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
  • 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

Definitions

• the invention relates to a method for trawling, in particular a method for promoting the trapped catch of the trawl on board the fishing vessel. Moreover, the invention relates to a device for conveying the captured catch material from the trawl on board the fishing vessel.
• Trawling is one of the main fishing techniques used when fishing the seas.
• trawl consisting essentially of a net bag, which is held open during the towing by shear boards, and a subsequent to the end of the net bag codend in which collects the catch consist.
• DD 206 524 a method and a trawl are described in which the fishing from the trawl is pumped by means of a pump through a pumping tube from the trawl bag, which is located in the water, on board the ship.
• the pump is attached to the trawl sack prior to introduction of the trawl net for fishing.
• Both the pump tube and the power supply lines are routed from the pump to near the opening of the trawl, with the supply lines provided with couplings for connection to the corresponding lines on board the ship.
• the trawl net is brought close to the ship, remaining in the water, the trawl supply lines are connected to the appropriate onboard supply lines, and the trawl sack is emptied by the pump, after which the trawl is returned to the fishway.
• WO 2005/004593 A1 discloses a trawl device in which the trawl net has at its end an elongated rigid or flexible collecting cage which is connected to the towing vehicle via a transport hose. With appropriate filling of the collecting cage with fish or krill, the fish / water mixture is sucked out of the collecting cage by a pump based on the injector principle and conveyed via the transport hose on board the towing vehicle.
• the pump technology is on board the towing vehicle.
• the disadvantage of this device is that due to the increasing trawling trawling an increasing length of the conveying path occurs, which entails a growing capacity of the pump, which leads to an increase in the fishing technique and thus to a reduction of the economic result.
• the object of the invention is to provide a method for trawling by which a steady transfer of the trapped in the trawl caught on board the towing vehicle is ensured during the towing process.
• the object of the invention is furthermore to provide a device for carrying out the method.
• the objects are achieved by a method having the features of claim 1 and by a device having the features of claim 3.
• the inventive method provides that at the open end of the trawl a fish pump is arranged, which is directed with its suction side in the trawl and whose pressure side is connected to the delivery hose.
• the catching material directed to the end of the trawl is constantly pumped into the conveying hose during the trawling process as catching material / water mixture.
• the fish pump is connected for its drive with a supply device located on board the towing vehicle via a supply line.
• the fish pump can be controlled via the supply line so that the flow rate of the fish pump is reduced to temporarily blockage of catching material to avoid blockage of the pump by a portion of the catch is not detected by the fish pump, but by the fish pump over from the Trawl out.
• the device according to the invention consists in that the end of the trawl net is designed as an open network tunnel with an entry directed towards the trawl and an exit leading out of the trawl net.
• a fish pump In the center of the network tunnel, a fish pump is arranged, which is directed with its suction side in the trawl and is connected with its pressure side with the delivery hose, wherein the fish pump to the wall of the network tunnel has a defined distance.
• the fish pump is controllably driven via a supply device installed on board the towing vehicle, to which it is connected via a supply line.
• FIG. 4 shows the schematic illustration of the trawl net, including the shear boards, the buoyant bodies and the fish pump attached to the end of the trawl net,
• Fig. 5 shows the schematic structure of the open pump assembly at the end of the trawl.
• the trawl 2 is towed in a conventional manner with the help of special Kurrleinen 3 with or without cutting boards 4 behind a sluggish fishing vessel 1. In this process, the catch is caught by the trawl 2 and collected concentrated at the end of the trawl 2.
• the method according to the invention provides that the trapped material is concentrated by the trawl net 2, is continuously pumped off during the trailing process and fed to the fishing vessel 1 via a delivery hose 5. There is an equally continuous processing of the catch.
• This type of transport of the catch in particular of krill, subject the Fanggut no extraordinary pressure and can be spent immediately on board the fishing vessel 1.
• a key feature of the method according to the invention is that the catch is not affected by stress, such as pressure and long residence time in the trawl 2 and thus the quality of the captured material is maintained. This is a decisive advantage over conventional capture methods and ensures the production of high quality end products.
• the delivery hose 5 has a larger diameter to the corresponding possible conditions between the catching material and the water flow to achieve optimum delivery.
• the delivery hose 5 is composed of segments of several meters in length by means of hose couplings 11 so that the different fishing depths by adding or Removal of individual hose segments can be ensured.
• the hose couplings 11 are executed simultaneously with connecting members 12, so that through them the guide wire rope 9, the drag weight chain 10 on one side and the supply hose 7 are adjusted on the other side relative to the delivery hose 5.
• the guide wire rope 9 or the drag weight chain 10 stabilize the delivery hose 5 and relieve this from occurring tensile forces, especially during towing.
• the guide wire rope 9 and the drag weight chain 10 are operated, each with its own wind operated on a block 13.
• the drag weight chain 10 forms the conclusion of the guide wire rope 9 and gives by its own weight the entire hose system the required stability.
• the supply hose 7 is guided to the end of the trawl 2, where the open fish pump 14 is installed in addition to the delivery hose 5.
• About the supply hose 7 either seawater or environmentally friendly hydraulic oil is passed under great pressure from the onboard pressure generator to the fish pump 14. Characterized the fish pump 14 is driven, which sucks the catching material and promotes the delivery hose 5 on board the fishing vessel 1. There, the transfer takes place directly on a transport system and from there into the processing to high-quality end products.
• the fish pump 14 is arranged in the rear region of the trawl 2 in the manner described below.
• the trawl 2 is open at its rear end and merges into an open network tunnel 15.
• the network tunnel 15 has an inlet 16 directed towards the trawl net 2 and an exit 17 leading out from the trawl net 2 and is formed from a top sheet 18, a bottom sheet 19 and two side sheets 20 joining the top sheet 18 and the bottom sheet 19 to form a square cross section.
• the fish pump 14 is arranged so that it is directed with its suction side in the trawl 2 and is connected with its pressure side with the delivery hose 5. In this case, the fish pump 14 to the wall of the network tunnel 15 at a defined distance.
• the delivery hose 5 and the supply hose 7 are passed through the top sheet 18 and connected to the fish pump 14.
• a net sheet 21 is mounted over the entire network opening in a defined angle.
• This network sheet 21 with a medium mesh size has the task unwanted bycatch and possibly sea mammals on an escape window 22 in the top sheet 18 of the trawl 2 to select.
• a wedge-shaped screen mesh 23 located in front of the fish pump 14, a wedge-shaped screen mesh 23 that keeps all foreign matter from the fish pump 14 and transported via a further escape window 24 to the outside of the trawl 2.
• the invention will be described below in its operation.
• the towing process by the fishing vessel 1, in which the entrance of the trawl 2 is opened by the shear boards 4 begins.
• Krill is captured by the trawl 2 and directed to the open end of the trawl 2.
• fish pump 14 sucks immediately and continuously located in the network tunnel 15 Krill / water mixture and pushes it into the delivery hose 5. From there, the krill / water mixture on board the fishing vessel 1 to another Processing encouraged.
• the flow rate of the fish pump 14 is throttled from board the fishing vessel 1 via the supply line 7, so that a smaller amount of Krill is sucked.
• the krill not picked up by the fish pump 14 can escape from the trawl net 2 through the lateral clearance between the fish pump 14 and the network tunnel 15.

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• Life Sciences & Earth Sciences (AREA)
• Environmental Sciences (AREA)
• Animal Husbandry (AREA)
• Biodiversity & Conservation Biology (AREA)
• Marine Sciences & Fisheries (AREA)

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Cited By (10)

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Citations (3)

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• 2007
  • 2007-04-17 DE DE102007018412.5A patent/DE102007018412B4/de not_active Expired - Fee Related
• 2008
  • 2008-03-18 RU RU2008110467/12A patent/RU2377773C2/ru not_active IP Right Cessation
  • 2008-04-15 WO PCT/EP2008/002971 patent/WO2008125332A2/de active Application Filing

Patent Citations (3)

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