CN112021213A - Wenchang fish habitat desliming appliance - Google Patents
Wenchang fish habitat desliming appliance Download PDFInfo
- Publication number
- CN112021213A CN112021213A CN202010591078.0A CN202010591078A CN112021213A CN 112021213 A CN112021213 A CN 112021213A CN 202010591078 A CN202010591078 A CN 202010591078A CN 112021213 A CN112021213 A CN 112021213A
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- China
- Prior art keywords
- rod
- traction
- habitat
- long
- amphioxus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 241000251468 Actinopterygii Species 0.000 title description 2
- 241000251522 Cephalochordata Species 0.000 claims abstract description 25
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 241000251534 Branchiostoma Species 0.000 claims abstract description 7
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 230000002787 reinforcement Effects 0.000 claims 3
- 239000010802 sludge Substances 0.000 claims 3
- 239000004576 sand Substances 0.000 abstract description 16
- 241000251537 Branchiostoma belcheri Species 0.000 abstract description 5
- 230000035699 permeability Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 18
- 235000015170 shellfish Nutrition 0.000 description 9
- 239000013049 sediment Substances 0.000 description 8
- 230000005484 gravity Effects 0.000 description 5
- 241000237519 Bivalvia Species 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 235000020639 clam Nutrition 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 241000251556 Chordata Species 0.000 description 1
- 241000251539 Vertebrata <Metazoa> Species 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/10—Culture of aquatic animals of fish
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K80/00—Harvesting oysters, mussels, sponges or the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Marine Sciences & Fisheries (AREA)
- Zoology (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention provides a mud removal tool for a branchiostoma belcheri habitat, which comprises a long harrow nail row, wherein the long harrow nail row comprises a cross rod and a plurality of harrow nails which are arranged on the cross rod and uniformly arranged in the same direction; the drag rod is perpendicular to the cross rod and the drag nails, and the drag rods are arranged at two ends of the cross rod; one end, far away from the cross rod, of the traction rod is rotatably connected with a traction swivel, a traction rope is fixed on the traction swivel, one end, far away from the traction swivel, of the traction rope is fixedly connected with a traction boat, and the traction boat is used for dragging the long rake nail row to move; and the long brag nail palladium is also fixed with a balancing weight, so that the long brag nail row sinks into the seabed of the branchiostoma habitat. By applying the technical scheme, the content of muddy substances in the sand layer of the habitat of the amphioxus can be reduced, the air permeability and the porosity of the sand layer of the silt are improved, and the ecological environment of the habitat of the amphioxus is improved.
Description
Technical Field
The invention relates to the field of ecological environment improvement, in particular to a mud removal tool for a branchiostoma belcheri habitat.
Background
The amphioxus belongs to chordate, is a transition type from invertebrate to vertebrate evolution, and is an 'activating stone' with important academic research value. The branchiostoma belonged to inhabit and live on the surface of a clean seabed sand layer with the depth of 1 to 10 centimeters, the sand is required to be loose and have good air permeability, if the sand layer is hardened and blacked and smelly due to the serious deposition of organic matters and inorganic soil on the sand layer of the branchiostoma belonged land, the ecological environment suitable for the branchiostoma belonged to inhabit and live is destroyed, and the branchiostoma colonies are gradually degraded and killed.
With the increasing influence of human production and life on the ecological environment of a marine domain and the increasing argillization of the habitat of the amphioxus, the situation that the precious amphioxus flora resources disappear can be avoided only by researching and adopting some manual intervention measures to repair the habitat of the amphioxus, but the habitat repair should adhere to the principle of 'minimum manual intervention'. The tool is specially designed and manufactured for solving the problem of special habitat restoration of the amphioxes according to the principle of habitat restoration of minimum human intervention, and the tool is used for habitat restoration operation to hopefully suppress the increasingly serious tendency of the habitat mud of the amphioxes in a short time without worrying about the practical or potential adverse effects on the population life of the amphioxes.
Disclosure of Invention
The invention aims to provide a mud removal tool for a branchiostoma belcheri habitat, which can reduce the content of mud materials in a sand layer of the branchiostoma belcheri habitat, improve the air permeability and the porosity of the sand layer and improve the ecological environment of the branchiostoma belcheri habitat.
In order to solve the technical problem, the invention provides a mud removal tool for the habitat of the amphioxus, which comprises a long harrow nail row, wherein the long harrow nail row comprises a cross rod and a plurality of harrow nails which are arranged on the cross rod and uniformly arranged in the same direction; the drag rod is perpendicular to the cross rod and the drag nails, and the drag rods are arranged at two ends of the cross rod; one end, far away from the cross rod, of the traction rod is rotatably connected with a traction swivel, a traction rope is fixed on the traction swivel, one end, far away from the traction swivel, of the traction rope is fixedly connected with a traction boat, and the traction boat is used for dragging the long rake nail row to move; and the long brag nail palladium is also fixed with a balancing weight, so that the long brag nail row sinks into the seabed of the branchiostoma habitat.
In a preferred embodiment, the rake nails are embodied as spike-shaped end rake nails.
In a preferred embodiment, the device further comprises a collecting net; a rectangular metal frame is fixed at an opening of the collecting net; the rectangular metal frame is fixed on the long rake nail row.
In a preferred embodiment, the long rake nail row further comprises a reinforcing rod and a connecting rod, and two ends of the reinforcing rod are respectively fixedly connected with the cross rod and the traction rod to form a reinforcing inclined rod; a fixed rod is arranged on the reinforcing rod along a direction perpendicular to the plane of the cross rod, the traction rod and the reinforcing rod; the both ends fixed connection of connecting rod set up in the dead lever at horizontal pole both ends makes the connecting rod with a section distance of horizontal pole interval and with horizontal pole parallel arrangement each other.
In a preferred embodiment, the long side of the rectangular metal frame and the connecting rod are mutually attached and fixed.
In a preferred embodiment, the fixing rods include a first fixing rod and a second fixing rod, and the first fixing rod and the second fixing rod are respectively provided with two ends of the reinforcing rod; the long edge of the rectangular metal frame is fixedly connected with the first fixing rod.
In a preferred embodiment, the weight member is fixedly disposed between the first fixing rod and the second fixing rod.
In a preferred embodiment, a third fixing rod is further disposed between the first fixing rod and the second fixing rod, a fixing screw hole is disposed in the middle of the counterweight, and the counterweight is fixedly connected to the reinforcing rod by connecting the fixing screw hole to the third fixing rod.
In a preferred embodiment, the device further comprises a placement rod; the article placing rod and the cross rod are parallel to each other and are spaced by a certain distance; the two ends of the object placing rod are respectively and fixedly connected with the traction rod; an underwater camera and an underwater illuminating lamp are arranged on the object placing rod.
In a preferred embodiment, the traction swivel is specifically a U-shaped ring, two ends of the U-shaped ring are provided with connecting holes, and two ends of the traction rod are provided with connecting matching holes; the U-shaped ring is rotatably connected with the traction rod by inserting the rotating pin into the connecting hole and the connecting matching hole.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention provides a mud removal operation tool for a field inhabited by amphioxus, which is dragged and dragged by a small-sized power ship with shallow draft, harrow nails are inserted into a sediment layer at the sea bottom to break the caking of a sediment plate, the sediment on the surface layer is disturbed and raised, the mud is separated from muddy objects and sinks quickly after being raised by stirring because the specific gravity of the sand is far greater than that of water, and the muddy objects are suspended in the water for a long time because the specific gravity is close to seawater after being raised by stirring, migrate, diffuse and re-sink to an open sea area along with ebb flow and are far away from a near-shore shallow sea area where the amphioxus inhabit lives, so that the content of the muddy objects on the sand layer of the field inhabited by the amphioxus is reduced, the air permeability and the porosity of the sediment layer are improved, and the ecological environment of the field inhabited by the amphioxus. Shellfish such as clams growing in the sand layer of the habitat of the amphioxes compete with the amphioxes for living space and bait, and excrement of the shellfish and the amphioxes aggravate the phenomenon of organic matter deposition and argillization of the habitat, so that measures are necessary to control the biomass of benthic shellfish such as clams in the habitat of the amphioxes. The caking silt rolling into the net bag can be broken in the dragging process and then returns to the sea again through the meshes.
Drawings
FIG. 1 is a front view of a desliming tool for the habitat of amphioxus in a preferred embodiment of the present invention;
FIG. 2 is a top view of the apparatus for desilting the habitat of amphioxus in the preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
An apparatus for removing mud from the habitat of amphioxus, referring to fig. 1 to 2, comprises a long row of branchings, wherein the long row of branchings comprises a cross bar 3 and a plurality of branchings 1 which are uniformly arranged on the cross bar 3 in the same direction, and in this embodiment, the distance between the branchings 1 is 1.3 cm; the drag rod 4 is perpendicular to the cross rod 3 and the harrow nails 1, and the drag rod 4 is arranged at each of two ends of the cross rod 3; a traction swivel is rotatably connected to one end, far away from the cross rod 3, of the traction rod 4, a traction rope is fixed to the traction swivel, in the embodiment, the traction swivel is specifically a U-shaped ring 5, connecting holes are formed in two ends of the U-shaped ring 5, and connecting matching holes are formed in two ends of the traction rod 4; the U-shaped ring 5 is rotatably connected with the traction rod 4 by inserting a rotating pin into the connecting hole and the connecting matching hole. One end of the traction rope, which is far away from the traction swivel, is fixedly connected with a dragging boat, and the dragging boat is used for dragging the long rake nail row to move; and a clump weight is also fixed on the palladium of the long branchings 1, so that the long branchings are sunk into the seabed of the habitat of the amphioxus, and the branchings 1 are pricked into the seabed silt sand layer to be 3-8 cm deep. In this embodiment, the rake nails 1 are specifically rake nails 1 with sharp tooth-shaped ends, so that the rake nails 1 can be conveniently pricked into a muddy sand layer on the seabed.
Shellfish such as clams growing in the sand layer of the habitat of the amphioxes compete with the amphioxes for living space and bait, and excrement of the shellfish aggravates the phenomenon of organic matter deposition and argillization of the habitat, so that measures are necessary to be taken to control the biomass of benthic shellfish such as clams in the habitat of the amphioxes, and the collection net 2 is further included; a rectangular metal frame is fixed at an opening of the collecting net 2; the rectangular metal frame is fixed on the long rake nail row. The openings of the collecting net 2 are used for collecting shellfish creatures. When the rows of the braks 1 loosen the silt layer, shellfish organisms which are raked up and rolled into the net opening can be collected into the net, so that a part of mature shellfish individuals can be removed. The caking silt rolling into the net bag can be broken in the dragging process and then returns to the sea again through the meshes.
Specifically, the long rake nail row further comprises a reinforcing rod 9 and a connecting rod, wherein two ends of the reinforcing rod 9 are respectively and fixedly connected with the cross rod 3 and the traction rod 4 to form a reinforcing inclined rod; a fixing rod is arranged on the reinforcing rod 9 along a direction perpendicular to the plane where the cross rod 3, the traction rod 4 and the reinforcing rod 9 are located; the both ends fixed connection of connecting rod set up in the dead lever at 3 both ends of horizontal pole makes the connecting rod with 3 intervals of horizontal pole a section distance and with horizontal pole 3 mutual parallel arrangement. The long edge of the rectangular metal frame is fixedly attached to the connecting rod.
Specifically, the fixing rods include a first fixing rod and a second fixing rod, and the first fixing rod and the second fixing rod are respectively provided with two ends of the reinforcing rod 9; the long edge of the rectangular metal frame is fixedly connected with the first fixing rod. The weight block 10 is fixedly disposed between the first fixing rod and the second fixing rod. A third fixing rod is further arranged between the first fixing rod and the second fixing rod, a fixing screw hole is formed in the middle of the balancing weight 10, and the balancing weight 10 is fixedly connected to the reinforcing rod 9 through the fixing screw hole and the third fixing rod. The weight 10 is a single iron block or lead block with the diameter of 160mm and the height of 100mm, the center of the cylinder is provided with a through hole, the weight of the single iron block or lead block is about 15 kg, and the single weight is fixed on the reinforcing rods 9 at the left end and the right end through screws to increase the gravity of the harrow body, so that the harrow nails 1 can be easily pricked into a sediment layer of the sea bottom. The counterweight can be adjusted according to the actual needs of the site.
Particularly, the utility model also comprises a placing rod 6; the article placing rod 6 and the cross rod 3 are parallel to each other and are spaced at a certain distance; two ends of the article placing rod 6 are respectively and fixedly connected with the traction rod 4; an underwater camera 7 and an underwater illuminating lamp 8 are arranged on the object placing rod 6. The real-time underwater camera 7 is underwater close-range camera equipment, is fixed on a strong framework of a harrow body, is specifically connected with video and display and information storage equipment on a dragging ship through a special data cable at a position 500mm in front of the harrow body, and can observe the conditions of the posture of a special tool on the seabed, the depth of the harrow nail 1 inserted into a sediment layer and the like in real time and acquire video information of the motion of the special tool on the seabed during operation according to needs. The underwater illuminating lamp 8 is an underwater illuminating lamp 8 with waterproof sealing performance, is fixed on a harrow body strengthening frame, and particularly illuminates 1 row of harrow nails in front of a camera at the position 500mm in front of the harrow body, so that an auxiliary light source is provided for real-time observation and camera work, and the image pick-up definition is improved.
The invention provides a mud removal operation tool for a field inhabited by amphioxus, which is dragged by a small-sized power ship with shallow draft, wherein a nail 1 is inserted into a sediment layer at sea bottom, so as to break the caking of the sediment plate, disturb and raise the surface layer silt, and separate and sink the muddy object quickly after being raised due to the fact that the specific gravity of the silt is far greater than that of water, and the muddy object is suspended in the water for a long time due to the fact that the specific gravity is close to seawater after being raised, migrates, diffuses with the ebb flow and re-sinks to an open sea area and is far away from a near-shore shallow sea area where the amphioxus inhabit lives, so that the content of the muddy object on the sand layer of the field inhabited by the amphioxus is reduced, the air permeability and the porosity of the silt sand layer are improved, and the ecological environment of the field inhabited by the amphiox.
The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.
Claims (10)
1. The mud removal tool for the amphioxus habitat is characterized by comprising a long rake nail row, wherein the long rake nail row comprises a cross rod and a plurality of rake nails which are arranged on the cross rod and uniformly arranged in the same direction; the drag rod is perpendicular to the cross rod and the drag nails, and the drag rods are arranged at two ends of the cross rod; one end, far away from the cross rod, of the traction rod is rotatably connected with a traction swivel, a traction rope is fixed on the traction swivel, one end, far away from the traction swivel, of the traction rope is fixedly connected with a traction boat, and the traction boat is used for dragging the long rake nail row to move; and the long brag nail palladium is also fixed with a balancing weight, so that the long brag nail row sinks into the seabed of the branchiostoma habitat.
2. The apparatus for desilting the habitat of amphioxus according to claim 1, wherein the braw nails are specifically spike-shaped braw nails.
3. The amphioxus habitat desliming tool of claim 2, further comprising a collection net; a rectangular metal frame is fixed at an opening of the collecting net; the rectangular metal frame is fixed on the long rake nail row.
4. The apparatus as claimed in claim 3, wherein the rows of long harrows further comprise a reinforcement bar and a connecting bar, and both ends of the reinforcement bar are respectively fixedly connected with the cross bar and the traction bar to form a reinforcement diagonal bar; a fixed rod is arranged on the reinforcing rod along a direction perpendicular to the plane of the cross rod, the traction rod and the reinforcing rod; the both ends fixed connection of connecting rod set up in the dead lever at horizontal pole both ends makes the connecting rod with a section distance of horizontal pole interval and with horizontal pole parallel arrangement each other.
5. The apparatus for removing sludge from the habitat of amphioxus of claim 4, wherein the long side of the rectangular metal frame and the connecting rod are fixed to each other in a fitting manner.
6. The apparatus for removing sludge from habitat of amphioxus of claim 5, wherein the fixing rod comprises a first fixing rod and a second fixing rod, the first fixing rod and the second fixing rod are respectively provided with two ends of the reinforcing rod; the long edge of the rectangular metal frame is fixedly connected with the first fixing rod.
7. The apparatus as claimed in claim 6, wherein the weight member is fixedly disposed between the first and second fixing rods.
8. The apparatus as claimed in claim 7, wherein a third fixing rod is provided between the first fixing rod and the second fixing rod, a fixing screw hole is provided in the middle of the weight member, and the weight member is fixedly connected to the reinforcing rod by the connection of the fixing screw hole and the third fixing rod.
9. The apparatus for desilting the habitat of amphioxus according to claim 7, further comprising a placement rod; the article placing rod and the cross rod are parallel to each other and are spaced by a certain distance; the two ends of the object placing rod are respectively and fixedly connected with the traction rod; an underwater camera and an underwater illuminating lamp are arranged on the object placing rod.
10. The apparatus for removing sludge from the habitat of amphioxus according to any one of claims 1 to 9, wherein the traction swivel is a U-shaped ring, connecting holes are formed at two ends of the U-shaped ring, and connecting matching holes are formed at two ends of the traction bar; the U-shaped ring is rotatably connected with the traction rod by inserting the rotating pin into the connecting hole and the connecting matching hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010591078.0A CN112021213A (en) | 2020-06-24 | 2020-06-24 | Wenchang fish habitat desliming appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010591078.0A CN112021213A (en) | 2020-06-24 | 2020-06-24 | Wenchang fish habitat desliming appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112021213A true CN112021213A (en) | 2020-12-04 |
Family
ID=73578895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010591078.0A Pending CN112021213A (en) | 2020-06-24 | 2020-06-24 | Wenchang fish habitat desliming appliance |
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| Country | Link |
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| CN (1) | CN112021213A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2093322A (en) * | 1981-02-24 | 1982-09-02 | Metal Enterprises Ltd | Fishing dredge |
| KR200197668Y1 (en) * | 2000-04-04 | 2000-09-15 | 박정건 | Improvement mathine for soil of the sea-bed |
| KR100722318B1 (en) * | 2006-04-14 | 2007-05-28 | 국성종합건설(주) | Device for purifying and repairing deposit or underwatet bottom |
| KR20090127105A (en) * | 2009-09-09 | 2009-12-09 | 강중환 | Apparatus for picking shellfish |
| WO2011031075A2 (en) * | 2009-09-09 | 2011-03-17 | Kang Jung Hwan | Underwater dredge for gathering shellfish |
| CN212325118U (en) * | 2020-06-24 | 2021-01-12 | 自然资源部第三海洋研究所 | Mud removing appliance for branchiostoma belcheri habitat |
-
2020
- 2020-06-24 CN CN202010591078.0A patent/CN112021213A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2093322A (en) * | 1981-02-24 | 1982-09-02 | Metal Enterprises Ltd | Fishing dredge |
| KR200197668Y1 (en) * | 2000-04-04 | 2000-09-15 | 박정건 | Improvement mathine for soil of the sea-bed |
| KR100722318B1 (en) * | 2006-04-14 | 2007-05-28 | 국성종합건설(주) | Device for purifying and repairing deposit or underwatet bottom |
| KR20090127105A (en) * | 2009-09-09 | 2009-12-09 | 강중환 | Apparatus for picking shellfish |
| WO2011031075A2 (en) * | 2009-09-09 | 2011-03-17 | Kang Jung Hwan | Underwater dredge for gathering shellfish |
| CN212325118U (en) * | 2020-06-24 | 2021-01-12 | 自然资源部第三海洋研究所 | Mud removing appliance for branchiostoma belcheri habitat |
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