Demersal roe hatching device

Abstract

The utility model discloses a demersal roe hatching device, which relates to the technical field of roe hatching and comprises a hatching container, a hatching sieve bed, a weeping pipe and an overflow pipe, the overflow pipe and the hatching sieve bed are arranged in the hatching container, the top of the hatching container is open, the weeping pipe is arranged above the hatching container and communicated with a water inlet pipe, and a sieve is laid in the hatching sieve bed. Meshes of the screen mesh are smaller than the diameter of the fertilized eggs, so that the fertilized eggs can be flatly laid on the screen mesh before incubation, and the incubation screen bed is at least 10cm lower than an overflow port of the overflow pipe. The fertilized eggs can be flatly laid on the screen in the hatching screen bed in the middle layer of the water body, it is guaranteed that each fertilized egg can obtain sufficient dissolved oxygen supply of the water body, the development requirement is met, hatched fries can fall into the bottom of the hatching container from the screen in time, and the hatching efficiency is improved. Dead eggs and egg shells can be effectively prevented from being infected with water mildew to harm development of other normal fertilized eggs, the work intensity of manually picking up the dead eggs in a traditional hatching mode is reduced, and the hatching rate of the fertilized eggs and the survival rate of juvenile fishes are increased.

Description

Technical Field

[0001] The utility model relates to the technical field of fish egg hatching, in particular to a sinking fish egg hatching device. Background Technique

[0002] The hatching of fry is one of the important links in the production of aquaculture varieties. How to improve the hatching rate has always been the focus of people's attention. At present, fry are mainly hatched artificially. First, the fertilized eggs need to be taken out, and by improving specific environmental conditions (such as controlling water temperature, water flow, and dissolved oxygen in water) and improving facilities and equipment, etc., the fertilized eggs can be better hatched into fry.

[0003] The purpose of artificial hatching is to improve the hatching efficiency and hatching rate of fertilized eggs, so as to meet the requirements of industrialization as much as possible. However, for the fertilized eggs of some fish species, the hatching time is relatively long, and the bad eggs will diffuse with the water flow in the water, which is extremely easy to cause pollution to the good fertilized eggs; in addition, the hatching of fertilized eggs requires dissolved oxygen, and the lack of dissolved oxygen often causes anoxic death of eggs, and the water mold of dead eggs will also infect healthy fertilized eggs and hatched fry. To avoid the infection of water mold by dead eggs and harm the development of other normal fertilized eggs, it is necessary to rely on manual picking out of dead eggs, which is difficult and laborious, and the hatching rate of fertilized eggs and the survival rate of fry will also be affected. Therefore, it is urgent to research a more economical and effective fish egg hatching device. Content of the Utility Model

[0004] The purpose of the utility model is to provide a sinking fish egg hatching device to solve the problems existing in the above-mentioned prior art, so that each fertilized egg can obtain sufficient dissolved oxygen supply in the water body, meet the development needs, avoid anoxic death of eggs caused by lack of dissolved oxygen and bacterial infection, and improve the hatching rate of fertilized eggs and the survival rate of fry.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides a sinking fish egg hatching device, which includes a hatching container, a hatching screen bed, a drip water pipe and an overflow water pipe. The overflow water pipe and the hatching screen bed are arranged inside the hatching container, the top is open and the drip water pipe is arranged above it. The drip water pipe is connected to a water inlet pipe. A screen is laid in the hatching screen bed, and the mesh size of the screen is smaller than the diameter of the fertilized eggs, so that the fertilized eggs can be laid flat on the screen before hatching. The hatching screen bed is at least 10 cm lower than the overflow port of the overflow water pipe and there is a gap between it and the bottom plate of the hatching container.

[0007] Preferably, the hatching screen bed includes a frame and the screen. The edge of the screen is fixed on the frame, and the mesh size of the screen is 0.5 mm - 1 mm smaller than the diameter of the fertilized eggs.

[0008] Preferably, the mesh size of the sieve mesh is (1.0 mm - 2.5 mm) * (1.0 mm - 2.5 mm), the hatching sieve bed is 10 cm - 15 cm away from the bottom plate of the hatching container, and the liquid level in the hatching container is 35 cm - 45 cm.

[0009] Preferably, at least one overflow pipe is provided and is located at the centroid or the axis of symmetry of the cross-section of the hatching container; the height of the overflow pipe is 40 cm and the top is open, a filter screen is provided at the overflow port, and the mesh size of the filter screen is smaller than the diameter of the fertilized eggs.

[0010] Preferably, a protective pipe is sleeved outside the overflow pipe, the bottom of the protective pipe is fixed on the bottom plate of the hatching container, the top is higher than the height of the hatching container, and water passing holes are provided in the middle.

[0011] Preferably, a support ring and a pressure ring are connected to the outside of the protective pipe by threads, and the hatching sieve bed is clamped between the support ring and the pressure ring.

[0012] Preferably, the diameter of the protective pipe is 20 cm and the height is at least 40 cm, the diameter of the overflow pipe is 10 cm, the water passing holes are evenly distributed on the pipe wall of the protective pipe, and a filter screen is provided on the water passing holes, and the mesh size of the filter screen is smaller than the diameter of the fertilized eggs.

[0013] Preferably, a plurality of water dripping holes are evenly distributed below the water dripping pipe, the end of the water dripping pipe is closed, the shape of the water dripping pipe matches the shape of the hatching container and can make the water dripping holes evenly distributed in the hatching container, the distance between adjacent water dripping holes is 8 cm - 10 cm, and the diameter of the water dripping holes is 1.5 mm - 2 mm.

[0014] Preferably, the water inlet speed of the water dripping pipe is the same as the water outlet speed of the overflow pipe, the shape of the hatching container includes regular polygons, circles and ellipses, and the shape of the water dripping pipe includes straight rods, circles, regular polygons and ellipses.

[0015] Preferably, a plurality of groups of hatching containers are provided, the water inlet pipe is connected to a plurality of branch pipes through a booster pump, the branch pipes are communicated with the water dripping pipes in each group of hatching containers, the overflow pipes in each group of hatching containers are communicated with a water outlet pipe through branch pipes, and valves are provided on each branch pipe.

[0016] The present utility model has achieved the following technical effects compared with the prior art:

[0017] The device of the utility model can be suitable for hatching sinking fish eggs. The fertilized eggs can be laid flat on the screen in the hatching screen bed and located in the middle layer of the water body, ensuring that each fertilized egg can obtain sufficient dissolved oxygen supply from the water body to meet the development needs. The hatched fry can fall from the screen to the bottom of the hatching container in time, which can effectively prevent dead eggs and egg shells from being infected with water molds and endangering the development of other normal fertilized eggs. At the same time, the oxygen-deficient dead eggs caused by the lack of dissolved oxygen can be avoided as much as possible, and the difficulty and intensity of the work of manually picking up dead eggs in the traditional hatching method are reduced, thereby effectively improving the hatching rate of fertilized eggs and the survival rate of young fish. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the sinking fish egg hatching device in the first embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the sinking fish egg hatching device in the first embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the sinking fish egg hatching device in the second embodiment of the present utility model;

[0022] In the figure: 1-sinking fish egg hatching device, 2-hatching container, 3-hatching screen bed, 4-drip pipe, 5-overflow pipe, 6-protection pipe, 7-support ring, 8-pressure ring, 9-water inlet pipe, 10-boosting pump, 11-branch pipe, 12-valve, 13-drip hole, 14-water hole, 15-water outlet pipe, 16-lifting handle. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The purpose of the present utility model is to provide a sinking fish egg hatching device to solve the problems existing in the prior art, so that each fertilized fish egg can obtain sufficient dissolved oxygen supply in the water body, meet the development requirements, avoid oxygen-deficient dead eggs caused by lack of dissolved oxygen, and improve the hatching rate of fertilized eggs and the survival rate of fry.

[0025] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1

[0027] As Figures 1 to 3 shown, in this embodiment, a sinking fish egg hatching device 1 is provided, which includes an incubation container 2, an incubation sieve bed 3, a drip water pipe 4, and an overflow water pipe 5. An overflow water pipe 5 and an incubation sieve bed 3 are arranged inside the incubation container 2. The top is open and a drip water pipe 4 is arranged above it. The drip water pipe 4 is connected to a water inlet pipe 9. A sieve mesh is laid in the incubation sieve bed 3, and the mesh size of the sieve mesh is smaller than the diameter of the fertilized eggs, so that the fertilized eggs can be laid flat on the sieve mesh before hatching. The height of the incubation sieve bed 3 is at least 10 cm lower than the overflow port of the overflow water pipe 5 and there is a gap between it and the bottom plate of the incubation container 2, so that the incubation sieve bed 3 is located in the middle layer of the water body. The incubation container 2 is preferably arranged on a bracket to facilitate the discharge of water from the overflow water pipe 5.

[0028] As an alternative solution, in this embodiment, the incubation sieve bed 3 includes a frame and a sieve mesh. The edge of the sieve mesh is fixed to the frame. The mesh size of the sieve mesh is 0.5 mm - 1 mm smaller than the diameter of the fertilized eggs. While preventing the fertilized eggs from falling, it is convenient to lay the fertilized eggs flat on the sieve mesh. Among them, support columns are evenly distributed on the edge of the incubation sieve bed 3 or it is clamped on the support steps inside the incubation container 2 for limit fixation. The frame of the incubation sieve bed 3 is preferably made of stainless steel, which is heavy in quality and convenient for sinking installation. It can also be made of three-type polypropylene (PPR) or polyvinyl chloride (PVC). The edge of the incubation sieve bed 3 is preferably provided with a lifting handle 16 to facilitate the disassembly of the incubation sieve bed 3.

[0029] As an alternative, in this embodiment, the mesh size of the sieve mesh is generally (1.0 mm - 2.5 mm) * (1.0 mm - 2.5 mm). Among them, the mesh with a side length of about 2 mm is applicable to the hatching of the fertilized eggs of Neolissochilus heterostomus. The size of the mesh is reasonably selected according to the volume of the fertilized eggs after absorbing water and swelling. It is necessary to ensure that the fertilized eggs will not leak out of the mesh, and at the same time, it is convenient for the fry to fall to the bottom from the mesh after hatching. The hatching sieve bed 3 is 10 cm - 15 cm away from the bottom plate of the hatching container 2, preferably 15 cm. The liquid level in the hatching container 2 is 35 cm - 45 cm, preferably 40 cm. The sieve mesh in this embodiment can ensure that each fertilized egg can obtain sufficient dissolved oxygen supply in the water body to meet the development requirements. The hatched fry can fall into the bottom of the hatching container 2 from the sieve mesh in time, which can effectively avoid the infection of water mold by dead eggs and eggshells and harm the development of other normal fertilized eggs.

[0030] As an alternative, in this embodiment, at least one overflow pipe 5 is provided and is located at the centroid or axis of symmetry of the cross-section of the hatching container 2. If there is one overflow pipe 5, it is located at the centroid of the cross-section of the hatching container 2. If there are multiple overflow pipes 5, they are located on the axis of symmetry of the cross-section of the hatching container 2. The circular hatching container 2 can make the overflow pipe 5 located at the center of the circle, and the rectangular hatching container 2 can make the overflow pipes 5 evenly distributed on its axis of symmetry. The height of the overflow pipe 5 is 40 cm and the top is open. A filter screen is provided at the overflow port, and the mesh size of the filter screen is smaller than the diameter of the fertilized eggs to prevent the fertilized eggs from being washed away by the water flow.

[0031] As an alternative, in this embodiment, a protective pipe 6 is sleeved outside the overflow pipe 5. The bottom of the protective pipe 6 is fixed on the bottom plate of the hatching container 2, the top is higher than the height of the hatching container 2, and water passing holes 14 are provided in the middle to prevent the water flow from being too violent and washing away the fertilized eggs, and at the same time, it can make the replacement of water inlet and outlet uniform, so as to ensure that each fertilized egg can obtain sufficient dissolved oxygen supply in the water body. The overflow pipe 5 and the protective pipe 6 are preferably made of PVC material.

[0032] As an alternative, a support ring 7 and a pressure ring 8 are connected to the outside of the protective pipe 6 by threads. The hatching sieve bed 3 is clamped between the support ring 7 and the pressure ring 8 to provide support and positioning for the inside of the hatching sieve bed 3, and it is convenient to disassemble and the height is adjustable.

[0033] As an alternative, in this embodiment, the diameter of the protective pipe 6 is 20 cm and the height is at least 40 cm. The diameter of the overflow pipe 5 is 10 cm. The water passing holes 14 are evenly distributed on the pipe wall of the protective pipe 6, and the aperture of the water passing holes 14 is about 1 cm - 2 cm to prevent the water flow from being too violent, ensure the stability of the water flow, reduce the water flow fluctuation received by the fertilized eggs, and a filter screen is provided on the water passing holes 14, and the mesh size of the filter screen is smaller than the diameter of the fertilized eggs to prevent the fertilized eggs from being washed away by the water flow.

[0034] As an alternative, in this embodiment, a number of water dripping holes 13 are evenly distributed below the water dripping pipe 4. The end of the water dripping pipe 4 is closed. The shape of the water dripping pipe 4 matches the shape of the hatching container 2 and can make the water dripping holes 13 evenly distributed in the hatching container 2. The distance between adjacent water dripping holes 13 is 8 cm - 10 cm, and the diameter of the water dripping holes 13 is 1.5 mm - 2 mm, so as to avoid excessive water flow vibration affecting the distribution of fertilized eggs.

[0035] As an alternative, in this embodiment, the water inlet speed of the water dripping pipe 4 is the same as the water outlet speed of the overflow pipe 5. The water dripping pipe 4 continuously injects new water, and the purpose of water body exchange is achieved through the overflow action of the overflow pipe 5 to keep the water quality of the hatching water fresh. The shape of the hatching container 2 includes regular polygons, circles and ellipses. The shape of the water dripping pipe 4 includes straight rods, circles, regular polygons and ellipses. A suitable layout method can be selected according to the hatching container 2, and it is advisable that the water dripping holes 13 are evenly distributed in the hatching container 2.

[0036] Embodiment Two

[0037] As Figure 3 shown, in this embodiment, a large-sized demersal fish egg hatching device 1 is provided, in which a number of groups of hatching containers 2 are provided. The water inlet pipe 9 is connected with a number of branch pipes 11 through a booster pump 10. The branch pipes 11 are communicated with the water dripping pipes 4 in each group of hatching containers 2. The overflow pipes 5 in each group of hatching containers 2 are communicated with a water outlet pipe 15 through the branch pipes 11. A valve 12 is arranged on each branch pipe 11 to facilitate controlling the flow rate of water inlet or outlet and keeping the two in balance. The water source can be selected as mountain spring water or sun-exposed and aerated tap water.

[0038] The working principle and working process of the demersal fish egg hatching device 1 in this embodiment are specifically as follows: First, ensure that the hatching room is at a suitable hatching temperature, generally 19°C - 25°C. Fill the hatching container 2 with water to a water level of about 40 cm, sink the hatching frame into the water, about 10 - 15 cm below the water surface, and position the hatching frame in the middle of the water body through the support ring 7 and the pressure ring 8 in the middle. At the same time, one water inlet pipe 9 can be connected with a number of hatching containers 2 through a booster pump 10 to increase the hatching quantity of one operation. Manually spread the fertilized eggs obtained by artificial insemination as evenly as possible on the screen, without stacking. During the hatching process, fresh water continuously flows into the hatching container 2 in a dripping state through the dripping pipeline to ensure rich dissolved oxygen and fresh water quality in the hatching container 2. At the same time, the overflow pipe drains away the excess water. After the corresponding hatching time, after the fry hatch, with the slight swing of the seedlings, they can fall through the sieve holes to the bottom of the hatching container 2 and continue to be cultivated. The fish eggs remaining on the screen are either dead eggs or deformed eggs, and then the hatching sieve bed 3 can be disassembled and pulled out for cleaning. Generally, the hatching temperature of Neolissochilus heterostomus is 19°C - 25°C, the hatching time is about 4 - 5 days, and the whole process from fry to pond release takes at least 16 days.

[0039] The sinking fish egg hatching device 1 in this embodiment can be used for hatching most sinking fish eggs, greatly reducing the infection of healthy fish eggs and newly hatched fry by dead egg water mold, reducing the difficulty of manually removing dead eggs in the traditional hatching method, effectively improving the hatching rate of fertilized eggs and the survival rate of fry. It has a simple structure, low cost, and the hatching rate is at least above 80%.

[0040] In this utility model, specific examples are used to elaborate on the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of the utility model; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the utility model.

Claims

1. A sinking fish egg hatching device, characterized in that: It includes an incubation container, an incubation sieve bed, a drip pipe and an overflow pipe. The overflow pipe and the incubation sieve bed are arranged inside the incubation container. The top of the incubation container is open and the drip pipe is arranged above it. The drip pipe is connected to a water inlet pipe. A sieve mesh is laid in the incubation sieve bed. The mesh size of the sieve mesh is smaller than the diameter of the fertilized eggs, so that the fertilized eggs can be laid flat on the sieve mesh before hatching. The incubation sieve bed is at least 10 cm lower than the overflow opening of the overflow pipe and there is a gap between it and the bottom plate of the incubation container.

2. The sinking fish egg hatching device according to claim 1, characterized in that: The incubation sieve bed includes a frame and the sieve mesh. The edge of the sieve mesh is fixed on the frame. The mesh size of the sieve mesh is 0.5 mm - 1 mm smaller than the diameter of the fertilized eggs.

3. The sinking fish egg hatching device according to claim 1, characterized in that: The mesh size of the sieve mesh is (1.0 mm - 2.5 mm) * (1.0 mm - 2.5 mm). The incubation sieve bed is 10 cm - 15 cm away from the bottom plate of the incubation container. The liquid level in the incubation container is 35 cm - 45 cm.

4. The sinking fish egg hatching device according to claim 1, characterized in that: There is at least one overflow pipe and it is located at the centroid or the axis of symmetry of the cross-section of the incubation container. The height of the overflow pipe is 40 cm and its top is open. A filter screen is arranged on the overflow opening. The mesh size of the filter screen is smaller than the diameter of the fertilized eggs.

5. The sinking fish egg hatching device according to claim 1, wherein: A protective pipe is sleeved outside the overflow pipe. The bottom of the protective pipe is fixed on the bottom plate of the incubation container. The top of the protective pipe is higher than the height of the incubation container. Water passing holes are arranged in the middle of the protective pipe.

6. The sinking fish egg hatching device according to claim 5, characterized in that: A support ring and a pressure ring are connected to the outside of the protective pipe by threads. The incubation sieve bed is clamped between the support ring and the pressure ring.

7. The sinking fish egg hatching device according to claim 5, characterized in that: The diameter of the protective pipe is 20 cm and its height is at least 40 cm. The diameter of the overflow pipe is 10 cm. The water passing holes are evenly distributed on the pipe wall of the protective pipe. A filter screen is arranged on the water passing holes. The mesh size of the filter screen is smaller than the diameter of the fertilized eggs.

8. The sinking fish egg hatching device according to claim 1, characterized in that: A number of drip holes are evenly distributed below the drip pipe. The end of the drip pipe is closed. The shape of the drip pipe matches the shape of the incubation container and can make the drip holes evenly distributed in the incubation container. The distance between adjacent drip holes is 8 cm - 10 cm. The diameter of the drip holes is 1.5 mm - 2 mm.

9. The sinking fish egg hatching device according to claim 1, characterized in that: The water inlet speed of the drip pipe is the same as the water outlet speed of the overflow pipe. The shape of the incubation container includes regular polygons, circles and ellipses. The shape of the drip pipe includes straight rods, circles, regular polygons and ellipses.

10. The sinking fish egg hatching device according to claim 1, characterized in that: There are several groups of incubation containers. The water inlet pipe is connected to several branch pipes through a booster pump. The branch pipes are connected to the drip pipes in each group of incubation containers. The overflow pipes in each group of incubation containers are connected to an outlet pipe through branch pipes. Valves are arranged on each branch pipe.

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