Large-scale breeding system and method of Ussuri whitefish seedlings

Abstract

A large-scale breeding system and breeding method for Ussuri whitefish seedlings. Generally, the survival rate of fish in nature is less than 10%. The present invention comprises: the large-scale breeding system for Ussuri whitefish seedlings is composed of a group of breeding and cultivation systems arranged in parallel, the breeding and cultivation system comprises a floating ball biological filter (1), an oxygenation aeration separator (2), a seedling breeding device (3) and a seedling cultivation device (4), the seedling breeding device comprises a shell (8), a vertically arranged rotating shaft (14) is arranged in the shell, a water distribution plate (6) is arranged at the lower end of the shell, four groups of rotating frames (17) are fixed on the circumference of the rotating shaft, each group of the rotating frames is composed of a group of fixed plates (18) arranged from top to bottom, and an egg-carrying plate (20) is arranged between two adjacent fixed plates of the rotating frame. The present invention is used for large-scale breeding of Ussuri whitefish seedlings.

Description

Technical field:

[0002] The invention relates to a large-scale breeding system and method for Ussuri whitefish fry. Background technology:

[0004] Ussuri whitefish is a migratory fish that travels back and forth between the sea and rivers, and may do so several times a year. However, during the spawning period in November each year, they basically stay in the deep river, especially when the river surface has just frozen, and reproduce under the thin ice. Because the eggs are sticky, the parents lay their eggs on water plants or other attachments. The hatching characteristics of fertilized eggs require swinging attachments, micro-flowing water, low temperature and high dissolved oxygen. The water temperature under the ice is generally 2-4℃. Due to the ice, the water flow rate under the ice is weakened, but the dissolved oxygen content is higher under low temperature conditions. Usually, the reproduction survival rate of fish in nature is less than 10%. Summary of the invention:

[0006] The invention aims to provide a large-scale breeding system and method for Ussuri whitefish seedlings.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A large-scale breeding system for Ussuri whitefish seedlings, the large-scale breeding system for Ussuri whitefish seedlings is composed of a group of breeding and cultivation systems arranged in parallel, the breeding and cultivation system includes a floating ball type biological filter, an oxygenated aeration separator, a seedling breeding device and a seedling cultivation device;

[0009] The seedling breeding device includes a shell, a vertically arranged rotating shaft is arranged in the shell, a water distribution tray is arranged at the lower end of the shell, four groups of rotating frames are fixed on the circumference of the rotating shaft, each group of the rotating frames is composed of a group of fixed plates arranged from top to bottom, and an egg-carrying plate is arranged between two adjacent fixed plates of the rotating frame.

[0010] The large-scale breeding system for Ussuri whitefish fry, the egg-carrying plate comprises an outer frame and a grid plate fixed in the outer frame.

[0011] In the large-scale breeding system for Ussuri whitefish fry, the mesh plates have square holes with a diameter of 1 mm x 1 mm.

[0012] In the large-scale breeding system of Ussuri whitefish seedlings, a large gear is fixed on the upper part of the rotating shaft, the large gear is meshed with the small gear of the speed regulating motor, and the speed regulating motor is fixed on the upper cover of the upper part of the shell.

[0013] In the large-scale breeding system for Ussuri whitefish fry, the diameter of the water diversion holes on the water diversion plate is 8 mm.

[0014] In the large-scale breeding system for Ussuri whitefish fry, an outer sleeve is fixed to the upper outer part of the shell, a group of evenly arranged water outlets are arranged on the circumference of the upper part of the shell, and a drainage port is provided on the outer sleeve.

[0015] The large-scale breeding system for Ussuri whitefish fry has a water inlet at the lower part of the shell.

[0016] A breeding method for a large-scale breeding system of Ussuri whitefish seedlings, the breeding method comprising the following steps: harmful substances such as excrement, ammonia nitrogen, etc. generated during the breeding process of fish eggs in a seedling breeding device and the culturing process in a seedling culture device flow into a floating ball type biological filter, and after separation and degradation by the floating ball type biological filter, the circulating water body index meets the requirements of fish egg hatching and seedling growth, and the water temperature of the circulating water body is kept constant at 2-4°C;

[0017] The circulating water after separation and aeration is aerated by the aeration separator to remove harmful gases generated during the biological filtration process, so that the oxygen content in the water body reaches more than 8mg / L;

[0018] The water after oxygenation and aeration enters the seedling culture device through the water inlet at the bottom, passes through the water distribution plate, and then enters the shell. The rotating frame rotates at a speed of 30s / circle. The water entering the shell forms convection with the fish eggs stuck on the egg-carrying plate. After the fish eggs are bred, they are discharged through the drain port with the water flow and flow into the seedling culture device for cultivation.

[0019] Beneficial effects:

[0020] 1. The rotating frame of the present invention is rotating, and all fertilized eggs are adhered to the egg-carrying plate. The water temperature and dissolved oxygen are regulated by the control system. The water temperature is constant at 2-4°C, and the dissolved oxygen is controlled at more than 8 mg / liter. There is water flowing upward at the bottom of the incubator to simulate the convection above the thermocline in the river. The rotating frame simulates the swing of the fish egg attachment in nature to avoid the dirt and dead eggs sticking to each other to breed fungi, and at the same time improve the hatching speed.

[0021] The invention can improve the breeding success rate to 80%, and effectively solves the problem of seedling propagation.

[0022] The water temperature and dissolved oxygen of the invention are regulated by the control system, the water temperature is constant at 2-4°C, the dissolved oxygen is controlled at more than 8 mg / liter, the water temperature is low, and the fish eggs have enough oxygen, which can prevent the fertilized eggs from dying due to lack of oxygen. Description of the drawings:

[0024] Attached Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Attached Figure 2 It is a schematic diagram of the structure of the seedling breeding device;

[0026] Attached Figure 3 It is a schematic diagram of the structure of the egg-carrying plate;

[0027] In the figure: 1. Float-type biological filter; 2. Oxygen-enhancing aeration separator; 3. Seedling breeding device; 4. Seedling cultivation device; 5. Water inlet; 6. Water distribution plate; 7. Step trough; 8. Shell; 9. Outer ring; 10. Upper cover; 11. Speed ​​regulating motor; 12. Small gear; 13. Large gear; 14. Rotating shaft; 15. Water outlet; 16. Drainage outlet; 17. Rotating frame; 18. Fixed plate; 19. Water distribution hole; 20. Egg-carrying plate; 21. Outer frame; 22. Grid plate. Specific implementation method:

[0029] Embodiment 1:

[0030] A large-scale breeding system for Ussuri whitefish seedlings, the large-scale breeding system for Ussuri whitefish seedlings is composed of a group of breeding and cultivation systems arranged in parallel, the breeding and cultivation system comprises a floating ball type biological filter 1, an oxygenated aeration separator 2, a seedling breeding device 3 and a seedling cultivation device 4;

[0031] The seedling breeding device includes a shell 8, a vertically arranged rotating shaft 14 is provided in the shell, a water distribution tray 6 is provided at the lower end of the shell, four groups of rotating frames 17 are fixed on the circumference of the rotating shaft, each group of the rotating frames is composed of a group of fixed plates 18 arranged from top to bottom, and an egg-carrying plate 20 is provided between two adjacent fixed plates of the rotating frame.

[0032] Embodiment 2:

[0033] According to the large-scale breeding system of Ussuri whitefish seedlings described in Example 1, the egg-carrying plate includes an outer frame 21 and a grid plate 22 fixed in the outer frame.

[0034] Embodiment 3:

[0035] According to the large-scale breeding system for Ussuri whitefish seedlings described in Example 1 or 2, the aperture of the mesh plate is a square hole of 1 mm x 1 mm.

[0036] Embodiment 4:

[0037] According to the large-scale breeding system of Ussuri whitefish seedlings described in Example 1, 2 or 3, a large gear 13 is fixed on the upper part of the rotating shaft, and the large gear is meshed with the small gear 12 of the speed regulating motor 11, and the speed regulating motor is fixed on the upper cover 10 on the upper part of the shell.

[0038] Embodiment 5:

[0039] According to the large-scale breeding system for Ussuri whitefish fry described in Example 1, 2, 3 or 4, the diameter of the water diversion holes on the water diversion plate is 8 mm.

[0040] Embodiment 6:

[0041] According to the large-scale breeding system of Ussuri whitefish seedlings described in Example 1, 2, 3, 4 or 5, an outer sleeve ring 9 is fixed to the upper outer portion of the shell, a group of evenly arranged water outlets 15 are provided on the circumference of the upper portion of the shell, and a drainage port 16 is provided on the outer sleeve ring.

[0042] Embodiment 7:

[0043] According to the large-scale breeding system for Ussuri whitefish fry described in Example 1 or 2 or 3 or 4 or 5 or 6, the lower part of the shell has a water inlet 5.

[0044] Embodiment 8:

[0045] A breeding method for a large-scale breeding system of Ussuri whitefish seedlings, the breeding method comprising the following steps: harmful substances such as excrement, ammonia nitrogen, etc. generated during the breeding process of fish eggs in a seedling breeding device and the culturing process in a seedling culture device flow into a floating ball type biological filter, and after separation and degradation by the floating ball type biological filter, the circulating water body index meets the requirements of fish egg hatching and seedling growth, and the water temperature of the circulating water body is kept constant at 2-4°C;

[0046] The circulating water after separation and aeration is aerated by the aeration separator to remove harmful gases generated during the biological filtration process, so that the oxygen content in the water body reaches more than 8mg / L;

[0047] The water after oxygenation and aeration enters the seedling culture device through the water inlet at the bottom, passes through the water distribution plate, and then enters the shell. The rotating frame rotates at a speed of 30s / circle. The water entering the shell forms convection with the fish eggs attached to the egg-carrying plate. After the fish eggs are bred, they are discharged through the drain port with the water flow and flow into the seedling culture device for cultivation.

[0048] System comparison test:

[0049] (1) The system does not perform temperature control;

[0050] If the system is not temperature-controlled, the water temperature will reach 8°C even in the indoor hatchery in the winter of November and December, which is much higher than the natural incubation temperature. This will cause a large number of fry to become deformed and die, with a deformity rate as high as 70% and a survival rate of only about 20%.

[0051] (2) The system does not supply pure oxygen water;

[0052] If the system does not supply pure oxygen water, but only provides ordinary underground static water for incubation, the water temperature will be high and the dissolved oxygen will be low. Low dissolved oxygen will cause serious stacking of fertilized eggs to die of lack of oxygen, and the mortality rate is usually as high as 40%.

[0053] (3) If the system does not carry out bottom micro-flow convection;

[0054] If the system does not have a bottom-up micro-flow design, the water in the hatching chamber will be still water, which may cause hypoxia. The hatched fry will not be able to flow into the culture tank next to it. Due to the long hatching period, the fry membrane breaking time lasts about 10 days. The early fry will be trapped in the hatching chamber, which is not conducive to opening and domestication in the first place. At the same time, the hatching mortality rate is as high as 30%.

[0055] (4) If the system performs hatching rack rotation processing;

[0056] If the system does not perform ecological simulation of fertilized egg attachment swing, it will be difficult for water to flow through all the gaps between the eggs, leading to bacterial growth, and it will also be difficult for regular disinfection and drug immersion into the eggs. Through swinging, the eggs that stick together can shake horizontally, making it easier for water and drugs to pass through, thereby improving the hatching rate. In a hatching chamber without swinging, the mortality rate will reach 30%.

Claims

1. A large-scale breeding system for Ussuri whitefish fry, characterized by: The large-scale breeding system of Ussuri whitefish seedlings is composed of a group of breeding and cultivation systems arranged in parallel, wherein the breeding and cultivation system includes a floating ball biological filter, an oxygen-enhancing aeration separator, a seedling breeding device and a seedling cultivation device; The seedling breeding device comprises a shell, a vertically arranged rotating shaft is arranged in the shell, a water distribution plate is arranged at the lower end of the shell, four groups of rotating frames are fixed on the circumference of the rotating shaft, each group of rotating frames is composed of a group of fixed plates arranged from top to bottom, and an egg-carrying plate is arranged between two adjacent fixed plates of the rotating frame; An outer sleeve is fixed to the upper outer part of the shell, a group of evenly arranged water outlets are arranged on the circumference of the upper part of the shell, and a drain port is arranged on the outer sleeve; The lower part of the shell body is provided with a water inlet; The breeding method of the breeding and cultivation system comprises the following steps: harmful substances generated during the breeding process of fish eggs in the seedling breeding device and the cultivation process of the seedling cultivation device flow into the floating ball type biological filter, and after separation and degradation by the floating ball type biological filter, the circulating water body index reaches the requirements of fish egg hatching and seedling growth, and the water temperature of the circulating water body is kept constant at 2-4°C; The circulating water after separation and degradation is aerated by the aeration separator to remove harmful gases generated during the biological filtration process, so that the oxygen content in the water body reaches more than 8mg / L; The water after oxygenation and aeration enters through the water inlet at the bottom of the seedling culture device and enters the shell after being separated by the water distribution plate. The rotating frame rotates at a speed of 30s / circle. The water entering the shell forms convection with the fish eggs attached to the egg-carrying plate. After the fish eggs are bred, they are discharged through the drain port with the water flow and flow into the seedling culture device for cultivation.

2. The large-scale breeding system of Ussuri whitefish seedlings according to claim 1 is characterized in that: The egg-carrying plate comprises an outer frame and a grid plate fixed in the outer frame.

3. The large-scale breeding system of Ussuri whitefish seedlings according to claim 2 is characterized in that: The mesh plate has a square hole with a diameter of 1 mm x 1 mm.

4. The large-scale breeding system of Ussuri whitefish seedlings according to claim 1 is characterized in that: A large gear is fixed on the upper part of the rotating shaft, and the large gear is meshed with a small gear of a speed regulating motor, and the speed regulating motor is fixed on the upper cover of the upper part of the shell.

5. The large-scale breeding system of Ussuri whitefish seedlings according to claim 1 is characterized by: The diameter of the water diversion holes on the water diversion plate is 8 mm.

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