Method for inducing soft-shell freshwater prawns

Abstract

The application discloses an inducing method of soft-shell freshwater shrimps, which comprises four steps of selection of freshwater shrimps, cultivation of the freshwater shrimps, ion bath treatment and shell removal, wherein the shell removal of the freshwater shrimps is promoted by adding a shell-removing agent in a cultivation water body and applying a yellow light environment to the freshwater shrimps during the shell removal. The freshwater shrimps are cultivated by the method, so that the freshwater shrimps can be massively shell-removed in a short time, and the finished soft-shell shrimps are obtained, and the proportion of the obtained soft-shell freshwater shrimps reaches more than 80%. The method is simple, high in operability and suitable for small and medium-sized freshwater shrimp cultivation enterprises. The shell-removing agent containing calcium elements, sodium elements and other elements for promoting the growth and shell removal of the freshwater shrimps is added in the cultivation process of the freshwater shrimps, so that the shell removal of the freshwater shrimps is promoted, and the yellow light environment provides a necessary environment for the shell removal of the freshwater shrimps and further promotes the shell removal of the freshwater shrimps.

Description

Technical Field

[0001] This invention belongs to the field of freshwater shrimp farming technology, specifically relating to a method for inducing soft-shelled freshwater shrimp. Background Technology

[0002] Prawns are a highly nutritious and high-quality aquatic product, known for their delicious taste, simple cooking, and convenient consumption, making them suitable for all ages. Soft-shell prawns are a type of prawn. Their intestines are clean, containing no food or feces, and their soft shells are edible and rich in chitin. Chitin has anti-aging properties and helps resist free radical damage, making it very beneficial to the human body. Currently, most prawns consumed are hard-shell prawns, as the hard shells are inedible and discarded, significantly reducing their nutritional value. To create a suitable ecological environment for prawn growth, aquatic plants need to be planted in ponds, allowing the prawns to inhabit, feed, and molt on these plants. Due to individual differences in growth and development, when prawns are harvested, some soft-shell prawns are often present in the catch, but the vast majority are hard-shell prawns, indicating that molting is not synchronized during the farming process. Even prawn larvae stocked in the same batch will molt at different times or in separate batches. Summary of the Invention

[0003] To address the current shortcomings of prawns not being able to molt in a concentrated manner during their growth and development, this invention provides a method for inducing soft-shell prawns. By stimulating and inducing environmental physical and chemical conditions, the method aims to enable the finished prawns to molt in a concentrated manner within a short period of time.

[0004] To achieve the above objectives, the present invention provides a method for inducing soft-shell shrimp, comprising the following steps:

[0005] (1) Selection of shrimp: Among the caught shrimp, select individuals with hard shells and bluish shell color, and discard individuals with lighter body color.

[0006] (2) Shrimp farming: Lower the water temperature to about 15-20 degrees Celsius, put the selected shrimp into it, and then let the temperature rise slowly and naturally for about 12-20 hours, so that the shrimp can mature further.

[0007] (3) Pre-molting treatment: When the water temperature in step (2) is synchronized with the environment, add molting agent to the water body or new water in step (2), feed the shrimp normally, and continue to raise the shrimp in the environment containing molting agent for 48-72 hours.

[0008] (4) Molting: When the shrimp in step (3) do not feed, they are transferred to the molting device to molt. The molting environment of the shrimp is a yellow light environment.

[0009] In one embodiment of the present invention, in step (1), when selecting shrimp, the shrimp are placed in clean water at a depth of about five centimeters, in a place with side lighting near a window indoors, to avoid direct sunlight.

[0010] In one embodiment of the present invention, in step (2), the desquamating agent comprises a calcium salt, a sodium salt, a manganese salt, a zinc salt, and a selenium salt. The calcium salt comprises at least one of calcium bicarbonate, calcium chloride, calcium lactate, and calcium peroxide; the sodium salt comprises at least one of sodium chloride, sodium carbonate, sodium bicarbonate, and sodium percarbonate; the manganese salt comprises manganese chloride or manganese phosphate; the zinc salt comprises at least one of zinc chloride, zinc sulfate, zinc lactate, and zinc citrate; and the selenium salt comprises at least one of sodium selenate, potassium selenate, and sodium selenite.

[0011] In one embodiment of the present invention, in step (2), after adding the desquamating agent, the calcium ion concentration in the water is 50-100 mg / L, the sodium ion content is 10 mg / L, and the ion content in the trace salt is added.

[0012] In one embodiment of the present invention, the molting device includes a main water tank and a control water tank, with an outlet pipe connecting the main water tank and the control water tank. A return water pipe is also provided outside the main water tank, with the other end of the return water pipe connected to the control water tank. During the molting process of the shrimp, the shrimp are first transferred to the main water tank, and a yellow light environment is set outside the main water tank to allow the shrimp to complete molting within the main water tank. The control water tank is equipped with a temperature control device and an aeration device. The function of the control water tank includes, on the one hand, connecting the main water tank and the control water tank through the outlet and return water pipes, allowing water to circulate within both tanks, providing the necessary environment for the growth and molting of the shrimp; on the other hand, the space and aeration device within the control water tank also provide oxygen for the growth and molting of the shrimp, and allow the shrimp to grow in a suitable temperature environment.

[0013] In one embodiment of the present invention, in step (4), the molting of the shrimp is completed in the main water tank, and a yellow light environment is set in the main water tank. The yellow light environment is set in one of the following ways: setting yellow LED lights, setting a yellow shield outside the white light, or applying a layer of yellow transparent coating on the white light lampshade.

[0014] In one embodiment of the present invention, in step (4), the light intensity of the yellow light is 0.05 to 0.1 lux, and the shelling time is 12 to 24 hours.

[0015] In one embodiment of the present invention, in step (4), the water temperature during the molting of the shrimp is 25-30°C and the dissolved oxygen content is greater than 8 mg / L.

[0016] In one embodiment of the present invention, the water depth in the main pool is 1m, and the stocking density of freshwater shrimp is 500g / m³. 2 .

[0017] The present invention also discloses a soft-shelled shrimp obtained using the above-described induction method.

[0018] The present invention also provides an application of the above-mentioned soft-shell shrimp in the food and pharmaceutical fields.

[0019] The beneficial effects of this invention are:

[0020] (1) The method of this invention can cultivate shrimp in a short time, thereby obtaining a large number of soft-shelled shrimp. The method is simple, highly operable, and suitable for small and medium-sized shrimp farming enterprises.

[0021] (2) Adding a molting agent during the shrimp farming process. The molting agent contains elements such as calcium and sodium that promote shrimp growth and molting, which helps promote concentrated molting of shrimp. The yellow light environment provides the necessary environment for shrimp molting, which can further promote shrimp molting.

[0022] (3) By improving the nutritional and environmental conditions during the shrimp farming and molting process, the present invention enables shrimp to molt in a concentrated manner in a short period of time. Among the shrimp cultivated using the method of the present invention, the proportion of soft-shelled shrimp is more than 80%. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the shelling device of the present invention.

[0024] In the diagram: 1. Main water tank; 2. Control water tank; 3. Outlet pipe; 4. Return pipe. Detailed Implementation

[0025] To make the objectives, 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. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] A method for inducing soft-shelled shrimp includes the following steps:

[0028] (1) Selection of shrimp: Among the caught shrimp, select those with hard shells and bluish shell color, and discard those with lighter body color. When selecting, place the shrimp in clean water at a depth of about five centimeters, in a window with side light indoors, and avoid direct sunlight.

[0029] (2) Aquaculture treatment: Lower the water temperature to 15-20℃, put the selected shrimp into it, and then let the temperature rise slowly and naturally for 12-20 hours, so that the shrimp can be further matured.

[0030] (3) Ion bath treatment: When the water temperature is synchronized with the environment, calcium bicarbonate, sodium chloride, manganese chloride, zinc chloride, and sodium selenate are added to the water to maintain the calcium ion concentration at 52 mg / L, sodium ion concentration at 10 mg / L, manganese ion concentration at 0.1 mg / L, zinc ion concentration at 0.8 mg / L, and selenium ion concentration at 0.02 mg / L. The shrimp are cultured in this bath for 48-72 hours. Normal feeding can be given at the beginning of this stage. If no feeding behavior is observed later, the shrimp are transferred to the molting pond in the evening to molt.

[0031] (4) Shelling: Shelling is completed in a shelling device, such as... Figure 1 As shown, the molting device includes a main water tank 1 and a control water tank 2. An outlet pipe 3 connects the main water tank 1 and the control water tank 2. A return water pipe 4 is connected to the outside of the main water tank 1, and the other end of the return water pipe 4 is connected to the control water tank 2. The water in the tanks can circulate between the main water tank and the control water tank. The main water tank is 1 meter deep, and the stocking density of the shrimp is 500g / m³. 2 The water temperature should be controlled at 25-30℃, and the dissolved oxygen content should be greater than 8mg / L. After transferring the shrimp to the main pond, yellow LED lights should be installed in the main pond to maintain a light intensity of 0.05-0.1 lux.

[0032] The following morning, the prawns were caught, and the shells and a few individuals that had not molted were removed. Soft-shell prawns accounted for 83% of the total. The soft-shell prawns were transported in a single layer at 4°C and under humid conditions for 8 hours to keep them fresh.

[0033] Example 2

[0034] A method for inducing soft-shelled shrimp includes the following steps:

[0035] (1) Selection of shrimp: Among the caught shrimp, select those with hard shells and bluish shell color, and discard those with lighter body color. When selecting, place the shrimp in clean water at a depth of about five centimeters, in a window with side light indoors, and avoid direct sunlight.

[0036] (2) Aquaculture treatment: Lower the water temperature to 15-20℃, put the selected shrimp into it, and then let the temperature rise slowly and naturally for 12-20 hours, so that the shrimp can be further matured.

[0037] (3) Ion bath treatment: When the water temperature is synchronized with the environment, calcium bicarbonate, sodium chloride, manganese chloride, zinc chloride, and sodium selenate are added to the water to maintain the calcium ion concentration at 100 mg / L, sodium ion concentration at 10 mg / L, manganese ion concentration at 0.2 mg / L, zinc ion concentration at 1.2 mg / L, and selenium ion concentration at 0.04 mg / L. The shrimp are cultured in this bath for 48-72 hours. Normal feeding can be given at the beginning of this stage. If no feeding behavior is observed later, the shrimp are transferred to the molting pond in the evening to molt.

[0038] (4) Shelling: Shelling is completed in a shelling device, such as... Figure 1 As shown, the molting device includes a main water tank 1 and a control water tank 2. An outlet pipe 3 connects the main water tank 1 and the control water tank 2. A return water pipe 4 is connected to the outside of the main water tank 1, and the other end of the return water pipe 4 is connected to the control water tank 2. The water in the tanks can circulate between the main water tank and the control water tank. The main water tank is 1 meter deep, and the stocking density of the shrimp is 500g / m³. 2 The water temperature is controlled at 25-30℃, and the dissolved oxygen content is greater than 8mg / L. After transferring the shrimp to the main pond, a yellow environment is set up in the main pond, that is, a layer of yellow transparent paint is applied to the outside of the white light cover, and the light intensity is maintained at 0.05-0.1 lux.

[0039] The following morning, the prawns were caught, and the shells and a few individuals that had not molted were removed. Soft-shell prawns accounted for 89% of the total. The soft-shell prawns were transported in a single layer at 4°C and under humid conditions for 8 hours to keep them fresh.

[0040] The specific embodiments described above are for illustrative purposes only and are not intended to limit the scope of the invention. Obvious variations or modifications derived from the spirit of the invention are still within the protection scope of the invention.

Claims

1. A method for inducing soft-shelled shrimp, characterized in that, Includes the following steps: (1) Selection of shrimp: Among the harvested shrimp, select individuals with hard shells and bluish shell color; (2) Rapeseed farming: Lower the water temperature to 15-20℃, put the selected prawns into it, and then let the temperature rise slowly and naturally for 12-20 hours, so that the prawns can further mature. (3) Pre-molting treatment: When the water temperature in step (2) is synchronized with the environment, add molting agent to the water in step (2), feed the shrimp normally, and continue to raise the shrimp in the environment containing molting agent for 48-72 hours. After adding molting agent, the concentration of calcium ions in the water is 50-100 mg / L, the concentration of sodium ions is 10 mg / L, the concentration of manganese ions is 0.1-0.2 mg / L, the concentration of zinc ions is 0.8-1.2 mg / L, and the concentration of selenium ions is 0.02-0.04 mg / L. (4) Shedding: When the shrimp in step (3) does not feed, it is transferred to the molting device to molt. The molting environment of the shrimp is a yellow light environment; the light intensity of the yellow light is 0.05~0.1 lux.

2. The induction method according to claim 1, characterized in that, The shell-removing device includes a main water tank and a control water tank. A water outlet pipe is connected between the main water tank and the control water tank. A water return pipe is connected to the outside of the main water tank, and the other end of the water return pipe is connected to the control water tank.

3. The induction method according to claim 1, characterized in that, In step (4), the molting of the shrimp is completed in the main water tank. The yellow light environment is set in the main water tank. The yellow light environment is set in one of the following ways: setting yellow LED lights, setting a yellow shield outside the white light, or applying a layer of yellow transparent paint to the white light lampshade.

4. The induction method according to claim 1, characterized in that, In step (4), the water temperature during the molting of the shrimp is 25~30℃ and the dissolved oxygen content is greater than 8mg / L.

5. The induction method according to claim 2, characterized in that, The main pool has a water depth of 1 meter, and the stocking density of freshwater shrimp is 500 g / m³. 2 .

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