CN210341841U - Deep water net paper tinsel device of guarantee fish gathering effect - Google Patents
Deep water net paper tinsel device of guarantee fish gathering effect Download PDFInfo
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- CN210341841U CN210341841U CN201920341414.9U CN201920341414U CN210341841U CN 210341841 U CN210341841 U CN 210341841U CN 201920341414 U CN201920341414 U CN 201920341414U CN 210341841 U CN210341841 U CN 210341841U
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Abstract
The utility model belongs to the technical field of fishery, and relates to a deepwater net foil device for guaranteeing fish collection effect, which comprises an offshore net foil belt, an offshore block net and an offshore block net; the bank-approaching block net is connected with the bank-approaching net foil strip; the offshore barrier is connected with the offshore net foil strip; the shore block is opposite to the offshore block and is arranged asymmetrically; the shore net foil belt and the offshore net foil belt are arranged in parallel, and a fish passing channel is formed between the shore net foil belt and the offshore net foil belt; the fish passing channel is internally provided with a plurality of net doors, and the height of the plurality of net doors is lifted in sequence along the advancing direction of the fish school. The utility model provides a deep water net paper tinsel device of guarantee fishing effect that safe and reliable, with low costs, easy installation, convenient to use, adjustable range are big, fish luring are efficient.
Description
Technical Field
The utility model belongs to the technical field of the fishery, a net class fishing device is related to, especially relate to a deep water net paper tinsel device of guarantee collection fish effect.
Background
At present, the development process of water resources in China is accelerated continuously, various dams and hydropower stations are built continuously like bamboo shoots in spring after rain, and the scale is enlarged continuously. The construction of water conservancy and hydropower engineering blocks the connectivity of rivers, influences the migration of fishes and destroys the habitat of the fishes. In order to protect fish germplasm resources and relieve the deterioration of river ecological environment, protective measures such as a fishway, a fish elevator, a fish ladder, a transport ship and the like are required to be equipped while a dam and a hydroelectric facility are built, so that the fishes are helped to reach living places such as breeding places, cable bait fields, overwintering fields and the like. Different transfer measures can be taken for dams with different elevations, and a high-head dam needs to be transported cooperatively by a gathering and transporting fish boat, a fish way and the like in the fish transferring process.
How to lure and collect fish is a key problem in the using process of the fish collecting and transporting ship. Traditional fish luring measures are mainly carried out by utilizing external factors (such as sound, light, bubbles and the like), and although certain effects are obtained, some fish luring measures have high cost, some techniques are complex, some fish luring measures are inconvenient to use, some fish guiding effects are poor, and the like. Some fish luring facilities are fish guiding nets and fish guiding grids, however, the fish guiding nets are not easy to fix in water and have poor stability, and the fish guiding grids are not easy to install and fix and have high cost. The fishing operation is also carried out by using the net foil. The common net foil is in a symmetrical inverted-eight shape, the structure of the net foil is shown in figure 1, the net foil comprises a wing net, a central stiff net, a lie net, a large-wheel net, a floater, accessories and the like, generally, four net door inlets are symmetrically distributed up and down, left and right, and a plurality of gates are arranged. The net blocking facilities of the net foil are symmetrically distributed, the fish blocking surface is relatively small, the angle of the net blocking is large, the stability of the net blocking in a water body is poor, in addition, net doors are connected with the net blocking, the net doors of common net foils are between 20-40 pieces, the height and the width of each net door are inconsistent, the specification of the net doors is continuously reduced from the first net door to the last net door, and the net doors present a horn shape, so that the fish passing efficiency is low, and the escape prevention rate of fish collection is low. Therefore, the search for a fish luring method with better effect, convenient use and low cost is a problem to be solved by many scholars in recent years.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem existing in the background art, the utility model provides a safe and reliable, with low costs, easy installation, convenient to use, adjustable range are big, lure the efficient deep water net paper tinsel device of guarantee fishing effect of fish.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a guarantee deep water net paper tinsel device of fish-gathering effect which characterized in that: the deepwater net foil device for guaranteeing the fish collecting effect comprises an offshore net foil belt, an offshore block net and an offshore block net; the shore blocking net is connected with the shore net foil strip; the offshore barrier is connected to an offshore foil strip; the shore block is opposite to the offshore block and is arranged asymmetrically; the shore net foil belt and the offshore net foil belt are arranged in parallel, and a fish passing channel is formed between the shore net foil belt and the offshore net foil belt; the fish passing channel is internally provided with a plurality of net doors, and the height of the plurality of net doors is lifted in sequence along the advancing direction of fish school.
Preferably, the length of the offshore block used in the present invention is greater than the length of the onshore block; the included angle between the shore-approaching block and the cross section of the river and the included angle between the offshore block and the cross section of the river are both 60-70 degrees.
Preferably, the included angle between the shore block and the cross section of the river is larger than the included angle between the offshore block and the cross section of the river.
Preferably, the included angle between the shore blocking net and the offshore blocking net adopted by the utility model is not more than 30 degrees; the intersection between the shore block and the offshore block is placed in the fish passage.
Preferably, the intersection between the shore net and the offshore net used in the present invention is placed at the gate of the fish passage.
Preferably, the fish passing channel adopted by the utility model is sequentially provided with a first net gate, a second net gate and a third net gate along the advancing direction of the fish school; and the heights of the first net door, the second net door and the third net door are sequentially lifted.
Preferably, the width of the first net door and the width of the second net door adopted by the utility model are L1; the width of the third net door is L2; the L1 is more than L2.
Preferably, the net structures of the shore block and the offshore block adopted by the utility model are the same, and both comprise the block; the height of the barrier net is not more than 8.5 m; the side length of meshes of the barrier net is not more than 2.5 cm; the barrier net is formed by weaving net wires made of polyethylene fibers, the specification of the net wires is 250D-380D/4-1200 strands, and the breaking strength is 7.5 g/D; the rope of the barrier net is made of polyethylene fiber materials, the diameter of the rope is 30mm, and the rope is arranged on the head line and the foot line of the barrier net; the horizontal shrinkage factor ET of the barrier net is 0.6, and the vertical shrinkage factor EN is 0.8.
Preferably, the deepwater net foil device for guaranteeing the fish gathering effect further comprises a net foil fixing device; the net foil fixing device comprises a mooring bollard, a floating drum and a negative pressure anchor; the floating drums are arranged on the top of the shore net foil strip, the top of the offshore net foil strip, the top of the shore blocking net and the top of the offshore blocking net; the negative pressure anchor is arranged at the bottom of the shore net foil strip, the bottom of the offshore net foil strip, the bottom of the shore block and the bottom of the offshore block; the mooring bollards are arranged on the shore and are respectively connected with the shore net foil belt and the offshore net foil belt.
Preferably, the negative pressure anchors adopted by the utility model are multiple, and the distance between two adjacent negative pressure anchors is not more than 10 m; the floating drum is respectively connected with the top of the shore net foil strip, the top of the offshore net foil strip, the top of the shore blocking net and the top of the offshore blocking net through fiber ropes; the bollard is connected with the shore net foil belt through a fiber rope.
The utility model has the advantages that:
the utility model provides a deepwater net foil device for guaranteeing the fish collecting effect, aiming at trapping fishes living in different water layers and improving the fish collecting efficiency, comprising an on-shore net foil belt, an offshore net foil belt, an on-shore block net and an offshore block net; the bank-approaching block net is connected with the bank-approaching net foil strip; the offshore barrier is connected with the offshore net foil strip; the shore block is opposite to the offshore block and is arranged asymmetrically; the shore net foil belt and the offshore net foil belt are arranged in parallel, and a fish passing channel is formed between the shore net foil belt and the offshore net foil belt; the fish passing channel is internally provided with a plurality of net doors, and the height of the plurality of net doors is lifted in sequence along the advancing direction of the fish school. The utility model discloses a block can furthest with the fish induction get into the fish passageway in, the setting of different net door heights can be with bottom fish induction to getting fish portion gradually, the net door import design mode that exports greatly has reduced the escape rate when having improved into fish efficiency. Compared with the prior art, the blocking net is arranged in the deepwater net foil device for guaranteeing the fish collecting effect, so that the fish blocking area is increased; the net foil is fixed by the floating drum and the negative pressure anchor, so that the stability of the net foil in a rapid flow is enhanced; the net door is in a wide-in and tight-out mode, the fish passing rate is greatly improved due to the large inlet, the fish passing rate is reduced due to the small outlet, the escape prevention performance is improved due to the consistent specification; meanwhile, the three net doors are arranged in a gradient mode, the design mode not only meets the ethological requirements of the fishes, but also can attract the fishes at the bottom layer into the fish collecting box. The utility model discloses not only having combined the structure of fish gathering platform and having designed, still designed the net door of co-altitude not according to the behavioural characteristic of fish, when improving fish luring efficiency, can lure the fish of gathering life in the bottom waters. The device has the advantages of low cost, easy installation, convenient use, large adjustable range, high fish luring efficiency and the like. The utility model discloses a many net pieces mode, the big export of import of every net piece is little, the effectual fish luring success rate of having guaranteed and very big reduction the rate of escaping. And simultaneously, the utility model discloses can also dispose light, combine together with traditional fish luring measure, very big promotion fish luring efficiency. Compared with the traditional fish luring mode, the deepwater net foil device for guaranteeing the fish gathering effect has the advantages of low cost, easiness in installation, convenience in use, large adjustable range, high fish luring efficiency and the like. The utility model discloses an installation ensures the deep water net paper tinsel device of fish gathering effect on fish gathering platform produces the induction, and effectual guide fish gets into and gets fish portion to reach fish and transport, guarantee the purpose that the fingerling is multiplied, the device safety is secure, the expense is with low costs, the fish gathering is efficient, the fish gathering wide range, the flexible operation just to the fish body not damaged.
Drawings
FIG. 1 is a schematic diagram of a prior art mesh foil configuration;
fig. 2 is a schematic side view of a deep water foil grid device for guaranteeing the fish-collecting effect provided by the present invention;
fig. 3 is a schematic top view of a deep water foil grid device for guaranteeing the fish gathering effect provided by the present invention;
FIG. 4 is a side view of the deep water foil device for ensuring fish-gathering effect of the present invention;
fig. 5 is a top view structural diagram of the deep water net foil device for guaranteeing the fish gathering effect provided by the present invention in a specific use;
wherein:
1-a fish taking part; 2-a third net gate; 3-a second net gate; 4-a lifting zone; 5-blocking the net area; 6-blocking net.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Referring to fig. 2 and 3, the present invention provides a deepwater net foil device for guaranteeing fish-collecting effect, which comprises an offshore net foil belt, an offshore block net and an offshore block net; the bank-approaching block net is connected with the bank-approaching net foil strip; the offshore barrier is connected with the offshore net foil strip; the shore block is opposite to the offshore block and is arranged asymmetrically; the shore net foil belt and the offshore net foil belt are arranged in parallel, and a fish passing channel is formed between the shore net foil belt and the offshore net foil belt; the fish passing channel is internally provided with a plurality of net doors, and the height of the plurality of net doors is lifted in sequence along the advancing direction of the fish school. Wherein the opposite and asymmetric arrangement of the shore block and the offshore block is embodied as follows: the length of the offshore barrier is greater than the length of the onshore barrier; the included angle between the shore net and the cross section of the river and the included angle between the offshore net and the cross section of the river are both 60-70 degrees. The included angle between the shore-approaching block and the cross section of the river is larger than the included angle between the offshore block and the cross section of the river; the included angle between the shore block and the offshore block is not more than 30 degrees; the intersection between the shore net and the offshore net is placed in the fish passage.
The junction between the shore blocking net and the offshore blocking net is arranged at a net door in the fish passage; the advancing direction along the shoal of fish in crossing the fish passageway has set gradually first net door, second net door 3 and third net door 2, and the height of first net door, second net door and third net door lifts in proper order, and the fish of being convenient for constantly climbs and enters into and gets fish portion. The width of the first net gate and the width of the second net gate are L1; the width of the third net door is L2; l1 > L2. A lifting area 4 is formed between the offshore barrier and the first net gate.
The net structures of the offshore blocking net and the offshore blocking net are the same, and both the offshore blocking net and the offshore blocking net comprise blocking nets, the blocking nets are in horn shapes which are easy to enter and difficult to exit, are laid on a passage through which fishes swim or in a water area with dense fishes, intercept and guide the fishes to enter net foils, and are concentrated on the fish taking part for fishing; the height of the barrier net is not more than 8.5 m; the side length of meshes of the blocking net is not more than 2.5 cm; the barrier net is formed by weaving net wires made of polyethylene fibers, the specification of the net wires is 250D-380D/4-1200 strands, and the breaking strength is 7.5 g/D; the rope of the barrier net is made of polyethylene fiber materials, the diameter of the rope is 30mm, and the rope is arranged on the head line and the foot line of the barrier net; the horizontal shrinkage factor ET of the net is 0.6 and the vertical shrinkage factor EN is 0.8.
In addition, the deepwater net foil device for guaranteeing the fish gathering effect further comprises a net foil fixing device which can be used for fixing the deepwater net foil device for guaranteeing the fish gathering effect, so that the net foil is guaranteed to be stable in shape and maximized; the net foil fixing device comprises a mooring bollard, a floating drum and a negative pressure anchor; the floating drums are arranged on the top of the shore net foil strip, the top of the offshore net foil strip, the top of the shore blocking net and the top of the offshore blocking net; the negative pressure anchor is arranged at the bottom of the shore net foil strip, the bottom of the offshore net foil strip, the bottom of the shore block and the bottom of the offshore block; the mooring bollards are arranged on the shore and connected with the shore-approaching net foil belt; the negative pressure anchors are multiple, and the distance between every two adjacent negative pressure anchors is not more than 10 m; the floating drum is respectively connected with the top of the shore net foil strip, the top of the offshore net foil strip, the top of the shore blocking net and the top of the offshore blocking net through fiber ropes; the bollard is connected with the shore net foil belt through a fiber rope.
Fig. 4 and 5 show a preferred embodiment formed based on the deepwater net foil device for guaranteeing the fish gathering effect provided by the present invention, wherein: length of the barrier net 6: the in-situ test adopts a partial interception scheme, according to the width of a river surface, the left side barrier net 6 is 55m long, the right side barrier net 6 is 35m long (the left side barrier net and the right side barrier net jointly form a barrier net area 5), and the arrangement angle of the barrier nets 6 and the cross section of the river is 60-70 degrees; height of the barrier net 6: the height of the blocking net 6 is adjusted to 8.5m from 12m according to the actual measured water depth, so that the resistance of the netting is effectively reduced; the fish passing channel is 19.5m in length and consists of three net doors, and the width of the first net door and the second net door 3 is 0.25 m; the width of the third net door 4 is 0.2m, and the lifting height is 5.5 m; the side length of the meshes of the netting gear is 2.5 cm; the netting gear material is woven by gray netting threads made of polyethylene fibers; the horizontal shrinkage coefficient ET is 0.6, the vertical shrinkage coefficient EN is 0.8, and the group of shrinkage coefficients is selected, so that the high utilization rate of the net piece, the small resistance of the net and the good stress condition can be ensured; the ropes of the barrier net 6 are made of polyethylene fiber materials, the diameter of the ropes is 30mm, and the upper line and the lower line of the ropes are respectively one; the blocking net 6 and the fish passage foot line are both provided with an iron chain (1.43kg/m) with the inner diameter of 8mm, and the cross line of the fish taking part 1 adopts a steel pipe (2.15kg/m) with the inner diameter of 32mm to carry out weight balancing and net clothing stretching. The diameter of the foam plastic ball-shaped floater is 15cm, and one floater is added every 1 m. Four corners of the net cage of the net door, the fish gathering part and the joint of the anchor rope and the head line are all provided with cylindrical foam plastic buoys with the diameters of 40cm and the lengths of 60 cm.
The fish collecting working section is provided with 10 anchoring facilities for anchoring a fish collecting platform and a net foil, wherein the right bank is provided with 4 mooring bollards, and the river is provided with 6 floating drums; the anchor pile sites are all selected on bedrock on the side of the river bank, so that construction of anchor piles and safety of anchor piles with high discharge capacity are facilitated, the elevation of all anchor pile sites is about 1225m, and anchor piles are guaranteed to be located above the water surface all the time in the working period of the fish gathering and transporting system. And a negative pressure anchor is arranged at the bottom of the deepwater net foil device for ensuring the fish collecting effect every 10m, and a floating drum and a mooring bollard are connected at the bottom of the deepwater net foil device for ensuring the fish collecting effect by using a fiber rope for further ensuring the shape fixation of the net foil.
Additionally, the utility model provides a guarantee deep water net paper tinsel device of fish-gathering effect's main construction parameter is:
selecting proper construction time and position; constructing fixed anchor piles on the river bank, and erecting connecting ropes; and laying the blocking net 6 along the anchor pile rope from the bank of the river channel, laying the blocking net in left and right steps, and gradually laying the blocking net to the fish collecting part. Carrying out water transportation by using a motor-driven ship; fixing the upper part of the deepwater net foil device for guaranteeing the fish gathering effect by using the shore slope mooring bollards and the floating drums; the negative pressure anchor is put in to fix the bottom of the deepwater net foil device for guaranteeing the fish gathering effect, and in order to further guarantee the fixing effect, the underwater negative pressure anchor and a floating drum and a mooring bollard on the water surface can be connected, so that the shape of the netting is guaranteed to the maximum extent; and checking the laying condition of the mesh foil to adjust and position.
The utility model discloses an utilize the distribution change of fish when rope bait, breed, overwintering to have the characteristics of certain law, through the reasonable combination of net piece on the passageway of fish activity, lay the fishing instrument that the induced fish of a multi-net door easily advances difficult play. Because the blocking facilities of the utility model are not symmetrically distributed, the length of one side close to the bank is 30m, and the length of one side close to the center of the river is 55m, the structure ensures that the fish blocking surface is larger; the angle of the blocking net is 30 degrees, which is smaller than that of the blocking net of other net foils, thereby enhancing the stability of the blocking net in the water body. The net doors are connected with the blocking net, the net doors of common net foils are between 20 and 40, the height and the width of each net door are different, and the specification of the net doors is continuously reduced from the first net door to the last net door and is in a horn shape; the specifications of the net doors adopted by the utility model are all consistent, the height of the entrance of the net door is 4m, the height of the exit is 0.25m, the net door is a wide-entrance and tight-exit form, the fish passing efficiency is ensured, and the escape prevention rate of the collected fish is improved; only 3 net doors are arranged, compared with the traditional 20 net doors, the staying time of the fish in the net foil is shorter, and the fish collecting efficiency is undoubtedly improved; the three net doors are arranged in a gradient mode, the maximum depth under water is 8.5m, the height of a fish taking area is 3m, the design mode not only meets the ethological requirements of fishes, but also can attract fishes at the bottom layer into the fish collecting box. The deepwater net foil device fishing device applied to the fish gathering platform and ensuring the fish gathering effect can solve the problems of how to lure and gather fishes in different water layers, how to reduce the cost, how to improve the fish luring efficiency and the like. The deepwater net foil for ensuring the fish gathering effect is a fishing tool which induces fishes to easily enter and difficultly exit through reasonable combination of net sheets by utilizing the characteristic that the distribution change of the fishes during bait-fishing, breeding and overwintering has a certain rule and arranging a multi-net-door device on a fish activity channel. The net foil has the advantages of safety, reliability, low cost, easy installation, convenient use, large adjustable range, high fish luring efficiency and the like. The deepwater net foil device for guaranteeing the fish gathering effect is installed at a proper position. The method comprises the steps of constructing fixed anchor piles on the river bank, erecting connecting ropes, laying a blocking net along the anchor pile ropes from the bank side of the river, laying the blocking net in left and right steps, gradually laying the blocking net to a fish taking part 1, fixing the upper part of a deep water net foil device for guaranteeing the fish gathering effect by using bank slope mooring bollards and floating drums, connecting underwater negative pressure anchors and floating drums and mooring bollards on the water surface to guarantee the fixing effect to the maximum extent, and finally checking the laying condition of net foils to adjust and position.
Claims (10)
1. The utility model provides a guarantee deep water net paper tinsel device of fish-gathering effect which characterized in that: the deepwater net foil device for guaranteeing the fish collecting effect comprises an offshore net foil belt, an offshore block net and an offshore block net; the shore blocking net is connected with the shore net foil strip; the offshore barrier is connected to an offshore foil strip; the shore block is opposite to the offshore block and is arranged asymmetrically; the shore net foil belt and the offshore net foil belt are arranged in parallel, and a fish passing channel is formed between the shore net foil belt and the offshore net foil belt; the fish passing channel is internally provided with a plurality of net doors, and the height of the plurality of net doors is lifted in sequence along the advancing direction of fish school.
2. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 1, wherein: the length of the offshore barrier is greater than the length of the onshore barrier; the included angle between the shore-approaching block and the cross section of the river and the included angle between the offshore block and the cross section of the river are both 60-70 degrees.
3. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 2, wherein: the included angle between the shore-approaching block and the cross section of the river is larger than the included angle between the offshore block and the cross section of the river.
4. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 3, wherein: the included angle between the shore block and the offshore block is not more than 30 degrees; the intersection between the shore block and the offshore block is placed in the fish passage.
5. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 4, wherein: the junction between the shore block and the offshore block is arranged at the net door in the fish passage.
6. The deep water net foil device for guaranteeing the fish gathering effect as claimed in any one of claims 1 to 5, wherein: a first net door, a second net door and a third net door are sequentially arranged in the fish passing channel along the advancing direction of the fish school; and the heights of the first net door, the second net door and the third net door are sequentially lifted.
7. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 6, wherein: the width of the first net gate and the width of the second net gate are L1; the width of the third net door is L2; the L1 is more than L2.
8. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 7, wherein: the net structures of the offshore block net and the offshore block net are the same and both comprise block nets; the height of the barrier net is not more than 8.5 m; the side length of meshes of the barrier net is not more than 2.5 cm; the barrier net is formed by weaving net wires made of polyethylene fibers, the specification of the net wires is 250D-380D/4-1200 strands, and the breaking strength is 7.5 g/D; the rope of the barrier net is made of polyethylene fiber materials, the diameter of the rope is 30mm, and the rope is arranged on the head line and the foot line of the barrier net; the horizontal shrinkage factor ET of the barrier net is 0.6, and the vertical shrinkage factor EN is 0.8.
9. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 8, wherein: the deepwater net foil device for guaranteeing the fish gathering effect further comprises a net foil fixing device; the net foil fixing device comprises a mooring bollard, a floating drum and a negative pressure anchor; the floating drums are arranged on the top of the shore net foil strip, the top of the offshore net foil strip, the top of the shore blocking net and the top of the offshore blocking net; the negative pressure anchor is arranged at the bottom of the shore net foil strip, the bottom of the offshore net foil strip, the bottom of the shore block and the bottom of the offshore block; the bollard is arranged on the shore and connected with the shore-approaching net foil belt.
10. The deepwater net foil device for guaranteeing the fish gathering effect as claimed in claim 9, wherein: the negative pressure anchors are multiple, and the distance between every two adjacent negative pressure anchors is not more than 10 m; the floating drum is respectively connected with the top of the shore net foil strip, the top of the offshore net foil strip, the top of the shore blocking net and the top of the offshore blocking net through fiber ropes; the bollard is connected with the shore net foil belt through a fiber rope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920341414.9U CN210341841U (en) | 2019-03-18 | 2019-03-18 | Deep water net paper tinsel device of guarantee fish gathering effect |
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| CN201920341414.9U CN210341841U (en) | 2019-03-18 | 2019-03-18 | Deep water net paper tinsel device of guarantee fish gathering effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811730A (en) * | 2019-03-18 | 2019-05-28 | 华能澜沧江水电股份有限公司 | A kind of deep water net foil device ensureing fish-gathering effect |
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2019
- 2019-03-18 CN CN201920341414.9U patent/CN210341841U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811730A (en) * | 2019-03-18 | 2019-05-28 | 华能澜沧江水电股份有限公司 | A kind of deep water net foil device ensureing fish-gathering effect |
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