Hairy crab breeding system suitable for shallow lakes

Abstract

The hairy crab breeding system suitable for the shallow lake comprises an inner-layer purse net and an outer-layer purse net which are installed in an inward inclined mode, and a waterproof enclosure is arranged at the top end of the inner-layer purse net in a surrounding mode; the inner purse seine is used for breeding hairy crabs; bellamya is bred between the outer layer purse seine and the inner layer purse seine. According to the method, a grass-snail-crab symbiotic system is constructed, the submerged plants provide oxygen, food and attachment substrates for breeding of the bellamya, the bellamya scrapes and eats attachment organisms on the submerged plants, light limitation affecting growth of the submerged plants and harmful influences such as competition of the bellamya and nutritive salt of the attachment organisms are reduced, and growth of the submerged plants is promoted. The submerged plants are also essential plant bait for the growth of the hairy crabs, and the bellamya is natural bait for the hairy crabs. The growth process of the bellamya is a typical carbon sequestration process, the bellamya bred to a certain specification is directly used as bait to be fed to the hairy crabs for eating, and carbon emission which is difficult to avoid in the hairy crab breeding bait transportation and feeding process is reduced.

Description

Technical Field

[0001] The utility model relates to a hairy crab breeding system, in particular to a hairy crab breeding system suitable for shallow lakes, belonging to the technical field. Background Art

[0002] As a famous and high-quality aquatic product, hairy crabs play an important role in adjusting my country's agricultural industrial structure and optimizing residents' dietary structure.

[0003] Therefore, how to achieve ecological breeding, realize low-carbon, sustainable and healthy development of the breeding industry, and realize both economic and ecological benefits is the main task currently facing hairy crab breeding. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a hairy crab breeding system suitable for shallow lakes.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A hairy crab breeding system suitable for shallow lakes comprises an outer seine and an inner seine, wherein the inner seine is installed in an inwardly inclined manner and a watertight partition is provided around the top of the inner seine;

[0007] The inner layer of the seine is used for breeding hairy crabs;

[0008] The area between the outer layer of seine net and the inner layer of seine net is used for breeding ring-edge snails.

[0009] The outer fence and the inner fence are concentric circles, the circumference of the outer fence is 600-1000m, and the interval between the outer fence and the inner fence is 10-15m.

[0010] The inclination angle of the inner layer of the seine relative to the lake bottom is 60-75 degrees.

[0011] The height of the above-mentioned enclosure is 0.5m, and the height of the inner fence is higher than 1.5m.

[0012] The outer layer fence is a water-permeable soft fence made of scraped cloth, and the inner layer fence is a water-permeable soft fence with a pore size of 8±0.5mm.

[0013] A number of bionic water plants are hung on the outer side of the inner layer fence.

[0014] Furthermore, the bionic water plants are in the shape of spiral sheets, and adjacent bionic water plants are spaced 1 meter apart.

[0015] Furthermore, the bionic aquatic plants are attached with ring-shaped snails to trap feed.

[0016] The above-mentioned shallow lake is a lake with a sound ecosystem containing submerged plants. The water depth can be controlled within the range of 0.5-1.5m, the dissolved oxygen is ≥5mg / L, and the submerged plant coverage area in the enclosure area is 70-80%. The submerged plants are one or more of Vallisneria, Elodea, Black Algae, and Ceratophyllum.

[0017] The breeding quantity of the above-mentioned hairy crabs is 500-600 per mu, and the release quantity of ring-edged snails is 200-300 kg per mu.

[0018] The utility model is beneficial in that:

[0019] The utility model is a hairy crab breeding system suitable for shallow lakes. In a shallow lake with a sound ecosystem, two fences are set up to form a fenced area. The fenced area of ​​50-100 mu is used as a unit. Hairy crabs are cultured in the inner fence, and ring-edge snails are cultured in the inner and outer fences. A grass-snail-crab symbiotic system is constructed. Submerged plants provide oxygen, food and attachment substrates for the cultivation of ring-edge snails. The ring-edge snails scrape the attached organisms on the submerged plants, reducing the harmful effects of light limitation and nutrient salt competition with the attached organisms that affect the growth of submerged plants, thereby promoting the growth of submerged plants. At the same time, submerged plants are also indispensable plant bait for the growth of hairy crabs, and ring-edge snails are even more of a high-quality natural bait for hairy crabs. In addition, the growth process of ring-edge snails is a typical carbon fixation process. Ring-edge snails that have been cultured to a certain size are directly fed to hairy crabs as bait, which also reduces the carbon emissions that are inevitable during the transportation and delivery of bait for hairy crab breeding. Submerged plants are used to absorb eutrophic elements in the water during the aquaculture process, and ring-edged snails are used to feed on plankton, plants and organic matter in the water, thereby purifying the aquaculture water.

[0020] The utility model utilizes the food web chain to recycle waste within the ecosystem, greatly reducing the accumulation of large amounts of waste in the breeding environment. It is a low-cost, simple-structured, environmentally friendly, low-carbon and sustainable hairy crab breeding system with strong practicality and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the outer fence and the inner fence;

[0022] Figure 2 This is a diagram of the spiral structure of bionic water plants.

[0023] The meanings of the marks in the attached drawings are as follows: 1. outer fence, 2. inner fence, 3. impermeable partition, 4. bionic aquatic plants. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] The hairy crab breeding system suitable for shallow lakes is composed of a shallow lake with a sound ecosystem, an outer fence 1, an inner fence 2, and bionic aquatic plants 4.

[0027] The enclosure area is set up in shallow lakes with submerged plant coverage of 70-80%, water depth adjustable within the range of 0.5-1.5m, and dissolved oxygen ≥5mg / L. There are no carnivorous fish that feed on ring-shaped snails in the lakes.

[0028] The outer fence has a circumference of 600-1000m and is constructed of permeable soft PVC scraper cloth, secured vertically to the lakebed with piles. This permeable barrier facilitates water exchange between the inner and outer lakes, accelerating the purification of eutrophication caused by hairy crab farming. An inner concentric fence, 10-15m apart, is installed. The inner fence uses permeable soft barriers with a pore size of 8±0.5mm. The inner fence is installed at an inward tilt, with the angle between the tilted surface and the lakebed being 60-75°. The inner fence must be higher than 1.5m and topped with a 0.5m-high impermeable barrier to prevent hairy crabs from escaping.

[0029] Hanging from the outer side of the inner net are several bionic water plants. These plants are made of polypropylene fibers woven into a spiral sheet structure, providing a large attachment surface for the snails to settle and feed. Adjacent bionic water plants are spaced 1 meter apart, and their length is approximately the same as the height of the inner net. Snail trap feed is attached to the bionic water plants. The trap feed can be purchased commercially or made from a mixture of fermented straw and roasted rice bran.

[0030] Control the lake water level at around 1m. In the winter of the year before hairy crab farming, release 200-300kg / mu of young ring-edge snails between the inner and outer enclosures to allow the snails to adapt to growth in the lake so that they can reproduce and lay eggs in the pond around Qingming Festival the following year.

[0031] From January to April of the following year, the water level is maintained at 0.5-0.6 meters. Around March, hairy crab fry are released into the inner netting. A maximum of 500-600 crabs are stocked per acre (approximately 1.5-1.5 kg) of fry are stocked. They should be uniform in size, strong, active, with complete appendages, and free of disease and injury. When the ring-shaped snails reach a shell width of approximately 8 ± 0.5 cm, bait is applied to the bionic aquatic plants. The bait can be purchased commercially or made from a mixture of fermented straw and roasted rice bran. This bait attracts the snails to the inner netting. The inner netting, with its pore size, selects snails with shells 8 mm ± 0.5 mm wide, suitable for hairy crabs. These snails pass through the inner netting and enter the crab breeding area as feed. Larger snails continue to grow and reproduce in the ecosystem between the outer netting, providing a continuous supply of food for the hairy crabs.

[0032] Maintain appropriate water levels in different breeding stages, specifically: 0.5-0.6m from January to April, 0.6-0.7m from May to June, 1-1.5m from July to August, and about 1m from September to December.

[0033] Example 2

[0034] A shallow lake with an imperfect ecology.

[0035] First, build a water ecosystem.

[0036] From the end of February to the beginning of March, the water level was regulated at 50-60cm and aquatic plants were planted; an average of 50 plants of Elodea, 25 plants of Black Algae, and 25 plants of Vallisneria were planted per square meter, with a water plant coverage rate of about 80%. While planting aquatic plants, wild fish and carnivorous fish were removed to prevent wild fish from damaging aquatic plants and subsequent predation by ring-shaped snails.

[0037] After the planting of aquatic plants is completed, freshwater zooplankton or rotifers are released to improve the aquatic ecosystem while providing bait for the release of crab seedlings.

[0038] Then, a fenced area was constructed to release hairy crabs and ring-edged snails.

[0039] Arrange the fence area. The circumference of the outer fence is about 600m. The material is PVC knife-scraped cloth permeable soft fence, which is fixed vertically to the lake bottom with piles. The inner concentric circle fence is set at intervals of 10m. The inner fence material is a permeable soft fence with a pore size of 8±0.5mm, which is installed inwardly tilted. The angle between the inclined surface and the lake bottom is about 75°, and the inner fence needs to be 2m above the water surface. A layer of impermeable fence made of PVC is attached to the top 0.5m to prevent the hairy crabs from escaping.

[0040] Before Qingming Festival, 600 crab seeds are released per mu in the inner net, and about 250 kg per mu of ring-edged snails with a shell width of 5.5-9.5 mm are released between the inner and outer nets. The second release of 250 kg per mu of ring-edged snails will be completed before July.

[0041] On the inner fence, bionic water plants are hung every 1 meter near the outer fence, nearly as high as the net. These bionic water plants are attached with ring-shaped snails to trap feed. The released ring-shaped snails, attracted by the feed, migrate to the inner fence. After being screened by the mesh size of the inner net, snails of appropriate size enter the hairy crab breeding area and become prey for the crabs. Larger snails reproduce in the ecosystem between the inner and outer nets, providing a continuous supply of food for the crabs.

[0042] The area of ​​the fenced area should be 50-100 mu.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the scope of protection of the present invention.

Claims

1. A hairy crab breeding system suitable for shallow lakes, characterized by: The utility model comprises an outer fence and an inner fence, wherein the inner fence is installed in an inwardly inclined manner and a watertight enclosure is provided around the top of the inner fence; The inner layer of the seine is used for breeding hairy crabs; The area between the outer layer of seine net and the inner layer of seine net is used for breeding ring-edge snails.

2. The hairy crab breeding system according to claim 1, characterized in that: The outer fence and the inner fence are concentric circles, the circumference of the outer fence is 600-1000m, and the interval between the outer fence and the inner fence is 10-15m.

3. The hairy crab breeding system according to claim 1, characterized in that: The inner layer of the seine has an inclination angle of 60-75° relative to the lake bottom.

4. The hairy crab breeding system according to claim 1, characterized in that: The height of the enclosure is 0.5m, and the height of the inner fence is higher than 1.5m.

5. The hairy crab breeding system according to claim 1, characterized in that: The outer layer of the fence is a water-permeable soft fence made of scraped cloth, and the inner layer of the fence is a water-permeable soft fence with a pore size of 8±0.5mm.

6. The hairy crab breeding system according to claim 1, characterized in that: A number of bionic water plants are hung on the outer side of the inner layer fence.

7. The hairy crab breeding system according to claim 6, characterized in that: The bionic water plants are in the shape of spiral sheets, and adjacent bionic water plants are spaced 1 meter apart.

8. The hairy crab breeding system according to claim 6, characterized in that: The bionic water plants are attached with ring-shaped snails to trap feed.

9. The hairy crab breeding system according to claim 1, characterized in that: The shallow lake is a lake with a sound ecosystem containing submerged plants, the water depth is controllable within the range of 0.5-1.5m, the dissolved oxygen is ≥5mg / L, the submerged plant coverage area in the enclosure area is 70-80%, and the submerged plants are one or more of Vallisneria, Elodea, Black Algae, and Ceratophyllum.

10. The hairy crab breeding system according to claim 1, characterized in that: The breeding quantity of the hairy crabs is 500-600 per mu, and the stocking quantity of the ring-edge snails is 200-300 kg per mu.

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