Artificial breeding and hatching device and method for seriola aureovittata

Abstract

The invention relates to the field of aquatic economic animal breeding and proliferation and culture research, in particular to a seriola aureovittata artificial breeding and hatching device and method.The device comprises a frame and a base arranged at the bottom of the frame, a first supporting ring is arranged on the upper portion of the frame, an inner barrel is rotationally connected into the first supporting ring, and a plurality of through holes are formed in the side wall of the inner barrel; a filter screen is arranged in each through hole; an oxygen supply assembly which is fixedly connected to the frame and extends into the inner barrel to supply oxygen to the inner barrel is arranged at the top of the base; a second supporting ring is arranged in the middle of the frame, and an outer barrel located below the first supporting ring is rotationally connected into the second supporting ring. By arranging the inner and outer double-barrel structure, the mechanical transmission driving system and the synchronous oxygen supply circulating mechanism, while roe suspension incubation is achieved, dynamic balance of the water flow speed, the flow direction and dissolved oxygen distribution in the incubation water body is guaranteed, and therefore the incubation rate of the seriola aureovittata fertilized ova and the survival rate of fry are remarkably increased.

Description

Technical Field

[0001] This invention relates to the field of aquatic economic animal breeding and aquaculture research, specifically to an artificial breeding and incubation device and method for high-bodied yellowtail. Background Technology

[0002] The high-bodied amberjack (Seriola dumerili), also known as the red amberjack or red croaker, belongs to the family Seriolaidae in the order Caryotauriformes and the genus Seriola. It is a marine aquaculture fish with high economic value. This fish grows quickly, has delicate flesh, high protein content, strong adaptability, and good disease resistance. In recent years, it has become a key species for development in deep-sea cage culture and factory-scale seedling production systems.

[0003] In the artificial breeding of Amberjack, after sexually mature broodstock are induced to spawn or release sperm naturally, their fertilized eggs are transparent, spherical, and buoyant, generally about 1.06 mm in diameter. The egg membrane is thin and smooth, containing a distinct oil globule. The presence of this oil globule allows the fertilized eggs to naturally suspend in the upper and middle water layers of seawater with suitable salinity (usually 30–34‰). The eggs rely primarily on water flow for oxygen exchange and spatial distribution; therefore, their hatching survival rate is extremely sensitive to water flow velocity, dissolved oxygen concentration, and water quality stability. Studies have shown that when the water flow velocity is too high, the eggs are easily broken due to collisions; while when the flow velocity is too low or stagnant areas form, the eggs will sink, accumulate, and die from oxygen deprivation, significantly reducing the hatching rate.

[0004] Currently, both domestically and internationally, recirculating water or micro-flow water incubation systems are commonly used for the artificial incubation of amberjack eggs. Taking the commonly used "fish tank" incubation tank as an example, its structure typically includes an inner tank and an outer tank. The inner tank is used for egg incubation, with several through-holes with filters on its side walls, connecting it to the water in the outer tank. A motor is installed on the outer wall of the outer tank, connected to an external water supply system, and directional water intake is achieved through several outlet pipes located at the top of the inner tank. During use, the operator places the selected eggs into the inner tank, and the motor in the outer tank drives water to spray from top to bottom into the inner tank, creating a rotating circulation within the tank. This keeps the eggs in a relatively uniform suspension state, thereby promoting stable development of the fertilized eggs in oxygenated water. However, although this device can maintain the dispersion of fish eggs and reduce mechanical damage to some extent, it still has the following limitations in the artificial incubation of high-body amberjack: insufficient flow field stability. Due to the directional setting of the water pipe outlet, the water flow is faster near the outlet in the inner tank, while the water flow is slower or stagnant further away from the outlet, which easily forms local eddies or still water zones, resulting in limited oxygen exchange efficiency. When the hatching density is high, the dissolved oxygen in the local water decreases, and the oxygen concentration gradient on the surface of the fish eggs increases, affecting embryonic metabolism and normal development. Therefore, it is necessary to propose an artificial breeding and incubation device and method for high-body amberjack to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an artificial breeding and hatching device for amberjack. By incorporating an inner and outer double-barrel structure, a mechanical transmission drive system, and a synchronous oxygen supply and circulation mechanism, the device achieves suspended hatching of fish eggs while maintaining a dynamic balance in the water flow velocity, direction, and dissolved oxygen distribution within the hatching water, thereby significantly improving the hatching rate of amberjack fertilized eggs and the survival rate of fry.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: an artificial breeding and incubation device for amberjack includes a frame and a base located at the bottom of the frame. A first support ring is provided on the upper part of the frame, and an inner barrel is rotatably connected inside the first support ring. The side wall of the inner barrel is provided with several through holes, and each through hole is provided with a filter screen. An oxygen supply component is provided on the top of the base, which is fixedly connected to the frame and extends into the inner barrel to supply oxygen to the inner barrel. A second support ring is provided in the middle of the frame. An outer barrel located below the first support ring is rotatably connected inside the second support ring. The outer barrel is fitted over the inner barrel. A sleeve is provided on the bottom wall of the outer barrel. A second bevel gear is fixedly connected to the outer wall of the sleeve away from the outer barrel via a shaft. The second bevel gear meshes with a transmission gear. A first bevel gear meshes with the other side of the transmission gear, and the first bevel gear is located directly below the second bevel gear. A rotating shaft is fixedly connected to the first bevel gear on the same axis. The end of the rotating shaft near the first bevel gear is rotatably connected to the base. The other end of the rotating shaft extends into the outer barrel and is fixedly connected to the bottom wall of the inner barrel. The sleeve is fitted over the rotating shaft. A transmission shaft is fixedly connected to the transmission gear on the same axis. The other end of the transmission shaft extends into the oxygen supply component and is fixedly connected to several blades.

[0007] The technical principle of the above scheme is as follows: During oxygen-assisted incubation of fertilized eggs of the amberjack in the inner barrel, the oxygen supply component continuously inputs oxygen-enriched gas into the device. The oxygen flows through the paddles, driving them to rotate. The rotation of the paddles drives the transmission shaft, which is fixed coaxially with them, to rotate synchronously. The transmission shaft further drives the transmission gear meshing with it to rotate. During the rotation of the transmission gear, it simultaneously drives the first bevel gear and the second bevel gear to rotate in opposite directions, causing the inner barrel connected to the first bevel gear and the outer barrel connected to the second bevel gear to rotate in opposite directions.

[0008] During this process, the rotation of the inner bucket causes the water inside to flow in a ring, while the counter-rotation of the outer bucket creates a stable shear flow field between it and the inner bucket. The combined effect of these two factors establishes a relatively uniform three-dimensional flow field within the bucket, resulting in a smoother distribution of water velocity in both the radial and axial directions. This avoids mechanical damage to the fish eggs caused by excessively high local velocities and reduces the formation of stagnant zones, thereby improving the uniformity of fish egg suspension and oxygen exchange efficiency.

[0009] Furthermore, the inner tank has several through-holes with filter screens on its side wall. As the outer tank rotates, water continuously flows through the filter screen into the inner tank, maintaining clean water and sufficient dissolved oxygen while effectively preventing fish eggs from leaking out with the water flow. During operation, the oxygen supply component provides a continuous oxygen source, and the transmission system coordinates power transmission with the counter-rotating of the two tanks, ensuring uniform hatching of the fish eggs in a stable swirling environment, thereby improving the hatching rate and fry survival rate.

[0010] The above approach has the following beneficial effects: 1. This solution, through the coordinated operation of the inner and outer double-bucket structure and the mechanical transmission rotation system, enables the incubation water to form a continuous and stable circulation motion between the inner and outer buckets. This avoids the problems of local high-speed zones and stagnant zones caused by the fixed position of the nozzle in existing incubation buckets, thereby significantly improving the suspension stability and oxygen exchange efficiency of fish eggs, and effectively reducing mechanical damage and hypoxia death caused by collisions or settling of fish eggs.

[0011] 2. In this design, the airflow rate of the oxygen supply component and the rotation speed of the inner and outer tanks are dynamically linked. Adjusting the oxygen flow rate not only controls the paddle rotation speed but also indirectly affects the rotational intensity and circulation speed of the inner and outer tanks. By adjusting the oxygen supply pressure, the hatching flow field can be adaptively controlled, matching the water flow velocity with the fish egg density. This maintains ideal dissolved oxygen levels and hydrodynamic environment at different hatching stages, improving the survival rate of fertilized eggs and the hatching success rate.

[0012] 3. This solution uses mechanical transmission and passive circulation as the core drive method, eliminating the complex electronic control and independent water pump module of traditional systems. This design is not only simple in structure and stable and reliable, but also effectively reduces manufacturing and maintenance costs. At the same time, since the power transmission link is enclosed inside the device, it can avoid motor and wiring failures caused by humid environments, thereby improving the overall operational safety and long-term service life of the system.

[0013] Furthermore, the oxygen supply assembly includes an air pump fixedly connected to the top of the base. The air pump inlet is connected to an external oxygen supply device, the air pump outlet is connected to a gas collection pipe, the gas collection pipe is connected to a chamber, and the side of the chamber away from the gas collection pipe is connected to an oxygen delivery pipe. The other end of the oxygen delivery pipe extends to the bottom of the inner barrel. The inner diameter of the air pump outlet is larger than the inner diameter of the gas collection pipe. The drive shaft extends into the chamber.

[0014] Beneficial effects: This design utilizes an air pump to continuously supply oxygen while simultaneously creating a pressure pulse zone through the gas collection pipe and chamber structure. This enhances the impact kinetic energy of the gas, generating efficient turbulence within the chamber that drives the drive shaft and paddles to rotate, thus achieving the dual function of oxygen supply and water agitation. This structure requires no independent power system, boasts high energy efficiency, and ensures more thorough gas-liquid mixing, thereby improving dissolved oxygen rate and hatching efficiency.

[0015] Furthermore, the top of the frame is equipped with several lighting lamps located above the inner barrel.

[0016] Beneficial effects: The light lamp can simulate the natural day and night light environment, promote the normal development of fish eggs and embryos and endocrine regulation, and at the same time facilitate the operator to observe and manage at night or when there is insufficient light, thereby improving the controllability and safety of seedling cultivation.

[0017] Furthermore, the top of the frame is equipped with ultraviolet lamp columns that extend between the inner and outer cylinders, and the ultraviolet lamp columns are staggered from the filter screen.

[0018] Beneficial effects: Regularly turning on the ultraviolet lamp can periodically disinfect the water in the inner and outer tanks, inhibiting the growth of bacteria, fungi, and algae, reducing pathogenic microbial contamination, ensuring a clean and stable growth environment for high-bodied yellowtail fry, thereby reducing the infection rate of pathogens on newly hatched fry and significantly improving the survival rate of fry. At the same time, because the ultraviolet lamp is located between the inner and outer tanks and is misaligned with the filter screen, the ultraviolet light will not irradiate the high-bodied yellowtail eggs and cause them damage.

[0019] Furthermore, several flow-blocking blocks are provided on both the outer wall of the inner barrel and the inner wall of the outer barrel.

[0020] Beneficial effects: The flow-blocking block can break the unidirectionality of the circulation layer during the relative rotation of the inner and outer barrels, making the water flow form multidirectional micro-vortices and enhancing the overall mixing effect of the water body; at the same time, it can buffer the radial shear force generated by rotation and prevent the fish eggs from being mechanically damaged by excessively fast local water flow.

[0021] Furthermore, a controller is located at the top of the frame, and the controller is electrically connected to a thermometer that extends into the inner barrel.

[0022] Beneficial effects: This design can monitor the temperature changes of the incubation water in real time, providing accurate data support for incubation management and avoiding the impact of environmental parameter fluctuations on the development of fertilized eggs; at the same time, it is easy to connect to an automated control system to achieve precise seedling management.

[0023] Furthermore, the gas supply pipe has several branch pipes at one end inside the inner barrel.

[0024] Beneficial effects: The gas distribution structure allows oxygen to be distributed more evenly at the bottom of the inner tank, forming multiple aeration zones, thereby establishing a balanced gas-liquid flow environment inside the tank, avoiding the problem of uneven oxygen supply from a single gas outlet, and improving the overall dissolved oxygen efficiency.

[0025] Furthermore, a sealing ring is provided at the contact point between the rotating shaft and the outer barrel, and a protective shell is provided on the top of the base. The first bevel gear, the second bevel gear, and the transmission gear are all located inside the protective shell.

[0026] Beneficial effects: The sealing ring can effectively prevent water leakage and wear between rotating parts, improve the waterproof sealing performance and mechanical life of the device, and ensure long-term stable operation.

[0027] Furthermore, each gas distribution pipe opening is equipped with a dividing mesh.

[0028] Beneficial effects: The splitting net can divert the oxygen output from the gas distribution pipe, making it into a finer airflow. The smaller the airflow bubbles, the larger the contact surface area with water, and the slower the rising speed in water, thereby increasing the contact time and contact area between oxygen and water, and thus increasing the proportion of oxygen dissolved in water.

[0029] Furthermore, a method for artificial breeding and hatching of high-bodied amberjack includes the following steps: Step 1, Inducing spawning in high-bodied yellowtail: Select healthy and sexually mature female and male high-bodied yellowtail, and induce spawning artificially so that the female releases her eggs into the water, and the male fertilizes the eggs naturally. The fertilized eggs are then collected and preserved in a container. Step 2, screening of fertilized eggs: Let the container stand for a period of time to allow bad eggs to settle, and then use a tool to remove the bad eggs; Step 3, Hatching of Fertilized Eggs: Pour the selected fertilized eggs into the inner tank filled with seawater and turn on the air pump to deliver oxygen from the external oxygen supply equipment to the seawater through the air pipe; at the same time, the gas in the air pipe drives the paddle to rotate, which in turn drives the drive shaft and drive gear to rotate the inner and outer tanks in opposite directions, disturbing the seawater in the inner and outer tanks, so that the seawater and oxygen dissolve, ensuring that the high-bodied yellowtail eggs can obtain enough oxygen during hatching, and thus hatch successfully; Step 4, seawater replacement: Use an external pump to periodically extract and discharge the seawater in the inner and outer tanks, while simultaneously injecting new seawater to provide a suitable growth environment for the high-bodied yellowtail larvae.

[0030] The beneficial effects of the basic scheme are as follows: The artificial breeding and hatching method for amberjack provided by this invention utilizes an air pump for oxygen supply and mechanical transmission to form a composite water flow during the hatching stage, achieving suspended hatching of fish eggs in a uniform flow field, effectively reducing fish egg mortality caused by local hypoxia, stagnation, or collisions. This method is simple to operate, reusable, and significantly improves hatching uniformity, embryonic development integrity, and overall survival rate.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] Figure 1 This is a partial cross-sectional view of an embodiment of the artificial breeding and incubation device for amberjack of the present invention; Figure 2This is a cross-sectional view of the inner and outer barrels of an embodiment of the artificial breeding and incubation device for amberjack of the present invention; Figure 3 This is an isometric view of the inner barrel of an embodiment of the artificial breeding and incubation device for high-bodied amberjack of the present invention; Figure 4 This is a schematic diagram of the artificial breeding and hatching method for high-bodied yellowtail of the present invention.

[0033] The reference numerals in the accompanying drawings of the instruction manual include: 1. Frame; 2. Base; 3. First support ring; 4. Inner barrel; 5. Through hole; 6. Filter screen; 7. Second support ring; 8. Outer barrel; 9. Sleeve; 10. Second bevel gear; 11. Transmission gear; 12. First bevel gear; 13. Rotating shaft; 14. Transmission shaft; 15. Paddle; 16. Air pump; 17. Oxygen supply pipe; 18. Gas collection pipe; 19. Chamber; 20. Illuminator; 21. Ultraviolet lamp column; 22. Flow baffle; 23. Thermometer; 25. Gas distribution pipe; 26. Protective shell; 27. Dividing mesh; 28. Controller. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The following detailed description illustrates the specific implementation method: An artificial breeding and incubation device for high-bodied yellowtail, see attached document. Figure 1 and attached Figure 2 As shown, it includes a frame 1 and a base 2 detachably connected to the bottom of the frame 1; a first support ring 3 is welded to the upper part of the frame 1, and an inner tub 4 is rotatably connected inside the first support ring 3. Several through holes 5 are opened on the side wall of the inner tub 4. (Refer to the attached diagram.) Figure 3 As shown, each through-hole 5 is fitted with a filter screen 6 to prevent fish eggs or impurities from flowing out with the water. To meet the fish eggs' needs for light and environmental monitoring, several light lamps 20 are threadedly connected to the top of the frame 1 above the inner tank 4. In addition, a controller 28 can be detachably connected to the top of the frame 1. The preferred model of the controller 28 is 6SL3210-1KE15-8AP2. The controller 28 is electrically connected to a thermometer 23 extending into the inner tank 4 to monitor the temperature changes of the incubation water in real time and ensure the stability of the fish egg growth environment.

[0038] The top of the base 2 is threadedly connected to an oxygen supply component that extends into the inner barrel 4 and provides a stable oxygen supply to the inner barrel 4. The oxygen supply component includes an air pump 16 that is threadedly connected to the top of the base 2. The air pump 16 has an air inlet connected to an external oxygen supply device and an air outlet connected to a gas collecting pipe 18. The other end of the gas collecting pipe 18 is connected to a chamber 19. The side of the chamber 19 away from the gas collecting pipe 18 is connected to an oxygen delivery pipe 17. The other end of the oxygen delivery pipe 17 extends to the bottom of the inner barrel 4 and is connected to several gas distribution pipes 25. Each gas distribution pipe 25 has a dividing mesh 27 welded to its opening, and the inner diameter of the air pump 16 outlet is larger than the inner diameter of the gas collecting pipe 18. A second support ring 7 is welded to the middle of the frame 1. An outer barrel 8 located below the first support ring 3 is rotatably connected inside the second support ring 7. The outer barrel 8 is fitted outside the inner barrel 4. In order to enhance the stability of the water flow and reduce the occurrence of eddies and stagnant areas, several flow-blocking blocks 22 are provided on the outer wall of the inner barrel 4 and the inner wall of the outer barrel 8 to reasonably disperse and guide the water flow. In addition, an ultraviolet lamp column 21 extending between the inner barrel 4 and the outer barrel 8 can be detachably connected to the top of the frame 1. The ultraviolet lamp column 21 is staggered from the filter screen 6 to avoid direct ultraviolet radiation on the eggs of the high-bodied amberjack and damage to the eggs. The ultraviolet lamp column 21 is used to inhibit the growth of microorganisms in the water in the inner barrel 4 and the outer barrel 8, keep the water quality clean, and reduce the probability of pathogens infecting the larvae of the high-bodied amberjack. A sleeve 9 is welded to the bottom wall of the outer barrel 8. A second bevel gear 10 is fitted onto the outer wall of the sleeve 9 away from the outer barrel 8. The second bevel gear 10 meshes with a transmission gear 11. A first bevel gear 12 meshes with the other side of the transmission gear 11, and the first bevel gear 12 is located directly below the second bevel gear 10. A rotating shaft 13 is coaxially keyed to the first bevel gear 12. One end of the rotating shaft 13 near the first bevel gear 12 is rotatably connected to the base 2, and the other end passes through the sleeve 9 and extends into the interior of the outer barrel 8 and is welded to the outer bottom wall of the inner barrel 4. The sleeve 9 is fitted onto the outside of the rotating shaft 13 to ensure transmission stability. A transmission shaft 14 is coaxially keyed to the transmission gear 11. The other end of the transmission shaft 14 extends into the interior of the chamber 19 and is welded with several blades 15.

[0039] The specific implementation process is as follows: Before using this device to incubate the fertilized eggs of the amberjack, the device is first placed stably on a horizontal platform, and the stability of the overall structure is ensured by the detachable connection between the base 2 and the frame 1. Then, seawater with a salinity suitable for the incubation of the amberjack eggs is injected into the inner tank 4. The selected amberjack eggs are then placed into the inner tank 4, and the external oxygen supply equipment is turned on. The air pump 16 starts working, drawing air or pure oxygen into the air inlet of the air pump 16, which then enters the inner tank 4 through the oxygen delivery pipe 17. The oxygen is then evenly released to the bottom of the inner tank 4 through multiple air distribution pipes 25, forming an airflow that is vertically upward from the bottom of the inner tank 4, thus fully mixing the oxygen into the water. Each air distribution pipe 25 has a dividing mesh 27 at its opening. The dividing mesh 27 can divert the oxygen output from the air distribution pipe 25, making it into smaller bubbles, thus increasing the contact surface area between the oxygen and the water, thereby increasing the contact time and contact area between the oxygen and the water, and ultimately increasing the proportion of oxygen dissolved in the water. At the same time, when oxygen enters the smaller diameter gas collecting pipe 18 through the outlet of the gas pump 16, the gas flow rate and pressure increase due to the reduced pipe diameter, thereby driving the drive shaft 14 and the blades 15 on it in the chamber 19 to rotate.

[0040] The power generated by the rotation of the paddle 15 is transmitted to the drive shaft 14, which in turn drives the drive gear 11. The drive gear 11 meshes with the first bevel gear 12, driving the rotating shaft 13 to rotate, which in turn drives the inner barrel 4 to rotate. Simultaneously, the drive gear 11 meshes with the second bevel gear 10, driving the outer barrel 8 to rotate, thus achieving relative counter-rotation between the inner barrel 4 and the outer barrel 8. Specifically, when one side of the drive gear 11 drives the inner barrel 4 to rotate clockwise, the other side of the drive gear 11 drives the outer barrel 8 to rotate counter-clockwise, thereby forming a stable and uniform circulation between the inner barrel 4 and the outer barrel 8. This circulation not only ensures that the high-bodied yellowtail eggs remain suspended in the water within the entire inner barrel 4, preventing them from sinking and accumulating, but also effectively avoids the generation of local high-speed flows or stagnant zones, ensuring that oxygen is evenly distributed in both horizontal and vertical directions, guaranteeing a stable and sufficient oxygen supply to the eggs, thereby ensuring embryonic metabolism and normal development.

[0041] During water circulation, the through holes 5 and filter screen 6 on the side wall of the inner barrel 4 effectively prevent fish eggs from being lost with the water flow. The flow-blocking blocks 22 set on the outer wall of the inner barrel 4 and the inner wall of the outer barrel 8 further guide the water flow, reducing the possibility of eddies and stagnant water areas and maintaining a stable and uniform water flow. At the same time, the light lamp 20 at the top of the frame 1 provides constant light, providing light conditions for the growth of fish eggs. The ultraviolet light column 21 located between the inner barrel 4 and the outer barrel 8 emits ultraviolet light that inhibits the growth of microorganisms in the water, maintains water quality, reduces the probability of pathogens infecting high-bodied yellowtail larvae, and improves the survival rate of larvae. The thermometer 23 monitors water parameters in real time and transmits the parameters to the controller 28. The controller 28 processes the parameters and transmits them to the terminal, allowing the operator to adjust the oxygen supply, water temperature, and light intensity in a timely manner based on the monitoring results, ensuring that the hatching environment is always kept in the optimal state.

[0042] Throughout the incubation process, oxygen is continuously released through the oxygen supply pipe 17. The gear system drives the inner barrel 4 and the outer barrel 8 to rotate in opposite directions, forming a continuous and stable circulating water body. This water flow not only effectively avoids the formation of local eddies and still water zones, but also improves the stability of the fish eggs' suspension and the oxygen dissolution efficiency. As the fish eggs gradually hatch, the oxygen supply continuously increases, causing the inner barrel 4 and the outer barrel 8 to rotate faster, making the water flow more disturbed, resulting in higher oxygen and water dissolution efficiency, thus significantly improving the hatching survival rate of high-bodied amberjack eggs. Through the above design and operation, this device can achieve the dual goals of water body disturbance and circulation balance while ensuring uniform suspension and stable oxygen supply for high-bodied amberjack eggs, fully demonstrating its practicality and efficiency in the artificial incubation of high-bodied amberjack eggs.

[0043] The following comparative experiment, based on the device design provided in the above embodiment and the "fish tank" hatching barrel, highlights the advantages of the device provided in this embodiment in hatching high-bodied yellowtail eggs.

[0044] Experimental Objective The performance of the artificial breeding and hatching device for high-body yellowtail (hereinafter referred to as "the device") of the present invention in terms of fish egg suspension stability, dissolved oxygen distribution, hatching rate and survival rate was evaluated, and compared with the "fish tank" hatching bucket commonly used in the market to verify the advantages of the device.

[0045] Experimental materials and equipment High-bodied yellowtail sexually mature breeding fish (female eggs and male sperm) Seawater (salinity: 32‰±1‰, temperature: 23℃±1℃) This device (inner and outer double tanks, mechanical transmission, 15-blade oxygen supply system) Comparison device: Commonly used "fish tank" hatching tanks (single-tank micro-flow system) in the market Water quality monitoring instruments (dissolved oxygen meter, thermometer 23) 20 light lamps and 21 ultraviolet lamp columns Timers and microscopes are used for observing fish egg development. Experimental methods 1. Fish egg preparation After fertilization, the eggs of the high-bodied yellowtail were left to stand for 20 minutes, and then the bad eggs were removed.

[0046] 2. Group settings Experimental group (this device): Volume 165L. Add the screened fish eggs (approximately 300,000) into the inner tank 4 of this device, and turn on the oxygen supply system and mechanical rotation device.

[0047] Control group (fish tank): 165L volume. Add the same number of fish eggs to the inner tank 4 of the control device and turn on the circulating water or micro-flow water system.

[0048] 3. Hatching parameter records Record the dissolved oxygen concentration (mg / L), water flow velocity (cm / s), water temperature and salinity of the water in the inner tank 4 every day.

[0049] Observe the suspension status of fish eggs and the proportion of bad eggs every 12 hours.

[0050] 4. Hatching survival rate determination After the fish eggs have hatched (approximately 48-72 hours), count the number of hatched fry and calculate the hatching rate: Hatching rate (%) = {Number of hatched fry} / {Total number of eggs} x 100 After hatching, continue to observe until the initial swimming stage (approximately 7 days), and calculate the survival rate: Survival rate (%) = {Number of newly hatched fry} / {Number of hatched fry} X 100 Table 1 Experimental data collection Experimental Results and Analysis: Fish egg suspension stability The device exhibits uniform water flow, with only 1% settling to the bottom, significantly lower than the 8% of the fish tank. This demonstrates that the device effectively avoids stagnation and localized sedimentation through the counter-rotation of the inner and outer barrels and mechanical disturbance.

[0051] Dissolved oxygen distribution The average dissolved oxygen level in the water in this device was 7.8 mg / L, compared to 6.5 mg / L in the control group. This demonstrates that the oxygen supply system and circulation structure can significantly improve the uniform distribution of oxygen, meeting the oxygen sensitivity requirements of fish eggs.

[0052] Hatching rate and survival rate The hatching rate of this device was 94%, and the survival rate of the first swimmers was 91%, both significantly better than the hatching rate of 85% and the survival rate of 83% of the fish tank. The results show that this device has significant advantages in ensuring uniform suspension of fish eggs, stable oxygen supply, and reducing mechanical damage.

[0053] Overall conclusion: The internal and external dual-barrel mechanical transmission and the 15-paddle oxygen supply system effectively solve the problems of uneven water flow and insufficient oxygen distribution in single-barrel incubation devices. This device demonstrates higher hatching and survival rates in the artificial incubation of high-bodied yellowtail eggs, significantly improving artificial breeding efficiency and reducing losses, and has strong practical value and promotion potential.

[0054] Example 2: As attached Figure 1 and attached Figure 2 As shown, the difference from Embodiment 1 is that, in order to prevent water from leaking out of the outer tub 8, a sealing ring is provided at the contact point between the rotating shaft 13 and the outer tub 8; in order to prevent the first bevel gear 12, the second bevel gear 10 and the transmission gear 11 from being stuck by foreign objects and unable to operate normally, a protective shell 26 is welded to the top of the base 2, and the first bevel gear 12, the second bevel gear 10 and the transmission gear 11 are all located inside the protective shell 26.

[0055] The specific implementation process is as follows: When the rotating shaft 13 drives the inner barrel 4 and the outer barrel 8 to rotate relative to each other, the sealing ring tightly fits the contact surface between the rotating shaft 13 and the outer barrel 8, effectively preventing water leakage along the gap of the rotating shaft 13, and reducing direct friction between the rotating shaft 13 and the sleeve 9 or the wall of the outer barrel 8, thereby reducing wear and noise. In addition, the presence of the protective shell 26 also extends the service life of the first bevel gear 12, the second bevel gear 10 and the transmission gear 11, reduces the maintenance frequency, provides a reliable guarantee for the long-term stable hatching of high-body yellowtail eggs, and ensures that the device can maintain its optimal working condition even under continuous operation for many days or high hatching density conditions.

[0056] Example 3: As attached Figure 4 As shown, the difference from the above embodiments lies in that the artificial breeding and hatching method for *Amberjack amberjack* includes the following steps: Step 1, Inducing spawning in high-bodied yellowtail: Select healthy and sexually mature female and male high-bodied yellowtail, and induce spawning artificially so that the female releases her eggs into the water, and the male fertilizes the eggs naturally. The fertilized eggs are then collected and preserved in a container. Step 2, screening of fertilized eggs: Let the container stand for a period of time to allow bad eggs to settle, and then use a tool to remove the bad eggs; Step 3, Hatching of Fertilized Eggs: Pour the selected fertilized eggs into the inner tank 4 containing seawater, and turn on the air pump 16 to deliver oxygen provided by the external oxygen supply equipment to the seawater through the air pipe; at the same time, the gas in the air pipe drives the paddle 15 to rotate, which in turn drives the transmission shaft 14 and the transmission gear 11 to drive the inner tank 4 and the outer tank 8 to rotate in opposite directions, disturbing the seawater in the inner tank 4 and the outer tank 8, so that the seawater and oxygen dissolve, ensuring that the high-bodied yellowtail eggs can obtain enough oxygen during hatching, and thus hatch successfully; Step 4, Seawater Replacement: The seawater in the inner tank 4 and outer tank 8 is periodically pumped out and replaced with fresh seawater to provide a suitable growth environment for the high-bodied yellowtail larvae.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high body tuna artificial breeding and hatching device, comprising a frame (1) and a base (2) arranged at the bottom of the frame (1), characterized in that, The frame (1) is provided with a first supporting ring (3) at the upper portion, the first supporting ring (3) is rotatably connected with an inner barrel (4) inside, the side wall of the inner barrel (4) is provided with a plurality of through holes (5), and the through holes (5) are all provided with filter screens (6); the top of the base (2) is provided with an oxygen supply assembly fixedly connected with the frame (1) and extending into the inner barrel (4) to supply oxygen for the inner barrel (4); The frame (1) is provided with a second supporting ring (7) at the middle portion, the second supporting ring (7) is rotatably connected with an outer barrel (8) located below the first supporting ring (3) inside, and the outer barrel (8) is sleeved outside the inner barrel (4); the bottom wall of the outer barrel (8) is provided with a sleeve (9), the outer wall of one end of the sleeve (9) away from the outer barrel (8) is sleeved with a second bevel gear (10), the second bevel gear (10) is meshed with a transmission gear (11), the other side of the transmission gear (11) is meshed with a first bevel gear (12), and the first bevel gear (12) is located directly below the second bevel gear (10); the first bevel gear (12) is coaxially fixedly connected with a rotating shaft (13), one end of the rotating shaft (13) close to the first bevel gear (12) is rotatably connected with the base (2), the other end of the rotating shaft (13) penetrates through the sleeve (9) and extends into the outer barrel and is fixedly connected with the bottom wall of the inner barrel (4), and the sleeve (9) is sleeved outside the rotating shaft (13); the transmission gear (11) is coaxially fixedly connected with a transmission shaft (14), and the other end of the transmission shaft (14) extends into the oxygen supply assembly and is fixedly connected with a plurality of paddles (15).

2. The artificial breeding and hatching apparatus for Pomatomus saltatrix according to claim 1, characterized in that, The oxygen supply assembly comprises a gas pump (16) fixedly connected to the top of the base (2), the gas pump (16) is connected with an external oxygen supply device at the gas inlet, the gas outlet of the gas pump (16) is connected with a gas collecting pipe (18), the gas collecting pipe (18) is connected with a chamber (19), one side of the chamber (19) away from the gas collecting pipe (18) is connected with an oxygen delivery pipe (17), and the other end of the oxygen delivery pipe (17) extends to the bottom of the inner barrel (4); and the inner diameter of the gas outlet of the gas pump (16) is larger than the inner diameter of the gas collecting pipe (18); the transmission shaft (14) extends into the chamber (19).

3. The artificial breeding and hatching apparatus for high body chub according to claim 2, characterized in that, The frame (1) is provided with a plurality of light lamps (20) located above the inner barrel (4) at the top.

4. The artificial breeding and hatching apparatus for Pomatomus saltatrix according to claim 3, characterized in that, The frame (1) is provided with an ultraviolet lamp column (21) extending between the inner barrel (4) and the outer barrel (8), and the position of the ultraviolet lamp column (21) is staggered with the position of the filter screen (6).

5. The artificial breeding and hatching apparatus for high body pomfret as claimed in claim 4 wherein, The outer wall of the inner barrel (4) and the inner wall of the outer barrel (8) are both provided with a plurality of flow resistance blocks (22).

6. The artificial breeding and hatching apparatus for Pomatomus saltatrix according to claim 5, characterized in that, The frame (1) is provided with a controller (28) at the top, and the controller (28) is electrically connected with a thermometer (23) extending into the inner barrel (4).

7. The artificial breeding and hatching apparatus for Pomatomus saltatrix according to claim 6, characterized in that, One end of the gas delivery pipe located in the inner barrel (4) is provided with a plurality of gas distribution pipes (25).

8. The artificial breeding and hatching apparatus for Pomatomus saltatrix according to claim 7, characterized in that, The rotating shaft (13) is provided with a sealing ring at the contact position with the outer barrel (8), the top of the base (2) is provided with a protective shell (26), and the first bevel gear (12), the second bevel gear (10) and the transmission gear (11) are all located in the protective shell (26).

9. The artificial breeding and hatching apparatus for high body pomfret as claimed in claim 8 wherein, The gas distribution pipes (25) are all provided with a partition net (27).

10. A method for artificial breeding and hatching of high body tuna, based on the artificial breeding and hatching device of any one of claims 1 to 9, characterized in that, The steps include: Step one, artificial induction of spawning of high body grouper: select healthy and mature female and male high body grouper, through artificial induction of spawning, make the female fish lay eggs into the water, and the male fish complete the natural fertilization of the eggs, and collect and preserve the fertilized eggs using a container; Step two, screening of fertilized eggs: let the container stand for a period of time, so that the bad eggs precipitate, and use a tool to suck the bad eggs; Step three, hatching of fertilized eggs: pour the screened fertilized eggs into the inner barrel (4) containing seawater, and start the air pump (16), the oxygen provided by the external oxygen supply equipment is transported into the seawater through the gas conveying pipe; At the same time, the gas in the gas conveying pipe drives the paddle (15) to rotate, and then drives the transmission shaft (14) and the transmission gear (11) to drive the inner barrel (4) and the outer barrel (8) to rotate in opposite directions, to disturb the seawater in the inner barrel (4) and the outer barrel (8), so that the seawater is dissolved with oxygen, and enough oxygen is obtained for the high body grouper eggs to hatch smoothly; Step four, replacement of seawater: use the external pump body to regularly extract and discharge the seawater in the inner barrel (4) and the outer barrel (8), and at the same time inject new seawater, to provide a suitable growth environment for the high body grouper larvae. ​

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