Comprehensive management method for preventing and controlling floating of vallisneria natans in river crab pond in plum rain period

Abstract

The invention belongs to the technical field of aquaculture, and discloses a comprehensive management method for preventing and controlling floating of vallisneria natans in a river crab pond in a plum rain period, which comprises the following steps: pond trimming: arranging a bentonite field in the pond, opening up a circular groove around the bentonite field, arranging a green ridge on the periphery of the circular groove, and planting Elodea nuttallii; releasing juvenile river crabs; planting vallisneria natans: planting the vallisneria natans in the bentonite before and after the Qingming, and regulating and controlling the water level of the bentonite; water quality regulation: after entering the plum rain period, regulating the water level of the bentonite and regulating the transparency of the water body; dissolved oxygen management: controlling the dissolved oxygen content at the bottom of the pond to be greater than 3mg / L in the plum rain period; mineral fertilizer application, wherein mineral fertilizer is regularly applied to the bentonite area in the plum rain period. By optimizing the planting area and density management of the vallisneria natans, disturbance of the river crabs is reduced, meanwhile, by supplementing mineral fertilizer and adjusting water transparency, nutrition and illumination are provided for growth of roots of aquatic plants, growth of the roots of the vallisneria natans can be effectively promoted, the floating problem of the vallisneria natans is systematically solved, and the success rate reaches 90% or above.

Description

Technical Field

[0001] The invention belongs to the technical field of aquaculture, and particularly relates to a comprehensive management method for preventing and controlling the floating of Vallisneria in river crab ponds during the plum rain season. Background Art

[0002] The Chinese mitten crab (Eriocheir sinensis) is one of my country's most important commercially farmed crabs. Its roe and roe are highly nutritious and delicious, making it a popular choice among consumers. In recent years, the mitten crab aquaculture industry has developed rapidly, with production increasing annually. By 2015, the national total production had reached 800,000 tons.

[0003] Waterweed plays an important role in the growth of river crabs. It not only regulates water quality, provides natural bait, and provides shelter, but also reduces harmful substances such as ammonia nitrogen and nitrite in the water, making it a key factor in the success of river crab farming. Vallisneria natans, a submerged herb, grows rapidly and has a strong regenerative capacity. It effectively inhibits the growth and reproduction of algae and is currently one of the main waterweed species in river crab farming. However, during the rainy season, irrational planting and management of Vallisneria natans can cause it to float. This not only fails to maximize the benefits of waterweed, but also causes deterioration in pond bottom quality and water quality due to the floating and rotting of the waterweed, leading to hypoxia, stress, poisoning, entrapment, landing, and even death in river crabs. Therefore, there is an urgent need for a method that can effectively address the problem of Vallisneria natans floating to improve the success rate of river crab farming. Summary of the Invention

[0004] The first aspect of the present invention aims to provide a comprehensive management method for preventing and controlling the floating of Vallisneria in crab breeding ponds during the plum rain season.

[0005] The purpose of the second aspect of the present invention is to provide an application of the comprehensive management method of the first aspect of the present invention in preventing and controlling the floating of aquatic plants in aquaculture areas.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A first aspect of the present invention provides a comprehensive management method for preventing and controlling the floating of Vallisneria in crab culture ponds during the plum rain season, comprising the following steps:

[0008] Pond renovation: Set up a sloping field in the pond as a planting area for Vallisneria serrata. Ditches are opened around the sloping field to serve as a breeding area for river crabs before Vallisneria serrata sprouts. Green embankments are set up around the ditch to plant Elodea serrata.

[0009] River crab stocking;

[0010] Vallisneria sinensis planting: around the Qingming Festival, Vallisneria sinensis is planted in the fields to regulate the water level;

[0011] Water quality control: After the rainy season, the water level in Bantian is regulated, and the water transparency is controlled;

[0012] Dissolved oxygen management: During the plum rain season, the dissolved oxygen content at the bottom of the pond should be controlled to be greater than 3 mg / L;

[0013] Application of mineral fertilizers: During the rainy season, mineral fertilizers are applied regularly to the Bantian area.

[0014] In some embodiments of the present invention, the area of ​​the slope field accounts for 1 / 4 to 1 / 3 of the total area of ​​the pond.

[0015] In some embodiments of the present invention, the area of ​​the annular ditch accounts for 1 / 4 to 1 / 3 of the total area of ​​the pond.

[0016] In some embodiments of the present invention, the width of the upper opening of the annular ditch is 5 to 9 meters, the width of the lower opening is 4 to 6 meters, and the depth is 45 to 90 cm.

[0017] In some embodiments of the present invention, the width of the upper opening of the annular ditch is 6 to 8 meters, the width of the lower opening is 4 to 5 meters, and the depth is 60 to 70 cm.

[0018] In some embodiments of the present invention, the height of the green ridge is 5 to 10 cm lower than that of the slope.

[0019] In some embodiments of the present invention, the height of the green ridge is 5 to 7 cm lower than that of the slope.

[0020] In some embodiments of the present invention, the river crab seedlings are released into the ring ditch at a density of 1300 to 1700 crabs per mu; the stocking time is late February to early March, and the stocking specification is 5 to 10 g per crab.

[0021] In some embodiments of the present invention, the river crab seedlings are released into the ring ditch at a density of 1400 to 1600 crabs per mu; the stocking time is late February to early March, and the stocking specification is 6 to 8 g per crab.

[0022] In some embodiments of the present invention, the planting of Vallisneria includes mixing Vallisneria seeds with loose soil at a dosage of 0.5 to 0.9 jin per mu, and evenly sprinkling the seeds in the sakata area, with the water level in the sakata controlled at 5 to 15 cm; and raising the water level to 20 to 30 cm after the Vallisneria grows to 3 to 5 cm.

[0023] In some embodiments of the present invention, the planting of Vallisneria includes mixing Vallisneria seeds with loose soil and a small amount of water at a dosage of 0.5 to 0.6 jin per mu, and evenly sprinkling them on the sakata area, with the water level of the sakata controlled at 7 to 12 cm; and raising the water level to 20 to 30 cm after the Vallisneria grows to 3 to 4 cm.

[0024] In some embodiments of the present invention, after the Vallisneria seeds germinate, the insecticide is evenly sprayed.

[0025] In some embodiments of the present invention, the insecticide can be any insecticide currently available that has insecticidal efficiency and is harmless to Vallisneria, such as chloranthine.

[0026] In some embodiments of the present invention, the water quality control includes regulating the water level in Bantian to 30-40 cm and controlling the water transparency to 30-40 cm after entering the plum rain season.

[0027] In some embodiments of the present invention, the water quality control includes regulating the water level in the field to 30-35 cm after entering the plum rain season to ensure the growth space of Vallisneria; controlling the water transparency to 35-40 cm to provide sufficient sunlight for the growth of Vallisneria.

[0028] In some embodiments of the present invention, the dissolved oxygen management includes periodically using potassium bisulfate to oxidize the bottom during the plum rain season to increase the redox potential of the bottom, while maintaining the dissolved oxygen content at the bottom of the pond at 3-5 mg / L.

[0029] In some embodiments of the present invention, the application of the mineral fertilizer comprises applying the mineral fertilizer 2 to 4 times in a dosage of 0.2 to 0.6 kg / mu, 5 to 7 days / time.

[0030] In some embodiments of the present invention, the mineral fertilizer includes trace elements, seaweed polysaccharides, aspartic acid, Ca(HPO4)2, Na2B4O7, Na2MoO4 and glucose.

[0031] In some embodiments of the present invention, the trace elements include zinc, copper, iron, manganese, selenium, magnesium and cobalt.

[0032] In some embodiments of the present invention, the trace elements include 16.50% amino acid zinc, 13.00% amino acid copper, 29.00% amino acid iron, 18.00% amino acid manganese, 9.00% yeast selenium, 12.70% magnesium sulfate and 1.80% cobalt sulfate.

[0033] In some embodiments of the present invention, the mineral fertilizer includes 18% trace elements, 3% seaweed polysaccharide, 2% aspartic acid, 30% Ca(HPO4)2, 4% Na2B4O7, 1.35% Na2MoO4, and 41.65% glucose.

[0034] In some embodiments of the present invention, the river crab includes but is not limited to the Chinese mitten crab, and may also be crayfish, swamp shrimp, etc. grown in other aquatic plants during the breeding process.

[0035] The second aspect of the present invention provides the application of the comprehensive management method of the first aspect of the present invention in preventing and controlling the floating of aquatic plants in aquaculture areas.

[0036] In some embodiments of the present invention, the aquatic plants include aquatic plants commonly found in river crab ponds, such as Elodea and Hydrilla verticillata.

[0037] The beneficial effects of the present invention are:

[0038] The present invention can effectively prevent and control the problem of floating of Vallisneria in the crab pond during the plum rain season through comprehensive management of pond repair, crab seedling release, aquatic plant planting, water quality control, dissolved oxygen management and mineral fertilizer application. Specifically, the planting area and density management of Vallisneria are optimized to reduce the disturbance of the crabs. At the same time, by supplementing mineral fertilizers and adjusting the transparency of the water body, nutrition and light are provided for the growth of the aquatic plant roots, which can effectively promote the growth of the Vallisneria roots and systematically solve the floating problem of Vallisneria. The success rate reaches more than 90%, which has an important promoting effect on improving the pond yield and the quality of Chinese mitten crabs and has good economic benefits. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below through specific examples.

[0040] It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0041] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0042] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0043] Example 1

[0044] A comprehensive management method for preventing and controlling the floating of Vallisneria in river crab ponds during the plum rain season comprises the following steps:

[0045] 1) Prepare the pond for Vallisneria spp. planting: Create a sloping field in the center of the pond for Vallisneria spp., with the field occupying one-third of the total pond area. Create a ditch around the sloping field to serve as a breeding area for river crabs before Vallisneria spp. sprouts. The ditch, occupying one-third of the total pond area, should be 7 meters wide at the top and 4.5 meters wide at the bottom, with a depth of 70 cm. Create a green bank around the pond for planting Elodea spp. The bank should be 5 cm lower than the sloping field to prevent uneven crab distribution and thus hinder the growth of Vallisneria spp.

[0046] 2) Breeding plan: Stocking density (river crabs) is 1,350 per mu, with stocking on February 28 and a stocking size of 8g per crab.

[0047] 3) Aquatic Planting: Around the Qingming Festival, choose a rainy day (April 3, 2024) and plant 0.6 catties / mu of dried Vallisneria serrata seeds in the Bantian planting area. Crush the seeds and mix them with a small amount of water in loose soil. Sprinkle them evenly over the Bantian area. After planting, raise the water level in the Bantian area to 12 cm. Once the Vallisneria serrata grows to 4 cm, raise the water level to 30 cm. On the 20th day after planting (i.e., after the Vallisneria serrata seeds germinate), spray evenly with Caochongjing (purchased from the Zhongyule Biological Flagship Store) to control pests.

[0048] 4) Water Quality Control: After the start of the plum rain season (June 10th), the water level in Bantian was adjusted to 35cm to ensure sufficient growth space for Vallisneria. The plum rain season is when Vallisneria rapidly grows and tillers. During this period, water transparency should be controlled to 40cm to provide ample sunlight for Vallisneria growth.

[0049] 5) Dissolved Oxygen Management: During the rainy season (June 10th - July 10th), use potassium persulfate to oxidize the bottom every six days to increase the redox potential at the bottom. During rainy weather, use bottom aeration or sodium percarbonate aeration tablets to maintain the dissolved oxygen level at the bottom of the pond at 3.5-4.5 mg / L.

[0050] 6) Mineral fertilizer supplement: From June 10 to June 25, use aquatic plant mineral fertilizer three times in a row at a dosage of 0.3 kg / mu, 5 days / time (chelated element package 18%, seaweed polysaccharide 3%, aspartic acid 2%, Ca(HPO4)2 30%; Na2B4O74%; Na2MoO41.35%; glucose 41.65%; among which, the chelated element package is composed of: amino acid zinc 16.50%, amino acid copper 13.00%, amino acid iron 29.00%, amino acid manganese 18.00%, yeast selenium 9.00%, magnesium sulfate 12.70% and cobalt sulfate 1.80%).

[0051] The length of the roots of the pond's Vallisneria and the proportion of floating roots were measured and counted three times on May 20, June 20, and July 20. The specific results are shown in Table 1. In this embodiment, no obvious problem of Vallisneria floating occurred during the plum rain season, and the proportion of Vallisneria floating did not exceed 2% throughout the entire period.

[0052] Table 1 Length and floating ratio of the roots of pond Vallisneria lappa in each embodiment and control example

[0053]

[0054] Example 2

[0055] A comprehensive management method for preventing and controlling the floating of Vallisneria in river crab ponds during the plum rain season comprises the following steps:

[0056] 1) Prepare the pond for Vallisneria planting: Create a sloping field in the center of the pond for Vallisneria planting. The sloping field should occupy one-quarter of the total pond area. Create a ditch around the sloping field to serve as a breeding area for river crabs before Vallisneria sprouts. The ditch should occupy one-third of the pond area, be 8 meters wide at the top and 5 meters wide at the bottom, and 65 cm deep. Create a green bank around the ditch and plant Elodea on March 5th. The bank should be 7 cm lower than the sloping field to prevent uneven crab distribution and thus hinder the growth of Vallisneria.

[0057] 2) Breeding plan: Stocking density (river crabs) is 1,400 per mu, with stocking on February 20 and a stocking size of 7.8g per crab.

[0058] 3) Aquatic Planting: Around the Qingming Festival, choose a rainy day (April 10th) and apply 0.5 catties / mu of sun-dried seeds to the Bantian Vallisneria planted area. Mix the seeds with a small amount of water and soil and evenly spread them over the Bantian area. After planting, raise the water level to 8 cm. Once the Vallisneria has grown to 4 cm, raise the water level to 25 cm. On the 15th day after planting (i.e., after the Vallisneria seeds germinate), spray evenly with Caochongjing to control pests.

[0059] 4) Water Quality Control: After the start of the plum rain season (June 8th), the water level in Bantian was adjusted to 30cm to ensure sufficient growth space for Vallisneria. The plum rain season is when Vallisneria rapidly grows and tillers. During this period, water transparency must be controlled to 35cm to provide ample sunlight for Vallisneria's growth.

[0060] 5) Dissolved Oxygen Management: During the plum rain season (June 5th - July 5th), use potassium persulfate to oxidize the bottom every seven days to increase the redox potential at the bottom. During rainy weather, use bottom aeration or sodium percarbonate aeration tablets to maintain the dissolved oxygen level at the bottom of the pond at 3.2-4.2 mg / L.

[0061] 6) Application of mineral fertilizer: From June 5 to June 20, apply aquatic plant mineral fertilizer three times in a dosage of 0.4 kg / mu, 7 days / time (same as Example 1).

[0062] The length of the roots of the pond's Vallisneria and the proportion of floating roots were measured and counted three times on April 20, May 20, and June 20. The specific results are shown in Table 1. In this embodiment, no obvious problem of Vallisneria floating occurred during the plum rain season, and the proportion of Vallisneria floating did not exceed 3% throughout the entire period.

[0063] Example 3

[0064] A comprehensive management method for preventing and controlling the floating of Vallisneria in river crab ponds during the plum rain season comprises the following steps:

[0065] 1) Prepare the pond for Vallisneria spp.: Create a sloping field in the center of the pond for Vallisneria spp., with the field occupying one-quarter of the pond's total area. Create a ditch around the sloping field to house crabs before Vallisneria spp. sprouts. The ditch should occupy one-third of the pond's total area, with a width of 7.5m at the top and 4.5m at the bottom, and a depth of 70cm. Create a green bank around the pond for Elodea spp., which should be 5cm lower than the sloping field to prevent uneven crab distribution and hinder the growth of Vallisneria spp.

[0066] 2) Breeding plan: Stocking density (river crabs) is 1,350 per mu, with stocking on February 15 and a stocking size of 6.7g per crab.

[0067] 3) Aquatic Planting: Around the Qingming Festival, choose a rainy day (April 20th) and apply 0.6 catties / mu of sun-dried seeds to the Bantian Vallisneria planted area. Mix the seeds with a small amount of water and soil and evenly spread them over the Bantian area. After planting, raise the water level to 7 cm. Once the Vallisneria has grown to 3 cm, raise the water level to 20 cm. On the 20th day after planting (i.e., after the Vallisneria seeds germinate), spray evenly with Caochongjing to control pests.

[0068] 4) Water Quality Control: After the start of the plum rain season (June 10th), the water level in Bantian was adjusted to 32cm to ensure sufficient growth space for Vallisneria. The plum rain season is when Vallisneria rapidly grows and tillers. During this period, water transparency must be controlled to 35cm to provide ample sunlight for Vallisneria's growth.

[0069] 5) Dissolved Oxygen Management: During the plum rain season (June 5th - July 5th), use potassium persulfate to oxidize the bottom every six days to increase the redox potential at the bottom. During rainy weather, use bottom aeration or sodium percarbonate aeration tablets to maintain the dissolved oxygen level at the bottom of the pond at 3.5-5 mg / L.

[0070] 6) Application of mineral fertilizer: From June 3 to June 21, apply aquatic plant mineral fertilizer three times in a dosage of 0.5 kg / mu, 6 days / time (same as Example 1).

[0071] The length of the roots of the Vallisneria in the pond and the proportion of floating were measured and counted three times on April 20, May 20, and June 20. The specific results are shown in Table 1. In this embodiment, no obvious problem of Vallisneria floating occurred during the entire plum rain season, and the proportion of Vallisneria floating did not exceed 2% throughout the entire rainy season.

[0072] Comparative Example 1

[0073] A method for preventing and controlling the floating of Vallisneria in crab ponds during the plum rain season comprises the following steps:

[0074] 1) Improve the pond's Vallisneria planting area: Create a sloping field in the center of the pond for Vallisneria cultivation, with the field occupying one-third of the pond's total area. Create a ditch around the field to serve as a breeding area for river crabs before the Vallisneria sprouts. The ditch should be 5.5 meters wide at the top and 3.5 meters wide at the bottom, with a depth of 90 cm. The ditch should occupy one-fifth of the pond's total area.

[0075] 2) Breeding plan: The stocking density (for river crabs) is 1,500 per mu, with stocking on February 20 and a stocking size of 7g per crab.

[0076] 3) Aquatic Planting: Around the Qingming Festival, choose a rainy day. On April 15th, apply 0.55 catties / mu of water to the Bantian Vallisneria plantation area. Crush the dried seeds and mix with a small amount of water in a loose soil. Sprinkle the seeds evenly over the Bantian area. After planting, increase the water level to 7 cm. Once the Vallisneria has grown to 3 cm, raise the water level to 20 cm. On the 20th day after planting (after the Vallisneria seeds germinate), spray evenly with Caochongjing to control pests.

[0077] 4) Water quality control: After entering the plum rain season (June 10), the water level in Bantian was adjusted to 30cm, and the water transparency was adjusted to 20-30cm.

[0078] 5) Application of mineral fertilizer: Apply aquatic plant mineral fertilizer (potassium dihydrogen phosphate, 0.1 kg / mu) once on April 28.

[0079] The length of the roots of the Vallisneria root and the proportion of floating Vallisneria in the pond were measured and counted three times in a row on May 20, June 20, and July 20. The specific results are shown in Table 1. In this comparison, the problem of Vallisneria floating was obvious throughout the plum rain period, with the floating proportion of Vallisneria reaching 30% throughout the entire period.

[0080] Comparative Example 2

[0081] A method for preventing and controlling the floating of Vallisneria in crab ponds during the plum rain season comprises the following steps:

[0082] 1) Improve the Vallisneria plantation area in the pond: Create a sloping field in the center of the pond for Vallisneria planting. The sloping field should account for one-third of the total pond area. Create a circular ditch around the sloping field to serve as a breeding area for river crabs before the Vallisneria sprouts. The ditch should be 6.0 meters wide at the top and 4 meters wide at the bottom, with a depth of 90 cm. The ditch should account for one-quarter of the total pond area.

[0083] 2) Breeding plan: The stocking density (for river crabs) is 1,600 per mu, with stocking on February 15 and a stocking size of 7.2g per crab.

[0084] 3) Aquatic Planting: Around the Qingming Festival, during rainy weather, apply 0.55 catties / mu of water to the Bantian Vallisneria plantation area on April 20th. Crush the dried seeds and mix with a small amount of water in a loose soil. Sprinkle the seeds evenly over the Bantian area. After planting, increase the water level in the Bantian area to 7 cm. Once the Vallisneria has grown to 3 cm, raise the water level to 20 cm. On the 20th day after planting (after the Vallisneria seeds germinate), spray evenly with Caochongjing to control pests.

[0085] 4) Water quality control: After entering the plum rain season (June 10), the water level in Bantian was adjusted to 25cm, and the water transparency was adjusted to 20-30cm.

[0086] No aquatic plant mineral fertilizers are used during the entire process.

[0087] The length of the roots of the Vallisneria root and the proportion of floating Vallisneria in the pond were measured and counted three times in a row on April 20, May 20, and June 20. The specific results are shown in Table 1. In this comparative example, the problem of Vallisneria floating was obvious throughout the plum rain season, with the floating proportion of Vallisneria reaching 50% throughout the entire period.

[0088] Comparative Example 3

[0089] A method for preventing and controlling the floating of Vallisneria in crab ponds during the plum rain season comprises the following steps:

[0090] 1) Improve the pond's Vallisneria planting area: Create a sloping field in the center of the pond for Vallisneria cultivation, with the field occupying one-third of the pond's total area. Create a ditch around the field to cultivate river crabs before the Vallisneria sprouts. The ditch should occupy one-quarter of the pond's total area. The ditch should be 6.0 meters wide at the top and 4 meters wide at the bottom, with a depth of 90 cm.

[0091] 2) Breeding plan: The stocking density (for river crabs) is 1,600 per mu, with stocking on February 15 and a stocking size of 7.2g per crab.

[0092] 3) Aquatic Planting: Around the Qingming Festival, during rainy weather, apply 0.55 catties / mu of water to the Bantian Vallisneria plantation area on April 20th. Crush the dried seeds and mix with a small amount of water in a loose soil. Sprinkle the seeds evenly over the Bantian area. After planting, increase the water level in the Bantian area to 7 cm. Once the Vallisneria has grown to 3 cm, raise the water level to 20 cm. On the 20th day after planting (after the Vallisneria seeds germinate), spray evenly with Caochongjing to control pests.

[0093] 4) Water quality control: After entering the plum rain season (June 10), the water level in Bantian was adjusted to 25cm, and the water transparency was adjusted to 20-30cm.

[0094] No aquatic plant mineral fertilizers are used during the entire process.

[0095] The length of the roots of Vallisneria in the pond and the proportion of floating Vallisneria were measured and counted three times in a row on April 20, May 20, and June 20. The specific results are shown in Table 1. In this comparison, Vallisneria floating was a significant problem throughout the plum rain season, with the floating proportion reaching 50%.

[0096] While the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A comprehensive management method for preventing and controlling the floating of Vallisneria spp. in river crab breeding ponds during the plum rain season, comprising the following steps: Pond renovation: Set up a sloping field in the pond as a planting area for Vallisneria serrata. Ditches are opened around the sloping field to serve as a breeding area for river crabs before Vallisneria serrata sprouts. Green embankments are set up around the ditch to plant Elodea serrata. Stocking of river crabs; Vallisneria sinensis planting: around the Qingming Festival, Vallisneria sinensis is planted in the fields to regulate the water level; Water quality control: After the rainy season, the water level in Bantian is regulated, and the water transparency is controlled; Dissolved oxygen management: During the plum rain season, the dissolved oxygen content at the bottom of the pond should be controlled to be greater than 3 mg / L; Application of mineral fertilizers: During the rainy season, mineral fertilizers are applied regularly to the Bantian area.

2. The comprehensive management method according to claim 1, characterized in that: The area of ​​the sloped field accounts for 1 / 4 to 1 / 3 of the total area of ​​the pond; and / or, the area of ​​the ring ditch accounts for 1 / 4 to 1 / 3 of the total area of ​​the pond; and / or, the upper width of the ring ditch is 5 to 9 meters, the lower width is 4 to 6 meters, and the depth is 45 to 90 cm; and / or, the height of the green bank is 5 to 10 cm lower than that of the sloped field.

3. The comprehensive management method according to claim 1, characterized in that: The crab seedlings are released into the ring ditch at a density of 1,300 to 1,700 crabs per mu; the crab seedlings are released from late February to early March, and the crab seedlings are weighed at 5 to 10 g per crab.

4. The comprehensive management method according to any one of claims 1 to 3, characterized in that: The planting of Vallisneria includes mixing Vallisneria seeds with loose soil at a dosage of 0.5 to 0.9 jin per mu, and evenly spreading them in the Bantian area. The water level in the Bantian is controlled at 5 to 15 cm; and the water level is raised to 20 to 30 cm after the Vallisneria grows to 3 to 5 cm.

5. The comprehensive management method according to claim 4, characterized in that: After the Vallisneria seeds germinate, the insecticide is evenly sprayed.

6. The comprehensive management method according to any one of claims 1 to 3, characterized in that: The water quality control includes regulating the water level in Bantian to 30-40 cm and controlling the water transparency to 30-40 cm after entering the plum rain season.

7. The comprehensive management method according to any one of claims 1 to 3, characterized in that: The dissolved oxygen management includes regularly using potassium bisulfate to oxidize the bottom during the plum rain season to increase the redox potential of the bottom, while maintaining the dissolved oxygen content at the bottom of the pond at 3-5 mg / L.

8. The comprehensive management method according to claim 7, characterized in that: The mineral fertilizer application includes applying the mineral fertilizer 2 to 4 times in a dosage of 0.2 to 0.6 kg per mu, 5 to 7 days per application.

9. The comprehensive management method according to claim 8, characterized in that: The mineral fertilizer includes trace elements, seaweed polysaccharide, aspartic acid, Ca(HPO4)2, Na2B4O7, Na2MoO4 and glucose; Preferably, the trace elements include zinc, copper, iron, manganese, selenium, magnesium and cobalt.

10. Use of the integrated management method according to any one of claims 1 to 9 in preventing and controlling the floating of aquatic plants in aquaculture areas.

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