WO2017222390A1 - Agencement de chalutage - Google Patents

Agencement de chalutage Download PDF

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Publication number
WO2017222390A1
WO2017222390A1 PCT/NO2017/050163 NO2017050163W WO2017222390A1 WO 2017222390 A1 WO2017222390 A1 WO 2017222390A1 NO 2017050163 W NO2017050163 W NO 2017050163W WO 2017222390 A1 WO2017222390 A1 WO 2017222390A1
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WO
WIPO (PCT)
Prior art keywords
trawl
propeller
sed
traction device
aracte
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.)
Ceased
Application number
PCT/NO2017/050163
Other languages
English (en)
Inventor
Mads BJØRNENAK
Øyvind FRØYTLAND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eco Trawl As
Original Assignee
Eco Trawl As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eco Trawl As filed Critical Eco Trawl As
Publication of WO2017222390A1 publication Critical patent/WO2017222390A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • 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
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A01K73/04—Devices for spreading or positioning, e.g. control thereof
    • 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
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A01K73/04—Devices for spreading or positioning, e.g. control thereof
    • A01K73/045—Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards
    • 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
    • A01K79/00—Methods or means of catching fish in bulk not provided for in groups A01K69/00 - A01K77/00, e.g. fish pumps; Detection of fish; Whale fishery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56—Towing or pushing equipment
    • B63B21/66—Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
    • B63G2008/002—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned
    • B63G2008/005—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned remotely controlled
    • B63G2008/007—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned remotely controlled by means of a physical link to a base, e.g. wire, cable or umbilical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/42—Towed underwater vessels

Definitions

  • the present invention relates to a trawling arrangement, a method of operating a trawl, a traction device for towing a trawl and a trawl door.
  • Trawling as a fishing technique has existed in its current form since the end of the 19 th century. It is based on a bag shaped net that is towed through the water by a boat, i.e. a trawler. To keep the trawl net open, a pair of trawl doors are connected to the trawl some distance in front of the trawl opening. The doors have an angle of attack with respect to the draw direction, so that a horizontal spread is created.
  • the trawling depth is highly depending on the type of catch. For catching species, that are close to the bottom, such as flatfish or shrimp, the trawl has to be towed close to the bottom. This means that very long warps, i.e. the trawl wires that connect the trawl doors to the boat, have to be deployed. The length of the warps is several times the depth of the trawl. These warps create a substantial drag, which makes bottom trawling very fuel demanding, and also require the use of high power engines.
  • GB 695641 shows a trawl net that is being towed by a pair of underwater crafts.
  • the crafts may be electrically driven and are connected to a mother ship by electrical power lines.
  • the mother ship may also control the depth and side steering of the crafts.
  • the mother ship is connected to the cod end of the net by guide lines, which means that the ship trails the trawl net.
  • the guide lines are kept suitably taut during the trawling.
  • the purpose of the guide lines is to pull the cod end up to the ship when the net is full.
  • DE 1 181484 also shows a suggested solution that uses underwater crafts for towing the net.
  • the crafts are connected to each other by a boom or similar that keeps the crafts at a mutual fixed distance.
  • the boom ensures that the net is held open.
  • the boom structure will create a substantial extra drag for the trawl.
  • WO 2010/015254 shows a trawl configuration that uses one underwater craft that tows one side of the trawl net while the trawler tows the other side.
  • the underwater craft has a fixed length of wire connecting it to the net, there is little possibility of varying the trawling depth and it would not be possible to trawl below a certain depth. Summary of the invention
  • the present invention has as its main objectives to be able to tow a trawl without the need of warps between the boat and the trawl to create the pulling force or with a reduced need for pulling force from the boat.
  • the invention also has as an object to provide greater freedom for the boat to move and be position relative to the trawl.
  • the invention is defined by a trawling arrangement, comprising a trawl net with an opening and a cod end, and a t least two propelled and steerable traction units that are coupled to the trawl net, one on each lateral side, by sweep lines, said traction units being coupled to a vessel at the surface at least one electrical power cable, wherein said at least one electrical cable is configured to position said vessel so that the opening of the trawl net is within an echo sonar field of said vessel.
  • the invention defines a method of operating a trawl, said trawl comprising a trawl net with an opening and a cod end, and at least two propelled and steerable traction units that are coupled to the trawl net, one on each lateral side, by sweep lines, said traction units being coupled to a vessel at the surface at least one electrical power cable, wherein that the method comprises the step of positioning the opening of the trawl net within an echo sonar field of said vessel during trawling.
  • the invention in a third aspect, relates to a traction device for towing a trawl net, comprising at least one propeller, a motor coupled to said propeller, said motor being arranged in a motor housing, said motor housing having an attachment bracket for attachment of sweep lines, a duct being arranged to encircle said at least one propeller, wherein the device comprises at least one steering fin that is hingedly attached relative to said motor housing and that said at least one steering fin is situated at the opposite side of the hydrodynamic centre of said traction device relative to said attachment bracket.
  • said at least one propeller is arranged on an opposite side of the motor housing from the attachment bracket. This will ensure optimum flow towards the propeller without the flow being disturbed by the motor housing.
  • said duct is attached to said motor housing by webs, said at least one steering fin being attached to one of said webs.
  • the traction device has four steering fins that are arranged at an angular distance of 90°. This enables manoeuvrability in all directions, port, starboard, up and down.
  • the invention defines a traction device for towing a trawl net, comprising at least one propeller, a motor coupled to said propeller, a duct being arranged to encircle said at least one propeller, and an attachment bracket for attachment of sweep lines, wherein the traction device comprises a trawl door that is attached to said motor housing or said duct.
  • a main plane of said trawl door is parallel to or coincides with a rotational axis of said propeller.
  • the invention defines a trawl door for coupling to a trawl, said trawl door having a main plane, wherein the door comprises a traction device with a propeller, a duct encircling said propeller and a motor coupled to said propeller; said motor being arranged in a motor housing, said propeller having a rotation axis that is parallel with or coinciding with said main plane.
  • this enables both simple adjustment of the spread of the trawl and the powered trawl doors can take some of the pulling of the trawl that otherwise would have to be done by the trawler.
  • said traction device is arranged in an opening in the trawl door.
  • the invention defines a traction device comprising a plurality of propellers that are arranged in substantially the same plane, a motor coupled to a respective one of said propellers, characterised in that it comprising at least three propellers, said propellers being separately controllable to manoeuvre said pod in all directions.
  • Figure 1 shows a first embodiment of the trawl arrangement according to the present invention in side elevation view
  • Figure 2 shows the trawl arrangement of figure 1 with the trawl being pulled downwards towards the seabed
  • Figure 3 shows the trawl arrangement of figure 1 with the trawl being pulled upwards from the seabed
  • Figure 4 shows the trawl arrangement of figure 1 in planar view
  • Figure 5 shows the trawl arrangement of figure 4 with the trawl being pulled sideways in a first direction with respect to the towing direction
  • Figure 6 shows the trawl arrangement of figure 4 with the trawl being pulled sideways in a second opposite direction with respect to the towing direction
  • Figure 7 shows the trawling arrangement of the present invention in isometric view
  • Figure 8 shows a second embodiment of the present invention with combined trawl doors and pods, in side elevation view
  • Figure 9 shows the second embodiment of figure 8 in planar view
  • FIG. 10 shows a close-up of the trawl door and pod combination according to the embodiment shown in figures 8 and 9,
  • Figures 1 1 a - g show a first embodiment of a pod suitable for the trawl arrangement according to the embodiment of figures 1 -7,
  • Figure 12 shows a second embodiment of a pod suitable for the trawl arrangement according to the embodiment of figures 1 -7, the pod having counter rotating propellers,
  • FIGS 13a - f explain schematically the force and moment arm view of the pod
  • Figure 14 shows a further alternative pod where the manoeuvring is done by varying the differential speed of a plurality of propellers
  • Figure 15 shows a first configuration of a double trawl
  • Figure 16 shows a second configuration of a double trawl
  • Figure 17 shows how the pods are manoeuvring the trawl close to the seabed
  • Figure 18 shows that the trawl and the boat can follow different tracks
  • Figure 19 shows that the spread of the trawl can be varied.
  • figure 1 a trawling arrangement of the present invention in side elevation view.
  • Figure 4 shows the same arrangement in planar view and figure 7 shows the arrangement in isometric view.
  • the trawl arrangement comprises a boat 1 , which is situated at the sea surface 2. From the boat 1 a pair of cables 3a, 3b extend to a respective pod 4a, 4b. From the pods 4a, 4b a sweeps 5a, 5b, 5c, 5d extends to the trawl net 6 and are attached to a respective corner 7a, 7b, 7c, 7d of the net 6.
  • the configuration may deviate somewhat from the above, e.g., instead of two sweeps from the pod 4a, b to the corners of the net 6, there may also be one sweep that connects with a bridle of two lines, as is generally known in the field of trawling.
  • the net 6 comprises a headline 8 and a footrope 9. Between the headline 8 and the footrope 9 is defined an opening 10 into the net 6. At the trailing end of the net is a narrow part called a cod end 1 1 .
  • FIG. 1 a-g a-g embodiment of the pods 4a, 4b is shown in figures 1 1 a-g, showing the pod in the following views: 1 1 a: front elevation, 1 1 b: rear elevation, 1 1 c: longitudinal section, 1 1 d: cross section, 1 1 e: side elevation, 1 1f: rear isometric view and 1 1 g: front isometric view.
  • the pod 4a, b has a similar design as azimuth propellers that are conventionally used on boats and ships to increase manoeuvrability, such as the azimuth propeller described in EP 2468624.
  • the pod comprises a cylindrical duct 12, which encircles a propeller 13.
  • the propeller 13 is mounted at one end of a shaft (not shown) that is supported in a motor housing 14.
  • the duct 12 is attached to the motor housing 15 via four webs 16.
  • the propeller 13 is facing the direction of travel, while the motor housing 15 is at the trailing side of the direction of travel.
  • a fin or flap 17 is hingedly attached to the trailing side of each web 16.
  • an ear 18 that functions as an attachment means for the sweeps 5a, b, c, d.
  • the motor housing 15 contains an electric motor (not shown) and may also contain a battery package (not shown).
  • the battery package may be
  • the duct 12 serves both to protect the propeller 13 and to increase the efficiency of the propeller.
  • the fins 17 are set at an angle that
  • the propeller 13 As the propeller 13 is arranged at the front of the pod 4a, b in the direction of travel, there are no obstacles that will decrease the efficiency.
  • the propeller is arranged at the rear side of the pod. In that case the pod body will be in front of the propeller and hinder the flow of water to the propeller.
  • the cables 3a and 3b may be electrical cables that supply the electrical motor in the pod 4a, 4b with electricity.
  • a generator and an engine on board the boat generate the electricity.
  • a battery package in the pod may functions to level out the peaks of the energy consumption, so that the engine and generator on board the boat can run at a constant speed.
  • the boat may also have batteries for peak loads.
  • FIG. 12 shows an alternative embodiment of the pod. This deviates from the embodiment of figures 1 1 a-g by having a double propeller 19 with two propellers 19a and 19b that rotates in opposite directions. This ensures that the pod as such is not rotating along its longitudinal axis. By changing the angle of the fins 17, the pod can be steered in different directions.
  • Figure 2 shows that the fins 17 are angled to steer the pods 4a, 4b downwards towards the seabed 20.
  • Figure 3 shows that the fins 17 are angled to steer the pods 4a, 4b upwards from the seabed 20.
  • Figures 5 and 6 shows that the fins 17 are angled to steer the pods 4a, 4b sideways to the port and starboard side, respectively, relative to the direction of travel of the boat 1 .
  • the boat 1 does not impose any towing force on the trawl.
  • the trawl and boat can therefore move independently of one another within the constraints that the length of the cables 3a and 3b gives. This makes it possible to position the boat slightly forward of the net 6 and so that the trawl opening is within the field of the sonar or echo sounder of the boat. Thereby the boat can follow closely both the condition of the trawl, such as spread of the pods, and the amount of and type of fish or other catch that enters the trawl.
  • FIGs 8 and 9 shows an alternative embodiment of the trawl arrangement according to the invention.
  • the pod is a combined trawl door and pod 22, as shown in figure 10.
  • the trawl door and pod combination 22 can best be described as a conventional trawl door 23 in which an opening has been made to receive the pod 24.
  • the pod may be of any of the types shown in figures 1 1 a-g and figure 12.
  • the door/pod combination 22 can be attached to the boat 1 by a warp 25 in a per se conventional.
  • the sweeps 26 can be attached to the pod 24 or the door 23.
  • the door/pod combination 22 can create the necessary propulsion to tow the trawl 6, so that the warps are used only to keep the door/pods 22 at a certain separation from each other.
  • the propulsion may also be distributed between the door/pods 22 and the boat 1 to a selected ratio. It is also possible to use the pods only to steer the doors upwards, downwards and sideways and let the boat create the towing force.
  • FIGs 14a and 14b is shown an additional alternative pod 30.
  • This pod comprises four propellers 13a, b, c, d that are arranged in substantially the same plane.
  • the propellers have each a separate duct 12a, b, c, d, but it is also conceivable to have one duct surrounding all propellers.
  • the ducts are rigidly coupled to each other, such as by welding.
  • the propellers have each a separate motor housing 15a, b, c, d.
  • the motor housings are connected to the ducts by webs 16.
  • At the end of each motor housing is an ear 18 for connecting a sweep (not shown).
  • the fins may be omitted.
  • the pod 30 can be manoeuvred by differentiating the speed of the propellers 13a-d. For example, if it is desired to steer the pod 30 towards port, the propellers 13a and 13d on the starboard side are sped up, or alternatively or in addition, the propellers 13b and 13c on the port side is slowed down.
  • the pod 30 preferably has four propellers, but it is also possible to manoeuvre the pod in all direction with as few as three propellers.
  • the pod 30 may also have more than four propellers.
  • Figure 13a -f show the force and moment arm view of one pod 4a.
  • the propeller 13, one fin 17, the motor housing 15, and the duct 12 are shown schematically.
  • the sweeps 5a, 5b are connected to the pod 4a at a connection point 27.
  • the hydrodynamic centre of the pod is denoted by 21 .
  • the propeller 13 is arranged in front of the hydrodynamic centre 21 in the travelling direction of the trawl.
  • the propeller 13 is arranged behind the hydrodynamic centre 21 in the travelling direction of the trawl.
  • connection point 27 may be considered as a fixed point and the pod 4a is allowed to swing about this fixed point 27.
  • the hydrodynamic centre 21 is the point where the resultant force of all hydrodynamic forces, especially lift and drag, is acting. This point will be the same irrespective of the position of the fins 17.
  • FIG. 13a Starting with figure 13a, is shown a pod 4a that is travelling straight forward.
  • the fin 17 is in neutral position.
  • the forces acting on the pod is the pulling force Fi of the propeller 13, the resultant force F2 from the sweeps 5a, 5b, the resultant upward hydrodynamic force F3 and the resultant downward
  • hydrodynamic force F 4 If the pod is travelling at a constant speed, the forces Fi and F2 are equal. Unless, there is a water current in any direction transverse to the direction of travel the hydrodynamic forces Fs and F 4 are also in balance.
  • a pod 4a' which has the propeller 13 and the duct 12 arranged at the rear of the motor housing 15, similar to the arrangement shown in GB695641 .
  • the similar forces as in figure 13a, acting on the pod 4a' when travelling straight ahead at constant speed and with no transverse currents is also shown. Also here are the forces Fi and F2 in balance and the forces F3 and F 4 in balance.
  • the fin 17 has been adjusted to create a downward force F5.
  • This will tilt the pod 4a about the point 27, as the force F5 created a momentum about the point 27 with an arm A5.
  • the pulling force Fi from the propeller will be acting obliquely downward, as shown.
  • the hydrodynamic forces will no longer be in complete balance, as the downward force F 4 will be slightly larger than the upward force F3.
  • This will create an increased momentum about the point 27 as the resultant force of F3 andF 4 acts with an arm A 4 .
  • the fin has to be adjusted back somewhat. However, due to the much shorter arm A 4 than the arm A5, the effect of the resultant force F 4 - F3 is not large.
  • FIG 13e is shown the same situation as in figure 13b involving the pod 4a'.
  • the fin 17 is set at an angle that creates a downward force F5, which acts with an arm of momentum A5 about the point 27. This will tilt the pod 4a' downwards. Due to the change of direction, the hydrodynamic forces will change and result in a positive downward acting force F 4 - F5. This resultant force acts with an arm A* about the point 27. Since the arm A 4 is much longer than the arm A5 the contribution from the hydrodynamic forces will be much greater than is the case with the pod 4a in figure 13b. The fin therefore has to be adjusted back quite a bit to that the pod is tilted too much downward.
  • the fin may not be able to counteract the momentum of the hydrodynamic forces so that the pod ends up travelling in another direction than intended.
  • FIG 13c is shown a situation where a current C transverse to the direction of travel pushes the pod away from the direction T of travel.
  • the current may be upwards or downwards in the sea, but may also be a side current that pushes the pod 4a sideways.
  • the resultant hydrodynamic force F6 has been shown.
  • the fin 17 can be adjusted to compensate for the hydrodynamic force F6 and create an opposite force F5.
  • the force F5 is acting on a longer arm A5 than the arm ⁇ , the force F5 necessary to compensate for the force F6 is much smaller than the force F6.
  • FIG 13f is shown the same situation as for figure 13c but with the pod 4a'.
  • the resulting hydrodynamic force F6 is acting on a much longer arm ⁇ than the adjusting force F5 of the fin 17. This means that the necessary compensating force F5 must be much larger than the resulting hydrodynamic force F6.
  • FIG 15 shows a possible configuration of a double trawl.
  • two trawl nets 6a and 6b are coupled together either by connecting nearest corners 7a, 7b or by connecting their nearest sweeps 5a, 5b to a common pod 4b.
  • the result is a trawl with two nets 6a and 6b and three pods 4a, 4b, 4c.
  • Figure 16 shows an alternative double trawl arrangement.
  • the two trawl nets 6a, 6b are connected to separate pods 4a, 4b, 4c and 4d.
  • the nets 6a, b can therefore to a certain degree be manoeuvred independently.
  • Figure 18 shows how the pods can be manoeuvred to follow the seabed when the seabed is undulating up and down.
  • the hatched area is the area covered by the trawl.
  • Figure 19 shows that the trawl can be manoeuvred along a different track (hatched area) than the boat (single line).
  • Figure 20 shows that the spread of the pods 4a, 4b and hence the spread of the trawl opening can be varied (hatched area) as the trawl is travelling.
  • the pods of the present invention it is very convenient to arrange a flow meter on the pod. This will provide an accurate measurement of the flow of water past the pod.
  • a sensor that measures the speed in relation to the seabed, an absolute value for the sea current can be obtained.
  • the pod may also have a load cell to measure the tension in the sweeps. This can also be used to calculate the flow of water.
  • One or both pods may also be equipped with a sonar or echo sounder, which may send soundwaves at an angle forward of the pod, to determine the state of and distance to the seabed and detect fish or other species.
  • a sonar or echo sounder which may send soundwaves at an angle forward of the pod, to determine the state of and distance to the seabed and detect fish or other species.
  • the distance to the seabed may be detected by the sonar or by other per se known sensors and be used to determine the angling of the fins to keep the trawl at a certain distance above the seabed.
  • the pods may be equipped with an accelerometer that detects the orientation of the pod, so that the fins can be adjusted to bring the pod back to a
  • sensors may also be included in the pods, such as spread sensors to determine the distance between the pods, temperature sensors, depth sensors, salinity sensors, etc.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

La présente invention concerne un agencement de chalutage, comprenant un chalut (6) avec une ouverture (10) et un un raban de cul (11), et au moins deux unités de traction propulsées et orientables (4a, b) qui sont couplées au chalut (6), une sur chaque côté latéral, par des lignes de balayage. Les unités de traction sont couplées à un navire (1) à la surface par au moins un câble d'alimentation électrique (3a, b). Le câble électrique (3a, b) est configuré de façon à positionner ledit navire (1) de sorte que l'ouverture (10) du chalut (6) soit dans un champ de sonar d'écho dudit navire (1). L'invention concerne en outre un dispositif de traction avec au moins une hélice et une porte de chalut équipée d'un dispositif de traction.
PCT/NO2017/050163 2016-06-22 2017-06-20 Agencement de chalutage Ceased WO2017222390A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20161043A NO343896B1 (en) 2016-06-22 2016-06-22 Trawling arrangement
NO20161043 2016-06-22

Publications (1)

Publication Number Publication Date
WO2017222390A1 true WO2017222390A1 (fr) 2017-12-28

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NO (1) NO343896B1 (fr)
WO (1) WO2017222390A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109874759A (zh) * 2019-04-08 2019-06-14 上海海洋大学 一种便携式水产养殖体回收装置及其使用、收纳方法
CN111387147A (zh) * 2020-04-24 2020-07-10 上海海洋大学 一种主动式秋刀鱼舷提网网具及其放网方法
WO2021225451A1 (fr) * 2020-05-08 2021-11-11 Eco Trawl As Dispositif de traction pour remorquer un objet le long d'une surface d'eau ou dans un plan d'eau
WO2021237954A1 (fr) * 2020-05-27 2021-12-02 中国水产科学研究院东海水产研究所 Appareil de réglage autonome de levage-plongée pour chalut à perche pour euphausia superba
NO20201047A1 (en) * 2020-09-23 2022-03-24 Geiga As Trawl device
CN114585254A (zh) * 2019-08-23 2022-06-03 卡莫伊温奇公司 控制被拖引海上物体的控制系统和方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB695641A (en) * 1949-08-20 1953-08-12 Aage Gernow Improvements in and relating to fishing
DE1181484B (de) * 1961-08-08 1964-11-12 Marcel Calamel Vorrichtung zum Fischen mit Netz
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DE1181484B (de) * 1961-08-08 1964-11-12 Marcel Calamel Vorrichtung zum Fischen mit Netz
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CN109874759B (zh) * 2019-04-08 2021-07-09 上海海洋大学 一种便携式水产养殖体回收装置及其使用、收纳方法
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CN114585254A (zh) * 2019-08-23 2022-06-03 卡莫伊温奇公司 控制被拖引海上物体的控制系统和方法
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CN111387147A (zh) * 2020-04-24 2020-07-10 上海海洋大学 一种主动式秋刀鱼舷提网网具及其放网方法
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