Incubation method and system for viscid eggs of freshwater fish

Abstract

The invention discloses a method and a system for hatching viscid eggs of freshwater fish, and relates to the technical field of hatching of viscid eggs of freshwater fish, the method is as follows: in an annular hatching pond, a plastic brush roller is used as a viscid egg attachment carrier, the viscid eggs are hatched under the stimulation of micro-flowing water, and an impeller is arranged on the plastic brush roller; the flowing speed of the micro-flowing water can drive the plastic brush roller to rotate through the impeller. Plastic brushes are adopted as adhesive egg attaching carriers, compared with palm bark serving as a carrier, saprolegniasis outbreak in water can be remarkably improved, plastic brush rollers are installed on the bearing rotating shafts on the inner wall of the hatching pond, water flows into the water flow guide channels of the hatching pond through the water outlet assembly, the water pump and the water flow filtering equipment, and therefore the hatching pond is more attractive in appearance. The viscous eggs are ensured to be incubated under the stimulation of micro-flowing water all the time, meanwhile, water flow can flow through each viscous egg, it is ensured that the viscous eggs obtain sufficient dissolved oxygen, and incubation of the viscous eggs is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of hatching freshwater fish sticky eggs, in particular to a hatching method and a system for hatching freshwater fish sticky eggs. Background Art

[0002] Sticky eggs belong to economically farmed fish, such as carp, crucian carp, bighead carp, and bream, all of which produce sticky eggs. The outer layer of the sticky egg membrane becomes sticky or has sticky threads when it comes into contact with water. After laying, the eggs attach to algae, reefs, shells and other attachment bases.

[0003] At present, the method for hatching freshwater fish sticky eggs is usually to adhere the fish eggs to an attachment carrier made of palm skin, and then place them in an incubation pool for incubation in static water or micro-flow water. However, this method has the following problems: static water incubation cannot provide sufficient dissolved oxygen for sticky eggs, which not only reduces the hatching rate, but also causes saprolegniasis or the proliferation of other pathogens; palm skin is used to attach sticky eggs, but due to the dense palm skin, the sticky eggs are located on the palm skin and form clumps and die due to lack of oxygen, which is prone to the outbreak of saprolegniasis. Therefore, we propose a method and system for hatching freshwater fish sticky eggs. Summary of the invention

[0004] The object of the present invention is to provide a method and system for hatching freshwater fish sticky eggs to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for hatching sticky eggs of freshwater fish comprises the following steps: in an annular hatching pool, a plastic brush roller is used as a carrier for attaching the sticky eggs, the plastic brush roller with the sticky eggs attached is completely immersed in fresh water, the fresh water in the annular hatching pool is in a micro-flowing state, and the sticky eggs are hatched under the stimulation of the micro-flowing water; wherein, an impeller is provided on the plastic brush roller, and the flow rate of the micro-flowing water can drive the plastic brush roller to rotate through the impeller without causing damage to the sticky eggs.

[0007] A further improvement is that the flow rate of the micro-flowing water is 0.3-0.6 m / s.

[0008] The present invention also provides a system for hatching freshwater fish sticky eggs using the above hatching method, comprising an annular hatching pool, the hatching pool is provided with a water flow guide channel, one end of the water flow guide channel is provided with a water outlet component, the other end of the water flow guide channel is connected to a flow pipeline, and the inner and outer side walls of the water flow guide channel are both provided with a plurality of groups of sticky egg hatching components in an annular array; wherein the sticky egg hatching components include: a plastic brush roller used as an attachment carrier for the sticky eggs;

[0009] The bearing shaft is rotatably inserted into the outer wall of the hatching tank and is detachably connected to one end of the shaft of the plastic brush roller;

[0010] The impeller part is arranged at the other end of the shaft of the plastic brush roller, and is driven by the flowing water in the water flow guide channel to drive the plastic brush roller to rotate, so that the sticky eggs on the plastic brush roller are in contact with the flowing water.

[0011] A further improvement is that the end of the circulation pipeline away from the water flow guide channel is connected to the seedling pool, the seedling pool is connected to the water inlet end of the water flow filtering device through the outlet pipeline, the water outlet end of the water flow filtering device is connected to the water pump, and the water pump is connected to the water outlet component.

[0012] A further improvement is that the impeller portion includes a hollow seat connected to the shaft portion of the plastic brush roller, the circumferential outer wall of the hollow seat is connected to a plurality of groups of arc-shaped blades, the end of the blade away from the hollow seat is provided with a connected one-way air outlet head, and the end of the bearing shaft away from the plastic brush roller is connected to the hollow seat;

[0013] Two adjacent groups of hollow seats on the outer wall of the hatching pool are connected to each other through an external pipeline, and two adjacent groups of hollow seats on the inner wall of the hatching pool are connected to each other through an internal pipeline. A hollow seat close to the water outlet component is connected to the air supply component through a pipeline, and the air supply component is arranged in a groove opened on the top of the hatching pool.

[0014] A further improvement is that the water outlet assembly comprises: a circulation seat, which is arranged on the incubation pool, the circulation seat is connected to a water outlet head through a pipeline, the water outlet head is embedded in the inner wall of one end of the water flow guide channel, the water inlet end of the circulation seat is connected to the water outlet end of the water inlet seat, the water inlet end of the water inlet seat is connected to a water pump, a hydraulic impeller group is arranged in the water inlet seat, and the shaft of the hydraulic impeller group is drivingly connected to the air supply assembly;

[0015] The water quality agent storage shell is arranged above the circulation seat, and its discharge port extends into the circulation seat. An electromagnetic valve is arranged in the discharge port, and the electromagnetic valve is electrically connected to an external controller, and the external controller is electrically connected to a water quality detection sensor, and the water quality detection sensor is embedded in the bottom wall of the water flow guide channel.

[0016] A further improvement is that the air supply assembly includes: an induced draft seat, which is arranged on the water inlet seat, and an induced draft impeller group is arranged in its inner cavity, the shaft of the induced draft impeller group is connected to the shaft of the hydraulic impeller group, and the outer wall of the induced draft seat is provided with an air inlet and an air outlet, and the air outlet is connected to a hollow seat close to the water outlet assembly.

[0017] A further improvement is that the water outlet assembly further comprises: a movable plate, one end of which is inserted into the outer wall of the circulation seat and used to close the outlet of the water quality medicine storage shell, an elastic member is provided between the movable plate and the circulation seat, and a through hole connected to the outlet is opened on the movable plate;

[0018] The air supply assembly also includes: an eccentric disk, which is sleeved on the shaft of the induced draft impeller group and located above the induced draft seat. The circumferential outer wall of the eccentric disk is in sliding contact with one end of the movable plate, and is used to drive the movable plate to move so that the feed port intermittently corresponds to the discharge port of the water quality agent storage shell.

[0019] A further improvement is that the end of the bearing shaft away from the hollow seat is connected to a connecting head, the connecting head is sleeved on the shaft of the plastic brush roller and is connected to the shaft, and a fixing piece is inserted into the connecting head for fixing the connecting head and the shaft of the plastic brush roller.

[0020] A further improvement is that one end of the bearing shaft extends into the hollow seat and is sleeved with a friction ring, a friction block is provided on the outside of the friction ring, the friction block is rotatably arranged on one end of the adjusting screw, and the other end of the adjusting screw is threaded through the hollow seat and connected to the handwheel.

[0021] A further improvement is that the blades are arc-shaped.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The present invention uses a plastic brush as a carrier for sticky egg attachment, which can significantly improve the outbreak of Saprolegniasis in water bodies compared to palm bark as a carrier;

[0024] 2) The present invention installs a plastic brush roller on the bearing shaft of the inner wall of the hatching pool, and allows the water flow guide channel of the hatching pool to flow water through the water outlet assembly, the water pump and the water flow filtering device, so as to ensure that the sticky eggs are always incubated in the micro-flow water stimulation, and at the same time, the water flow can flow through each sticky egg, so as to ensure that the sticky eggs obtain sufficient dissolved oxygen, which is conducive to the hatching of the sticky eggs;

[0025] 3) The present invention also provides an impeller on the plastic brush roller. On the one hand, the flowing water can drive the plastic brush roller to rotate, ensuring that the sticky eggs on the plastic brush roller are in full contact with the flowing water, preventing the situation that some sticky eggs cannot fully contact the flowing water. On the other hand, the rotation of the impeller increases the contact area between the water flow and the air, increases the dissolved oxygen in the water, and prevents the sticky eggs from dying due to lack of oxygen. This structure does not need to provide additional power, can further reduce the occurrence of water mold disease in the water body, and improve the reproduction rate of freshwater fish;

[0026] 4) After the sticky eggs are hatched, the fry can flow downstream through the circulation pipeline into the nursery pond, without the need for manual scooping and carrying, thereby reducing labor intensity and avoiding damage to the fry, which is conducive to the success of artificial breeding. In addition, a water pump and a water flow filtering device are used to control the flow speed of the water flowing in the water flow guide channel by adjusting the water pump, and the water flow filtering device is used to filter the flow water entering the water flow guide channel to ensure the flow water quality, improve the hatching rate of the sticky eggs, and prevent the growth of water mold in the water body;

[0027] 5) The present invention injects gas into each hollow seat through the air supply component, and the gas passes through the supporting shaft, the connecting head, the shaft of the plastic brush roller, the hollow seat and the blades and is ejected from the one-way air outlet head. On the one hand, the ejected gas can assist the impeller part to rotate better by utilizing the reaction force. On the other hand, the ejected gas enters the flowing water in the water flow guide channel along with the blades, increases the dissolved oxygen content of the flowing water and forms a group of microbubbles, ensuring that the sticky eggs obtain sufficient dissolved oxygen, which is beneficial to the hatching of the sticky eggs. At the same time, the air supply component and the air outlet component cooperate with each other. When the water quality detection sensor detects abnormal water quality, a quantitative agent can be added to the flowing water to improve the water quality and further prevent the growth of water mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the incubation system of the present invention;

[0029] Figure 2 For the present invention Figure 1 Another perspective structural diagram;

[0030] Figure 3 It is a schematic diagram of the structure of the sticky egg hatching assembly of the present invention;

[0031] Figure 4 For the present invention Figure 3 Another perspective structural diagram;

[0032] Figure 5 It is a cross-sectional view of the structure of the sticky egg hatching assembly of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the water outlet assembly and the air supply assembly of the present invention;

[0034] Figure 7 It is a schematic diagram of the partial structure of the water outlet component of the present invention;

[0035] Figure 8 It is a partial structural cross-sectional view of the air supply component of the present invention.

[0036] In the figure: 1. hatching pool; 2. water flow guide channel; 3. circulation pipeline; 4. seedling pool; 5. water flow filtering equipment; 6. water pump; 7. groove; 8. water outlet assembly; 81. circulation seat; 82. water outlet head; 83. water quality agent storage shell; 84. movable plate; 85. elastic member; 86. feed port; 87. water inlet seat; 88. hydraulic impeller group; 9. sticky egg hatching assembly; 91. plastic brush roller; 92. load-bearing shaft; 93. connector; 94. hollow seat; 95. blade; 96. one-way air outlet head; 97. hollow seat; 98. adjusting screw; 99. friction block; 910. friction ring; 10. inner pipeline; 11. outer pipeline; 12. water quality detection sensor; 13. air supply assembly; 131. induced draft seat; 132. induced draft impeller group; 133. eccentric disk. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] Please see attached Figure 1-2 A hatching system for freshwater fish sticky eggs is provided, including an annular hatching pool 1, a water flow guide channel 2 in an arc shape is opened on the hatching pool 1, a water outlet component 8 is arranged at one end of the water flow guide channel 2, a circulation pipeline 3 is connected to the other end of the water flow guide channel 2, and the end of the circulation pipeline 3 away from the water flow guide channel 2 is connected to a nursery pool 4, and the end of the circulation pipeline 3 is specifically connected to the top of the nursery pool 4, so that the flowing water enters the nursery pool 4 from a high place to prevent the fry in the nursery pool 4 from entering the circulation pipeline 3, and the nursery pool 4 is connected to the water inlet end of the water flow filtering device 5 through the outlet pipeline.

[0040] It should be noted that a screen can be provided at the outlet pipe to prevent the fry in the nursery pond 4 from entering the water flow filter device 5. The water flow filter device 5 can adopt conventional filtering equipment in the art to ensure the flowing water quality flowing in the water flow guide channel 2. Filtering flowing water impurities can prevent impurities from covering the egg membrane of the sticky egg around and causing the fertilized egg to die of hypoxia, and effectively reduce the breeding of water molds in the water body. The water outlet end of the water flow filter device 5 is connected to a water pump 6, and the water pump 6 is connected to a water outlet assembly 8. The water pump 6 is an adjustable water pump (such as a variable frequency centrifugal pump). By adjusting the water pump 6, the flowing water speed flowing in the water flow guide channel 2 can be controlled, thereby providing a micro-flowing water environment, ensuring that water flows in the annular hatching pool, avoiding the problem of the sticky egg egg membrane being injured due to excessive flow velocity, and further, the flow velocity of micro-flowing water is preferably 0.3-0.6m / s;

[0041] The inner and outer walls of the water flow guide channel 2 are provided with a plurality of groups of sticky egg hatching components 9 in a circular array;

[0042] The sticky egg hatching assembly 9 includes:

[0043] The plastic brush roller 91, as a carrier for incubating sticky eggs, is more economical and efficient than conventional materials such as palm bark. The plastic material is light and easy to obtain, not easy to rot and scale, not easy to breed harmful bacteria, and has a longer service life. Applying it as a carrier for attaching sticky eggs can effectively prevent the occurrence of saprolegniasis;

[0044] The bearing shaft 92 is rotatably inserted into the outer wall of the hatching tank 1 and is detachably connected to one end of the shaft of the plastic brush roller 91. A bearing is provided at the connection between the bearing shaft 92 and the hatching tank 1.

[0045] The impeller part is arranged at the other end of the shaft of the plastic brush roller 91, and is driven by the flowing water in the water flow guide channel 2 to drive the plastic brush roller 91 to rotate, so that the sticky eggs on the plastic brush roller 91 are in contact with the flowing water in all directions. Through this arrangement, under the action of the flowing water, the sticky eggs on the plastic brush roller 91 can be evenly grown, ensuring that the sticky eggs are always incubated in the stimulation of micro-flowing water. At the same time, the water flow can flow through each sticky egg to ensure that the sticky eggs obtain sufficient dissolved oxygen, which is beneficial to the hatching of the sticky eggs. At the same time, the rotation of the impeller part increases the contact area between the water flow and the air, increases the dissolved oxygen in the water, and prevents the sticky eggs from dying due to lack of oxygen. After the sticky eggs are hatched, the fry can go downstream to the nursery pond 4, without the need for manual scooping and transportation, which reduces the labor intensity and avoids damage to the fry, which is beneficial to the success of artificial breeding. The material of the plastic brush roller 91 is preferably lightweight plastic, and the interior thereof can be made hollow to further reduce its overall weight, thereby ensuring that the micro-flowing water can drive it to rotate through the impeller portion.

[0046] Furthermore, the end of the load-bearing shaft 92 of this embodiment away from the hollow seat 97 is connected to the connecting head 93, and the connecting head 93 is sleeved on the shaft of the plastic brush roller 91 and connected to the shaft. A fixing piece is inserted into the connecting head 93 for fixing the connecting head 93 and the shaft of the plastic brush roller 91. The fixing piece is, for example, a bolt, which facilitates the disassembly and assembly of the plastic brush roller 91 and the load-bearing shaft 92.

[0047] The method for hatching freshwater fish viscous eggs using the above-mentioned hatching system comprises the following steps:

[0048] S1: The water outlet assembly 8 injects flowing water into the water flow guide channel 2, attaches the sticky eggs to the plastic brush roller 91, and then installs the plastic brush roller 91 on the bearing shaft 92;

[0049] S2: The flowing water flows from one end of the water flow guide channel 2 to the other end and then is discharged from the circulation pipeline 3. During the flowing water, the impeller part is driven, and the impeller part drives the plastic brush roller 91 to rotate, so that the sticky eggs attached to the plastic brush roller 91 are in full contact with the flowing water and are hatched in the flowing water environment;

[0050] S3: The fry hatched from the sticky eggs are discharged from the circulation pipeline 3 along the flow water.

[0051] Example 2

[0052] Please see attached Figure 3-5On the basis of Example 1, the impeller part of this embodiment includes a hollow seat 94 connected to the shaft of the plastic brush roller 91, the vertical section of the hollow seat 94 is cylindrical, and the outer wall of the circumference of the hollow seat 94 is connected with a plurality of blades 95, the blades 95 are arc-shaped, and the end of the blade 95 away from the hollow seat 94 is provided with a connected one-way air outlet head 96, the one-way air outlet head 96 is a nozzle with a one-way valve inside, so that water is not easy to enter, and the end of the bearing shaft 92 away from the plastic brush roller 91 is connected with a hollow seat 97;

[0053] Two adjacent groups of hollow seats 97 on the outer wall of the hatching pool 1 are connected to each other through an outer pipe 11, and two adjacent groups of hollow seats 97 on the inner wall of the hatching pool 1 are connected to each other through an inner pipe 10. A hollow seat 97 near the water outlet assembly 8 is connected to the air supply assembly 13 through a pipe, and the air supply assembly 13 is arranged in a groove 7 opened on the top of the hatching pool 1;

[0054] Gas is injected into each hollow seat 97 through the air supply component 13, and the gas passes through the supporting shaft 92, the connecting head 93, the shaft of the plastic brush roller 91, the hollow seat 94 and the blades 95 and is ejected from the one-way gas outlet head 96. On the one hand, the ejected gas can assist the impeller part to rotate better by utilizing the reaction force. On the other hand, the ejected gas enters the flowing water in the water guide channel 2 along the blades 95, increasing the dissolved oxygen content of the flowing water and forming a group of microbubbles, thereby ensuring that the sticky eggs obtain sufficient dissolved oxygen, which is beneficial to the hatching of the sticky eggs. In addition, the turbulent effect generated by the gas injection can destroy the water boundary layer, which plays a certain role in preventing pollutants from being deposited on the surface of the blades 95.

[0055] Furthermore, one end of the load-bearing shaft 92 of the present embodiment extends into the hollow seat 97 and is sleeved with a friction ring 910, and a friction block 99 is provided on the outer side of the friction ring 910. The friction ring 910 and the friction block 99 can be made of wear-resistant rubber material. The friction block 99 is rotatably arranged at one end of the adjusting screw 98, and the other end of the adjusting screw 98 is threadedly penetrated through the hollow seat 97 and connected to the hand wheel. By rotating the hand wheel, the friction block 99 is driven to move through the adjusting screw 98. By adjusting the contact between the friction block 99 and the friction ring 910, the rotation speed of the plastic brush roller 91 can be adjusted to prevent the plastic brush roller 91 from rotating too fast, thereby ensuring that the plastic brush roller 91 runs stably within the optimal speed range.

[0056] Example 3

[0057] Please see attached Figure 6-8 Based on Example 2, the water outlet assembly 8 of this embodiment includes:

[0058] The circulation seat 81 is arranged on the hatching pool 1. The circulation seat 81 is connected to the water outlet 82 (a nozzle or water outlet device for supplying flowing water) through a pipeline. The water outlet 82 is used to make the flowing water flow from one end of the water flow guide channel 2 to the other end of the water flow guide channel 2. The water outlet 82 is embedded in the inner wall of one end of the water flow guide channel 2. The water inlet end of the circulation seat 81 is connected to the water outlet end of the water inlet seat 87. The water inlet seat 87 is arranged in the groove 7. The water inlet end of the water inlet seat 87 is connected to the water pump 6. A hydraulic impeller group 88 is arranged in the water inlet seat 87. The shaft of the hydraulic impeller group 88 is transmission-connected with the air supply component 13. The water supplied by the water pump 6 enters the water inlet seat 87, then enters the circulation seat 81 from the water inlet seat 87, and then flows out through the water outlet 82. When the water flows in the water inlet seat 87, the hydraulic impeller group 88 is driven to rotate, and the hydraulic impeller group 88 drives the air supply component 13 to work;

[0059] The water quality agent storage shell 83 is arranged above the circulation seat 81. The water quality agent storage shell 83 stores agents for adjusting water quality, such as iodine preparations, thioether floxacin, methylene blue, quicklime or formaldehyde solution (formalin), etc. Its discharge port extends into the circulation seat 81. A solenoid valve (not shown in the figure) is arranged in the discharge port. The solenoid valve is electrically connected to an external controller, and the external controller is electrically connected to a water quality detection sensor 12. The water quality detection sensor 12 is embedded in the bottom wall of the water flow guide channel 2. The water quality data is detected by the water quality detection sensor 12 and sent to the outside. The controller enables the external controller to control the solenoid valve to open when the detected water quality data exceeds the preset threshold value. At this time, the medicine in the water quality medicine storage shell 83 enters the circulation seat 81 from the discharge port and contacts and mixes with the flowing water entering the circulation seat 81, and then flows in the water flow guide channel 2, effectively preventing the growth of water mold in the water body. The water quality data detected by the water quality detection sensor 12 restores the preset threshold value, so that the external controller controls the solenoid valve to close. The above-mentioned water quality detection sensor 12 can adopt a multi-parameter water quality sensor, which is a conventional equipment in this field and is not described in detail here.

[0060] Furthermore, the air supply assembly 13 of this embodiment includes:

[0061] The induced draft seat 131 is arranged on the water inlet seat 87, and an induced draft impeller group 132 is arranged in its inner cavity. The shaft of the induced draft impeller group 132 is connected to the shaft of the hydraulic impeller group 88. The induced draft impeller group 132 includes a blade shaft and induced draft fan blades arranged on the outer wall of the blade shaft. The outer wall of the induced draft seat 131 is provided with an air inlet and an air outlet. The air outlet is connected to a hollow seat 97 close to the water outlet component 8. A filter screen is arranged in the air inlet. When the hydraulic impeller group 88 rotates, the induced draft impeller group 132 is driven to rotate, so that the external gas enters the air inlet, is filtered by the filter screen, and is discharged from the air outlet through the pipeline to each hollow seat 97.

[0062] Furthermore, the water outlet assembly 8 of this embodiment further includes:

[0063] The movable plate 84 has one end inserted into the outer wall of the circulation seat 81 to close the discharge port of the water-based medicine storage shell 83. An elastic member 85 (such as a spring) is provided between the movable plate 84 and the circulation seat 81. The movable plate 84 is provided with a material passage 86 connected to the discharge port.

[0064] Furthermore, the air supply assembly 13 also includes:

[0065] The eccentric disk 133 is sleeved on the shaft of the induced draft impeller assembly 132 and is located above the induced draft seat 131. The circumferential outer wall of the eccentric disk 133 is in sliding contact with one end of the movable plate 84. A ball may be embedded at one end of the movable plate 84 to contact the circumferential outer wall of the eccentric disk 133, so as to drive the movable plate 84 to move so that the material passage 86 intermittently corresponds to the material outlet of the water quality medicine storage shell 83.

[0066] When the induced draft impeller group 132 rotates, it also drives the eccentric disk 133 to rotate. The eccentric disk 133 intermittently pushes the movable plate 84 to move back and forth, and then the material outlet 86 intermittently corresponds to the discharge port of the water quality agent storage shell 83. If the solenoid valve is opened, the medicine in the water quality agent storage shell 83 enters the circulation seat 81 in a quantitative manner and is mixed with the flowing water entering the circulation seat 81 and input into the water flow guide channel 2. If the solenoid valve is closed, the medicine in the water quality agent storage shell 83 does not enter the circulation seat 81.

[0067] To verify the hatching effect of this system, sticky eggs of Culter alba and Crucian carp were hatched at Anhui Wanjiang Fisheries Technology Research Institute Co., Ltd. The water temperature was controlled at 24-26℃ during the hatching process, and random samples were taken from the hatching pool on the second day of hatching. After Saprolegnia infection, white or grayish white mycelium will appear on the surface of the eggs. Through microscopic observation, it is possible to directly observe whether there are mycelium or spores of Saprolegnia on the surface or inside of the fish eggs. Finally, the number of infected eggs was counted and the incidence rate was calculated.

[0068] Incidence (%) = (number of infected eggs / total number of eggs) × 100

[0069] At the same time, two groups of controls were set up: ① the friction ring 910 was locked by the friction block 99, so that the plastic brush roller 91 was always in a static state; ② the palm skin carrier was used to replace the plastic brush roller 91 for hatching. The results showed that when the present system was used to hatch sticky eggs, without adding any agents, the hatching rate of saprolegniasis in the plastic brush roller system rotating with the running water was about 15%, while the incidence of saprolegniasis in the static brush roller system was about 18%, and the incidence of saprolegniasis in the hatching system using the palm skin carrier was 28%. It can be seen that the selection of the plastic carrier can greatly inhibit the growth of saprolegniasis during the hatching process of sticky eggs, and the plastic brush roller system that can rotate with the running water also has a certain positive effect in controlling saprolegniasis.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for hatching freshwater fish viscous eggs, characterized in that: In an annular hatching pool (1), a plastic brush roller (91) is used as a carrier for the sticky eggs to attach. The plastic brush roller (91) with the sticky eggs attached is completely immersed in fresh water. The fresh water in the annular hatching pool (1) is in a micro-flowing state, and the sticky eggs are hatched under the stimulation of the micro-flowing water. The plastic brush roller (91) is provided with an impeller, and the micro-flowing water can drive the plastic brush roller (91) to rotate through the impeller.

2. A method for hatching freshwater fish viscous eggs according to claim 1, characterized in that: The flow rate of the micro-flow water is 0.3-0.6 m / s.

3. A system for hatching freshwater fish sticky eggs using any hatching method according to any one of claims 1 to 2, comprising an annular hatching pool (1), wherein a water flow guide channel (2) is provided on the hatching pool (1), characterized in that: One end of the water flow guide channel (2) is provided with a water outlet assembly (8), the other end of the water flow guide channel (2) is connected to a circulation pipeline (3), and the inner and outer side walls of the water flow guide channel (2) are both provided with a plurality of groups of sticky egg hatching assemblies (9) in a circular array; wherein: The sticky egg hatching assembly (9) comprises: A plastic brush roller (91) is used as a carrier for the sticky eggs to attach to; A bearing shaft (92) is rotatably inserted into the outer wall of the hatching pool (1) and is detachably connected to one end of the shaft of the plastic brush roller (91); The impeller part is arranged at the other end of the shaft of the plastic brush roller (91), and is driven by the flowing water in the water flow guide channel (2) to drive the plastic brush roller (91) to rotate, so that the sticky eggs on the plastic brush roller (91) are in contact with the flowing water.

4. The system according to claim 3, characterized in that: One end of the circulation pipeline (3) away from the water flow guide channel (2) is connected to the seedling cultivation pool (4), and the seedling cultivation pool (4) is connected to the water inlet end of the water flow filtering device (5) through the water outlet pipeline. The water outlet end of the water flow filtering device (5) is connected to the water pump (6), and the water pump (6) is connected to the water outlet component (8).

5. The incubation system according to claim 4, characterized in that: The impeller part comprises a hollow seat (94) connected to the shaft of the plastic brush roller (91); the circumferential outer wall of the hollow seat (94) is connected to a plurality of groups of arc-shaped blades (95); one end of the blades (95) away from the hollow seat (94) is provided with a connected one-way air outlet head (96); and one end of the bearing shaft (92) away from the plastic brush roller (91) is connected to a hollow seat (97); Two adjacent groups of hollow seats (97) on the outer wall of the hatching pool (1) are connected to each other via an external pipeline (11), and two adjacent groups of hollow seats (97) on the inner wall of the hatching pool (1) are connected to each other via an internal pipeline (10). A hollow seat (97) close to the water outlet assembly (8) is connected to an air supply assembly (13) via a pipeline, and the air supply assembly (13) is arranged in a groove (7) opened at the top of the hatching pool (1).

6. The system according to claim 5, characterized in that: The water outlet assembly (8) comprises: A circulation seat (81) is arranged on the hatching pool (1); the circulation seat (81) is connected to a water outlet (82) through a pipeline; the water outlet (82) is embedded in the inner wall of one end of the water flow guide channel (2); the water inlet end of the circulation seat (81) is connected to the water outlet end of a water inlet seat (87); the water inlet end of the water inlet seat (87) is connected to a water pump (6); a hydraulic impeller group (88) is arranged in the water inlet seat (87); the shaft of the hydraulic impeller group (88) is drivingly connected to the air supply assembly (13); A water quality agent storage shell (83) is arranged above the circulation seat (81), and its discharge port extends into the circulation seat (81). A solenoid valve is arranged in the discharge port, and the solenoid valve is electrically connected to an external controller, and the external controller is electrically connected to a water quality detection sensor (12). The water quality detection sensor (12) is embedded in the bottom wall of the water flow guide channel (2).

7. The system according to claim 6, characterized in that: The air supply assembly (13) comprises: The draft seat (131) is arranged on the water inlet seat (87), and an inner cavity thereof is provided with a draft impeller assembly (132), the shaft of the draft impeller assembly (132) is connected to the shaft of the hydraulic impeller assembly (88), and an air inlet and an air outlet are arranged on the outer wall of the draft seat (131), and the air outlet is communicated with a hollow seat (97) close to the water outlet assembly (8).

8. The system according to claim 7, characterized in that: The water outlet assembly (8) further comprises: A movable plate (84) is inserted at one end into the outer wall of the circulation seat (81) for closing the discharge port of the water-based medicine storage shell (83); an elastic member (85) is provided between the movable plate (84) and the circulation seat (81); and a material passage (86) communicating with the discharge port is provided on the movable plate (84); The air supply assembly (13) further comprises: The eccentric disk (133) is sleeved on the shaft of the induced draft impeller assembly (132) and is located above the induced draft seat (131). The circumferential outer wall of the eccentric disk (133) is in sliding contact with one end of the movable plate (84) and is used to drive the movable plate (84) to move so that the material passage (86) intermittently corresponds to the material outlet of the water quality agent storage shell (83).

9. The system according to claim 4, characterized in that: One end of the bearing shaft (92) away from the hollow seat (97) is connected to a connecting head (93), and the connecting head (93) is sleeved on the shaft of the plastic brush roller (91) and is connected to the shaft, and a fixing piece is inserted into the connecting head (93) for fixing the connecting head (93) and the shaft of the plastic brush roller (91).

10. The system according to claim 4, characterized in that: One end of the bearing shaft (92) extends into the hollow seat (97) and is sleeved with a friction ring (910). A friction block (99) is provided on the outer side of the friction ring (910). The friction block (99) is rotatably arranged on one end of the adjusting screw (98). The other end of the adjusting screw (98) is threadedly penetrated through the hollow seat (97) and is connected to a hand wheel.

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