CN114831059A - Method and device for early propagation and large-scale seedling culture of opsariichthys bidens - Google Patents

Abstract

The invention relates to the technical field of breeding and raising, and discloses an early propagation and large-scale breeding method of opsariichthys bidens, which comprises the following steps of, but not limited to, S1: placing a cultivation pool circulating system; s2: firstly, cleaning and disinfecting a culture pond, and adding disinfectant medicines including potassium permanganate, salt, chlorine dioxide and the like; s3: putting the artificially hatched fry into a culture pond when the fry has swimming capacity, and carrying out water quality culture and culture water environment regulation; s4: separate pool cultivation; s5: the method comprises the following steps of (1) storage management, namely adding medicines into workers for disinfection, and discharging pollution every day through a pollution discharge device; the sewage discharging device comprises a sewage accumulation assembly and a cultivating pool, wherein the sewage discharge assembly is arranged on one side of the sewage accumulation assembly, a sewage discharging pipeline is communicated with one side of the sewage discharge assembly, and a siphon is communicated with one end of the sewage discharging pipeline. The invention has the advantages of good pollution discharge performance and high survival rate.

Description

A kind of early propagation and large-scale seedling raising method and device of horse mouth fish

technical field

The invention relates to the technical field of seedling raising, in particular to a method and a device for early propagation and large-scale seedling raising of horsemouth.

Background technique

Horse mouth fish, commonly known as horse mouth, belongs to the order Cyprinidae, Cyprinidae, (Yudan) subfamily, and the genus Horse mouth fish. In my country, except for the Qinghai-Tibet Plateau, Xinjiang and Taiwan, it is from Hainan Island in the south to the eastern part of Heilongjiang in the north. It is distributed in all rivers, including the small and medium-sized tributaries in the middle and upper reaches of each water system in Zhejiang Province. Horsemouth not only has strong fecundity, fast growth, but also has delicious meat and is very popular among consumers. However, due to the excessive fishing intensity and changes in the ecological environment in recent years, the wild resources of horsemouth in many river basins have become very scarce.

Fish are ectothermic animals, and their reproductive activities are affected by both internal physiological regulation and external environmental factors. Water temperature is an important factor affecting the maturation and spawning of broodstock. Changes in water temperature can change the metabolic intensity of broodstock and accelerate or inhibit the development and maturation of gonads. In artificial reproduction of fish, temperature control is often used to achieve early reproduction. At the same time, good water quality is the premise and foundation for the realization of large-scale fish breeding. If the water for aquaculture is polluted, it will not only affect the normal growth of fish, but also have an irreversible impact on the reproductive activities of fish. In the existing artificial breeding and production of horsemouth, it is mainly carried out in outdoor earth ponds. The water quality is often easily polluted due to the poor sewage discharge performance of earth ponds, and the water temperature is also uncontrollable because it is outdoors, resulting in high mortality of broodstock and high mortality. Gonadal growth retardation, low hatching rate of fertilized eggs, late emergence of seedlings and low survival rate are not conducive to the realization of early emergence and large-scale nursery.

SUMMARY OF THE INVENTION

The invention provides a method and a device for early propagation and large-scale seedling raising of equid Gonadal growth retardation, low hatching rate of fertilized eggs, late emergence of seedlings and low survival rate.

The present invention provides the following technical solutions: a method for early propagation and large-scale seedling raising of horsemouth, including but not limited to the following steps,

S1: Place the cultivating tank circulation system. Under the artificial breeding environment, the inlet end of the cultivation pond is connected to the reservoir, the outlet end of the cultivating pond is connected to the purification pond, and the purification pond is connected to the reservoir through the water pump. The cultivation pond and the purifying pond It forms a circulation system with the reservoir, the depth of the pool is 1-1.5m, the wall of the pool is smooth, and the water intake and drainage can be adjusted arbitrarily;

S2: Clean and disinfect the cultivation pool first, and add disinfectant drugs, including potassium permanganate, table salt, chlorine dioxide, etc.;

S3: Put the artificially hatched fry into the cultivation pond when they start to have swimming ability, carry out water quality cultivation and aquaculture water environment regulation, and add constant temperature equipment and oxygen supply equipment for controlling water temperature and oxygenation;

S4: Separate pools for storage, and continue to replace all or part of the water with fish mucus with clean water to prevent the mucus from corrupting the water quality during the process of dividing the pools;

S5: Storage management, disinfection by adding medicines by staff, and daily sewage discharge through sewage discharge devices, while continuing to control temperature and increase oxygen;

S6: Observation before induction of labor, check the gonad development of equine fish monthly, puncture the abdomen of the broodstock with an egg digger, and dig out the gonad tissue for section observation;

S7: induced labor, using fish chorionic gonadotropin (HCG), dione (DOM), and luteinizing hormone-releasing hormone analog (LRH-A2) to induce labor;

S8: Incubate, incubate, observe embryo development during incubation, and maintain filter equipment regularly.

As an optional solution of the method and device for early propagation and large-scale seedling raising of horsemouth according to the present invention, wherein: the sewage discharge device includes a fouling assembly and a cultivation tank, and the sewage accumulating assembly is placed in the On the inner bottom surface of the culturing pond, one side of the sewage accumulating component is provided with a sewage assembly, one side of the sewage assembly is connected with a sewage pipe, and one end of the sewage pipe is connected with a siphon, and the siphon is provided with a one-way valve. .

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth according to the present invention and the device thereof, step S1 also includes preparing a lifting net, and the lifting net should grow a few mosses to keep the lifting net smooth, The storage tank can be a rectangular or oval cement floor, with an area of 30~50m ² , a pool depth of 1~1.5m, smooth walls, and adjustable water intake and drainage.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth and its device according to the present invention, wherein: the sewage assembly includes a sewage tank and a sewage pipeline, and a turbine is arranged inside the sewage tank. A fan and a sponge screen, two groups of the sponge screen are installed on one of the outer sides of the turbo fan.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth according to the present invention and the device thereof, wherein: the inside of the cultivation tank is provided with a filter screen with adjustable height, and the filter screen is provided with a height-adjustable filter screen. The net is placed inside the culture pond and can be adjusted to be parallel to the water surface.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth according to the present invention and the device thereof, wherein: the fouling assembly includes a baffle plate, and the baffle plate is arranged obliquely, and the two groups of A sewage outlet is arranged in the middle of the baffle plate, and the siphon pipe extends through the sewage discharge pipeline to the inside of the sewage outlet.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth according to the present invention, and a device thereof, wherein: a circulating pump and a reservoir are respectively provided on the outside of the cultivation tank, and the cultivation tank is provided with a circulating pump and a storage tank respectively. There is a first water delivery pipe connected to the inside of the pump, a solenoid valve is arranged on the first water delivery pipe, one end of the first water delivery pipe is connected with the water outlet end of the circulating pump, and the water inlet end of the circulating pump passes through the second water delivery pipe Connected to the interior of the reservoir.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth according to the present invention and the device thereof, wherein: the inner bottom of the cultivation tank is equidistantly installed with several compression springs, and several Filter rods are installed on the upper part of the compression spring.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth according to the present invention and the device thereof, wherein: the filter rod comprises a first tube body and a second tube body set inside the first tube body. A pipe body, wherein a ceramic filter element is arranged inside the second pipe body.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth and its device according to the present invention, one side of the filter screen is provided with a mounting frame, and one side of the mounting frame is provided with a mounting frame. A lifting screw is fixedly connected, and one side of the lifting screw is provided with an adjustable manual crank.

As an optional solution of the method for early propagation and large-scale seedling raising of horsemouth according to the present invention and its device, wherein: one end of the filter screen away from the mounting frame is fixedly installed with a sliding block, and the cultivating tank is The inner wall of the device is provided with a sliding rail matched with a sliding block, and the sliding block is slidably connected to the inside of the sliding rail.

The present invention has the following beneficial effects:

1. The early propagation and large-scale seedling raising method and device of this kind of horse mouth fish, through 8 steps, the horse mouth fish nursery is raised and spawned; The siphon principle is used to accumulate and discharge wastes such as feed residues and feces at the bottom of the cultivation tank;

2. The early propagation and large-scale seedling raising method and device of the horsemouth fish are blown away by the turbo fan in the sewage discharge tank, and then the wastes such as feed residue and feces flowing into the sewage pipe are blown away, and then the sponge screen is adsorbed, and then the waste is absorbed by the sponge screen. When replacing and maintaining, you only need to block the sewage outlet, and then open the sewage box to clean or replace the sponge screen;

3. The early propagation and large-scale seedling raising method and device of this kind of horse mouth fish, the water quality in the cultivation tank is biologically and physically filtered through the liftable filter screen and the filter rod in the cultivation tank, which improves the water quality and indirectly improves the water quality in the cultivation tank. the survival rate of horsemouth.

Description of drawings

FIG. 1 is a schematic diagram of the steps of the method of the present invention.

FIG. 2 is a schematic plan view of the structure of the present invention.

FIG. 3 is an enlarged schematic view of the structure A in FIG. 2 of the present invention.

Figure 4 is a schematic cross-sectional view of the filter rod structure of the present invention.

In the figure: 1. dirt accumulation assembly; 101, baffle plate; 2, sewage assembly; 201, sewage pipe; 202, sewage outlet; 3, siphon; 4, one-way valve; 5, sponge screen; 6, sewage tank; 7. Sewage pipe; 8. Turbo fan; 9. Cultivation pool; 10. Filter screen; 11. Circulating pump; 12. Reservoir; 13. First water pipe; 14. Second water pipe; 15. Solenoid valve ; 16, compression spring; 17, filter rod; 18, first pipe body; 19, second pipe body; 20, ceramic filter element; 21, mounting frame; 22, lifting screw; 23, manual crank; 24, slide rail ; 25. Slider.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

Please refer to Figures 1-4, a method for early propagation and large-scale breeding of horsemouth and its device, including but not limited to the following steps,

S1: Place the cultivating tank circulation system. Under the artificial breeding environment, the inlet end of the cultivation pond is connected to the reservoir, the outlet end of the cultivating pond is connected to the purification pond, and the purification pond is connected to the reservoir through the water pump. The cultivation pond and the purifying pond It forms a circulation system with the reservoir, the depth of the pool is 1-1.5m, the wall of the pool is smooth, and the water intake and drainage can be adjusted arbitrarily;

S2: Clean and disinfect the cultivation pool first, and add disinfectant drugs, including potassium permanganate, table salt, chlorine dioxide, etc.;

Water quality cultivation and aquaculture water environment regulation, adding constant temperature equipment and oxygen supply equipment, and controlling the water temperature between 23 °C and 26 °C. During the storage period, the dissolved oxygen content of the pond water should reach more than 7 mg/L. When the dissolved oxygen is sufficient, the water temperature is relatively high and the organic matter content few;

S3: Put the artificially hatched fry into the breeding tank when they begin to have swimming ability; select individuals with good development, robust fish body, agile swimming, and no damage to the body surface for storage. The full length, body length, body weight, male and female, and gonad development of the broodstock should be measured before they are placed in the pond. If the broodstock is found to have trauma, medication should be taken in time. Well water, reservoir water, and mountain stream water can be used as the water source for storage. Mouthfish is a wild fish in streams, and it needs running water or circulating water in the artificial breeding environment, and fresh water is regularly injected;

S4: Separate ponds for storage, and continue to replace all or part of the water with fish mucus with clean water to avoid excessive mucus from corrupting the water quality during the breeding process. Use the method of lifting nets and full-pond fishing to select from the breeding ponds The broodstock with robust physique, larger size, reaching sexual maturity or close to sexual maturity, must be cultivated in a special pool in the broodstock breeding tank;

S5: Storage management, disinfection by adding medicines by staff, and daily sewage discharge through sewage discharge devices, while continuing to control temperature and increase oxygen. The storage tank should be disinfected with chlorine dioxide or other disinfecting drugs before releasing the fish, and the storage tank should be inspected once a day in the morning, noon and evening (the activity status of the broodstock, water temperature, water quality, feeding, etc.) to be resolved in time. Regularly clean up the pollutants in the storage tank to keep the water body clean. Continue to use constant temperature equipment and oxygen supply equipment, control the water temperature between 24 °C and 26 °C, and the dissolved oxygen in the pool water to reach more than 7 mg/L, to promote the development of broodstock gonads. Check the gonad development status of the broodstock in the storage tank on a monthly basis, and determine their full length, body length, body weight and other traits;

S6: Observation before induction of labor, check the gonad development status of the broodstock in the storage tank on a monthly basis, and determine their full length, body length, body weight and other traits. The abdomen of the broodstock was punctured with an ovipositor, and the gonadal tissue was excavated, fixed with 10% formalin solution, and sliced for observation. Female fish should also measure the egg weight and egg diameter, and observe the shape and color of the eggs. 3.3 The breeding cycle is one year, generally from May and June of the current year to May and June of the following year. After breeding, the gonads of the broodstock have matured, and the tissue sections can be placed under a microscope for observation to confirm that the ovary of the female fish has developed to the IV stage, and the sperm of the male fish has vigorous movement, which can be used for artificial reproduction.

The first step of broodstock inspection: male and female identification can be done by combining external morphological observation and gonad histological examination. The female fish is relatively small, with no light blue vertical stripes on the sides of the body, and the abdomen is swollen and fluffy during the reproductive season. The male fish is relatively large, with light blue vertical stripes on the side of the body, obvious bead stars on the head, snout and anal fin, and milky white semen flowing out of the abdomen during the reproductive season. .

Step 2: The parents are intensively cultivated in February of each year. At the beginning, they are fed with fresh fly maggots or Tenebrio molitor at 1.5% of the fish weight. to about 3%.

Step 3: Check the maturity of the broodstock The maturity of the broodstock can be checked one by one according to the following requirements. The male can express milky white semen as a sign of sexual maturity. The male broodstock turns the abdomen upwards and gently presses along the sides of the abdomen from the chest to the anus. If there is white semen flowing out and it can quickly disperse in the water, it is a mature male broodstock, which can be used as a broodstock for induction of labor. The outflow of white semen indicates that the male broodstock is immature. If there is a small amount of white semen flowing out, but it is not easy to spread in the water, the male broodstock is not mature enough and cannot be used. Females are marked by ovarian development to stage IV as a sign of maturity. Turn the abdomen of the broodstock upwards, first visually check the abdominal distension of the female broodstock, and touch the sides of the abdomen of the broodstock to see if the abdomen is soft. , and then insert the ovipositor into the ovary in the abdominal cavity from the genital hole of the female broodstock, turn the ovipositor, take out a small amount of eggs, pour the alcohol into the beaker, and stir the retrieved eggs in alcohol. The egg falls out from the ovipositor and the egg is round. Touch the egg with the ovipositor, and the egg particles will disperse. The egg has entered the IV stage and can be used to induce broodstock. If the egg is stirred with the egg retrieval device, the egg particles will not Spreading out or very little, saying the egg is not mature enough to induce labor. Ovarian broodstock developed to the middle and end of IV stage should be selected for induction of labor.

S7, oxytocin, oxytocin broodstock using fish chorionic gonadotropin (HCG), dione (DOM), luteinizing hormone-releasing hormone analog (LRH-A2). The dosage of oxytocin should meet the following requirements: per kilogram of parental HCG700~1000iu, DOM3mg, LRH-A2.3.5~4ug with 0.65% normal saline, thoracic injection, 0.2ml per female fish, 0.1ml per male fish.

S8: Incubation, that is, according to different hatching tools and their performance, put a suitable number of fish eggs for hatching. Generally, one hatching bucket can put 100 groups of fertilized eggs of fish. Send a special person to check the condition of the fish eggs regularly and adjust the water flow of the appropriate size, that is, when the hatching begins, the water flow can make the fish eggs rush up, roll slowly, and distribute evenly; It is easy to sink and accumulate, and the flow rate should be appropriately increased, but it should not be too large to prevent the fish body from being washed; when the fry can swim freely in the water and their mobility is enhanced, the water flow speed should be reduced to avoid the consumption of physique and physical strength. Regularly wash the filter equipment to keep the water flow smooth, so that the water in and out are balanced. Frequent observation of hatching dynamics, embryonic development process and changes in environmental conditions, timely statistics of fertilization rate, and mastery of seedling emergence standards and time. In particular, the management should be strengthened during the embryo emergence period until the hatching is successful.

The sewage discharge device includes a sewage accumulation assembly 1 and a cultivation pool 9. The sewage accumulation assembly 1 is placed on the inner bottom surface of the cultivation pond. One side of the sewage accumulation assembly 1 is provided with a sewage discharge assembly 2, and one side of the sewage discharge assembly 2 is connected with a sewage discharge pipeline 201. One end of the sewage pipe 201 is communicated with a siphon 3, and the siphon 3 is provided with a one-way valve 4;

Wherein: the dirt accumulation assembly 1 includes baffles 101 , the baffles 101 are inclined, and a sewage outlet 202 is arranged in the middle of the two sets of baffles 101 .

Working principle: The principle of the siphon is the pressure of the liquid and the atmospheric pressure. When the siphon is filled with liquid, both ends are affected by the atmospheric pressure and the pressure of the liquid in the pipe. Due to the small height difference, both ends are subject to the same atmospheric pressure, but the pressure of the liquid in the pipe When the inequality is reached, the column degree of the liquid at the low end is large, the pressure of the liquid in the tube is large, and the direction is from the high end to the low end, so the liquid in the tube flows from the high end to the low end, and the atmospheric pressure will continuously press the liquid into the tube, which will form a continuous liquid flow .

Wherein: the sewage assembly 2 includes a sewage box 6 and a sewage pipe 7 . The inside of the sewage box 6 is provided with a turbo fan 8 and a sponge screen 5 , and two groups of sponge screens 5 are installed on the outer side of the turbo fan 8 .

Through the siphon principle, the garbage and feed at the bottom of the cultivation tank 9 are left, and the waste is sucked into the sewage pipe 7 together. The inclined baffle 101 facilitates the accumulation of garbage in the sewage tank 6 more quickly, and the suction of the siphon 3, the water flow, The slow flow of water drives the turbo fan 8 to rotate, and the turbo fan 8 in the sewage tank 6 blows away the feed residues, feces and other garbage that flow into the sewage pipe 7, and then the sponge screen 5 is adsorbed. It is necessary to block the sewage outlet 202, and then open the sewage tank 6 to clean or replace the sponge screen;

Wherein: the outside of the cultivation pool 9 is respectively provided with a circulating pump 11 and a reservoir 12, the interior of the cultivation pool 9 is communicated with a first water pipe 13, the first water pipe 13 is provided with a solenoid valve 15, and the first water pipe 13 One end is connected with the outlet end of the circulating pump 11, and the water inlet end of the circulating pump 11 is communicated with the interior of the reservoir 12 through the second water delivery pipe 14, which facilitates the circulation of new water and keeps the water quality in good condition.

Wherein: a plurality of compression springs 16 are installed at the inner bottom of the cultivation pool 9 at equal distances, and filter rods 17 are installed on the upper sections of the plurality of compression springs 16, and the filter rods 17 include a first pipe body 18 and are sleeved on the first pipe body 18. The inner second pipe body 19 is provided with a ceramic filter element 20 inside the second pipe body 19. The filter element adopts ceramic biological filtration, which is beneficial to cultivate beneficial bacteria and decompose harmful elements through bacteria. The function of the compression spring 16 is to obtain suction through the siphon 3 so that the The vibration of the filter rod 17 makes the area in contact with the water larger, which facilitates filtration of more water areas.

Wherein: the inside of the cultivation pool 9 is provided with a height-adjustable filter screen 10, and the filter screen 10 is placed inside the cultivation pool and can be adjusted to be parallel to the water surface.

One side of the filter screen 10 is provided with a mounting frame 21, one side of the mounting frame 21 is fixedly connected with a lifting screw 22, and one side of the lifting screw 22 is provided with an adjustable manual crank 23; the manual crank 23 is adjusted by the staff Drive the lifting screw 22 to move up and down, and then replace or clean the filter screen, and the uneaten fish food, algae garbage and some organic matter floating on the water surface are adsorbed on the filter screen screen 10, and then lift and move away from the water surface, and the water quality can be adjusted. Repeated adsorption and cleaning, the prior art has many lifts and drives, which will not be described and limited here. One end of the filter screen 10 away from the mounting frame 21 is fixedly installed with a sliding block 25, and the inner wall of the cultivation pool 9 is provided with a sliding block 25. The slide rail 24, the sliding block 25 is slidably connected to the inside of the slide rail 24.

Outlet effect: Through the control of water environment, the survival rate of broodstock is over 80%, the gonads of broodstock are well developed in late March, and the artificial induction rate is about 85%. In mid-May, the 3-4cm full-length horsemouth inch slices will be sold for proofing. The specification is 5270 tails/kg, with a total of 590,000 tails, and the survival rate reaches 65%.

Comparative Example 1

With Embodiment 1, the difference is that S1 is not included to place the cultivation tank circulation system and S2 is to carry out cleaning and disinfection treatment to the cultivation tank, and the rest are equivalent to Embodiment 1. This results in a significant drop in seedling survival, which is less than 45%.

Comparative Example 2

It is the same as Example 1, except that the temperature control treatment in S3 and S5 is not included, and the rest are identical to Example 1. This will lead to frequent outbreaks of saprolegnia in broodstock in spring and autumn (water temperature at 15-20°C), and the survival rate is greatly reduced, only about 50%; Artificial induction of labor can be carried out only after 1 month, and the induction rate is only about 65%.

Comparative Example 3

The blowdown device of Example 1 was not included; the rest were identical to Example 1. This will lead to an increase in broodstock diseases, and the survival rate is lower than 60%; the growth rate of the fry is reduced, and the size of the seed is only 2/3 of that of Example 1 under the same breeding cycle as Example 1, and the survival rate is lower than 48%.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A method for early breeding and large-scale breeding of opsariichthys bidens comprises but is not limited to the following steps,

s1: placing a cultivation pool circulating system, wherein under the condition of artificial cultivation environment, the water inlet end of the cultivation pool is connected with a water storage pool, the water outlet end of the cultivation pool is connected with a purification pool, the purification pool is connected with the water storage pool through a water pump, and the cultivation pool, the purification pool and the water storage pool form a circulating system;

s2: firstly, cleaning and disinfecting a culture pond, and adding disinfectant, including potassium permanganate, salt and/or chlorine dioxide;

s3: putting the artificially hatched fries into a culture pond when the fries begin to have swimming capability, regulating and controlling the water environment of water quality culture and breeding, and adding constant temperature equipment and oxygen supply equipment for controlling the water temperature and increasing oxygen;

s4: storing and culturing in separate ponds, and continuously replacing all or part of water with fish mucus by using clear water to avoid spoiling the water quality of the mucus in the separate pond process;

s5: performing storage management, namely adding medicines for disinfection by workers, discharging pollution every day by a pollution discharge device, and simultaneously continuously controlling temperature and increasing oxygen;

s6: observing before induced spawning, checking the gonad development condition of the opsariichthys bidens monthly, puncturing the abdomen of the parent fish by using an egg digging device, digging out gonad tissues and carrying out slicing observation;

s7: inducing parturition by using fish chorionic gonadotropin (HCG), Diosdone (DOM) and luteinizing hormone releasing hormone analogues;

s8: hatching, observing the development condition of the embryo in the hatching process, and regularly maintaining the filtering equipment.

2. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 1, wherein the method comprises the following steps: the blowdown apparatus comprises a blowdown assembly (1) and a culture pond (9), wherein the blowdown assembly (1) is placed on the inner bottom surface of the culture pond, a blowdown assembly (2) is arranged on one side of the blowdown assembly (1), a blowdown pipeline (201) is communicated with one side of the blowdown assembly (2), a siphon (3) is communicated with one end of the blowdown pipeline (201), and a one-way valve (4) is arranged on the siphon (3).

3. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 1, wherein the method comprises the following steps: blowdown subassembly (2) are including blow off case (6) and sewage pipes (7), the inside of blow off case (6) is equipped with turbofan (8) and sponge screen cloth (5), and is two sets of sponge screen cloth (5) are installed in the side in the outside of turbofan (8).

4. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 1, wherein the method comprises the following steps: the height-adjustable filter screen (10) is arranged in the cultivation pond (9), and the filter screen (10) is placed in the cultivation pond and can be adjusted to be parallel to the water level.

5. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 2, wherein: long-pending dirty subassembly (1) is including baffle (101), baffle (101) are the slope setting, and are two sets of the centre of baffle (101) is equipped with drain (202), siphon (3) run through inside that sewage pipes (7) extend to drain (202).

6. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 2, wherein: cultivate the outside in pond (9) and be equipped with circulating pump (11) and cistern (12) respectively, the inside intercommunication of cultivating pond (9) has first raceway (13), be equipped with solenoid valve (15) on first raceway (13), the one end of first raceway (13) and the play water end intercommunication of circulating pump (11), the end of intaking of circulating pump (11) is through second raceway (14) and the inside intercommunication of cistern (12).

7. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 2, wherein: cultivate interior bottom equidistance in pond (9) and install a plurality of compression spring (16), and a plurality of filter rod (17) are all installed to the last case of compression spring (16).

8. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 2, wherein: the filter rod (17) comprises a first pipe body (18) and a second pipe body (19) sleeved inside the first pipe body (18), and a ceramic filter element (20) is arranged inside the second pipe body (19).

9. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 2, wherein: one side of filter screen (10) is provided with mounting bracket (21), one side fixedly connected with lifting screw (22) of mounting bracket (21), one side of lifting screw (22) is equipped with adjustable artifical crank (23).

10. The method and the device for early propagation and large-scale breeding of the opsariichthys bidens according to claim 2, wherein: one end fixed mounting that mounting bracket (21) were kept away from in filter screen (10) has sliding block (25), the inner wall of breeding pond (9) is provided with slide rail (24) with sliding block (25) complex, sliding block (25) sliding connection is in the inside of slide rail (24).

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