A device for catching long-spined sea urchins and a method of using the same

Abstract

The application provides a device for catching long-spined sea star and a use method thereof, which comprises a framework, a netting with a reserved entrance arranged outside the framework, and a containing space arranged inside the framework, a coral-like prosthesis with an arc-shaped half ring arranged on the surface of the containing space, an opening formed on the surface of the coral-like prosthesis corresponding to the arc-shaped half ring, a first silica gel arranged on the inner edge of the opening, a second silica gel arranged on the inner surface of the arc-shaped half ring, and the first silica gel and the second silica gel connected through an elastic rope net. The application can be used for centralized catching and processing when the long-spined sea star breaks out, and can avoid catching fish, shrimps, crabs and other aquatic animals in the sea area, and can evaluate the catching effect, which has obvious significance for fishery ecological control and repair.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine biology fishing, in particular to a device for fishing Crown-of-Thorns Starfish and a method for using the same. BACKGROUND

[0002] Crown-of-Thorns Starfish (CoTS) has long and sharp spines on its body surface, and people will be in severe pain after being pricked by the Crown-of-Thorns Starfish, and the pain will last for a long time. Crown-of-Thorns Starfish is known as the "coral killer" and is the main factor causing coral loss and destroying coral reefs. It feeds on the living tissues of many coral species, causing coral to bleach and die.

[0003] Crown-of-Thorns Starfish has natural enemies. There are many natural enemies of Crown-of-Thorns Starfish in the planktonic larval stage, such as some coral reef fish that feed on plankton. Subsequently, the Crown-of-Thorns Starfish larvae will attach to the seabed, and some large invertebrates can still feed on them. As the Crown-of-Thorns Starfish grows, a few carnivorous fish, including Cheilinus undulatus and Abudefduf vaigiensis, can prey on them. According to a new study by the Australian Institute of Marine Science, coral reef fish, such as Siganus, Lutjanus and Sciaenops, help control the number of Crown-of-Thorns Starfish on the Great Barrier Reef, especially Cheilinus unifasciatus and Abudefduf vaigiensis, both of which are famous predators of Crown-of-Thorns Starfish benthic larvae. As for adult Crown-of-Thorns Starfish, only a few marine organisms such as Tridacna gigas are their natural enemies. SUMMARY

[0004] In order to overcome the deficiencies in the prior art, the present application provides a device for fishing Crown-of-Thorns Starfish and a method for using the same.

[0005] To achieve the above-mentioned purpose, the present application provides a device for fishing Crown-of-Thorns Starfish, which comprises a framework, a netting with a reserved entrance arranged outside the framework, a containing space inside the framework, a coral-like prosthesis with an arc-shaped half ring arranged on the surface of the containing space, an opening formed on the surface of the coral-like prosthesis corresponding to the arc-shaped half ring below, a first silica gel arranged on the inner edge of the opening, a second silica gel arranged on the inner surface of the arc-shaped half ring, and an elastic rope net connecting the first silica gel and the second silica gel.

[0006] Preferably, a wave-shaped plate is arranged around the coral-like prosthesis.

[0007] Preferably, the upper part of the coral-like prosthesis is connected to the framework through an elastic pull rope.

[0008] Preferably, a waterproof light source is arranged in the device for irradiating the coral-like prosthesis.

[0009] Preferably, the elastic rope net 47 is in a spiral shape.

[0010] As another aspect of the present application, the present application provides a sea area layout method for catching long-spined sea star, which is: setting an artificial coral reef area near a coral area, setting a temporary protection net on the periphery of the coral area, setting a temporary escape prevention net on the periphery of the artificial coral reef area, and setting a guide pipe between the coral area and the artificial coral reef area, so that the long-spined sea star can enter the artificial coral reef area from the coral area through the guide pipe.

[0011] Preferably, the two ends of the guide pipe respectively penetrate the temporary protection net and the temporary escape prevention net.

[0012] Preferably, the water delivery pipeline delivers the purified tail water of shellfish culture into the coral area.

[0013] Preferably, the temporary escape prevention net comprises a vertical part above the sea bottom and a flat part below the sea bottom.

[0014] As another aspect of the present application, the present application provides an evaluation method for catching long-spined sea star, which is: placing a plurality of devices for catching long-spined sea star uniformly inside the coral area, counting the average catch quantity X in the devices in the area, the average catch quantity Y in the devices in the artificial coral reef area, and the average catch quantity Z outside the devices in the artificial coral reef area, calculating the proportion of each catch quantity to the average outbreak quantity M of long-spined sea star in historical fishery resource investigation, and obtaining the catch effect of the device for catching long-spined sea star.

[0015] The beneficial effects of the present application are as follows:

[0016] The present application can concentrate on catching long-spined sea star during the outbreak of long-spined sea star, avoid catching fish, shrimp, crab and other aquatic animals in the sea area, and evaluate the catch effect, which has obvious significance for fishery ecological control and restoration. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole schematic diagram of a device for catching long-spined sea star according to the present application;

[0018] Figure 2 It is a schematic diagram of a coral prosthesis structure of a device for catching long-spined sea star according to the present application;

[0019] Figure 3 It is a schematic diagram of elastic rope net setting of a device for catching long-spined sea star according to the present application;

[0020] Figure 4 It is a whole schematic diagram of a sea area layout scheme for catching long-spined sea star according to the present application;

[0021] Figure 5 It is a schematic diagram of setting of a temporary escape prevention net in a sea area layout scheme for catching long-spined sea star according to the present application;

[0022] Figure 6 Another setting diagram of temporary escape prevention net in the sea area layout scheme for long-spined sea star fishing according to the present application;

[0023] Figure 7 Frame structure diagram of the device for fishing long-spined sea star according to the present application. DETAILED DESCRIPTION

[0024] For the purpose, technical scheme and advantages of the present application, the present application will be further described below in combination with specific embodiments.

[0025] Embodiment 1

[0026] The present application provides a device for fishing long-spined sea star, which comprises a framework 1, a net 2 with a reserved entrance arranged inside the framework 1, and the entire device is in the form of a frame with the net tightly fixed inside, the entrance is arranged at the side near the bottom, the net at the entrance has a reserved mesh, and the opening and closing are realized through a contraction opening. The inside of the framework 1 is a containing space, and a coral-like prosthesis 4 is arranged in the containing space to attract long-spined sea star into the net cage, thereby realizing the capture. In use, the device is placed in the coral area or an area within 1 meter in diameter from the coral area, and the long-spined sea star can climb onto the coral-like prosthesis 4 in the cage after seeing it. Preferably, the coral-like prosthesis 4 is detachably connected with the bottom of the device, after fishing the sea star, the coral-like prosthesis 4 can be directly taken out without separation, and the long-spined sea star can be dried together. Figures 1-4 Further, a wave-attached plate 41 is arranged around the coral-like prosthesis 4, the wave-attached plate 41 has benthic animals and algae, and the algae is preferably a single phytoplankton species preferred by sea star for feeding, and the benthic animals and algae are used to attract the sea star to approach for feeding. Preferably, the wave-attached plate 41 is suspended above the coral-like prosthesis 4, and a waterproof light source 42 is arranged on the side of the wave-attached plate 41 facing the coral-like prosthesis 4, when the water body is deep or at night, the waterproof light source 42 can illuminate the outline of the coral-like prosthesis 4, thereby facilitating the induction of the sea star. The waterproof light source 42 can be self-powered.

[0027]

[0028] ​Further, the surface of the coral-like prosthesis 4 is distributed with arc-shaped half-rings 43, and the arc-shaped half-rings 43 reproduce the rough surface morphology of corals, facilitating the spines of starfish to climb when the starfish moves on the surface. Preferably, the surface of the coral-like prosthesis 4 corresponding to the arc-shaped half-rings 43 forms an opening 44, the inner edge of the opening 44 is provided with a first silica gel 45, the inner surface of the arc-shaped half-ring 43 is provided with a second silica gel 46, and the first silica gel 45 and the second silica gel 46 are connected by an elastic rope net 47. When the spines of the starfish enter the area between the arc-shaped half-rings 43 and the opening 44, the elastic rope net 47 is entangled with the spines of the starfish, limiting the movement of the starfish, achieving capture and fixation. Preferably, the elastic rope net 47 is in a spiral shape.

[0029] Embodiment 2

[0030] When the long-spined sea star grows, it moves to the coral area and on the coral and feeds. In order to realize the concentrated capture of the long-spined sea star, the present embodiment provides a sea area layout for capturing the long-spined sea star, as shown in Figures 5-6 , wherein the sea area layout scheme for capturing the long-spined sea star is to set an artificial coral reef area 5 near the coral area 10, set a temporary protection net 8 on the periphery of the coral area 10, set a temporary escape prevention net 9 on the periphery of the artificial coral reef area 5, and set a guide pipe 7 between the coral area 10 and the artificial coral reef area 5, so that the long-spined sea star can enter the artificial coral reef area 5 from the coral area through the guide pipe 7. Preferably, the two ends of the guide pipe 7 penetrate through the temporary protection net 8 and the temporary escape prevention net 9 respectively, are in an open state, are connected with the coral area 10 and the artificial coral reef area 5 respectively, the inside of the guide pipe 7 is coated with a certain amount of attractant pheromone, which is released into the system under the scouring of water flow when in use, and the surface of the coral-like prosthesis 4 in the capture device in the artificial coral reef area 5 is also coated with the attractant pheromone in advance, so as to induce the long-spined sea star to migrate and concentrate into the capture device. The water delivery pipeline 6 delivers the shellfish culture purification tail water into the coral area 10, and the shellfish culture purification tail water is preferably the culture and purification wastewater of conch, oyster, apple snail, etc. Preferably, there is a certain distance between the water outlet of the water delivery pipeline 6 in the coral area 10 and the opening of the guide pipe 7, so as to realize the migration of the long-spined sea star into the guide pipe 7. Preferably, multiple guide pipes 7 can be arranged in a relatively close area.

[0031] Further, the artificial coral reef area 5 is composed of a plurality of artificial coral reefs 51, a plurality of devices for capturing the long-spined sea star in embodiment 1 are placed in the gaps between the artificial coral reefs 51, and the long-spined sea star is concentratedly captured in the artificial coral reef area 5. The temporary escape prevention net 9 is buried on the periphery of the artificial coral reef area 5, and the height of the temporary escape prevention net 9 above the sea bed is higher than that of the artificial coral reef 51, so as to ensure that the long-spined sea star stays inside the artificial coral reef area 5. The temporary escape prevention net 9 is supported by a plurality of support rods and the like stick bodies.

[0032] In order to realize the centralized fishing, the two ends of the temporary escape-proof net 9 are higher than the sea bottom, and the middle part is buried in the area at the bottom of the sea bottom, so that the artificial coral reef area 5 can be fully and centrally fished. Specifically, the temporary escape-proof net 9 includes a vertical part 91 above the sea bottom and a flat part 92 below the sea bottom, the net part of the vertical part 91 and the flat part 92 is integrally formed, the flat part 92 is filled with bottom mud, and the vertical part 91 is supported by a supporting rod or the like stick. Since the artificial coral reef area 5 has both the artificial coral reef 51 and the device for fishing the long-spined sea star, the volume of the artificial coral reef area 5 is generally large and heavy, and therefore, as a preferred solution, the temporary escape-proof net 9 further includes a connecting part 93, the net part of the vertical part 91 above the sea bottom and the flat part 92 below the sea bottom is integrally formed into a long strip shape and laid in the area of the artificial coral reef area 5 other than the artificial coral reef 51, at this time, the device for fishing the long-spined sea star is placed above the flat part 92, and the vertical parts 91 are connected by the connecting part 93 to close the periphery of the artificial coral reef area 5. The vertical part 91, the flat part 92 and the connecting part 93 are all net sheet structures composed of net and framework, and can be connected by binding.

[0033] Further, a plurality of devices for fishing the long-spined sea star are also uniformly placed in the coral area 10 to fish the long-spined sea star that has not entered the guide pipe 7. The fishing quantities X in the devices in the area, the fishing quantities Y in the devices in the artificial coral reef area 5 and the fishing quantities Z outside the fishing devices in the artificial coral reef area 5 (such as including the artificial coral reef 51 and the temporary escape-proof net 9) are counted, and according to the average outbreak amount M of the long-spined sea star in the historical fishery resource investigation, the proportion relationship of each fishing quantity to the average outbreak amount M is calculated, so that the fishing effect of the device for fishing the long-spined sea star can be obtained.

[0034] Specifically, the relationship between X+Y+Z and M is compared to determine the relationship between the overall capture effect and the outbreak amount.

[0035] The values of X / M, Y / M and Z / M are calculated to obtain the migration distribution of the long-spined sea star under the overall fishing method.

[0036] Embodiment 3

[0037] In order to avoid fishing fish, shrimps, crabs and other aquatic animals in the sea area, an opening 3 is arranged at the upper part of the device for fishing the long-spined sea star, so as to facilitate the fish, shrimps, crabs and other aquatic animals to leave.

[0038] In order to consider the daily transportation and use, a device for fishing the long-spined sea star in the present application includes a framework 1, a net 2 with a reserved entrance arranged outside the framework 1, the entire device is in the form of a frame body with the net outside, and the frame body is provided with an opening for facilitating water permeation.

[0039] Finally, it should be noted that the above examples are merely intended to illustrate the technical solutions of the present application and not to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A device for catching long-spined sea urchins, characterised in that: The device comprises a framework, a netting with a reserved entrance arranged outside the framework, a containing space arranged inside the framework, a coral-like prosthesis arranged in the containing space, an arc-shaped half ring distributed on the surface of the coral-like prosthesis, an opening formed on the surface of the coral-like prosthesis corresponding to the arc-shaped half ring, a first silica gel arranged on the inner edge of the opening, a second silica gel arranged on the inner surface of the arc-shaped half ring, the first silica gel and the second silica gel connected through an elastic rope net, the elastic rope net in a spiral shape, the elastic rope net and the sea star spiny process entangled when the sea star spiny process enters the area between the arc-shaped half ring and the opening, the movement of the sea star limited, the capturing and fixing realized, the upper part of the coral-like prosthesis connected with the framework through an elastic pull rope, an attached corrugated plate suspended above the coral-like prosthesis, benthic animals and algae on the attached corrugated plate, the benthic animals and algae used to attract the sea star to approach for feeding, a waterproof light source arranged in the device for irradiating the coral-like prosthesis, and an opening arranged on the upper part of the device.

2. A method of assessing the fishing effect of a device for catching long-spined sea urchins, characterized in that: An artificial coral reef area is arranged near the coral area, the artificial coral reef area is composed of a plurality of artificial coral reefs, a plurality of devices for capturing long-spined sea stars in claim 1 are evenly placed in the coral area, a plurality of devices for capturing long-spined sea stars in claim 1 are placed in the gaps between the artificial coral reefs, the long-spined sea stars are concentratedly captured in the artificial coral reef area, a temporary protection net is arranged on the periphery of the coral area, a temporary escape prevention net is arranged on the periphery of the artificial coral reef area, the height of the temporary escape prevention net above the sea bottom is higher than that of the artificial coral reef, so as to ensure that the long-spined sea stars stay inside the artificial coral reef area, shellfish culture purification tail water is transported into the coral area through a water delivery pipeline, a guide pipe is arranged between the coral area and the artificial coral reef area, the long-spined sea stars can enter the artificial coral reef area from the coral area through the guide pipe, and the two ends of the guide pipe penetrate the temporary protection net and the temporary escape prevention net, respectively; The average capture quantity X in the coral area, the average capture quantity Y in the artificial coral reef area, and the average capture quantity Z outside the artificial coral reef area are counted, the relationship between X+Y+Z and M is compared according to the average outbreak quantity M of the long-spined sea stars in the historical fishery resource investigation, the relationship between the overall capture effect and the outbreak quantity is judged, the values of X / M, Y / M and Z / M are calculated, the migration distribution of the long-spined sea stars under the overall capture method is obtained, and the capture effect of the device for capturing long-spined sea stars is obtained.

3. The method for evaluating the catching effect of the apparatus for catching long-spined sea star according to claim 2, characterized in that: The temporary escape prevention net comprises a vertical part above the sea bottom and a flat part below the sea bottom.

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