CN105393961B - The hatching method of germ cell during a kind of Micropterus salmoides is the most numerous - Google Patents

Abstract

The invention belongs to the field of fish breeding, and in particular relates to a method for hatching fertilized eggs in the early breeding process of largemouth bass. The hatching method includes building a hatching greenhouse, the hatching greenhouse includes a hatching pool, and a greenhouse body located on the hatching pool, putting artificial fish nests attached with fertilized eggs into the hatching pool, and establishing a temperature control system in the hatching greenhouse The system controls the water temperature of the hatching tank at 25-28°C. In a further technical solution, a matching hatching water filtration system is established upstream of the hatching pool, and a water outlet structure is established downstream of the hatching pool. Practice has shown that establishing a temperature control system in the hatching tank and controlling the water temperature of the hatching tank to 25-28°C can effectively prevent the fertilized eggs of largemouth bass from being infected with saprolegniasis, and greatly improve the hatching survival rate of fertilized eggs. The hatching water filtration system can ensure the hatching water quality and prevent harmful organisms from entering the hatching tank. The water outlet structure is also used in the process of changing the water or running water in the hatching tank.

Description

A method for hatching fertilized eggs in the early breeding process of largemouth bass

technical field

The invention belongs to the field of fish breeding, and in particular relates to a method for hatching fertilized eggs in the early breeding process of largemouth bass.

Background technique

In the reproduction and production of fish, the fry bred earlier can be sold at a higher price due to the vacancy of the market, and can occupy the market as soon as possible to obtain more benefits. Therefore, more and more largemouth bass are brought to the market early through early breeding. During the artificial early breeding of largemouth bass, after the parent fish of largemouth bass are fertilized, the fertilized eggs of largemouth bass are fertilized through artificial fish nests. It is collected and then placed in a special hatching tank for hatching. However, during the hatching process, the fertilized eggs of largemouth bass are very susceptible to saprolegniasis, resulting in the death of fertilized eggs and a low hatching survival rate.

Contents of the invention

The invention provides a method for hatching fertilized eggs in the early breeding process of largemouth bass, which can effectively improve the hatching rate of fish fertilized eggs.

In order to realize the purpose of the present invention, the present invention has adopted following technical scheme:

A method for hatching fertilized eggs in the early breeding process of largemouth bass, comprising constructing a hatching greenhouse, placing an artificial fish nest attached with fertilized eggs into a hatching pond in the hatching greenhouse, and establishing a temperature control system in the hatching greenhouse to control The water temperature in the hatching tank is 23-28°C.

A further technical solution: establish a matching hatching water filtration system upstream of the hatching pool, and establish a water outlet structure downstream of the hatching pool.

A further technical solution: the hatching greenhouse includes the hatching pond, and a greenhouse body composed of a steel structure support above the hatching pond and a light-transmitting film covering the outside of the steel support; the hatching pond includes several mutually isolated incubation unit.

A further technical solution: the steel support is provided with a slot for fixing the light-transmitting film, and the light-transmitting film is pressed into the slot by an S-shaped bead.

A further technical solution: a light bulb is hoisted above the hatching pool, and the display panel of the temperature control system is suspended above the hatching pool; the greenhouse is equipped with equipment for increasing micropore oxygen into the hatching pool; the The outside of the greenhouse body is covered with sunshade nets; windows for user ventilation are arranged on the greenhouse body.

A further technical solution: the hatching water filtration system includes a filter unit, and the filter unit includes a first-stage filter, a second-stage filter, and a third-stage filter that are sequentially intercepted along the flow direction of the water body, and the apertures of the filter screens are gradually reduced. net, four-stage filter, a water agitation device is provided beside the third-stage filter and/or the fourth-stage filter, and the agitation device is an impeller type aerator.

A further technical solution: the filter unit also includes a water pump and a water pump, and the water pump pumps the water from the reservoir into the hatching tank through the water pipe, and the first-stage filter and the second-stage filter are located in the water pipe respectively. The water inlet and water outlet; the third-stage filter and the fourth-stage filter are located in the hatching tank, and the impeller aerator is arranged on the side of the four-stage filter away from the third-stage filter.

Further technical solution: the aperture of the secondary filter screen is 100-180 mesh, the secondary filter screen is a net pocket structure, and the net pocket mouth is set on the water outlet of the suction pipe; the aperture diameter of the three-stage filter screen is The pore size of the fourth-stage filter is 180 mesh, and the aperture of the fourth-stage filter is 200 mesh; the third-stage filter and the fourth-stage filter are fixed on the corresponding brackets, and the bracket for fixing the third-stage filter is the same as the bracket for fixing the fourth-stage filter. The bracket is fixedly connected, and the support for fixing the four-stage filter screen is also fixedly connected with the bracket arranged on the side of the four-stage filter screen away from the three-stage filter screen; the length of the three-stage filter screen and the four-stage filter screen is 10-60 meters; there are several impeller-type aerators arranged sequentially along the arrangement direction of the four-stage filter screen.

Further technical solution: the water outlet structure includes a vertical pipe section located in the hatching tank and vertically arranged to the bottom of the hatching pool, the top of the vertical pipe section is sleeved and connected with a metal mesh pipe; the pipe wall of the metal mesh pipe is sleeved on the vertical pipe section The outside of the pipe wall, and the metal mesh pipe and the vertical pipe section are fixed by clamps; the water outlet structure also includes an active pipe section located outside the hatching tank and connected with the vertical pipe section, and the clamp between the axial direction and the horizontal plane of the active pipe section The angle can be adjusted, and the maximum vertical height of the water level in the movable pipe section is lower than the sum of the heights of the vertical pipe section and the metal mesh pipe.

A further technical solution: the metal mesh pipe is made of stainless steel; the vertical pipe section communicates with the movable pipe section through a horizontal pipe section that runs through the wall of the hatching tank, and the movable pipe section communicates with the horizontal pipe section through a first right-angle pipe joint , the first right-angle pipe joint axially rotates around the horizontal pipe section and drives the movable pipe section to rotate; the vertical pipe section communicates with the horizontal pipe section through the second right-angle pipe joint.

The beneficial effects of the present invention are:

(1) Practice shows that the present invention establishes a temperature control system in the hatching pond, and when the water temperature of the hatching pond is controlled at 25-28° C., it can effectively prevent the fertilized eggs of largemouth bass from infecting saprolegniasis, and greatly improve the hatching survival rate of the fertilized eggs.

(2) Since the steel structure support is used to support the greenhouse body in the hatching greenhouse of the present invention, its structure is stronger and has a longer service life than the traditional support made of bamboo poles. The light-transmitting film can transmit light and heat up naturally, which is conducive to the hatching of fertilized eggs; in addition, during the fry cultivation process, sunlight can sterilize and accelerate the growth of fry. In addition, the hatching greenhouse with the above-mentioned structure has a large internal space, can accommodate a sufficiently large hatching pool, and is easy to operate. Multiple incubation units are beneficial to separate different batches of fertilized eggs, which is beneficial to improve the survival rate of hatching. The cooperation between the card slot and the bead is very ingenious to fix the light-transmitting film on the steel structure support. The groove wall of the card slot forms a bent structure from the notch to the groove, which is beneficial for the bead to press the light-transmitting film and Put it in the card slot and lock it. The hatching greenhouse is very convenient to build, and the structure is stable and firm. When the fry are tamed after they come out of the film, use the phototaxis of the fry to concentrate the fry in a small area through a light bulb, so that they can concentrate on feeding the bait, which is beneficial to improve the effect of domestication.

(3) The hatching water filtration system in the present invention solves the clogging problem of the filter screen by adding a stirring device under the condition that the filtration effect is good, and can ensure the supply requirement of a large amount of aquaculture water. The filtration system is fully mechanized, saves manpower, is easy to operate, and improves the filtration efficiency. The impeller type aerator is selected as the agitation device, which can not only increase oxygen for the water body, but also avoid the clogging of the filter screen, and the effect is obvious. The step-by-step filtration of the primary filter, the secondary filter, the third filter, and the fourth filter further ensures the water quality requirements of fish breeding water.

(4) The structure of the water outlet in the present invention is simple. While ensuring a large amount of water outlet, the fish fry can also be effectively blocked to prevent the fish fry from escaping, and the water changing process can be carried out quickly. The angle between the axial direction and the horizontal plane of the movable pipe section connected with the vertical pipe section in the water outlet structure can be adjusted, so that the adjustment of the water level in the hatching tank can be realized.

Description of drawings

Fig. 1 is the structural representation of hatching greenhouse in the present invention.

Figure 2 is a top view of the hatching tank.

Fig. 3 is a schematic diagram of the cooperative use of the clamping groove on the steel structure support and the bead.

Fig. 4 is a structural schematic diagram of layering.

5 and 6 are structural schematic diagrams of the hatching water filtration system in the present invention.

Fig. 7 is a schematic diagram of the water outlet structure in the present invention.

The specific meanings of the reference signs in the accompanying drawings are as follows:

120-Hatch tank 121-Hatch unit 122-Water injection pipe 123-Water outlet structure

123a-vertical pipe section 123b-movable pipe section 123c-metal mesh pipe 123d-horizontal pipe section

123e-first right-angle pipe joint 123f-second right-angle pipe joint 124-drain

130-greenhouse body 131-steel structure support 131a-card slot 131b-layering strip

132-translucent film 133-shading net 134-window 140-bulb 150-display panel

160-Filter unit 161-First filter 162-Second filter 163-Third filter

164-four-stage filter 165-pumping pipe 170-impeller aerator 180-reservoir

detailed description

The hatching method comprises building a hatching greenhouse, putting artificial fish nests attached with fertilized eggs into a hatching pond in the hatching greenhouse, and establishing a temperature control system in the hatching greenhouse to control the water temperature of the hatching pond at 23-28°C. Practice has shown that establishing a temperature control system in the hatching pool and controlling the water temperature of the hatching pool at 23°C, 25°C, and 28°C can effectively prevent the fertilized eggs of largemouth bass from being infected with saprolegniasis and greatly improve the hatching survival rate of fertilized eggs. What needs to be explained is: in fact, during the production operation, the water temperature in the hatching pond is only controlled at 23-28°C when the outdoor water temperature is high in the later stage of reproduction; because in the early stage of reproduction, the water temperature in the spawning pond is about 18°C. The temperature of the water rises to 23-28°C. If the temperature difference is too large, it may affect the hatching of fertilized eggs. Therefore, the gradual temperature rise of the general temperature control system will not make the temperature difference between the hatching pool and the spawning pool exceed 5°C.

In order to ensure the hatching water quality and prevent harmful organisms from entering the hatching pool 120, the present invention establishes a matching hatching water filtration system at the upstream of the hatching pool 120, and establishes a water outlet structure 123 at the downstream of the hatching pool 120. The water outlet structure is also used to clean the hatching pool. During water change or running water operation.

Now in conjunction with the accompanying drawings, the hatching greenhouse, the hatching water filtration system, and the water outlet structure are further described in the present invention:

Incubation greenhouse, as shown in Figures 1, 2, 3, and 4:

The hatching greenhouse includes a hatching tank 120 , and the hatching greenhouse also includes a greenhouse body 130 composed of a steel structure support 131 above the hatching tank 120 and a light-transmitting film 132 covering the outside of the steel structure support 131 . Since the present invention adopts the steel structure support 131 to support the light-transmitting film 132, its structure is stronger and has a longer service life than the traditional support made of bamboo poles. The light-transmitting film 132 can transmit light and heat up naturally, which is beneficial to the hatching of fertilized eggs; in addition, during the fry cultivation process, sunlight can sterilize and accelerate the growth of fry. In addition, the hatching greenhouse with the above-mentioned structure has a large internal space, can accommodate a sufficiently large hatching pool, and is easy to operate.

The hatching pool 120 includes several hatching units 121 isolated from each other. For example, when largemouth bass breeds, the fertilized eggs of the first day and the second day cannot be put together, because the fertilized eggs with a difference of one day will have a large difference in the later fry, and large fry will compete with small fry, which will form Vicious circle, finally the big fry will eat the small fry, even sometimes the big fry can't eat the small fry, the small fry will get stuck in the throat of the big fry, both fish will die, so many hatchings are needed Unit, which is beneficial to separate different batches of fertilized eggs. In our actual use, sometimes due to weather and other reasons, there are few fertilized eggs collected, and it is still a waste of space in the pool to be placed in one hatching unit. You can put about 2 dense meshes in one hatching unit to separate the hatching unit. Divide into smaller hatching areas for different batches of fertilized eggs. Of course, the hatching unit can also be made smaller when initially built.

The upstream of the hatching pool 120 is provided with a water injection pipe 122 for injecting flowing water into the hatching pool 120 , and the downstream of the hatching pool 120 is provided with a water outlet structure 123 . The water in and out of the hatch tank 120 is convenient like this, which is beneficial to changing water. For example, the hatching temperature of largemouth bass is generally best at 25-28°C, which can reduce the occurrence of saprolegniasis. The structure can realize the purpose of gradually lowering the temperature by flushing the hatch tank 120 .

As shown in Figures 3 and 4: the steel support 131 is provided with a slot 131a for fixing the light-transmitting film, and the light-transmitting film is pressed into the slot 131a by an S-shaped bead 131b. This structure is very ingenious to fix the light-transmitting film on the steel support 131. The groove wall of the card slot 131a forms a bent structure from the notch to the groove, which is beneficial for the bead 131b to press the light-transmitting film and place it side by side. It is stuck in the slot 131a. The greenhouse is very convenient to build, and the structure is stable and firm.

A light bulb 140 is hoisted above the hatching tank 120 . When the fish fry are tamed after they come out of the film, the light bulb 140 is used to concentrate the fish fry in a small area by using the phototaxis of the fish fry, so that the bait can be fed intensively, which is beneficial to improve the taming effect.

The greenhouse is equipped with a temperature control system for measuring the water temperature in the hatching tank 120 , and the display panel 150 of the temperature control system is suspended above the hatching tank 120 . The temperature control system can control the temperature in the hatching tank and control the hatching of fertilized eggs. The display panel 150 is beneficial to the breeder to watch the temperature, and adjust the temperature of the hatching chamber accordingly in time.

The greenhouse is equipped with equipment for adding oxygen to the micropores in the hatching pond 120 . Microporous aeration equipment is conducive to the hatching of fertilized eggs; since fish fertilized eggs are generally produced on fish nests, microporous aeration equipment can increase the placement density of fish nests with fertilized eggs, which is conducive to improving the utilization rate of hatching pools.

The outside of the greenhouse body is covered with a sunshade net 133 . In sunny and high temperature weather, in order to prevent the hatching room temperature from being too high, the sunshade net can be pulled up to cool down; when the hatching room needs to be heated up, the sunshade net can be pulled away, which is very convenient to use.

The greenhouse body 130 is provided with windows 134 for user ventilation. At noon in sunny and hot weather, if the temperature in the greenhouse body 130 is too high, you can also open the front and rear windows 134 to ventilate and cool down.

Hatching water filtration system, as shown in Figures 5 and 6:

The hatching water filtration system includes a filtration unit 160, and a water stirring device is arranged beside the filter screen of the filtration unit 160. Generally speaking, when the water body passes through the filter screen in the filter unit 160, a large amount of sundries are easily attached to the screen surface, which is easy to cause the blockage of the mesh, and by setting the water body stirring device on the side of the filter screen, the stirring device will It has a certain stirring effect on the water body beside the filter screen, and the sundries in the water body will always be in a stirring state under the action of the stirring device, so when the water body passes through the screen screen, the sundries will not flow with the water body and adhere The mesh is clogged on the surface of the filter screen, even if the debris is attached to the mesh surface, the debris can be washed down by the action of the agitating device, which will not cause the problem of mesh clogging.

The stirring device is an impeller aerator 170 . The impeller type aerator 170 can also aerate the water while providing sufficient oxygen to the fish breeding water body, so that the toxic and harmful substances in the water body can be volatilized, the concentration of harmful substances can be reduced, and the water quality can be improved. The rotation of its impeller of the aerator 170 can also make the water body be in a state of agitation, prevent foreign matter in the water body from adhering to the mesh surface of the filter screen, and avoid the blockage of the filter screen mesh. The impeller type aerator 170 avoids the traditional manual brushing process and reduces the labor cost of farming.

The filter unit 160 includes a primary filter 161 , a secondary filter 162 , a tertiary filter 163 , and a fourth filter 164 which are sequentially intercepted along the flow direction of the water body. Here the primary filter 161 is mainly used to intercept larger fish, shrimps and sundries to prevent damage to the water pump, and its mesh should be the largest; the secondary filter 162 is mainly used to intercept zooplankton; the tertiary filter 163 It is mainly used to intercept small impurities in the water body, such as small miscellaneous fish and fish eggs; the four-stage filter 164 further filters the small impurities in the water body, and its mesh is the smallest, and finally ensures that the filtered water body meets the breeding requirements of perch.

The agitating device is located beside the third-stage filter screen 163 and/or the fourth-stage filter screen 164 . Since tiny impurities in the water body are more likely to cause blockage of the mesh, agitating devices are set on the side of the relatively smaller three-stage filter screen 163 and the fourth-stage filter screen 164, which can effectively avoid the three-stage filter screen 163, four-stage filter screen 164, etc. The meshes of the four-stage filter screen 164 are blocked by tiny impurities, which eliminates the manual brushing operation, saves manpower, and improves the filtration efficiency. Here the impeller type aerator 170 should not be set too far away from the filter screen, otherwise the effect of washing away the stolen goods cannot be reached.

The filter unit 160 also includes a water pump and a water suction pipe 165. The water pump pumps water from the reservoir 180 into the hatching tank 120 through the water suction pipe 165. The primary filter 161 and the secondary filter 162 are located at the water suction pipe 165 respectively. The water inlet and the water outlet; the three-stage filter screen 163 and the four-stage filter screen 164 are located in the hatch tank, and the impeller type aerator 170 is far away from the third-stage filter screen 163 in the four-stage filter screen 164 Arranged on one side. Here, the reservoir 180 is generally a river or a ditch, and the primary filter 161 is arranged in the river or the ditch at a distance from the front end of the suction pipe. The primary filter screen 161 passes through the effect of the water pump, and the water body to be filtered in the reservoir 180 is filtered through the primary filter screen 161 successively, enters the water suction pipe 165, and the secondary filter screen 162 filters and enters the hatching tank. 1, the four-stage filter screen 164 is located in the hatching pond, so the hatching pond is divided into two parts of the area, the water body of the above-mentioned filtering process flows through the three-stage filter screen 163 and the four-stage filter screen 164 from the hatching pool side area to obtain re-filtering treatment, and finally Makes the water flowing into the other side of the hatchery tank available for fish reproduction. At the same time, the impeller type aerator 170 can be arranged on the side away from the third stage filter screen 163 in the four-stage filter screen 164 to achieve the purpose of avoiding debris from blocking the mesh. If the water flow rate is slow, the impeller type aerator 170 here You can choose a smaller power. The water pump used for pumping water is generally a 3kw one, and the specification and quantity of the water pump can be determined according to the water consumption. Here, when the water storage tank 180 is built, the position of the water outlet should be higher than that of the hatching tank 120, so as to ensure that water can automatically flow to the hatching tank 120, and at the same time, the size of the water flow is controlled by a valve.

The pore size of the secondary filter 162 is 100-180 mesh, the secondary filter 162 is a mesh bag structure, and the mesh bag mouth is sleeved on the water outlet of the suction pipe 165 . That is, the water outlet of the suction pipe 165 is covered with a net bag that intercepts zooplankton to form a secondary filter screen 162, and the net bag generally has a length of 5 meters. The mesh of the net bag is generally between 100-180 mesh, and the mesh should not be too dense. If it is too dense, the net bag will be filled with zooplankton soon due to the fast water inflow. Therefore, the choice of mesh size plays a key role in the normal and orderly filtration.

Preferably, the pore size of the third-stage filter 163 is 180 mesh, and the pore size of the fourth-stage filter 164 is 200 mesh. The selection of the mesh size here is mainly to further purify the water quality, so as to obtain the water quality that satisfies the breeding use.

The three-stage filter screen 163 and the four-stage filter screen 164 are all fixed on corresponding supports, and the support for fixing the three-stage filter screen 163 is fixedly connected with the support for fixing the four-stage filter screen 164, and is used for fixing The support of the four-stage filter screen 164 is also fixedly connected with the bracket arranged on the side of the four-stage filter screen 164 away from the three-stage filter screen 163 . Brackets and brackets can be made of steel frame structure. The brackets and brackets can make the filter screen be well fixed and supported in the hatching tank, so that the filter screen is not easy to be washed down or washed away by the water flow, and the structure is stable, which is beneficial to the filtration of hatching water. normal operation.

The length of the three-stage filter screen 163 and the four-stage filter screen 164 is 10-60 meters. The three-stage filter screen 163 and the four-stage filter screen 164 are very long, generally the length of a side of the hatching tank 120, and the use is generally 50-60 meters at most, and some adjustments can also be made according to the size of the hatching tank. The traditional filter screen is very short, the short one is less than 1 meter, and the long one is only a few meters. Due to the large water consumption during the breeding period, the short filter screen will accumulate more dirt per unit area due to the large water flow, and the filter screen will soon be blocked. , it is difficult to provide a large amount of breeding water in time. However, the length of the filter screen designed by the present invention is longer. When the same water consumption is used, the water flow per unit area is small, and the accumulated dirt is less, which is difficult to block. The water waves and spray can clean the stolen goods very well, which saves manpower, and at the same time can ensure sufficient breeding water.

There are several impeller-type aerators 170 arranged sequentially along the arrangement direction of the four-stage filter screens 164 . According to the size of the hatching tank and the filter screen, the number of impeller aerators 170 can be selected to achieve the purpose of filtering the water body and avoiding clogging.

The water outlet structure of the hatching tank is shown in Figure 7:

The water outlet structure of the hatching tank includes a vertical pipe segment 123a located in the hatching tank 120 and vertically arranged to the bottom of the hatching tank, and a metal mesh pipe 123c is sheathed and connected to the top of the vertical pipe segment 123a. The metal mesh pipe 123c here is a tube-shaped component made of metal mesh. In the process of flushing and flowing water, the water flow enters the hatching from the water injection pipe 122 upstream of the hatching pool 120, and then is discharged from the water outlet structure 123 downstream of the hatching pool. When changing the water, ensure that the water level in the hatching pool is higher than the vertical pipe section 123a and lower than The metal mesh pipe 123c has a simple water outlet structure. As an escape prevention device, the metal mesh pipe 123c can not only ensure a large amount of water, but also effectively block fish fry, and the water change process can be carried out quickly. Wherein the mesh size of metal mesh pipe 123c can be different according to different fishes, and the smallest mesh should ensure that fry will not flow out or be stuck.

Wherein, the pipe wall of the metal mesh pipe 123c is covered outside the pipe wall of the vertical pipe section 123a, and the metal mesh pipe 123c and the vertical pipe section 123a are fixed by a clamp. Easy to install, disassemble and wash.

A more specific solution is: the system also includes an active pipe section 123b located outside the hatching tank and communicated with the vertical pipe section 123a, the angle between the axial direction of the active pipe section 123b and the horizontal plane can be adjusted, and the water level in the active pipe section 123b The maximum vertical height is lower than the sum of the heights of the vertical pipe section 123a and the metal mesh pipe 123c. The height of the metal mesh pipe 123c determines the variation range of the water level in the hatching tank. The height of the general mesh is about 15cm, which can also be adjusted according to actual needs. The height of the metal mesh pipe 123c matches the height of the movable pipe section 123b outside the hatching tank. The maximum vertical height of the water level in the movable pipe section 123b outside the hatching pond 120 should be lower than the height of the vertical pipe section 123a plus the metal mesh pipe 123c, otherwise the water level in the hatching pond will be higher than the metal mesh pipe. The height of net pipe 123c, fry can directly flow out from the top of metal net pipe 123c. The movable pipe section 123b outside the hatching tank 120 can move, that is, the water level in the hatching tank can be adjusted by adjusting the angle between the movable pipe section 123b and the horizontal plane.

The metal mesh pipe 123c is made of stainless steel. This can ensure that the metal mesh pipe 123c will not rust due to long-term contact with water, prolonging the service life.

The vertical pipe section 123a communicates with the movable pipe section 123b through the horizontal pipe section 123d that runs through the hatching pond wall, and the movable pipe section 123b communicates with the horizontal pipe section 123d through the first right-angle pipe joint 123e, and the first right-angle pipe joint 123e rotates axially around the horizontal pipe section 123d and drives the movable pipe section 123b to rotate. That is, the movable pipe section 123b outside the hatching tank can rotate around the axial rotation of the horizontal pipe section 123d through the first right-angle pipe joint 123e. When the movable pipe section 123b is in an inclined state, the water level in the hatching pond can be adjusted.

The vertical pipe section 123a communicates with the horizontal pipe section 123d through a second right-angle pipe joint 123f. When the metal mesh pipe 123c is very dirty and needs to be cleaned or replaced, such a structure is convenient to take out the vertical pipe section 123a and the metal mesh pipe 123c connected with it, and simultaneously controls the inclination angle of the movable pipe section 123b outside the hatching tank. It will flow out and the fry will not escape.

Claims (9)

1. a method for hatching fertilized eggs in the early breeding process of largemouth bass, it is characterized in that: comprise building hatching greenhouse, the artificial fish nest that will be attached with fertilized eggs is put into the hatch pond (120) in hatching greenhouse, described A temperature control system is established in the hatching greenhouse to control the water temperature of the hatching pool at 23-28°C; The hatching greenhouse includes the hatching tank (120), and a greenhouse body composed of a steel structure support (131) above the hatching tank (120) and a light-transmitting film (132) covering the outside of the steel structure support (131) (130); the hatching pond (120) includes several hatching units (121) isolated from each other. 2. The hatching method according to claim 1, characterized in that: a matching water filtration system for hatching is set up upstream of the hatching pool, and a water outlet structure is set up downstream of the hatching pool. 3. The hatching method according to claim 1, characterized in that: said steel support (131) is provided with a slot (131a) for fixing the light-transmitting film, and said light-transmitting film passes through the S-shaped bead (131b) is pressed into the card slot (131a). 4. The hatching method according to claim 1 or 3, characterized in that: a light bulb (140) is hoisted above the hatching pool (120), and the display panel (150) of the temperature control system is suspended on the hatching pool (120). 120); the greenhouse is equipped with equipment for microporous oxygenation in the hatching pool (120); the greenhouse body (130) is covered with a sunshade net (133); the greenhouse body (130) There are windows (134) for user ventilation. 5. The hatching method according to claim 2, characterized in that: the hatching water filtration system includes a filter unit (160), and the filter unit (160) includes filter screen apertures that are sequentially intercepted along the water flow direction Gradually reduced primary filter (161), secondary filter (162), tertiary filter (163), fourth filter (164), located in the third filter (163) and/or fourth filter The side of the net (164) is provided with a water body agitation device, and the agitation device is an impeller type aerator (170). 6. The hatching method according to claim 5, characterized in that: the filter unit (160) also includes a water pump and a water suction pipe (165), and the water pump passes the water body from the reservoir (180) through the water suction pipe ( 165) into the hatching tank (120), the first-stage filter (161) and the second-stage filter (162) are respectively located at the water inlet and the water outlet of the water pump (165); the third-stage filter (163), the four-stage filter screen (164) is located in the hatching pond (120), and the described impeller type aerator (170) is away from the side of the three-stage filter screen (163) in the four-stage filter screen (164) layout. 7. The hatching method according to claim 5 or 6, characterized in that: the aperture of the secondary filter (162) is 100-180 mesh, and the secondary filter (162) is a mesh bag structure, and The mouth of the net pocket is set on the water outlet of the suction pipe (165); the aperture of the three-stage filter (163) is 180 mesh, and the aperture of the four-stage filter (164) is 200 mesh; the aperture of the three-stage filter (163) ) and the four-stage filter screen (164) are all fixed on the corresponding support, and the support for fixing the three-stage filter screen (163) is fixedly connected with the support for fixing the four-stage filter screen (164), and is used for fixing the four-stage filter screen (164). The support of the stage filter screen (164) is also fixedly connected with the bracket that is arranged on the four-stage filter screen (164) away from the three-stage filter screen (163) side; (164) length is 10-60 meter; Described impeller type aerator (170) has several, arranges successively along the arrangement direction of four-stage filtering net (164). 8. The hatching method according to claim 2, characterized in that: the water outlet structure includes a vertical pipe section (123a) located in the hatching tank and vertically arranged to the bottom of the hatching pool, and the top end of the vertical pipe section (123a) covers A metal mesh pipe (123c) is connected; the pipe wall of the metal mesh pipe (123c) is set on the outside of the pipe wall of the vertical pipe section (123a), and the metal mesh pipe (123c) and the vertical pipe section (123a) are fixed by a clamp; The water outlet structure also includes a movable pipe section (123b) connected to the vertical pipe section (123a) outside the hatching tank, the angle between the axial direction and the horizontal plane of the movable pipe section (123b) can be adjusted, and the movable pipe section ( The maximum vertical height of the water level in 123b) is lower than the sum of the heights of the vertical pipe section (123a) and the metal mesh pipe (123c). 9. The hatching method according to claim 8, characterized in that: the metal mesh pipe (123c) is made of stainless steel; the vertical pipe section (123a) and the movable pipe section (123b) pass through the wall of the hatching tank The horizontal pipe section (123d) communicates, and the movable pipe section (123b) communicates with the horizontal pipe section (123d) through the first right-angle pipe joint (123e), and the first right-angle pipe joint (123e) wraps around the horizontal pipe section (123d) The axial rotation drives the movable pipe section (123b) to rotate; the vertical pipe section (123a) communicates with the horizontal pipe section (123d) through the second right-angle pipe joint (123f).