Method for breeding eriocheir sinensis with oyster shells

Abstract

The invention discloses a method for culturing Eriocheir sinensis with oyster shells, which comprises the following steps: S1, pretreating a crab pond, and laying a microporous oxygenation pipeline; s2, collecting the waste oyster shells, and performing cleaning, disinfection and drying treatment; s3, the oyster shells treated in the step S2 are stacked in a long ridge shape in the crab pond in the direction parallel to the micropore oxygenation pipeline, and the whole crab pond is disinfected; s4, waterweed is planted in the oyster shell ridge direction in the middle ten days of January; s5, crab species are stocked in early February, so that the environment richness of the crab pond is improved, self-killing of the river crabs is reduced, the survival rate is increased, and the adult crab breeding technology is more environmentally friendly and efficient.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, specifically to a method for using oyster shells in the farming of Chinese mitten crabs. Background Technology

[0002] Oyster shells are the shells of oysters such as the Pacific oyster, the Giant oyster, and the Dalian Bay oyster. They are irregularly oval or triangular in shape, varying in size, generally 10-20 cm long, 5-10 cm wide, and 1-3 cm thick. They consist of two valves: the lower valve (left) is larger and thicker, serving an attachment function, while the upper valve (right) is slightly flattened. The outer surface is mostly gray, layered, and has curved, rough textures; the inner surface is milky white, smooth, and glossy. The main component is calcium carbonate, accounting for 80-95%, with small amounts of magnesium, aluminum, silicon, and iron oxide.

[0003] Currently, most crab farmers use Elodea, Hydrilla verticillata, and Vallisneria natans as the main aquatic plants in their crab ponds. These plants not only purify the water but also provide habitats, hiding places, and molting areas for the crabs, which is beneficial for crab farming. However, in recent years, the stocking density of crabs has increased, and coupled with the crabs' fighting, territorial disputes, and cannibalistic behaviors, the survival rate and final recapture rate are far lower than before. The environmental carrying capacity provided by the crab ponds and aquatic plants alone is no longer sufficient for high-density crab farming. Summary of the Invention

[0004] In order to overcome the shortcomings of the above-mentioned related technologies, this application provides a method for using oyster shells in the farming of Chinese mitten crabs. Adding waste oyster shells to the crab pond can improve the environmental richness of the crab pond, reduce cannibalism among crabs, increase the survival rate, and promote a greener and more efficient crab farming technology.

[0005] This application provides a method for using oyster shells in the farming of Chinese mitten crabs, including the following steps: S1 Crab pond pretreatment, and laying of microporous oxygenation pipes; S2 collects waste oyster shells and cleans, disinfects, and dries them; S3 The oyster shells treated in step S2 are piled up in long ridges along the microporous oxygenation pipe in the crab pond, and the entire crab pond is disinfected. Elodea was planted along the oyster shell ridges in mid-January in S4; S5 released crab seedlings in early February.

[0006] Preferably, the crab pond is 1.3-1.7 meters deep, with a flat bottom, clay as the substrate, and the silt thickness at the bottom not exceeding 10 centimeters. The pond banks are protected by slopes and equipped with escape prevention facilities, micropore aeration facilities, and waterwheel aeration facilities.

[0007] Preferably, the microporous aeration facility is equipped with 0.3 to 0.5 kilowatts per mu, and the waterwheel aeration facility is equipped with 0.2 kilowatts per mu.

[0008] Preferably, step S2 specifically involves: placing the collected oyster shells in an empty pond, soaking and rinsing them multiple times to remove impurities, adding 100 kg of bleaching powder per acre, soaking and disinfecting for 7 days, and then drying them for later use.

[0009] Preferably, in step S3, the oyster shells are piled up in long ridges, with a ridge width of 0.9-1.1 meters, a ridge height of 25-35 centimeters, and a ridge spacing of 9-11 meters.

[0010] Preferably, the disinfection of the entire crab pond in step S3 is as follows: in early January, the pond water level is filled, and 150-200 kg of quicklime per mu is slurried and sprinkled throughout the pond for disinfection.

[0011] Preferably, in step S4, Elodea is planted 0.9-1.1 meters away from both sides of the long ridge formed by oyster shells, with a plant spacing of 1.5-2.5 meters. 20 days before the crab seedlings are released, the water level in the crab pond is increased to 40-50 cm, and fermented organic fertilizer is applied at a rate of 150-200 kg per mu to cultivate phytoplankton.

[0012] Preferably, in step S5, crab seedlings are released in early February. The crab seedlings are of uniform size, with complete appendages, robust physique, and agile movement. After being disinfected with 3%-5% saline solution for 15 minutes, the crab seedlings are released at a rate of 1400-1600 per acre.

[0013] Compared with related technologies, the present invention has the following advantages: Adding oyster shells to crab ponds for the cultivation of Chinese mitten crabs creates porous ridges that enhance the environmental richness of the ponds. This provides crabs with more habitats, hiding places, and molting sites, reducing cannibalism and increasing survival rates by approximately 13% compared to ordinary crab ponds. The main component of oyster shells is calcium carbonate, which releases calcium ions upon natural decomposition, providing the crabs with the calcium necessary for growth and development. Oyster shell ridges also provide places for crabs to climb, keeping them away from bottom sediment layers composed of uneaten feed, crab feces, dead algae, aquatic plants, and microorganisms. This sediment layer contains many harmful substances, and oyster shell ridges offer a healthier environment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the long ridges formed by oyster shells and the planting location of Elodea in Example 1. Detailed Implementation

[0015] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0016] The present invention will be further described in detail below with reference to specific embodiments.

[0017] Example 1 At the Yangzhou base of the Jiangsu Provincial Freshwater Fisheries Research Institute on the banks of the Yangtze River, three rectangular ponds, each 2.5 mu (approximately 0.16 acres) in area and about 1.5 meters deep, were selected. The pond bottoms are flat, with silt thickness not exceeding 10 centimeters. The pond banks are reinforced with sturdy, leak-proof embankments that retain water well. Escape-prevention measures are implemented around the pond banks using 60-centimeter-high agricultural-grade thickened polyethylene film and netting. A water source pond from the Yangtze River provides ample water of good quality. The inlet and outlet are located on both sides of the pond and are securely secured with netting. The inner end of the inlet is filtered using double-layered 80-mesh silk bags to prevent wild fish and other external predators from entering the crab ponds. Each crab pond is equipped with one 3-kilowatt microporous aeration system and two 1-kilowatt waterwheel aeration systems.

[0018] Oyster shells are collected from catering companies or aquaculture farms that produce oyster shell waste. The oyster shells collected initially are placed in an empty pond and soaked and rinsed multiple times to remove impurities, while retaining some oyster meat. 100 kg of bleaching powder is added per acre and soaked for disinfection for 1 week. After drying, they are ready for use.

[0019] In early December, the pond is exposed to the sun for about a month to allow the bottom mud to oxidize completely. During this period, excess bottom mud is removed, and the mud thickness is controlled to not exceed 10 cm. At the end of December, along the parallel direction of the microporous aeration pipe, the treated oyster shells are piled into long ridges, about 1 meter wide and 30 cm high, with ridges spaced 10 meters apart. In early January, the pond is filled with water, and 150-200 kg of quicklime per acre is used to make a slurry and sprinkled throughout the pond for disinfection.

[0020] In mid-January, plant Elodea about 1 meter apart on both sides of the oyster shell mound, with a plant spacing of 2 meters, forming an arrangement of aquatic plants-oyster shells-aquatic plants (e.g. Figure 1 (As shown). Subsequently, fermented organic fertilizer was applied to the entire pond to cultivate phytoplankton.

[0021] In early February, 1,500 crab seedlings are released per mu (approximately 0.16 acres). The crab seedlings must have intact appendages and be healthy and active.

[0022] Comparative Example 1 The long rows formed by stacking oyster shells were replaced with Elodea nuttallii with a plant spacing of 2 meters in Example 1, and the rest was the same as in Example 1. When the crabs were fed and managed according to normal breeding standards, the survival rate of adult crabs in Example 1 was about 13% higher than that in Comparative Example 1 when the adult crabs were harvested in November.

[0023] Those skilled in the art will readily understand that the above description is merely an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0024] The above description is merely a specific embodiment of this application. However, the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for using oyster shells in the farming of Chinese mitten crabs, characterized in that, Includes the following steps: S1 Crab pond pretreatment, and laying of microporous oxygenation pipes; S2 collects waste oyster shells and cleans, disinfects, and dries them; S3 The oyster shells treated in step S2 are piled up in long ridges along the microporous oxygenation pipe in the crab pond, and the entire crab pond is disinfected. Elodea was planted along the oyster shell ridges in mid-January in S4; S5 released crab seedlings in early February.

2. The method for using oyster shells in the farming of Chinese mitten crabs according to claim 1, characterized in that, The crab pond is 1.3-1.7 meters deep, with a flat bottom made of clay. The silt at the bottom of the pond is no more than 10 centimeters thick. The pond banks are protected by slopes and equipped with escape prevention facilities, micropore aeration facilities, and waterwheel aeration facilities.

3. The method for using oyster shells in the cultivation of Chinese mitten crabs according to claim 2, characterized in that, The microporous aeration equipment is equipped with 0.3 to 0.5 kilowatts per mu, and the waterwheel aeration equipment is equipped with 0.2 kilowatts per mu.

4. The method for using oyster shells in the farming of Chinese mitten crabs according to claim 1, characterized in that, Step S2 is as follows: Place the collected oyster shells in an empty pond, soak and rinse them several times to remove impurities, add 100 kg of bleaching powder per acre, soak and disinfect for 7 days, and then dry them for later use.

5. The method for using oyster shells in the cultivation of Chinese mitten crabs according to claim 1, characterized in that, In step S3, the oyster shells are piled up in long ridges, with a ridge width of 0.9-1.1 meters, a ridge height of 25-35 centimeters, and a ridge spacing of 9-11 meters.

6. The method for using oyster shells in the farming of Chinese mitten crabs according to claim 1, characterized in that, The specific steps for disinfecting the entire crab pond in step S3 are as follows: In early January, fill the pond to the maximum water level and apply 150-200 kg of quicklime per acre to the entire pond for disinfection.

7. The method for using oyster shells in the farming of Chinese mitten crabs according to claim 1, characterized in that, In step S4, Elodea is planted 0.9-1.1 meters away from both sides of the long ridges formed by oyster shells, with a plant spacing of 1.5-2.5 meters. 20 days before the crab seedlings are released, the water level in the crab pond is increased to 40-50 cm, and fermented organic fertilizer is applied at a rate of 150-200 kg per mu to cultivate phytoplankton.

8. The method for using oyster shells in the farming of Chinese mitten crabs according to claim 1, characterized in that, In step S5, crab seedlings are released in early February. The crab seedlings are uniform in size, have complete appendages, are robust, and are agile. After being disinfected with 3%-5% saline solution for 15 minutes, the crab seedlings are released at a rate of 1400-1600 per acre.

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