Depth-adjustable jellyfish sampling device and sampling method

Abstract

The invention relates to a depth-adjustable jellyfish sampling device and a sampling method, and solves the problems that an existing fixed jellyfish sampling netting gear cannot effectively collect and correctly reflect the real growth condition of jellyfish when rainfall changes. Comprising a floating box floating on the sea surface, a jellyfish sampling netting gear is hung below the floating box through a movable sling, a rainwater collecting box is arranged above the floating box, an opening is formed in the upper surface of the rainwater collecting box, a plurality of layers of drainage holes are evenly formed in each side face of the rainwater collecting box from bottom to top, and a water level touch switch is further arranged on one side wall of the rainwater collecting box; the water level touch switch controls the depth of the jellyfish sampling netting gear by controlling the rotation angle of the winch. The depth of the jellyfish sampling netting gear is adjusted according to the rainfall condition, so that the jellyfish sampling netting gear is always matched with the main movement depth of jellyfish, the sampling efficiency in jellyfish culture research is improved, and the influence of rainfall factors on jellyfish sampling is eliminated as far as possible.

Description

Technical Field

[0001] This invention belongs to the field of marine fisheries and relates to an adjustable-depth jellyfish sampling device and sampling method. Background Technology

[0002] Jellyfish are large, annual marine planktonic organisms that inhabit nearshore waters, particularly estuaries at depths of 5-20 meters. Jellyfish are an important species for restocking in Zhejiang Province, offering significant ecological and economic benefits. Due to the complex and variable marine environment, accurate data on jellyfish abundance and size in a specific sea area under different meteorological conditions requires sampling equipment for jellyfish abundance and size in a fixed sea area.

[0003] The climate at sea is complex and changeable, with frequent wind and rain. When there is short-term rainfall or light rain, jellyfish tend to stay in shallow water due to their phototaxis. However, during continuous rainfall or moderate to heavy rain, the rainwater brings a large amount of freshwater, causing the salinity of shallow water to drop rapidly and forming salinity stratification. To avoid low salinity stress, jellyfish tend to sink to the middle and lower layers where the salinity is more stable. During continuous heavy rainfall or even torrential rain, the salinity of the upper layer of seawater changes drastically. In addition, the strong winds and waves caused by the torrential rain cause violent mechanical disturbances (water turbulence), and jellyfish will have a strong avoidance response and will sink significantly to deeper and calmer water layers.

[0004] Traditional jellyfish sampling devices are typically sampling nets placed statically in seawater at a fixed depth. When the weather changes and jellyfish move vertically with the intensity of rainfall, the sampling efficiency of fixed sampling nets will be greatly reduced if they are placed outside the jellyfish's activity area, and may even fail to accurately reflect the true growth status of the jellyfish. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that existing fixed jellyfish sampling nets cannot effectively collect samples when rainfall changes, and cannot accurately reflect the actual growth of jellyfish. This invention provides an adjustable-depth jellyfish sampling device and method, which can change the depth of the jellyfish sampling net according to the amount of rainfall in the sea area, thereby improving the efficiency of jellyfish sampling.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: an adjustable-depth jellyfish sampling device, comprising a buoy floating on the sea surface, one or more jellyfish sampling nets suspended below the buoy, the jellyfish sampling nets comprising a rigid perforated plate, a catching net being provided on the bottom surface of the middle part of the perforated plate, forming a jellyfish sampling cage space between the catching net and the perforated plate, the catching net having several conical inlet nets evenly arranged around its circumference; a rain collection box being provided above the buoy, the rain collection box having an opening on its upper surface, several layers of drainage holes evenly arranged from bottom to top on each side of the rain collection box, a water level touch switch being provided on one side wall of the rain collection box; a winch being centrally located on the top surface of the buoy below the rain collection box, the winch having several movable slings wound around it, each movable sling passing through the buoy to suspend each side or corner of the jellyfish sampling net, a lifting motor being provided on one side of the winch, the water level touch switch controlling the depth of the jellyfish sampling net by controlling the rotation angle of the winch.

[0007] This device can adjust the depth of the jellyfish sampling net according to rainfall conditions, ensuring it always matches the jellyfish's primary activity depth. This improves sampling efficiency in jellyfish aquaculture research, allowing for the most efficient jellyfish capture within one or more time cycles (24 hours per cycle), minimizing the impact of rainfall on sampling. During sampling, the water level in the rain collection tank reflects the rainfall amount, and the depth of the jellyfish sampling net is adjusted accordingly to match the jellyfish's movement habits during rainy weather. The jellyfish sampling net uses a conical inlet net to create a sampling structure that is easy to enter but difficult to exit, further enhancing sampling efficiency.

[0008] Preferably, the outer opening of the inlet net is larger than the inner opening, the outer end of the inlet net is provided with a rigid inlet frame, and the inner end of the inlet net is connected to a capture net.

[0009] Preferably, multiple jellyfish sampling nets are provided, and each jellyfish sampling net is connected in series, with adjacent jellyfish sampling nets being hoisted and connected by fixed slings.

[0010] Preferably, a weighted bottom plate is suspended below the lowest jellyfish sampling net, and omnidirectional rolling wheels are installed at each corner of the weighted bottom plate. When the weighted bottom plate touches the bottom, the omnidirectional rolling wheels can roll laterally, so that the entire chain jellyfish sampling net remains as vertical as possible, avoiding serious tilting.

[0011] Preferably, a bait box is provided on the bottom surface of the perforated plate inside the catching net.

[0012] Preferably, a camera is provided on the bottom surface of the perforated plate inside the capture net.

[0013] Preferably, the lower end of the movable sling is connected to the jellyfish sampling net using a detachable hook.

[0014] Preferably, a sling pulley is provided on the top surface of the pontoon where the movable sling passes through.

[0015] A jellyfish sampling method, using the aforementioned adjustable-depth jellyfish sampling device, includes the following steps: S1, the water level touch switch of the rain collection box is set with 2-5 touch points from bottom to top, and the length of the movable sling 1-5 meters is set to be released downward when each touch point is touched, depending on the depth of the sampling sea area; S2, Attach one or more jellyfish sampling nets to the movable sling of the pontoon and place them in the sea area where jellyfish are farmed. When there is no rain, the top surface of the uppermost jellyfish sampling net should be no more than 2 meters away from the sea surface. S3, During rainfall, the drainage holes of the rain collection box drain water outward simultaneously. The higher the water level, the more drainage holes participate in the drainage. When the rainfall and drainage volume are similar, the water level in the rain collection box tends to stabilize, and the depth of the jellyfish sampling net stabilizes. S4. After the rain stops, as the water in the rain collection box is drained, the movable sling is retrieved, and the jellyfish sampling net is pulled back to the height in S2. S5. After 24 or 48 hours of sampling, retrieve the jellyfish sampling net that has been used and replace it with a new jellyfish sampling net to continue sampling.

[0016] This invention adjusts the depth of the jellyfish sampling net according to rainfall conditions, ensuring it always matches the jellyfish's main activity depth, thereby improving sampling efficiency in jellyfish aquaculture research and minimizing the impact of rainfall on jellyfish sampling. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a side structure of the present invention.

[0019] Figure 2 This is the invention Figure 1 A schematic diagram of the winch structure at point AA.

[0020] In the diagram: 1. Floating box, 2. Rain collection box, 3. Drainage hole, 4. Water level touch switch, 5. Winch, 6. Lifting motor, 7. Sling pulley, 8. Movable sling, 9. Hook, 10. Mesh plate, 11. Inlet net, 12. Inlet frame, 13. Catching net, 14. Bait box, 15. Camera, 16. Fixed sling, 17. Weighted bottom plate, 18. Universal rolling wheel, 19. Controller. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0022] Example 1: An adjustable-depth jellyfish sampling device, such as... Figure 1 As shown. This device includes a buoy 1 that floats on the sea surface, and in this example, two jellyfish sampling nets are suspended below the buoy 1.

[0023] The jellyfish sampling net includes a rigid perforated plate 10, which is square. A capture net 13 is provided on the bottom surface of the center of the perforated plate 10, forming a jellyfish sampling cage space between the capture net 13 and the perforated plate 10. A bait box 14 and a camera 15 are provided on the bottom surface of the perforated plate 10 inside the capture net 13. Four conical inlet nets 11 are evenly arranged around the circumference of the capture net 13. The outer opening of the inlet net 11 is larger than the inner opening. A rigid inlet frame 12 is provided at the outer end of the inlet net 11, and the inner end of the inlet net 12 is connected to the capture net 13. Two jellyfish sampling nets are connected in series, and adjacent jellyfish sampling nets are connected by a fixed sling 16. The upper end of the fixed sling 16 is suspended from the bottom surface of the inlet frame 12 of the upper jellyfish sampling net. Alternatively, it can be suspended from the bottom surface of the perforated plate 10 of the upper jellyfish sampling net. The lower end of the fixed sling 16 is suspended from the top surface of the perforated plate 10 of the lower jellyfish sampling net via a detachable hook. A weighted base plate 17 is suspended below the lower jellyfish sampling net, and omnidirectional rolling wheels 18 are installed at the bottom of each corner of the weighted base plate.

[0024] like Figure 1 , 2 As shown, a rain collection box 2 is installed above the pontoon. The upper surface of the rain collection box is open, and several layers of drainage holes 3 are evenly arranged on each side of the rain collection box 2 from bottom to top. A water level touch switch 4 is also installed on one side wall of the rain collection box. A winch 5 is centrally located on the top surface of the pontoon below the rain collection box 2. Several movable slings 8 are wound on the winch 5. Each movable sling 8 passes through the pontoon 1 to suspend the jellyfish sampling net at each corner. A sling pulley 7 is installed on the top surface of the pontoon where the movable slings 7 pass through. A lifting motor 6 is installed on one side of the winch 5. The water level touch switch 4 controls the depth of the jellyfish sampling net by controlling the rotation angle of the winch. In this example, the water level touch switch 4 of the rain collection box 2 has 5 touch points from bottom to top. When each touch point is touched, 2 meters of movable slings are released downwards.

[0025] Example 2: A jellyfish sampling method using the adjustable-depth jellyfish sampling device described in Example 1; comprising the following steps: S1, the water level touch switch of the rainwater collection tank is set with touch points from bottom to top. The length of the movable sling 2 meters is set to be released downward when each touch point is touched, according to the depth of the sampling sea area. S2, Attach one or more jellyfish sampling nets to the movable sling of the pontoon and place them in the sea area where jellyfish are farmed. When there is no rain, the top surface of the uppermost jellyfish sampling net should be no more than 2 meters away from the sea surface. S3, During rainfall, the drainage holes of the rain collection box drain water outward simultaneously. The higher the water level, the more drainage holes participate in the drainage. When the rainfall and drainage volume are similar, the water level in the rain collection box tends to stabilize, and the depth of the jellyfish sampling net stabilizes. S4. After the rain stops, as the water in the rain collection box is drained, the movable sling is retrieved, and the jellyfish sampling net is pulled back to the height in S2. S5. After 24 hours of sampling, retrieve the jellyfish sampling nets that have been used, replace them with new jellyfish sampling nets and continue sampling until all sampling work is completed.

Claims

1. An adjustable-depth jellyfish sampling device, comprising a buoy floating on the sea surface, characterized in that, One or more jellyfish sampling nets are suspended below the pontoon. Each jellyfish sampling net includes a rigid perforated plate with a capture net on the bottom surface of the middle part of the perforated plate. A net cage space for jellyfish sampling is formed between the capture net and the perforated plate. Several conical inlet nets are evenly arranged around the circumference of the capture net. A rain collection box is installed above the pontoon. The rain collection box has an opening on its upper surface and several layers of drainage holes are evenly arranged on each side of the rain collection box from bottom to top. A water level touch switch is also installed on one side wall of the rain collection box. A winch is centrally located on the top surface of the pontoon below the rain collection box. Several movable slings are wound onto the winch. Each movable sling passes through the pontoon to suspend the jellyfish sampling net from each side or corner. A lifting motor is installed on one side of the winch. The water level touch switch controls the depth of the jellyfish sampling net by controlling the rotation angle of the winch.

2. The adjustable-depth jellyfish sampling device according to claim 1, characterized in that, The outer opening of the inlet net is larger than the inner opening, and a rigid inlet frame is provided at the outer end of the inlet net. The inner end of the inlet net is connected to a capture net.

3. The adjustable-depth jellyfish sampling device according to claim 1, characterized in that, Multiple jellyfish sampling nets are set up, and each jellyfish sampling net is connected in series, with adjacent jellyfish sampling nets being hoisted and connected by fixed slings.

4. The adjustable-depth jellyfish sampling device according to claim 1, characterized in that, A heavy-duty base plate is suspended below the lowest jellyfish sampling net, and omnidirectional rolling wheels are installed at the bottom of each corner of the heavy-duty base plate.

5. The adjustable-depth jellyfish sampling device according to claim 1, characterized in that, A bait box is provided on the bottom surface of the perforated plate inside the catching net.

6. The adjustable-depth jellyfish sampling device according to claim 1, characterized in that, A camera is installed on the bottom surface of the perforated plate inside the capture net.

7. The adjustable-depth jellyfish sampling device according to claim 1, characterized in that, The lower end of the movable sling is connected to the jellyfish sampling net by a detachable hook.

8. The adjustable-depth jellyfish sampling device according to claim 1, characterized in that, The top surface of the pontoon is equipped with a sling pulley where the movable sling passes through the pontoon.

9. A jellyfish sampling method, characterized in that, The method of using the adjustable-depth jellyfish sampling device as described in claims 1-8 includes the following steps: S1, the water level touch switch of the rain collection box is set with 2-5 touch points from bottom to top, and the length of the movable sling 1-5 meters is set to be released downward when each touch point is touched, depending on the depth of the sampling sea area; S2, Attach one or more jellyfish sampling nets to the movable sling of the pontoon and place them in the sea area where jellyfish are farmed. When there is no rain, the top surface of the uppermost jellyfish sampling net should be no more than 2 meters away from the sea surface. S3, During rainfall, the drainage holes of the rain collection box drain water outward simultaneously. The higher the water level, the more drainage holes participate in the drainage. When the rainfall and drainage volume are similar, the water level in the rain collection box tends to stabilize, and the depth of the jellyfish sampling net stabilizes. S4. After the rain stops, as the water in the rain collection box is drained, the movable sling is retrieved, and the jellyfish sampling net is pulled back to the height in S2. S5. After 24 or 48 hours of sampling, retrieve the jellyfish sampling net that has been used and replace it with a new jellyfish sampling net to continue sampling.

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