbon, integrated pond-based farming system combining *Hymenochloa crus-galli* and *Calamus chinensis* is 30-60 mu (approximately 2 hectares). *Hymenochloa crus-galli* should comprise 70% of the total area, *Calamus chinensis* farming ditches 15%, and tilapia farming ponds 15%. See Table 1 for detailed examples of system sizes of 30, 45, and 60 mu (approximately 2 hectares, 2 hectares, and 60 mu (approximately 4 hectares, 2 hectares, and 3 hectares, respectively). Table 1. Area of ​​the functional zone of the low-carbon pond aquaculture system coupled with the mangrove plant *Gnaphalium affine* and *Calamus stenoptera*. Proportion

[0030] Furthermore, the construction of the habitat for cultivation and breeding according to the present invention will be described in detail: Please see Figure 2 The system replenishes fresh and brackish water through an inlet gate, while simultaneously adjusting the salinity to 5-8. To ensure the Chinese mudskipper can withstand the high summer temperatures, the mudskipper breeding ditch is 3m wide at the bottom, 6m wide at the top, with a slope of 1:1 and a depth of ≥1.5m. Appropriate amounts of PVC pipes, tiles, and ceramic pots are placed at the bottom of the ditch to create a burrowing environment for the mudskipper. The planting surface of *Gnaphalium affine* needs to be flat. The high water level during water intake should be 15cm-20cm above the surface of the woodland tidal flat, while the low water level during drainage should fully expose the woodland tidal flat. The water depth in the tilapia breeding pond should be at least 2.7m. Pumping should stop when the water surface is 1.5m from the pond bottom to avoid affecting the normal growth of the tilapia population. Taking a system area of ​​30 mu as an example, the surface water exchange area of ​​the ecological breeding pond is 25.5 mu, with a water depth of 0.2m and a water volume of 3400m³. 3 The water flowing into the 4.5-acre tilapia farming pond increases the water level by 1.13 meters, therefore the 2.7-meter-deep tilapia farming pond can meet the requirements for periodic water exchange.

[0031] Although the Chinese goby and tilapia are highly tolerant of low dissolved oxygen, in order to fully decompose organic matter in the water to provide mineral nutrients for the goby and for the healthy growth of the fish, it is necessary to install nano-aeration pipes at the bottom of the ecological breeding pond and the tilapia breeding pond to improve the dissolved oxygen environment of the water.

[0032] Please see Figure 3 Furthermore, the material cycle of the present invention will be described in detail below: The material cycle in the tilapia farming pond is explained as follows: Tilapia compound feed is relatively inexpensive and is used to feed the tilapia daily; the overflow from the ecological breeding pond of *Gnaphalium affine* and *Cyprinus sinensis* (hereinafter referred to as "ecological breeding pond") carries a large amount of *Gnaphalium affine* plant debris. This debris is not only consumed by the tilapia, but also significantly enhances the market value of marine tilapia as both food and medicine.

[0033] The material cycle in the ecological breeding pond is explained: Chinese goby is generally fed small fish or eel feed, which is costly. It can be replaced by 70-80% tilapia meat mixed with 20-30% eel feed to reduce the feed cost of Chinese goby.

[0034] The process of material cycling for water purification is explained as follows: After the *Lepidium apetalum* forest is exposed for 3-5 days, water from the tilapia farming ponds is pumped back into the ecological farming ponds until the surface of the *Lepidium apetalum* forest mudflats is submerged to a depth of 15-20 cm and maintained for 3-5 days. Then, the overflow gate is opened, allowing water from the ecological farming ponds to flow into the tilapia farming ponds until the *Lepidium apetalum* forest mudflats are fully exposed. This process can be automatically controlled using a water level gauge. Periodic flooding is not only a necessary condition for the growth of *Lepidium apetalum*, but also a process of evenly fertilizing the forest. Furthermore, the tilapia farming ponds are cleaned every winter; the sediment at the bottom of the ponds is rich in nitrogen and phosphorus, providing excellent organic fertilizer for the growth of *Lepidium apetalum*.

[0035] In order to prevent the excessive reproduction of tilapia in the ecological breeding pond, which would lead to competition for food between tilapia and Chinese goby, sea bream species are appropriately introduced into the ecological breeding pond.

[0036] Furthermore, the energy supply of the present invention will be described in detail: This system uses photovoltaics as the primary energy source to power the water pumps and oxygenation equipment, with agricultural electricity as an emergency supplement. Photovoltaic panels are installed on the surface of the tilapia farming ponds, or on the surface of the aquaculture ditches in the ecological farming ponds. Two permanent magnet variable frequency submersible high-flow water pumps with a unit power of 5~7KW / h can pump 600m³ of water per hour. 3 The water recirculation process for tilapia farming ponds can be completed in approximately 6 hours. In practice, this recirculation process can be completed within 3-5 days, with low power requirements. The system is equipped with three Roots aerators with a power of 7.5KW / h or one high-speed aerator with a power of 30KW / h or higher to supply air to the nano-aeration tubes. The maximum daily power consumption of the above power system is approximately 500KW, requiring a 200m... 2 The photovoltaic panels and energy storage equipment of 400KW or more meet the energy consumption needs of the air pump at night.

[0037] This invention provides an embodiment, taking a system area of ​​30 mu as an example, the annual output value can reach 595,800 yuan, and the unit output value is close to 20,000 yuan / mu. See Table 2 for details: Table 2 Output Assessment of the Low-Carbon System Coupled with Mangrove Plant *Gnaphalium affine* and *Calamus stenoptera* in Pond Aquaculture

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A low-carbon, integrated pond aquaculture system combining the mangrove plant *Gnaphalium affine* and the Chinese sleeper goby, characterized in that... It includes three biological components: the mangrove plant *Gnaphalium affine*, the Chinese goby, and the marine tilapia. The three coexist in a low-salinity seawater environment with a salinity of 5-8, forming a material cycle chain. The system divides the pond to be planned into three functional areas, of which 70% of the area is a planting area for the mangrove plant *Gnaphalium affine*, 15% of the area is a breeding ditch for the Chinese black goby, and 15% of the area is a tilapia breeding pond that also serves as a water storage pond. The system is equipped with a solar-powered bottom pump that connects the tilapia breeding pond to an ecological breeding pond that includes a mangrove plantation area and a Chinese goby breeding ditch, in order to create a backflow water body between the two. Nano-aeration pipes were installed at the bottom of the Chinese goby farming ditches and tilapia farming ponds to increase dissolved oxygen in the water. An inlet gate is installed at the system inlet to replenish brackish water and adjust the salinity of the system water to 5-8%; An overflow gate is installed between the ecological breeding pond and the tilapia breeding pond to control the periodic flow of water from the ecological breeding pond into the tilapia breeding pond. The Chinese mudskipper breeding ditch is designed with a bottom width of 3 meters, a top width of 6 meters, a ditch wall slope of 1:1, and a depth of not less than 1.5 meters. PVC pipes, tiles or pottery jars are placed at the bottom of the ditch to create a burrowing environment for the Chinese mudskipper to inhabit, and a shade net is set up above the water surface of the breeding ditch. The tilapia farming pond has a water depth of at least 2.7 meters, and a photovoltaic panel with an area of ​​not less than 200 square meters is installed above the water surface of the pond, and is equipped with an energy storage device with a capacity of not less than 400 kilowatt-hours. When the pond bottom pump is working, it stops pumping when the water level in the tilapia farming pond drops to 1.5 meters from the bottom of the pond. The system controls the periodic flooding process through a water level gauge. Specifically, after the tilapia planting area is exposed for 3 to 5 days, the pump is started to pump the water from the tilapia breeding pond back to the ecological breeding pond until the surface of the tilapia planting area is flooded to a depth of 15 to 20 centimeters and maintained for 3 to 5 days. Then the overflow gate is opened to allow the water from the ecological breeding pond to flow into the tilapia breeding pond until the tilapia planting area is completely exposed. The material cycle process of the system includes: feeding tilapia with formulated feed in tilapia farming ponds; feeding tilapia with a mixture of 70% to 80% tilapia meat and 20% to 30% eel feed in the Chinese goby farming ditch of the ecological farming pond; the uneaten feed and excrement of tilapia and Chinese goby provide growth fertilizer for the mangrove plant *Gnaphalium affine* planting area; and the overflow from the ecological farming pond carrying *Gnaphalium affine* plant debris into the tilapia farming pond, where it is consumed by the tilapia and enhances its market value as a food and medicine homology product. The system also includes an oxygenation system, which consists of three Roots aerators with a unit power of 7.5 kWh or one high-speed aerator with a power of not less than 30 kWh, used to supply air to the nano-aeration pipes installed at the bottom of the Chinese goby farming ditch and tilapia farming pond. In the breeding ditch of the Chinese goby in the ecological breeding pond, sea bream are appropriately introduced to control the excessive reproduction of tilapia and their competition with the Chinese goby for food.

2. The low-carbon pond aquaculture system of *Gnaphalium affine* and *Calamus stenoptera* as described in claim 1, characterized in that: The pond bottom pump consists of two permanent magnet variable frequency submersible high-flow pumps with a unit power of 5 kW to 7 kW. Its total pumping rate is 600 cubic meters per hour, which can complete the process of pumping water from the tilapia farming pond to the ecological breeding pond within 6 hours.

3. The low-carbon pond aquaculture system of *Gnaphalium affine* and *Calamus stenoptera* as described in claim 1, characterized in that: The system cleans the tilapia ponds every winter and uses the nitrogen- and phosphorus-rich sediment at the bottom as high-quality organic fertilizer in the mangrove plant *Hylocereus undatus* planting area to promote the growth of *Hylocereus undatus*.

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