A mangrove crab co-cultivation ecological cultivation device

Abstract

The invention discloses a mangrove crab co-cultivation ecological cultivation device, comprising a pond bottom layer, wherein both sides of the pond bottom layer are provided with pond embankments, a plurality of seedling beds are provided on the pond bottom layer, a secondary ditch is formed between two adjacent seedling beds, a main ditch is formed between the seedling beds and the pond embankments on both sides, and an inlet and outlet are provided near one side of the inner cavity of the pond embankment. The invention utilizes the benthic living habits and burrowing defense characteristics of blue crabs that they like to live in mangrove wetland tidal flats, constructs a circulating water system in the mangrove seedling cultivation space of a suitable forest pond to cultivate blue crabs, utilizes the seedling spacing and root system as the blue crab habitat and burrowing place, increases the blue crab activity space, improves the defense ability, reduces the killing caused by individual competition for food and competition for habitat space, and can reduce predation by water birds. At the same time, the eutrophication of the bottom mud and aquaculture tail water caused by material input during blue crab cultivation provides nutrition for the growth of seedlings, forming a co-cultivation ecological cultivation system for mangrove seedling production and blue crab cultivation.

Description

Technical Field

[0001] The invention relates to the technical field of mangrove seedling cultivation and blue crab breeding, and in particular to a mangrove crab co-cultivation ecological cultivation device. Background Art

[0002] The quality of blue crab seedlings and the space guarantee of habitat determine the breeding effect. At present, blue crab breeding is mainly based on the release of small-sized bean crab seedlings of 0.3-0.5cm. Due to the small size and weak mobility of individuals, the feeding ability and enemy defense ability in the pond are poor. The competition for bait and habitat space, the attacks of water birds and other enemies, etc., have a significant impact on breeding. The survival rate of breeding is generally only about 10%. In pond breeding, the traditional methods of using hanging nets, pipes, etc. to increase the habitat space and fences to prevent birds have limited effect. In the breeding process, blue crabs are very likely to live in the bottom of the mangrove wetland and burrow for defense. According to this characteristic, and with the market demand for blue crab breeding production technology, it is necessary to invent a blue crab ecological breeding system that conforms to the principles of blue crab ecology and breeding biology, is operational, easy to promote, and is green, environmentally friendly, high-yield, and high-quality. For this purpose, we have brought a mangrove crab co-cultivation ecological cultivation device. Summary of the invention

[0003] The technical problem solved by the present invention is to overcome the defects of the prior art and provide a mangrove crab co-cultivation ecological cultivation device.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The pond bottom layer is provided with a pond embankment on both sides of the pond bottom layer, a plurality of seedling base beds are opened on the pond bottom layer, a secondary ditch is formed between two adjacent seedling base beds, and a main ditch is formed between the seedling base beds and the pond embankment on both sides, an inlet and outlet is opened in the inner cavity of the pond embankment near one side, a cross bar is provided at the top of the pond embankment near one side, the cross bar is located above the adjacent inlet and outlet, the bottom of the cross bar is fixedly connected to vertical rods near both ends, the bottom end of the vertical rod is provided with a cross plate, one side of the cross plate is fixedly inserted on the pond embankment, the bottom end of the vertical rod movably passes through the adjacent cross plates and is fixedly connected with a floating plate, the inner cavity of the inlet and outlet is fixedly connected with a frame near the main ditch, the inner cavity of the frame is fixedly connected with a plurality of dirt-blocking rods, a floating rod is provided on the side of the frame away from the main ditch, a plurality of cleaning rods are fixedly connected to the side of the floating rod close to the frame, a connecting rod is fixedly connected to the top of the floating rod, and the connecting rod is fixedly connected to the bottom of the cross bar.

[0006] Preferably, a plurality of the dirt-blocking rods and the cleaning rods are sequentially arranged in a linear array, and the cleaning rods penetrate the frame, and a plurality of the dirt-blocking rods and the cleaning rods are staggered with each other.

[0007] Preferably, the side of the floating plate away from the main ditch is arranged in an arc shape, and the arc opening faces upward.

[0008] Preferably, the cross-section of the seedling bed is trapezoidal, and the shorter side of the trapezoidal structure of the seedling bed faces upward.

[0009] Preferably, the width of the auxiliary groove is 80-100 cm, the depth of the auxiliary groove is 50-60 cm, the width of the main groove is 100-150 cm, and the depth of the main groove is 80-100 cm.

[0010] Preferably, the width of the seedling bed is 120-150 cm, the length of the seedling bed is 1200-1500 cm, and the diameter of the inlet and outlet is 80-100 cm.

[0011] A method for using a mangrove crab collaborative ecological cultivation device comprises the following steps:

[0012] Step 1: Construction of the ring ditch, the water connection channel excavated on the bottom of the pond, namely the main ditch and the secondary ditch. The main ditch surrounds the bottom of the pond and is connected to the inlet and outlet. The main ditch is the main circulating water channel. According to the size of the pond, the ring ditch is designed to be 150-100cm wide and 80-100cm deep. Each secondary ditch is connected to the main ditch. The secondary ditch ensures the connection and water circulation of the entire pond water area. The secondary ditch is designed to be 80-100cm wide and 50-60cm deep. The width and depth of the main ditch and the secondary ditch can be appropriately adjusted according to the soft sand and mud environment of the bottom of the pond and the convenience of cultivation operation;

[0013] Step 2: Forest land construction, i.e. the construction of seedling bed. The part formed between several secondary ditches is the seedling bed, which is 200cm away from the pool embankment. The seedling bed is designed as a rectangular ridge with a width of 120-150cm and a length of 1200-1500cm. Each seedling bed is provided with water for cultivation by the main ditch and secondary ditch;

[0014] Step 3: Construction of the sluice gate. The inlet and outlet are the control channels for the introduction of seawater tide and water quality exchange in the pond. The diameter is 80-100cm. The water level on the side of the embankment away from the bottom of the pond is the tidal level. When water enters and exits, the dirt bar can block impurities to prevent impurities from entering the pond. When the water level rises, the floating plate and the floating rod move up and down with the water level, so that the cross bar moves upward. The cross bar drives the cleaning rod to move through the connecting rod. The cleaning rod cleans up the impurities attached to the dirt bar to prevent accumulation that prevents water from flowing in. As the water level drops, the cleaning rod, floating plate and floating rod move downward;

[0015] Step 4: Seedling cultivation. When transplanting seedlings, forest seedlings are transplanted using traditional degradable seedling cups. The seedling cup cultivation matrix is ​​prepared using soil testing formula. The mangrove seedlings in the seedling cultivation bed are required to have a seedling period of more than 1-2 years and a plant height of ≥50-60cm. The planting density of mangrove seedlings in each seedling cultivation bed is 100 plants long x 10 plants wide, for a total of 1,000 plants.

[0016] Step 5: Crab seedling cultivation. After the seedlings are planted, start pond cleaning. When cleaning the pond, the water level should be 10-20cm above the base of the rhizomes of the forest seedlings. The pond cleaning time is 7-10 days. Then you can directly put crab seedlings. The specifications for the main ditch and the secondary ditch are about 0.5cm in shell length, and the stocking density is 15-20 per square meter. Feed with artificial compound feed. The amount of bait fed each time is based on the bait in the silk net. The facility is completed in half an hour. The blue crab culture time is 150-180 days, and the crab can be harvested when the weight is more than 300-400g.

[0017] Step six: Water quality management. Start draining and changing water 10-15 days after the crab seedlings are released. During the breeding period, the water level difference in the pond should be controlled at 50-80cm. The highest water level can submerge the seedlings, and the lowest water level is controlled at the base of the seedling roots to ensure the water level in the ditch breeding. The tidal time is based on free inflow and discharge to ensure the water quality inflow and discharge of the pond.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention utilizes the benthic living habits and burrowing defense characteristics of blue crabs that they prefer to live in mangrove wetland tidal flats, constructs a circulating water system in the mangrove seedling cultivation space of the forest pond to cultivate blue crabs, utilizes the seedling spacing and root system as the habitat and burrowing place of blue crabs, increases the activity space of blue crabs, improves the defense ability, reduces the killing of individuals due to competition for food and habitat space, and reduces water bird predation. At the same time, the eutrophic sediment and aquaculture tail water caused by material input during blue crab cultivation provide nutrition for the growth of seedlings, and forms a co-operation ecological cultivation system for mangrove seedling production and blue crab cultivation;

[0020] 2. The present invention constructs the forest land according to the basic water level of the pond and the elevation of the bottom of the pond, digs a ring ditch around the forest land to construct an aquaculture water system, and introduces seawater in the ring ditch through the tidal ditch in the sea area as a water source for mangrove seedling cultivation and pond blue crab aquaculture; the seedlings are loaded into the fixed forest land with seedling cups, and the blue crab seedlings are placed in the ring ditch for cultivation. The blue crab nutrition is supplied by artificial bait feeding, and the aquaculture bottom mud and aquaculture tail water are used by the mangrove seedlings as nutrition absorption. In the system, the production process of mangrove seedlings and blue crabs has no direct discharge of pollutants, the cultivation process is ecological and environmentally friendly, and the cultivated mangrove seedlings and blue crabs have good quality and high price;

[0021] 3. The present invention arranges floating rods, cleaning rods, floating plates and dirt-blocking rods at the inlet and outlet. The dirt-blocking rods can block impurities to prevent them from entering the pond. When the water level rises, the floating plates and floating rods move up and down with the water level, thereby causing the cross bar to move upward. The cross bar drives the cleaning rod to move through the connecting rod. The cleaning rod cleans away impurities attached to the dirt-blocking rod to prevent accumulation that prevents water from flowing in. As the water level drops, the cleaning rod, floating plates and floating rods move downward. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 A top view of the present invention;

[0024] Figure 3 It is a side view of the component frame of the present invention;

[0025] Figure 4 A top view of the component frame of the present invention;

[0026] Figure 5 It is a flow chart of the present invention.

[0027] Numbers in the figure: 1. pond bottom layer; 2. pond embankment; 3. seedling bed; 4. main ditch; 5. secondary ditch; 6. inlet and outlet; 7. horizontal bar; 8. vertical bar; 9. horizontal board; 10. frame; 11. connecting rod; 12. floating rod; 13. cleaning rod; 14. floating board; 15. dirt-blocking rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-5 , the present invention provides a technical solution:

[0030] A mangrove crab co-cultivation ecological device comprises a pond bottom layer 1, a pond embankment 2 is arranged on both sides of the pond bottom layer 1, a plurality of seedling base beds 3 are opened on the pond bottom layer 1, a secondary ditch 5 is formed between two adjacent seedling base beds 3, a main ditch 4 is formed between the seedling base beds 3 and the pond embankment 2 on both sides, an inlet and outlet 6 is opened near one side of the inner cavity of the pond embankment 2, a cross bar 7 is arranged near one side of the top of the pond embankment 2, the cross bar 7 is located above the adjacent inlet and outlet 6, the bottom of the cross bar 7 is fixedly connected with vertical bars 8 near both ends, and the bottom end of the vertical bar 8 is provided with A horizontal plate 9, one side of which is fixedly inserted on the pool embankment 2, the bottom end of the vertical rod 8 movably passes through the adjacent horizontal plate 9 and is fixedly connected to a floating plate 14, the inner cavity of the inlet and outlet 6 is fixedly connected to a frame 10 near the main ditch 4, the inner cavity of the frame 10 is fixedly connected to a plurality of dirt-blocking rods 15, a floating rod 12 is provided on the side of the frame 10 away from the main ditch 4, a plurality of cleaning rods 13 are fixedly connected to the side of the floating rod 12 close to the frame 10, the top of the floating rod 12 is fixedly connected to a connecting rod 11, and the connecting rod 11 is fixedly connected to the bottom of the horizontal bar 7.

[0031] A plurality of dirt-barrier rods 15 and cleaning rods 13 are sequentially arranged in a linear array, and the cleaning rods 13 penetrate the frame 10 , and the plurality of dirt-barrier rods 15 and cleaning rods 13 are staggered with each other.

[0032] The side of the floating plate 14 away from the main ditch 4 is arranged in an arc shape, and the arc opening faces upward.

[0033] The cross section of the seedling bed 3 is trapezoidal, and the shorter side of the trapezoidal structure of the seedling bed 3 faces upward.

[0034] The width of the auxiliary groove 5 is 80-100 cm, the depth of the auxiliary groove 5 is 50-60 cm, the width of the main groove 4 is 100-150 cm, and the depth of the main groove 4 is 80-100 cm.

[0035] The width of the seedling bed 3 is 120-150 cm, the length of the seedling bed 3 is 1200-1500 cm, and the diameter of the inlet and outlet 6 is 80-100 cm.

[0036] A mangrove crab collaborative ecological cultivation device comprises the following steps:

[0037] Step 1: Construction of the ring ditch, the water connecting channel excavated on the bottom layer 1 of the pond, namely the main ditch 4 and the secondary ditch 5, the main ditch 4 surrounds the bottom layer 1 of the pond and is connected to the inlet and outlet 6. The main ditch 4 is the main circulating water channel. According to the size of the pond, the ring ditch is designed to be 150-100 cm wide and 80-100 cm deep. Each secondary ditch 5 is connected to the main ditch 4. The secondary ditch 5 ensures the connection and water circulation of the entire pond water area. The secondary ditch 5 is designed to be 80-100 cm wide and 50-60 cm deep. The width and depth of the main ditch 4 and the secondary ditch 5 can be appropriately adjusted according to the soft sandy mud environment of the bottom layer 1 of the pond and the convenience of cultivation operation;

[0038] Step 2: Construction of forest land, i.e., construction of seedling bed 3. The part formed between several auxiliary ditches 5 is seedling bed 3, which is 200cm away from the pool embankment 2. Seedling bed 3 is designed as a rectangular ridge with a specification of 120-150cm in width and 1200-1500cm in length. Each seedling bed 3 is provided with water source for cultivation by main ditch 4 and auxiliary ditch 5.

[0039] Step 3: Construction of the sluice gate. The inlet and outlet 6 is the control channel for the introduction of seawater tide and water quality exchange in the pond, with a diameter of 80-100 cm. The water level on the side of the pond embankment 2 away from the bottom layer 1 of the pond is the tidal water level. When water enters and exits, the dirt-barrier 15 can block impurities to prevent impurities from entering the pond. When the water level rises, the floating plate 14 and the floating rod 12 move up and down with the water level, thereby causing the cross bar 7 to move upward. The cross bar 7 drives the cleaning rod 13 to move through the connecting rod 11. The cleaning rod 13 cleans away the impurities attached to the dirt-barrier 15 to prevent accumulation that prevents water from flowing in. As the water level drops, the cleaning rod 13, the floating plate 14 and the floating rod 12 move downward;

[0040] Step 4: Seedling cultivation. When transplanting seedlings, forest seedlings are transplanted using traditional degradable seedling cups. The seedling cup cultivation matrix is ​​configured using soil testing formula. The mangrove seedlings in the seedling cultivation bed 3 are required to have a seedling period of more than 1-2 years and a plant height of ≥50-60cm. The planting density of mangrove seedlings in each seedling cultivation bed 3 is 100 plants long x 10 plants wide, for a total of 1,000 plants.

[0041] Step 5: Crab seedling cultivation. After the seedlings are planted, start pond cleaning. When cleaning the pond, the water level should be 10-20cm above the base of the rhizomes of the forest seedlings. The pond cleaning time is 7-10 days. Then you can directly put crab seedlings. The specifications for putting crab seedlings in the main ditch 4 and the secondary ditch 5 are about 0.5cm in shell length. The stocking density is 15-20 per square meter. Feed with artificial compound feed. The amount of bait fed each time is based on the completion of the bait facility in the silk net in half an hour. The blue crab culture time is 150-180 days, and the crab can be harvested when the weight is more than 300-400g.

[0042] Step six: Water quality management. Start draining and changing water 10-15 days after the crab seedlings are released. During the breeding period, the water level difference in the pond should be controlled at 50-80cm. The highest water level can submerge the seedlings, and the lowest water level is controlled at the base of the seedling roots to ensure the water level in the ditch breeding. The tidal time is based on free inflow and discharge to ensure the water quality inflow and discharge of the pond.

[0043] Working principle: Ring ditch construction, water connecting channel excavated on the bottom layer 1 of the pond, namely the main ditch 4 and the secondary ditch 5. The main ditch 4 surrounds the bottom layer 1 of the pond and is connected with the inlet and outlet 6. The main ditch 4 is the main circulating water channel. According to the size of the pond, the ring ditch is designed to be 150-100cm wide and 80-100cm deep. Each secondary ditch 5 is connected with the main ditch 4. The secondary ditch 5 ensures the connection and water circulation of the entire pond water area. The secondary ditch 5 is designed to be 80-100cm wide and 50-60cm deep. The width and depth of the main ditch 4 and the secondary ditch 5 can be appropriately adjusted according to the soft sandy mud environment of the bottom layer 1 of the pond and the convenience of cultivation operation. The main ditch 4 and the secondary ditch 5 are channels for the flow and circulation of pond seawater, providing water for the growth of seedlings. They are also the water areas for blue crab breeding. Forest land construction, that is, the construction of seedling base bed 3. The part formed between several secondary ditches 5 is the seedling base bed 3, which is 1.5 meters away from the pond embankment. 2 spacing is 200cm, the seedling bed 3 is designed as a rectangular ridge, with specifications of 120-150cm in width and 1200-1500cm in length. Each seedling bed 3 is provided with a cultivation water source by the main ditch 4 and the secondary ditch 5, and a sluice is constructed. The inlet and outlet 6 is a control channel for the introduction of seawater tide and water quality exchange in the pond, with a diameter of 80-100cm. The water level on the side of the pond embankment 2 away from the bottom layer 1 of the pond is the tidal water level. When water enters and exits, the dirt bar 15 can block impurities to prevent impurities from entering the pond. When the water level rises, the floating board 14 and the floating rod 12 move up and down with the water level, thereby causing the cross bar 7 to move upward. The cross bar 7 drives the cleaning rod 13 to move through the connecting rod 11. The cleaning rod 13 cleans up the impurities attached to the dirt bar 15 to avoid accumulation that prevents water from flowing in. As the water level drops, the cleaning rod 13, the floating board 14 and the floating rod 12 move downward;

[0044] For seedling cultivation and transplantation, forest seedlings are transplanted in traditional degradable seedling cups. The seedling cup cultivation matrix is ​​configured using soil testing formula. The mangrove seedlings in the seedling cultivation bed 3 require a seedling period of more than 1-2 years and a plant height of ≥50-60cm. The planting density of each seedling cultivation bed 3 is 100 plants in length and 10 plants in width, for a total of 1,000 plants. During the cultivation period, the seedlings do not need to be fertilized. They mainly rely on the siltation generated by the crab seedling cultivation and the aquaculture tail water to provide nutrition, as well as the nutrient input brought by the exchange of seawater in the pond. Insect-killing lamps are set up in the forest to lure and kill pests, reduce the harm of pests to seedlings, avoid the pollution of pond soil and water quality and poisoning of blue crabs by using pesticides, and cultivate crab seedlings. After the seedlings are planted, the pond cleaning operation begins. Pond cleaning and killing of pests are the key to blue crab breeding. When cleaning the pond, the water level of the pond should be 10-20cm above the root base of the forest seedlings. Use 10ppm tea bran to spray the whole pond. The amount of spraying can be appropriately increased in the ring ditch. The pond cleaning time is 7-10 days, and then the crab seedlings can be directly placed. The main ditch is 4 The specification of stocking in the auxiliary ditch 5 is about 0.5cm in shell length, and the stocking density is 15-20 / ㎡. They are fed with artificial compound feed, and the facilities are checked with silk nets. The amount of bait fed each time is based on the completion of the facilities in the silk nets in half an hour. The blue crabs can be harvested after 150-180 days of breeding and weighing more than 300-400g. Blue crabs are generally captured in batches with ground cages to reduce the harm and damage to the individual blue crabs during capture. The ground cages are placed in the main ditch waters to avoid damage to the roots of seedlings caused by the placement in the auxiliary ditch. Harm, cage capture time is 4-5 hours each time, to reduce high-density and long-term aggregation of earthworms caused by mutual attack and killing among blue crabs; you can also directly drain the water and capture and harvest at one time when the seedlings are transplanted. For water quality management, drainage and water replacement should be started 10-15 days after the crab seedlings are released. During the breeding period, the water level difference in the pond is controlled at 50-80cm. The highest water level can flood the seedlings, and the lowest water level is controlled at the base of the seedlings' roots and stems to ensure the water level for ring ditch breeding. The tidal time is based on free inflow and discharge to ensure the water quality in the pond.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mangrove crab co-cultivation ecological device, comprising a pond bottom layer (1), characterized in that: The bottom layer (1) of the pond is provided with a pond embankment (2) on both sides. A plurality of seedling beds (3) are provided on the bottom layer (1) of the pond. A secondary ditch (5) is formed between two adjacent seedling beds (3). A main ditch (4) is formed between the seedling beds (3) and the embankment (2) on both sides. An inlet and outlet (6) is provided in the inner cavity of the embankment (2) near one side. A cross bar (7) is provided near one side of the top of the embankment (2). The cross bar (7) is located above the adjacent inlet and outlet (6). The bottom of the cross bar (7) is fixedly connected to vertical bars (8) near both ends. The bottom end of the vertical bar (8) is provided with a cross plate (9). One side of the cross plate (9) is fixedly plugged onto the embankment (2). The bottom end of the vertical bar (8) movably passes through the adjacent cross plate (9) and is fixedly connected to a floating plate (14). The inlet and outlet The inner cavity of (6) is fixedly connected to a frame (10) near the main ditch (4), and the inner cavity of the frame (10) is fixedly connected to a plurality of dirt-blocking rods (15). A floating rod (12) is provided on the side of the frame (10) away from the main ditch (4), and a plurality of cleaning rods (13) are fixedly connected on the side of the floating rod (12) close to the frame (10). A connecting rod (11) is fixedly connected to the top of the floating rod (12), and the connecting rod (11) is fixedly connected to the bottom of the cross bar (7). The plurality of dirt-blocking rods (15) and cleaning rods (13) are arranged in a linear array in sequence, and the cleaning rods (13) penetrate the frame (10). The plurality of dirt-blocking rods (15) and cleaning rods (13) are staggered with each other. The side of the floating plate (14) away from the main ditch (4) is in an arc shape, and the arc opening faces upward.

2. The mangrove crab co-cultivation ecological device according to claim 1, characterized in that: The cross section of the seedling base bed (3) is trapezoidal, and the shorter side of the trapezoidal structure of the seedling base bed (3) faces upwards.

3. The mangrove crab co-cultivation ecological device according to claim 1, characterized in that: The width of the auxiliary groove (5) is 80-100 cm, the depth of the auxiliary groove (5) is 50-60 cm, the width of the main groove (4) is 100-150 cm, and the depth of the main groove (4) is 80-100 cm.

4. The mangrove crab co-cultivation ecological device according to claim 1, characterized in that: The width of the seedling bed (3) is 120-150 cm, the length of the seedling bed (3) is 1200-1500 cm, and the diameter of the water inlet and outlet (6) is 80-100 cm.

5. A method for using a mangrove crab co-cultivation ecological cultivation device according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Construction of a ring ditch. A water connecting channel is excavated on the bottom layer (1) of the pond, namely, a main ditch (4) and a secondary ditch (5). The main ditch (4) surrounds the bottom layer (1) of the pond and is connected to the inlet and outlet (6). The main ditch (4) is the main circulating water channel. According to the size of the pond, the ring ditch is designed to be 150-100 cm wide and 80-100 cm deep. Each secondary ditch (5) is connected to the main ditch (4). The secondary ditch (5) ensures that the entire pond water area is connected and the water circulates. The secondary ditch (5) is designed to be 80-100 cm wide and 50-60 cm deep. The width and depth of the main ditch (4) and the secondary ditch (5) are appropriately adjusted according to the soft sand and mud environment of the bottom layer (1) of the pond and the convenience of cultivation operation; Step 2: Construction of forest land, i.e., construction of seedling bed (3). The portion formed between the plurality of secondary ditches (5) is the seedling bed (3), which is 200 cm away from the pond embankment (2). The seedling bed (3) is designed to be rectangular, with a width of 120-150 cm and a length of 1200-1500 cm. Each seedling bed (3) is provided with water for cultivation by the main ditch (4) and the secondary ditch (5); Step 3: constructing a water gate. The inlet and outlet (6) is a control channel for introducing seawater tide into the pond and exchanging water quality. The diameter is 80-100 cm. The water level on the side of the pond embankment (2) away from the bottom layer (1) of the pond is the tidal water level. When water enters and exits, the dirt-blocking rod (15) can block impurities to prevent impurities from entering the pond. When the water level rises, the floating plate (14) and the floating rod (12) move up and down with the water level, thereby causing the cross bar (7) to move upward. The cross bar (7) drives the cleaning rod (13) to move through the connecting rod (11). The cleaning rod (13) cleans away impurities attached to the dirt-blocking rod (15) to prevent accumulation that prevents water from flowing in. As the water level drops, the cleaning rod (13), the floating plate (14) and the floating rod (12) move downward. Step 4: Seedling cultivation. When transplanting seedlings, forest seedlings are transplanted using traditional degradable seedling cups. The seedling cup cultivation matrix is ​​prepared using a soil test formula. The mangrove seedlings in the seedling cultivation bed (3) are required to be at least 1-2 years old and have a plant height of ≥50-60 cm. The planting density of mangrove seedlings in each seedling bed (3) is 100 plants long x 10 plants wide, for a total of 1,000 plants. Step 5: Crab seedling cultivation. After the seedlings are planted, the pond cleaning operation begins. When the pond is cleaned, the water level is 10-20 cm above the base of the rhizomes of the forest seedlings. The pond cleaning time is 7-10 days. Then the crab seedlings are directly released. The specifications for the release in the main ditch (4) and the secondary ditch (5) are about 0.5 cm in shell length. The release density is 15-20 per square meter. Artificial compound feed is fed. The amount of bait fed each time is based on the bait in the silk net. The facility is completed in half an hour. The blue crab culture time is 150-180 days. When the weight is more than 300-400g, it can be harvested. Step six: Water quality management. Start draining and changing water 10-15 days after the crab seedlings are released. During the breeding period, the water level difference in the pond should be controlled at 50-80cm. The highest water level should flood the seedlings, and the lowest water level should be controlled at the base of the seedling roots to ensure the water level in the ditch breeding. The tidal time should be based on free inflow and discharge to ensure the water quality in the pond.

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