In-situ trapping device for groupers cementation marking pool

Abstract

The utility model discloses a kind of in situ trapping devices for Lateolabrax maculatus cement marking coarse pool, comprising: screen frame main body, for the container shape with top open mouth, and skin is the screen of fine and close mesh eye;Inlet assembly, including flow guide member and hopper net bag;The flow guide member is installed in the screen frame main body side, so that the outlet of the flow guide member is communicated with the screen frame main body;The hopper net bag is fixed in the outlet of the flow guide member;It is realized that fry is not separated from water all the way, avoid the stress and injury caused by repeatedly fishing fry in traditional operation;Through short-term food stop to activate feeding desire, fish population actively enters screen frame main body, does not generate pursuit, purse seine and other driving behavior all the way;Small fish is driven to move downward using top-down illumination, bottom negative pressure water flow provides downward traction, ensure that the driving force of small fish escape is sufficient.

Description

Technical Field

[0001] This utility model is an in-situ trapping device for sea bass in cement breeding ponds, belonging to the field of aquaculture. Background Technology

[0002] Spotted sea bass is an important aquaculture fish in southeastern coastal China. In major producing areas such as Fujian and Guangdong, the production of spotted sea bass fry typically employs a relay model of "earthen pond fry rearing, cement pond nursery, and separate pond cultivation." Nursery ponds are generally rectangular cement ponds, with an area of ​​10-50 square meters and a water depth of 1.2-1.5 meters. When the fry in the nursery pond reach a size of 3 cm or more and individual differences begin to increase significantly, grading and selection must be carried out because spotted sea bass fry have a severe cannibalistic tendency.

[0003] Currently, seedling screening mainly relies on manual operation, which has problems such as repeated damage from being out of the water, low efficiency, high dependence on experience, and the need for secondary retrieval and placement in the pond.

[0004] Currently, there is a lack of a device specifically designed for cement-based pre-culturing ponds that can perform batch screening in situ and keep fish fry in the water throughout the entire process. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an in-situ trapping device for sea bass in cement breeding ponds to solve the problem.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: an in-situ trapping device for sea bass in cement broodstock ponds, comprising:

[0007] The main body of the sieve frame is container-shaped with an open top, and the surface is a fine mesh sieve.

[0008] An inlet assembly includes a flow guide and a funnel mesh; the flow guide is installed on the side of the screen frame body, so that the outlet of the flow guide is connected to the screen frame body; the funnel mesh is fixed to the outlet of the flow guide;

[0009] An induction component is installed above the open top of the sieve frame body to induce sea bass to enter and exit the sieve frame body; the induction component includes an LED light group and a feeding box; the LED light group projects light into the interior of the sieve frame body; the feeding box feeds fish into the interior of the sieve frame body;

[0010] The first grading component includes a grading screen and a first drainage component; the grading screen serves as the bottom skin of the screen frame body; the first drainage component is used to discharge water from inside the screen frame body to the outside of the grading screen.

[0011] The second grading component includes an openable and closable valve and a second drainage component; the valve is located on the side wall of the screen frame body; the second drainage component is used to discharge water inside the screen frame body to the outside of the valve.

[0012] Preferably, the drainage element has a hollow, funnel-shaped structure inside.

[0013] Preferably, a plurality of the first drainage components are provided and installed in an array at the bottom of the screen frame body.

[0014] Preferably, the funnel net is made of flexible mesh fabric; and the funnel net is funnel-shaped.

[0015] Preferably, a detachable lead weight is installed at the bottom of the sieve frame body.

[0016] Preferably, the ratio of the length of the screen frame body to the length of the cement coarsening tank is 1:2.5 to 1:2, the ratio of the width to the width of the cement coarsening tank is 1:2 to 1:1.7, and the ratio of the height to the water depth of the cement coarsening tank is 1:2 to 1:1.5.

[0017] Preferably, the aperture of the grading screen is selected from at least one of 8 mm, 12 mm or 15 mm.

[0018] Preferably, the mesh of the funnel net is fine-mesh.

[0019] Preferably, a mesh bag is provided at the bottom of the sieve frame body, and the mesh bag covers the area below the grading sieve.

[0020] Beneficial effects

[0021] This invention enables fish fry to remain in water throughout the entire process, avoiding the stress and damage caused by repeated catching in traditional operations; by activating the feeding desire through short-term fasting, the fish actively enter the main body of the screen frame, without any chasing, netting, or other driving behaviors throughout the process; by using top-down lighting to drive the small fish to move downwards, and the negative pressure water flow at the bottom to provide downward traction, ensuring sufficient driving force for the small fish to escape. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the in-situ trapping device for a cement breeding pond for sea bass according to the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the second hierarchical component of this utility model.

[0025] Attached reference numerals: Cement coarseness tank-100, Inlet component-2, Induction component-3, First grading component-4, Second grading component-5, Net bag-6, Drainage component-21, Funnel net bag-22, LED light group-31, Feeding box-32, Grading screen-41, First drainage component-42, Valve-51, Second drainage component-52. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] like Figure 1-2 As shown, this utility model provides an in-situ trapping device for a cement grading pond for sea bass. The entire device is submerged in the water of the cement grading pond 100. The device includes: a screen frame body 1, an inlet assembly 2 installed on its side, an induction assembly 3 set at the top, a first grading assembly 4 set at the bottom, and a second grading assembly 5 set on the side wall.

[0028] The main body of the screen frame 1 is a container-shaped structure with an open top, and its surface is a fine-mesh screen. To balance lightweight and high strength, the main body of the screen frame 1 is made of food-grade PVC or PE plastic pipes welded into a cuboid frame. The frame is filled with closed-cell foam floats, keeping its net weight in water at 5-8 kg, facilitating manual installation and retrieval. To ensure the stability of the device under hydrodynamic forces or pressure from fish, the bottom of the main body of the screen frame 1 is equipped with removable lead weights (preferably 1 kg each, 4-6 in total), allowing for flexible adjustment of the weight according to the flatness of the bottom of the grading tank.

[0029] The length ratio of the main body 1 of the screen frame to the length of the cement grading tank 100 is 1:2.5 to 1:2, the width ratio of the main body 1 to the width of the cement grading tank 100 is 1:2 to 1:1.7, and the height ratio of the height of the main body 1 to the water depth of the cement grading tank 100 is 1:2 to 1:1.5. In the deployed state, the upper edge of the main body 1 of the screen frame is kept 5-10 cm below the water surface of the grading tank to allow free water flow and facilitate the smooth entry of fish fry.

[0030] The inlet assembly 2 is installed on the side of the screen frame body 1 (usually the side facing the center of the cement coarsening tank 100), and includes a diversion component 21 and a funnel net 22.

[0031] The guide component 21 is installed on the side of the screen frame body 1, and its outlet is connected to the interior of the screen frame body 1. The guide component 21 has a funnel-shaped hollow structure inside, serving as an inlet guide channel in specific implementations. Its length is 30-50cm, and its width gradually narrows from 30-40cm near the center of the pool to 15-20cm. This funnel-shaped structure can guide the dispersed fish in a single-row, limited flow, effectively preventing multiple fry from crowding at the inlet simultaneously.

[0032] The funnel net 22 is fixed to the outlet of the drainage component 21. The funnel net 22 is made of flexible mesh fabric and is funnel-shaped (i.e., a conical funnel net structure) with a fine mesh. Preferably, the overall length of the funnel net 22 is 10-15 cm.

[0033] The induction component 3 is installed above the open top of the screen frame body 1, and is used to induce the sea bass to actively and unidirectionally enter the screen frame body 1. The induction component 3 includes an LED light group 31 and a feeding box 32.

[0034] The feeding box 32 is installed at the center of the top of the screen frame body 1 and is used to feed fish food (such as fish paste or sea bass feed) into the screen frame body 1. The feeding box 32 adopts a slow-release feeder with a capacity of 1-2 liters. The feeding speed can be precisely adjusted within the range of 50-100 grams / minute, and it is equipped with an automatic timer controller to attract hungry fish by the smell of food.

[0035] LED light assembly 31 is installed above the screen frame body 1, 10-15cm above the water surface, to project light into the interior of the screen frame body 1. Its light intensity is continuously adjustable within the range of 1000-2000 Lux, with the LEDs pointing directly downwards. This utilizes the fish fry's tendency to avoid strong light, forcing them to move towards the darker areas within the screen frame body 1 through downward lighting.

[0036] The first grading component 4 is used to enable small-sized fish fry to actively escape in situ from the screen frame body 1. It includes a grading screen 41 and a first drainage component 42.

[0037] The grading screen 41 serves as the bottom surface of the screen frame body 1 and is sealed to the bottom of the screen frame body 1 via a detachable snap-fit. To facilitate the sliding and aggregation of large fish fry that are intercepted, the grading screen 41 is made of flexible nylon material, and the mesh surface maintains a 5°-10° inclination angle with the horizontal plane, tilting towards the drainage and fish discharge direction. The effective screening area of ​​the grading screen 41 accounts for more than 90% of the total area of ​​the bottom of the screen frame. Its mesh aperture is selected based on the biological characteristics of the spotted bass fry's total length and body width, using at least one of 8 mm, 12 mm, or 15 mm: 8 mm screen is used when the total length is <4 cm (body width approximately 8-10 mm); 12 mm screen is used when the total length is 4-6 cm (body width 10-14 mm); and 15 mm screen is used when the total length is >6 cm (body width 14-18 mm).

[0038] Several first drainage components 42 are arranged in an array at the bottom of the screen frame body 1 (specifically, directly below the grading screen 41). The first drainage components 42 are used to drain water from inside the screen frame body 1 to outside the grading screen 41. In actual assembly, the first drainage component 42 uses a small drainage pump with its inlet facing the grading screen 41 and its outlet leading to the net bag 6. Upon startup, the controlled pumping speed of the first drainage component 42 is 0.05-0.1 m / s, creating a weak, vertically downward negative pressure water flow on the surface of the grading screen 41. This flow, in conjunction with the LED light group 31 above, draws small fish fry through the grading screen 41 into the net bag 6.

[0039] The second grading component 5 is used to export large-sized target fish fry intercepted in the screen frame body 1 after the first grading component 4 has finished grading. It includes an openable and closable valve 51 and a second drainage component 52.

[0040] The valve 51 is located on the side wall of the screen frame body 1, near the inclined lower edge of the grading screen 41. In a specific implementation, the valve 51 is a 30cm wide lateral fish outlet, equipped with a slide gate that can be opened and closed vertically.

[0041] The second drainage component 52 is used to discharge the water inside the screen frame body 1 to the outside of the valve 51. In practical applications, the second drainage component 52 is a small submersible pump installed on the horizontal side opposite the valve 51 (inner wall of the front end of the screen frame body 1). When the valve 51 is opened, the second drainage component 52 is activated, and its controlled flow velocity is 0.1-0.15 m / s, generating a horizontal directional water flow towards the valve 51 (fish outlet). The intercepted large fish fry have a strong phototaxis towards the current or downstream, and will spontaneously and undamagedly swim out through the valve 51 under the guidance of this directional water flow.

[0042] Furthermore, a detachable net bag 6 is provided at the bottom of the sieve frame body 1. The net bag 6 covers the grading sieve 41 and is used to prevent small fish fry that have already passed through the first grading component 4 from re-entering the sieve frame body 1.

[0043] When using the above-mentioned in-situ trapping device to perform in-situ grading of spotted bass fry in a cement pre-nurturing pond of 100, the following steps shall be performed:

[0044] Step 1: Before grading, stop feeding the spotted bass fry in the target cement broodstock pond for 24-48 hours to activate and enhance the feeding desire and food sensitivity of the entire fish population.

[0045] Step 2: After assembling the counterweight lead block and the initial aperture (e.g., 8mm) grading screen 41, slowly lower it into the middle section of the pool, ensuring the entire screen frame body 1 is submerged with its upper edge 5-10cm below the water surface, and the guide component 21 facing the center of the pool. Fill the feeding box 32 with fish food and set the controller to slowly release the food onto the screen frame body 1 at a rate of 50-100 grams per minute.

[0046] Step 3: Attracted by the bait, the sea bass in the pond gather one after another, and are restricted into a single line through the funnel-shaped channel of the guide 21, passing through the funnel-shaped net 22 and entering the interior of the screen frame body 1. The induction continues for 20-40 minutes until the fish density in the screen frame body 1 reaches 30%-50% of the effective volume of the frame.

[0047] Step 4: Pause feeding from the feeding box 32 and simultaneously activate the LED light group 31 and the first drainage component 42. The LED light group 31 shines directly downwards at a light intensity of 1500 Lux, while the array-type first drainage component 42 pumps water downwards at a flow rate of 0.08 m / s. Smaller fish fry are stimulated by the light and move downwards, actively escaping through the grading screen 41 into the net bag 6 under the negative pressure traction of the water flow; larger fish fry are intercepted within the screen frame body 1. This step lasts for 5-10 minutes.

[0048] Step 5: Turn off the light assembly and the first drainage component 42, pull up the openable valve 51, and simultaneously activate the second drainage component 52 to generate a horizontal directional water flow outward at 0.1-0.15 m / s. The intercepted large fish fry will quickly swim out of valve 51 with the current.

[0049] Step Six: If further fine grading is required, lift the device and quickly replace it with a larger aperture (such as 12mm or 15mm) grading screen 41. Repeat the above steps for the relatively large fish flowing out of the previous stage to achieve fine separation step by step.

[0050] Example 1

[0051] This embodiment was conducted in a standard rectangular cement pre-breeding pond 100, with dimensions of 8m × 4m × 1.2m. Approximately 8000 spotted bass fry, ranging from 3-7 cm in length, were stocked, corresponding to an initial stocking density of about 250 fry / m² (within the optimal density range of 150-300 fry / m²). The recommended dimensions for the screen frame body 1 are 4 meters long, 2.5 meters wide, and 0.8 meters high (length is half the pond length, width is three-fifths of the pond width), with its upper edge 8 cm below the water surface. The bottom grading screen 41 initially uses nylon mesh with an 8 mm aperture. Three equally spaced inlet components 2 are arranged side-by-side, with a guide component 21 40 cm long and an inlet width gradually narrowing from 35 cm to 18 cm. After the spotted bass fry have been withheld from feeding for 36 hours, the device is installed, and the feeding box 32 is opened to slowly release fish paste at a rate of 70 g / min. After approximately 35 minutes of continuous feeding and trapping, the fish density in the main body of the sieve frame reached 40% of its volume. Feeding was then suspended, and the LED light group 31 (1500 Lux) and the array-type first drainage component 42 (0.08 m / s flow rate) were activated in conjunction for 8 minutes. Small fry (<4 cm in length) quickly escaped back to their original pond through the 8 mm mesh of the bottom grading sieve 41. The first drainage component 42 was then closed, the side-mounted openable valve 51 was opened, and the second drainage component 52 was activated to create a horizontal directional water flow at a velocity of 0.12 m / s. Larger fry swam downstream out of valve 51. The fry remained in the water throughout the entire process, which took 50 minutes, without any mechanical damage or stress response.

[0052] Example 2

[0053] In this embodiment, the production pond is a high-density rectangular cement pre-culturing pond 100, with specific dimensions of 6m × 4m × 1.2m. The stocking density of spotted bass fry reached approximately 380 fish / square meter (within the normal operating range of 300-400 fish / square meter). To address the issue that overcrowding at high densities can easily affect grading accuracy, the process parameters were fine-tuned: the slow-release feeding rate of the feeding box 32 was proactively reduced to 40 grams / minute to slow the influx of fish, and the one-way trapping time of the inlet component 2 was correspondingly extended to 55 minutes. During the bottom escape grading stage, the combined stimulation time of the LED light group 31 and the first drainage component 42 was extended to 12 minutes, providing more time for the fry to queue and escape at high densities. The remaining device structure and standard operating procedures are identical to those in Embodiment 1. Final statistics show that high-precision in-situ grading was achieved even at high densities.

[0054] Example 3

[0055] This embodiment is designed for low-density aquaculture scenarios. The farm has two adjacent rectangular cement nursery ponds 100, each with an area of ​​15 square meters. Currently, the stocking density in each pond is only about 60 fish / square meter (below the optimal range of 150-300 fish / square meter). Because such low density in a single pond leads to a significant decrease in efficiency during a single trapping operation due to the fish being too dispersed, this embodiment removes and opens the temporary central partition between the two adjacent cement nursery ponds 100 before the grading operation, connecting and merging the two ponds into a single 30-square-meter integrated pond. This increases the overall stocking density to be graded to approximately 120 fish / square meter (entering the normal applicable density range). The device is then placed in the merged integrated pond. Considering the increased density, the feeding induction time of the feeding box 32 is set to approximately 50 minutes to fully mobilize the scattered fish. Once the fish population in the main body of the sieve frame 1 reaches the required level, the first drainage component 42 is activated and runs continuously for 8 minutes to perform bottom escape grading. The remaining operations and device parameters are consistent with Embodiment 1, successfully avoiding the low-density efficiency trap.

[0056] Example 4: Adaptability and Expansion of Circular Pool Structure

[0057] This embodiment is applied to a common circular cement nursery pond 100 used in factory-scale recirculating aquaculture systems. The pond has a diameter of 6 meters, an effective water depth of 1.3 meters, and a stocking density of approximately 200 fish per square meter. To perfectly fit the curvature of the circular pond wall, this embodiment makes local structural adaptation modifications to the device: the overall outer frame of the screen frame body 1 is welded into an arc-shaped structure, with specific geometric parameters of an arc length of 3.5 meters, a width of 2.5 meters, and a height of 0.8 meters; correspondingly, the hollow internal structure of the inlet component 2's guide piece 21 is expanded into a fan-shaped collecting groove, with the total arc length of the inlet facing the center of the pond reaching 3 meters. Simultaneously, to better gather fish fry in the circular, dead-angle-free water body, an escape-prevention net is added to the outer perimeter of the device, and a flexible fish-driving net capable of sliding along the circular pond wall in an arc is used. The flexible fish-driving net is driven by an electric rotating arm installed at the center of the circular pool. Its rotation speed is set to an extremely slow 0.25 rpm, gently pushing the sea bass from the distant waters into the fan-shaped guide channel of the guide component 21 through this very slow rotation, without startling the fish. The remaining internal core components of the device (such as the feeding box 32, the grading screen 41, the array-type first drainage component 42, and the openable / closable valve 51) and the specific grading operation method are completely identical to those in Example 1, achieving the same high-efficiency, low-stress in-situ grading effect in the circular pool water.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An in-situ trapping device for sea bass in cement breeding ponds, characterized in that: include: The main body of the sieve frame is container-shaped with an open top, and the surface is a fine mesh sieve. An inlet assembly includes a flow guide and a funnel mesh; the flow guide is installed on the side of the screen frame body, so that the outlet of the flow guide is connected to the screen frame body; the funnel mesh is fixed to the outlet of the flow guide; An induction component is installed above the open top of the sieve frame body to induce sea bass to enter and exit the sieve frame body; the induction component includes an LED light group and a feeding box; the LED light group projects light into the interior of the sieve frame body; the feeding box feeds fish into the interior of the sieve frame body; The first grading component includes a grading screen and a first drainage component; the grading screen serves as the bottom skin of the screen frame body; the first drainage component is used to discharge water from inside the screen frame body to the outside of the grading screen. The second grading component includes an openable and closable valve and a second drainage component; the valve is located on the side wall of the screen frame body; the second drainage component is used to discharge water inside the screen frame body to the outside of the valve.

2. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: The drainage component has a hollow, trumpet-shaped internal structure.

3. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: The first drainage component is provided in several units and is installed in an array at the bottom of the screen frame body.

4. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: The funnel net is made of flexible mesh fabric; and the funnel net is funnel-shaped.

5. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: The bottom of the sieve frame body is equipped with a detachable lead weight.

6. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: The ratio of the length of the main body of the screen frame to the length of the cement coarsening tank is 1:2.5 to 1:2, the ratio of the width to the width of the cement coarsening tank is 1:2 to 1:1.7, and the ratio of the height to the water depth of the cement coarsening tank is 1:2 to 1:1.

5.

7. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: The aperture of the grading screen is selected from at least one of 8 mm, 12 mm or 15 mm.

8. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: The funnel net bag has a fine mesh.

9. The in-situ trapping device for a cement-filled broodstock pond according to claim 1, characterized in that: A mesh bag is installed at the bottom of the main body of the sieve frame, which covers the area below the grading sieve.

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