Device and method for hatching opsariichthys bidens

Abstract

The invention discloses a device and a method for hatching opsariichthys bidens, and particularly relates to the field of opsariichthys bidens hatching. Wherein the hatching device comprises a hatching pond and a precipitation filtering pond. The sedimentation and filtration tank comprises a filter screen and an aeration anti-sedimentation mechanism; the aeration anti-settling mechanism comprises a breather pipe and an air bag, the breather pipe is communicated with the air bag, the air bag is arranged above the filter screen, and an air outlet is formed in the side end of the air bag; the filter screen comprises a fixed extension part, an upper filter part, a lower filter part and a dirt collecting part, a fixed ring is arranged at the side end of the sedimentation filter tank, the fixed extension part is fixedly placed above the fixed ring, the lower filter part is fixedly inserted into the dirt collecting part, and the filter screen body is in threaded connection with the dirt collecting part. According to the device, gas is introduced above the filter screen, and dirt is prevented from being accumulated on the filter screen in an aeration manner to cause blockage of the filter screen, so that the quality of incubated opsariichthys bidens is improved. Meanwhile, by means of the opsariichthys bidens hatching technology, the survival rate of opsariichthys bidens in the hatching stage and the fry breeding stage can be further increased.

Description

Technical Field

[0001] The present application relates to the technical field of hatching carp, and in particular to a device and method for hatching carp. Background Art

[0002] The Makou fish is commonly known as flower fork fish, peach blossom fish, horse mouth, wide mouth, etc. There is a gap on each side of the upper jaw edge, which is just embedded by the protrusion of the lower jaw, and it looks like a horse mouth, so it is called "Makou fish". It belongs to the Cyprinidae Cyprinidae genus of the Cypriniformes order. It is a small carnivorous omnivorous fish living in streams. It is distributed in all large and small tributaries in the upper reaches of various water systems in Zhejiang Province. It is the main species cultivated in the mountainous areas of Zhejiang Province. Because the Makou fish has high requirements for water quality, it is a fish that likes cold water and feeds mostly on aquatic animals, small fish and shrimps, so its meat is fat and tender, soft and smooth, with a unique fish flavor and high nutritional value, and is quite popular among domestic and foreign consumers.

[0003] In order to ensure the clean water quality during the hatching process of the black carp, most of the water treatment processes are equipped with a dirt sedimentation tank and a filter tank to filter out the black carp's excrement or dust. However, during the process of sedimentation and filtration, the black carp's excrement or dust easily accumulates on the filter net, forming a dirt layer, which causes the mesh of the filter net to be clogged, thereby affecting the water quality cleaning process of the hatched black carp. Therefore, how to combine artificial breeding technology and hatching equipment to improve the artificial hatching rate of black carp by multiple factors is an urgent problem to be solved by technicians. Summary of the invention

[0004] The present invention provides a device for hatching black carp, which prevents dirt from accumulating on the filter screen and causing blockage by introducing gas above the filter screen in the form of aeration, thereby improving the water quality for hatching black carp. At the same time, the black carp hatching technology provided by the present invention can further improve the survival rate of black carp in the hatching and fry breeding stages.

[0005] The objective of the present invention is achieved through the following technical solutions: A device for hatching carp comprises a hatching pool and a sedimentation and filtration pool, wherein the hatching pool and the sedimentation and filtration pool are connected.

[0006] The sedimentation filtration tank includes a filter screen and an aeration and anti-sedimentation mechanism; the aeration and anti-sedimentation mechanism includes a vent pipe and an air bag, the vent pipe and the air bag are connected, the air bag is placed above the filter screen, and an air outlet is provided at the side end of the air bag; the filter screen includes a fixed extension part, an upper filter part, a lower filter part and a dirt collection part, a fixed ring is provided at the side end of the sedimentation filtration tank, the fixed extension part is fixedly placed above the fixed ring, the lower filter part is plugged and fixed to the dirt collection part, and the filter screen body is screwed to the dirt collection part.

[0007] Among them, by setting an aeration anti-sedimentation mechanism in the sedimentation and filtration tank, the excrement of the fry can be prevented from settling near the filter net and directly adhering to the filter net, thereby clogging the mesh of the filter net and making it lose its water filtering function.

[0008] Preferably, the aeration and anti-agglomeration mechanism further comprises a pressure-supplying assembly, wherein the pressure-supplying assembly comprises a pressure-applying rod, an inner fixing ring, an outer fixing ring and an upper scraper; The upper ends of the inner and outer fixed rings are provided with corresponding sliding grooves adapted for sliding of a pressure rod, one end of the pressure rod contacts the bottom side of the airbag, and the other end is fixed to an upper scraper, and the lower end of the upper scraper contacts the upper filter portion.

[0009] Among them, by setting up a pressure supply component, pressure can be applied to the side end of the airbag, so that the gas flows out of the airbag faster, thereby accelerating the water flow and preventing dirt from quickly settling near the filter.

[0010] Preferably, a limiting groove is provided on the groove wall of the sliding groove, and correspondingly, a limiting rib is provided on the side end of the pressure rod.

[0011] Preferably, a rubber scraping strip is provided at the lower end of the upper scraper.

[0012] Preferably, the aeration and anti-agglomeration mechanism further comprises a dirt scraping assembly, wherein the dirt scraping assembly comprises a driving wheel, a slide rail rod, a sliding rod, an arc-shaped scraper and a rotating driving motor; The rotary drive motor is installed at the bottom end of the sedimentation and filtration tank, and the output end of the rotary drive motor is fixed to the driving wheel; the sliding rod is provided with a guide protrusion, and correspondingly, the driving wheel is provided with an arc groove adapted to the sliding of the guide protrusion, the sliding rod can slide on the slide rail rod, the free end of the sliding rod is fixed to the arc scraper, and the lower end of the arc scraper is in contact with the lower filter part.

[0013] The dirt scraping component can scrape off the dirt deposited on the filter to prevent it from accumulating and adhering to the filter.

[0014] Preferably, the aeration and anti-agglomeration mechanism further comprises a linkage rotation component, wherein the linkage rotation component comprises: A lower transmission wheel, a synchronous rotating rod, an upper transmission wheel, a driving auxiliary wheel, a rotating wheel and a supporting rod; The lower transmission wheel and the synchronous rotating rod are synchronously connected through the synchronous rotating rod, and the lower transmission wheel and the driving wheel are meshingly connected; one end of the support rod is fixed to the driving wheel, and the other end is rotationally connected to the driving auxiliary wheel, the upper transmission wheel and the driving auxiliary wheel are meshingly connected, and the rotating wheel and the driving auxiliary wheel are meshingly connected; the side end of the pressure rod is provided with a transmission tooth portion, and the rotating wheel and the pressure rod are meshingly connected.

[0015] The function of the linkage rotating assembly is mainly to transmit the excrement so that the arc scraper 5 and the upper scraper 13 can cooperate with each other to scrape the excrement off the filter screen.

[0016] Preferably, a cover is detachably provided at the upper end of the sedimentation and filtration tank, and the incubation tank is connected to a plurality of water outlet pipes, which are correspondingly connected to the lower end of the incubation tank.

[0017] The present invention also provides a technique for hatching black carp, which comprises the following steps: S01. Inducing labor The time for inducing spawning is from May to July, and the water temperature is 21℃~30℃; Select large, strong, uninjured broodstock with well-developed gonads, and pair them up in a female-to-male ratio of 1:1 to 1.5; Using the intrathoracic injection method, female fish were injected with 1000 IU to 2000 IU of human chorionic gonadotropin and 5µg to 10µg of luteinizing hormone-releasing hormone No. 2 per kilogram of body weight at the base of the pectoral fin. The dose for male fish was halved, and an oxytocin was injected once.

[0018] S02, Spawning After the injection of the oxytocin, 40 to 50 groups of broodstock are placed in each hatching cycle, and a net is placed over the hatching pool or hatching tank to keep it flushed. 5 to 10 hours after estrus and spawning, the broodstock are caught, the fertilized eggs are brushed off and collected, and then put back into the hatching pool or hatching tank with water for incubation.

[0019] S03, Incubation Hatching bucket 3×10 5 Particles / m 3 ~5×10 5 Particles / m 3 , the fertilized egg hatches out of the membrane after 24 h to 36 h; 2 to 3 days after the fry emerge from the membrane, when the swim bladder is formed and they can swim horizontally in the water, they can emerge from the water and enter the fry cultivation stage.

[0020] S04, Summer flower fish breeding 10-15 days before stocking, disinfect the pond with 75-150 kg / mu of quicklime; 2 to 3 days after disinfection, inject 40 to 50 cm of new water filtered through a 60-80 mesh silk sieve, apply 300 to 400 kg of fermented organic fertilizer per mu, and pile them around the pond in the submerged areas. When the average length of the fry reaches more than 2.5 cm, they can be removed from the pond and enter the fish seed breeding stage.

[0021] S05. Cultivation of mackerel When the fry grow to 3cm, they are acclimated and fed with micro-particle floating pellet feed with protein content greater than 42%; During the entire breeding process, new water is added every 2 to 3 days, 15 cm each time. In the later stage of breeding, the water is changed every 7 days, one-fifth of the pond water is changed each time. The net is pulled to exercise and measure the fry. When the fry grow to 4 cm, the fry are divided into ponds for large-scale breeding.

[0022] Preferably, in step S04, the stocking density of fry is 100,000 to 200,000 fry per mu.

[0023] Compared with the prior art, the advantages or beneficial effects of the technical solution of the present application include: By adding an aeration and anti-sedimentation mechanism near the filter, it is not easy for fish excrement or dust to settle into a soil layer here, causing large-area clogging of the filter mesh.

[0024] By adding an aeration and anti-sedimentation mechanism near the filter, the water flow rate can be accelerated, which is beneficial for the water to flow through the filter and achieve sedimentation purification of the water quality.

[0025] The filter net is divided into an upper filter part and a lower filter part, which can filter and purify water according to different filtering standards. For example, the upper filter part can filter out large particles of impurities or debris, while the lower filter part can filter out dust or excrement.

[0026] The project implementation site has abundant water resources and excellent water quality. The wild black carp germplasm resources are not contaminated by foreign genes, so pure indigenous varieties can be obtained, which is beneficial to the protection of the original species of black carp germplasm resources. Through artificial breeding technology, the artificial hatching rate of breeding fish can be significantly improved. During the water flower to summer flower breeding stage, the survival rate can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A technology roadmap for the hatchery method of the mackerel; Figure 2 This is an application scenario diagram of a device for hatching mackerel; Figure 3 It is a schematic diagram of the cross-sectional structure of the sedimentation and filtration tank; Figure 4 It is a structural schematic diagram of the pressure supply component; Figure 5 for Figure 4 A magnified view of part A in FIG. Figure 6 It is a schematic diagram of the structure of the dirt scraping component; Figure 7 for Figure 6 A magnified view of part B in FIG. Figure 8 The structural diagram of the dirt scraping component (arc scraper unfolded state).

[0028] In the figure: 1, air bag, 3, outer fixed ring, 4, inner fixed ring, 5, arc scraper, 6, sliding rod, 7, slide rail rod, 8, lower transmission wheel, 9, synchronous rotation rod, 10, upper transmission wheel, 11, pressure rod, 12, limiting rib, 13, upper scraper, 14, scraper strip, 15, driving wheel, 16, arc groove, 17, guide convex part, 18, rotating wheel, 19, auxiliary driving wheel, 20, lower filter part, 21, dirt collecting part, 22, fixed extension part, 23, upper filter part, 24, ventilation pipe, 25, sedimentation filter tank, 26, fixed ring, 27, filter net, 28, cover body, 29, incubation tank. DETAILED DESCRIPTION

[0029] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of the present application and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the protection scope of the present application.

[0030] It should be clear that the embodiments described below are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by technicians in the relevant field without making creative work are within the scope of protection of the present application. Example 1

[0031] like Figure 2-Figure 7 As shown, a device for hatching black carp includes a hatching pool 29 and a sedimentation and filtration pool 25, and the hatching pool 29 and the sedimentation and filtration pool 25 are connected.

[0032] The sedimentation filter tank 25 includes a filter screen 27 and an aeration and anti-sedimentation mechanism; the aeration and anti-sedimentation mechanism includes a vent pipe 24 and an air bag 1, the vent pipe 24 and the air bag 1 are connected, the air bag 1 is placed above the filter screen 27, and the side end of the air bag 1 is provided with an air outlet 2; the filter screen 27 includes a fixed extension part 22, an upper filter part 23, a lower filter part 20 and a dirt collection part 21, and the side end of the sedimentation filter tank 25 is provided with a fixed ring 26, the fixed extension part 22 is fixedly placed above the fixed ring 26, the lower filter part 20 is plugged and fixed to the dirt collection part 21, and the filter screen body is screwed to the dirt collection part 21.

[0033] Internal component connection relationship and working principle of aeration and anti-agglomeration mechanism: like Figure 3As shown, the air bag 1 is connected to the vent pipe 24, and the vent pipe 24 can be an external air pump. By supplying air to the water body, the benefits are: 1. It increases the dissolved oxygen in the water body and improves the survival rate of fry hatching. 2. It drives the water flow rate near the air bag 1 through aeration to prevent impurities or excrement in the water from accumulating on the filter net to form a mud layer, thereby clogging the mesh. 3. Increasing the water flow rate near the filter net can increase the speed of water passing through the filter net, that is, increase the filtration efficiency.

[0034] Filter composition: like Figure 3 As shown, the filter screen has a filtering function mainly composed of the upper filter part 23 and the lower filter part 20. For example, the upper filter part 23 can be designed to have a larger mesh size to filter debris or foreign matter with a larger diameter. The lower filter part 20 can be designed to have a smaller mesh size to filter the excrement or dust of fry. The dirt collection part 21 is detachable, and the lower filter part is embedded in the upper end of the dirt collection part 21. The connection between the filter screen body and the dirt collection part 21 can be plug-in or threaded.

[0035] like Figure 3-Figure 7 As shown, the aeration and anti-agglomeration mechanism also includes a pressure assembly, which includes a pressure rod 11, an inner fixed ring 4, an outer fixed ring 3 and an upper scraper 13; the upper ends of the inner fixed ring 4 and the outer fixed ring 3 are both provided with a sliding groove adapted to the sliding of the pressure rod 11, one end of the pressure rod 11 is in contact with the bottom side end of the airbag 1, and the other end is fixed to the upper scraper 13, and the lower end of the upper scraper 13 is in contact with the upper filter 23. A limiting groove is provided on the groove wall of the sliding groove, and correspondingly, a limiting convex rib 12 is provided on the side end of the pressure rod 11. A scraping rubber strip 14 is provided at the lower end of the upper scraper 13.

[0036] Working principle of pressure supply assembly: like Figure 5 As shown, when the pressure rod 11 moves on the outer fixing ring 3 and the inner fixing ring 4, the upper scraper 13 connected thereto will scrape away the dirt on the upper filter portion 23. At the same time, the end of the pressure rod 11 will squeeze the bottom side of the airbag 1, thereby accelerating the release of the internal gas.

[0037] like Figure 6-Figure 7 As shown, the aeration and anti-agglomeration mechanism also includes a dirt scraping assembly, which includes a driving wheel 15, a slide rail rod 7, a sliding rod 6, an arc-shaped scraper 5 and a rotating driving motor; the rotating driving motor is installed at the bottom end of the sedimentation filter tank 25, and the output end of the rotating driving motor is fixed to the driving wheel 15; the sliding rod 6 is provided with a guide protrusion 17, and correspondingly, the driving wheel 15 is provided with an arc-shaped groove 16 adapted to the sliding of the guide protrusion 17, the sliding rod 6 can slide on the slide rail rod 7, the free end of the sliding rod 6 is fixed to the arc-shaped scraper 5, and the lower end of the arc-shaped scraper 5 is in contact with the lower filter part 20.

[0038] The working principle of the dirt scraper assembly is: During the rotation of the driving wheel 15, due to the sliding cooperation between the guide protrusion 17 and the arc groove 16, the sliding rod 6 can be driven to slide on the slide rail rod 7, thereby driving the arc scraper 5 to slide on the lower filter part 20, thereby scraping off the excrement or sludge attached to the upper end of the lower filter part.

[0039] like Figure 5-Figure 7 As shown, the aeration and anti-agglomeration mechanism also includes a linkage rotation component, which includes: a lower transmission wheel 8, a synchronous rotation rod 9, an upper transmission wheel 10, a driving auxiliary wheel 19, a rotating wheel 18 and a support rod 30; the lower transmission wheel 8 and the synchronous rotation rod 9 are synchronously transmitted and connected via the synchronous rotation rod 9, and the lower transmission wheel 8 and the driving wheel 15 are meshingly transmitted and connected; one end of the support rod 30 is fixed to the driving wheel 15, and the other end is rotationally connected to the driving auxiliary wheel 19, the upper transmission wheel 10 and the driving auxiliary wheel 19 are meshingly transmitted and connected, and the rotating wheel 18 and the driving auxiliary wheel 19 are meshingly transmitted and connected; the side end of the pressure rod 11 is provided with a transmission tooth portion, and the rotating wheel 18 and the pressure rod 11 are meshingly transmitted and connected.

[0040] Working principle of linkage rotating assembly: The linkage rotating assembly mainly serves the purpose of transmission. The power of the driving wheel 15 can be transmitted to the upper driving wheel 10 through the lower driving wheel 8, and then transmitted to the rotating wheel 18 through the driving auxiliary wheel 19, thereby driving the pressure rod 11 to slide along the slide groove. Figure 3-Figure 7 In the figure, each pressure rod 11 is correspondingly configured with a rotating wheel. In order to highlight the key structure when showing the drawings, only one place is drawn for illustration.

[0041] In specific applications, the purpose of designing the linkage rotating component is to control the upper scraper 13 and the arc scraper 5 to not slide synchronously. The staggered directions of scraping off dirt can be more conducive to the water flow from the upper filter part 23 to the lower filter part 20, thereby filtering out excrement and impurities.

[0042] In this embodiment, a cover 28 is detachably provided at the upper end of the sedimentation and filtration pool 25, and the incubation pool 29 is connected to a plurality of water outlet pipes, which are correspondingly connected to the lower end of the incubation tank. Example 2

[0043] A method for hatching black carp, the technology comprises the following steps: S01. Parent collection and cultivation In Zhenwang Village, Zhenwang Township, Qingtian County, Lishui City, wild mackerel species were collected from the Oujiang River Basin by netting, and after being isolated and temporarily raised, they were placed in parent breeding pools for intensive breeding. According to the mackerel germplasm standards, larger individuals with no injuries, disabilities, or deformities were selected as parents. Generally, female fish weights are required to be above 45g, and male fish weights are required to be above 60g. The selection rate is determined according to the number of parents, and is generally controlled at 20% to 30%.

[0044] S02, Induction of labor The best time for induced spawning is from early May to mid-July, with water temperature of 21℃~30℃. Select large, strong, uninjured broodstock with well-developed gonads, and pair them up at a ratio of 1:(1~1.5. The head and body of male fish feel rough to the touch, and the abdomen is not swollen. Milky white semen flows out when the abdomen is pressed lightly, and it disperses when it enters the water. The head and body of female fish are smooth, the abdomen is swollen and soft, the ovaries on both sides are clearly outlined, and the genital opening is slightly red. Female fish are injected with chorionic gonadotropin (HCG1000 IU~2000 IU) and luteinizing hormone-releasing hormone No. 2 (LRH-A25µg~10µg per kilogram of body weight. The dose for male fish is halved. The thoracic injection method is used, and the injection site is preferably the base of the pectoral fin, and the injection is a one-time injection.

[0045] S03, Spawning After the injection of oxytocin, 40 to 50 groups of broodstock are placed in each hatching loop, and the hatching bucket is covered with a net to keep it flushed to avoid human interference. 5 to 10 hours after estrus and spawning, the broodstock are caught in time, the fertilized eggs are brushed off and collected, and then put back into the hatching bucket with water for hatching.

[0046] S04, Incubation Hatching is done in a hatching bucket, and the hatching water flow rate is set so that the eggs do not settle. The hatching bucket has 3×105 grains / m3 to 5×105 grains / m3, and the fertilized eggs hatch after 24 h to 36 h. 2 to 3 days after the fry emerge from the membrane, when the swim bladder (waist point) is formed and the fry can swim horizontally in the water, they can be brought out with water and enter the seedling cultivation stage.

[0047] S05, Summer flower fish breeding 10-15 days before stocking, use 75-150kg / mu of quicklime to disinfect the dry pond. 2-3 days after disinfection, inject 40-50 cm of new water filtered through a 60-80 mesh silk sieve, apply 300-400 kg of fermented organic fertilizer per mu, and pile it around the pond where the water is flooded. The use of fertilizers should comply with the provisions of NY / T 394. The stocked water splash fish fry require transparent bodies, bright colors, and not black; strong ability to swim in groups and against the current; deformity rate and injury rate are less than 1%. The stocking density is 100,000 to 200,000 per mu. When the average total length of the fry reaches more than 2.5 cm, they can be taken out of the pond and enter the fish seed cultivation stage.

[0048] S06. Cultivation of carp seeds When the fry grow to 3cm, they are fed with micro-particle floating pellet feed with protein content greater than 42%. During the whole cultivation process, new water is added every 2-3 days, about 15cm each time. In the later stage of cultivation, the water is changed once a week, and one-fifth of the pond water is changed each time. The net is pulled to exercise and measure the fry. Most of them have grown to 4cm, and the fry are divided into ponds for large-scale cultivation.

[0049] The key to the above method is: Parent selection. The goal of parent selection is "pure, high-yield, and healthy". The parent of the mackerel used for breeding is required to be strong, beautiful and complete, disease-free, and aged between 1 and 3 years old. The weight of female fish is 30g to 120g, and the weight of male fish is 50g to 150g.

[0050] Artificial breeding technology: artificial injection of HCG + LRH-A2 mixed hormone to induce labor, artificial dry insemination, and hatching in a hatching bucket. Example 3

[0051] This embodiment provides more application data for the croaker hatching device by further elaboration, specifically: The overall structure of the mackerel hatching device is shown in Figure 2 ,like Figure 2 As shown, the sedimentation and filtration tank 25 is connected to the hatching tank 29, that is, the aquaculture water source is purified by the sedimentation and filtration tank 25 and then flows back to the hatching tank 29. Figure 2 What is shown in the figure is a scene in which the sedimentation and filtration tank 25 is connected to the hatching tank, and the user can make an appropriate selection according to actual needs.

[0052] In the device of the present invention, the pressure supply component can be composed of Figure 3 and Figure 4 As for the key invention point: the specific structure of the dirt scraping assembly, since it is designed below the pressure supply assembly, it is shown through a physical diagram, as follows: Figure 8 The state shown is the state after the sliding rod 6 slides out from the slide rail rod 7. In this state, the dirt on the lower filter part 20 can be scraped off.

[0053] When the sliding rod 6 slides into the slide rail rod 7 and the arc scraper is in a retracted state, the dirt on the lower filter portion 20 can be scraped off by the arc scraper 5 moving back and forth.

Claims

1. A method for hatching a carp, characterized in that: The steps include: S01. Inducing labor Select large, strong, uninjured broodstock with well-developed gonads, and pair them up in a female-to-male ratio of 1:1 to 1.5; Using the intrathoracic injection method, female fish were injected with 1000 IU to 2000 IU of human chorionic gonadotropin and 5µg to 10µg of luteinizing hormone-releasing hormone No. 2 per kilogram of body weight at the base of the pectoral fin. The dose for male fish was halved, and an oxytocin was injected once. S02, Spawning After the injection of oxytocin, 40 to 50 groups of broodstock are placed in each hatching loop. 5 to 10 hours after estrus and spawning, the broodstock are caught, the fertilized eggs are brushed off and collected, and then re-hatched with water; S03, Incubation The incubation bucket is 3×105 / m3~5×105 / m3, and the fertilized eggs will hatch out of the membrane after 24h~36h; 2 to 3 days after the fry emerge from the membrane, when the swim bladder is formed and they can swim horizontally in the water, they can emerge from the water and enter the fry cultivation stage.

2. The method for hatching a carp according to claim 1, characterized in that: The following steps are also included: Summer flower fish breeding: 10-15 days before stocking, disinfect the pond with 75-150 kg / mu of quicklime; 2-3 days after disinfection, inject 40-50 cm of fresh water filtered through a 60-80 mesh silk sieve, apply 300-400 kg of fermented organic fertilizer per mu, and pile it around the pond in the submerged area; When the average length of the fry reaches more than 2.5 cm, they can be taken out of the pond and enter the fish seed cultivation stage; Cultivation of mackerel species: When the fry grow to 3cm, they are acclimated and fed with micro-particle floating pellet feed with protein content greater than 42%; During the entire breeding process, new water is added every 2 to 3 days, 15 cm each time. In the later stage of breeding, the water is changed every 7 days, one-fifth of the pond water is changed each time. The net is pulled to exercise and measure the fry. When the fry grow to 4 cm, the fry are divided into ponds for large-scale breeding.

3. A method for hatching black carp according to claim 2, characterized in that: In step S04, the stocking density of fry is 100,000 to 200,000 fry per mu.

4. A device for hatching black carp using any of the methods described in claims 1 to 3, characterized in that: It comprises an incubation pool (29) and a sedimentation and filtration pool (25), wherein the incubation pool (29) and the sedimentation and filtration pool (25) are connected; The sedimentation and filtration tank (25) comprises a filter screen (27) and an aeration and anti-sedimentation mechanism; The aeration and anti-agglomeration mechanism comprises a vent pipe (24) and an air bag (1), the vent pipe (24) and the air bag (1) are in communication, the air bag (1) is arranged above the filter screen (27), and an air outlet (2) is provided at a side end of the air bag (1); The filter screen (27) comprises a fixed extension portion (22), an upper filter portion (23), a lower filter portion (20) and a dirt collection portion (21); a fixed ring (26) is provided at a side end of the sedimentation filter tank (25); the fixed extension portion (22) is fixedly placed above the fixed ring (26); the lower filter portion (20) and the dirt collection portion (21) are plugged and fixed; and the filter screen body is screwed to the dirt collection portion (21).

5. The device for hatching black carp according to claim 4, characterized in that: The aeration and anti-agglomeration mechanism also includes a pressure-supplying assembly, which includes a pressure-supplying rod (11), an inner fixing ring (4), an outer fixing ring (3), and an upper scraper (13); The upper ends of the inner fixing ring (4) and the outer fixing ring (3) are respectively provided with sliding grooves adapted for sliding the pressure rod (11); one end of the pressure rod (11) contacts the bottom side of the airbag (1), and the other end is fixed to the upper scraper (13); the lower end of the upper scraper (13) contacts the upper filter portion (23).

6. The device for hatching black carp according to claim 5, characterized in that: A limiting groove is provided on the groove wall of the slide groove, and correspondingly, a limiting convex rib (12) is provided on the side end of the pressure rod (11).

7. The device for hatching black carp according to claim 5, characterized in that: A rubber scraping strip (14) is provided at the lower end of the upper scraper (13).

8. The device for hatching black carp according to claim 5, characterized in that: The aeration and anti-agglomeration mechanism also includes a dirt scraping assembly, which includes a driving wheel (15), a slide rail rod (7), a sliding rod (6), an arc-shaped scraper (5), and a rotating driving motor; The rotary drive motor is installed at the bottom end of the sedimentation and filtration tank (25), and the output end of the rotary drive motor is fixed to the drive wheel (15); The sliding rod (6) is provided with a guide protrusion (17), and correspondingly, the driving wheel (15) is provided with an arc groove (16) adapted to slide the guide protrusion (17). The sliding rod (6) can slide on the slide rail rod (7), the free end of the sliding rod (6) is fixed to the arc scraper (5), and the lower end of the arc scraper (5) is in contact with the lower filter part (20).

9. The device for hatching black carp according to claim 8, characterized in that: The aeration and anti-agglomeration mechanism further includes a linkage rotation component, and the linkage rotation component includes: A lower transmission wheel (8), a synchronous rotating rod (9), an upper transmission wheel (10), a driving auxiliary wheel (19), a rotating wheel (18), and a support rod (30); The lower transmission wheel (8) and the synchronous rotating rod (9) are synchronously connected in transmission via the synchronous rotating rod (9), and the lower transmission wheel (8) and the driving wheel (15) are meshingly connected in transmission; One end of the support rod (30) is fixed to the driving wheel (15), and the other end is rotatably connected to the driving auxiliary wheel (19); the upper transmission wheel (10) and the driving auxiliary wheel (19) are meshingly connected to each other for transmission; and the rotating wheel (18) and the driving auxiliary wheel (19) are meshingly connected to each other for transmission; A transmission tooth portion is provided at the side end of the pressure rod (11), and the rotating wheel (18) and the pressure rod (11) are meshed and transmission-connected.

10. The device for hatching black carp as claimed in claim 4, characterized in that: The upper end of the sedimentation and filtration pool (25) is detachably provided with a cover body (28), and the incubation pool (29) is connected to a plurality of water outlet pipes, and the water outlet pipes are correspondingly connected to the lower end of the incubation tank.

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