WO2001065925A1 - Device for raising and lowering of net pen - Google Patents

Device for raising and lowering of net pen Download PDF

Info

Publication number
WO2001065925A1
WO2001065925A1 PCT/NO2001/000101 NO0100101W WO0165925A1 WO 2001065925 A1 WO2001065925 A1 WO 2001065925A1 NO 0100101 W NO0100101 W NO 0100101W WO 0165925 A1 WO0165925 A1 WO 0165925A1
Authority
WO
WIPO (PCT)
Prior art keywords
net pen
air
net
pen
wires
Prior art date
Application number
PCT/NO2001/000101
Other languages
French (fr)
Inventor
Jonny Pettersen
Svein H. JØRGENSEN
Kjell Midling
Kåre AAS
Roy Tore Eliassen
Original Assignee
Refa 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 Refa As filed Critical Refa As
Priority to AU2001242888A priority Critical patent/AU2001242888A1/en
Publication of WO2001065925A1 publication Critical patent/WO2001065925A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/60—Floating cultivation devices, e.g. rafts or floating fish-farms
    • 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

Definitions

  • the present invention relates to a system for raising and lowering fish farming net pens in floating cages, for the purpose of operation, safety and maintenance.
  • parasites such as salmon-infesting and cod-infesting sealice
  • sealice live off blood and tissue fluids and cause skin lesions which expose the fish to fungus, virus and bacterial infections. Such infections often result in disease and death.
  • the fish will show increasing difficulty in mamtaining its own entothermic ionic balance, a condition which can lead to failing health and death.
  • the lesions caused by the sea lice also result in a downgrading of the fish. In fish farming, this problem is well known and entails severe financial losses.
  • Debusing is effected by reducing the volume of the net pen to bring the fish closer together and introducing delousing products, or by mechanical debusing (water jet flushing or mechanical scraping).
  • the raising of the net pen is effected mechanically (pulling in the net pen rope by hand, or with the use of a crane, a winch or the like).
  • This is heavy and time-consuming work which, in addition, can result in damage to the net pens, the fish cages etc.
  • Such operations can cause tearing of the pen with ensuing escape of the farmed fish into the wild. Escape of farmed fish is also considered a problem for the population of wild salmon as it increases competition for spawning grounds in salmon rivers and promotes undesirable genetic crossings.
  • pulling up net pens by hand can be the cause strain injuries to back, arms etc. to people in the business.
  • ballast blocks can, for instance, be attached to the bottom rope edging of the net pen.
  • the blocks are also connected to the surface by a rope (rope tightener) so that they can be lifted or to allow adjustment of the ballast weight on the net pen. This can be effected in accordance with the conditions at the farming location or to suit the effects of the environment.
  • a new system involves attaching the rope edging of the net pen to a ring which consists of a self-buoyant tubing or an air-filled tube, or of buoyant material (polystyrene).
  • This ring is fastened to a surface-floating ring (a well known system) with slide rods and the necessary buoyancy elements (floats, cork, etc.) which slide along the slide rods and are attached to the net pen.
  • the principle was made known in the Norwegian patent application no.19990660. Raising and lowering are effected by means of air-regulated ballast blocks which are controlled through a device (tube, hose) which can be operated from the surface.
  • the air- regulated ballast block may be a tank filled with a combination of air, water and weights, or the tank having a density which corresponds to that of a weight, the tank being regulated by filling in and letting out air through a supply from the surface.
  • the pen can be closed into a cylindrical unit and the slide rods can be extended so as to allow the lowering of the net pen below the danger zone in the event of an outbreak of toxic algae, of freezing water surface. etc.
  • Figure 1 shows a net pen equipped with the device of the invention.
  • Figure 2 shows the same net pen as figure 1, but with the pen partially raised towards the surface.
  • FIG. 3 illustrates the design of an air-regulated ballast block.
  • a floating ring 1 is equipped with a net pen 2 which hangs under it.
  • the net pen 2 is a fish farming net pen of a conventional design.
  • To the floating ring 1 is attached one extremity of several wires 3 which are regularly spaced around it, while the opposite extremity is secured to a weight 4.
  • the wires 3 are thus hanging in the water on the outside of the net pen 2.
  • a bottom ring 6 is secured to the lowest end of the net pen 2 and slides along the wires 3 by means of slide rings 7. Below the bottom ring 6, and attached to it, a buoyancy device is provided in the form of an air-regulated ballast block 8. The buoyancy of the air-regulated ballast block 8 can be adjusted to lift the bottom ring 6 and the net pen, and the volume of the net pen 2 is reduced as the latter rises to the surface.
  • Figure 2 illustrates how the floats 5 meet one another on the wires 3 as the net pen 2 folds (not shown in details on the figure), such folds extending towards the inside of the net pen 2.
  • the air-regulated ballast block 8 can be designed as illustrated on figures 3 a and b.
  • figure 3 a it appears as a hollow tank made, for example, of thick steel plates which in themselves would act as ballast.
  • an opening 9 for air is provided, receiving air from the surface through a hose 10.
  • one or more water intakes 11 are provided. These are always open and sea water will enter the tank or be evacuated from the tank as air is supplied to the tank or evacuated through the opening 9.
  • the weight of the tank by itself and the quantity of water in the tank will pull the air-regulated ballast block 8, the bottom ring 6 and the net pen 2 downward, while the quantity of air in the air-regulated ballast block 8 will create a flotational force together with the buoyancy of the bottom ring 6 and of the floats 5.
  • By regulating the intake and outlet of air to and from the tank it will be possible to regulate the flotational force of the system and thus raise or lower the net pen 2.
  • the air-regulated ballast block 8 can be designed in various ways, an alternative embodiment being illustrated in figure 3b.
  • the tank may be made of plastic with a low density.
  • a channel 12 is provided which can be reached from above.
  • weights can be introduced in a desired number and having the required mass to obtain the necessary downward force.
  • the wires 3 can be attached to points above the floating ring, above the surface of the water, in such a manner that, as the net pen 2 rises, the floats 5 will be pushed to the surface by their own buoyancy and subsequently be lifted or pushed above the surface by the other floats 5 which follow in their upward displacement. In this manner, the base of the net pen can be lifted even further.

Abstract

A net pen (2) and wires (3) attached to a floating ring (1). To the wires (3) a weight (4) is fastened and a bottom ring (6) slides along the wires (3). Floats (5) are sliding along the wires (3) and are attached to the net pen (2). An air-regulated ballast block (8) is secured to the bottom ring (6). The air-regulated ballast block (8) is designed like a tank provided with an opening (9) for air and with water intakes (11).

Description

DEVICE FOR RAISING AND LOWERING OF NET PEN The present invention relates to a system for raising and lowering fish farming net pens in floating cages, for the purpose of operation, safety and maintenance.
In fish farming, parasites (such as salmon-infesting and cod-infesting sealice) are the cause of extensive financial losses. This is due to the fact that sealice live off blood and tissue fluids and cause skin lesions which expose the fish to fungus, virus and bacterial infections. Such infections often result in disease and death. Furthermore, the fish will show increasing difficulty in mamtaining its own entothermic ionic balance, a condition which can lead to failing health and death. The lesions caused by the sea lice also result in a downgrading of the fish. In fish farming, this problem is well known and entails severe financial losses. The sea lice live planktomcally, i.e. the parasites drift freely in the water. The concentrations of planktonic sea lice which spread with the currents often cause infestation of anadromous wild fish as they migrate in search of food in the sea. In Norway, such conditions will expose the fry of salmon, sea trout and char to serious parasitic infestation by salmon-infesting sea lice. The spawning salmon (multiple spawner - non-migrating salmon) are also adversely affected by the salmon-infesting sea lice as they migrate in search of food. This is due to the fact that a parasitic infestation reduces the chances of growth for the salmon. Sea lice can also drift in the water from a fish farm to another and infest those. Today, fish farms are deloused on a regular basis or when the concentration of sea lice increases in the farm. Debusing is effected by reducing the volume of the net pen to bring the fish closer together and introducing delousing products, or by mechanical debusing (water jet flushing or mechanical scraping). Today, the raising of the net pen is effected mechanically (pulling in the net pen rope by hand, or with the use of a crane, a winch or the like). This is heavy and time-consuming work which, in addition, can result in damage to the net pens, the fish cages etc. Such operations can cause tearing of the pen with ensuing escape of the farmed fish into the wild. Escape of farmed fish is also considered a problem for the population of wild salmon as it increases competition for spawning grounds in salmon rivers and promotes undesirable genetic crossings. In addition, pulling up net pens by hand can be the cause strain injuries to back, arms etc. to people in the business.
The conventional design of a floating cage for fish is a net pen fixed to a floating ring. The floating cage looks therefore like a baggy net which hangs freely in the water. To force the net pen to keep a constant volume despite the influence of currents, the pen is weighted down with ballast blocks. These blocks can, for instance, be attached to the bottom rope edging of the net pen. The blocks are also connected to the surface by a rope (rope tightener) so that they can be lifted or to allow adjustment of the ballast weight on the net pen. This can be effected in accordance with the conditions at the farming location or to suit the effects of the environment. A new system involves attaching the rope edging of the net pen to a ring which consists of a self-buoyant tubing or an air-filled tube, or of buoyant material (polystyrene). This ring is fastened to a surface-floating ring (a well known system) with slide rods and the necessary buoyancy elements (floats, cork, etc.) which slide along the slide rods and are attached to the net pen. The principle was made known in the Norwegian patent application no.19990660. Raising and lowering are effected by means of air-regulated ballast blocks which are controlled through a device (tube, hose) which can be operated from the surface. The air- regulated ballast block may be a tank filled with a combination of air, water and weights, or the tank having a density which corresponds to that of a weight, the tank being regulated by filling in and letting out air through a supply from the surface. The use of this type of system provides a controlled lifting device for bringing the net pen to the surface without any extreme strain on the net pen rope and thus avoiding tearing of the net and escaping fish. In addition, due to the system, the working personnel avoid unnecessary heavy work and strain injuries. As regards parasites, the system of the present invention presents great ease of use. The debusing operation will only require a fraction of the resources which are involved with today's debusing systems. It is anticipated that debusing in fish farms will increase in effectiveness by allowing much easier operation of the fish cages. In addition, the system can help to reduce the effect of waves, thus further preventing tearing of the pen. The pen can be closed into a cylindrical unit and the slide rods can be extended so as to allow the lowering of the net pen below the danger zone in the event of an outbreak of toxic algae, of freezing water surface. etc.
The object of the present invention is to provide a system offering the following characteristics:
- controlled raising and lowering of net pens in fish floating cages with air-regulated ballast block , - a submersible net pen for operation under the surface of the water on a permanent and/or on a temporary basis by turning the net pen into a closed unit,
- easier compression of the net pen volume for the purpose of anti- parasitic treatment, scooping up fish, sorting etc., - reducing tearing of the net pen, strain injuries in personnel and wear and tear of equipment,
- reducing the adverse effect on the environment by minimizing the escape of farmed fish and achieving a more efficient anti-parasitic treatment. This is achieved by means of a bottom ring attached to wires by slide rings, the bottom ring being mounted in the vicinity of the closed end of the net pen and equipped to raise the net pen towards the floating ring with the help of an air- regulated ballast block.
Further details of the invention appear from the following description of a preferred embodiment of the invention with reference to the illustrations. Figure 1 shows a net pen equipped with the device of the invention.
Figure 2 shows the same net pen as figure 1, but with the pen partially raised towards the surface.
Figure 3 illustrates the design of an air-regulated ballast block.
A floating ring 1 is equipped with a net pen 2 which hangs under it. The net pen 2 is a fish farming net pen of a conventional design. To the floating ring 1 is attached one extremity of several wires 3 which are regularly spaced around it, while the opposite extremity is secured to a weight 4. The wires 3 are thus hanging in the water on the outside of the net pen 2. On each of these wires 3, several floats 5 are mounted, these being also attached to the vertical side of the net pen 2.
A bottom ring 6 is secured to the lowest end of the net pen 2 and slides along the wires 3 by means of slide rings 7. Below the bottom ring 6, and attached to it, a buoyancy device is provided in the form of an air-regulated ballast block 8. The buoyancy of the air-regulated ballast block 8 can be adjusted to lift the bottom ring 6 and the net pen, and the volume of the net pen 2 is reduced as the latter rises to the surface. Figure 2 illustrates how the floats 5 meet one another on the wires 3 as the net pen 2 folds (not shown in details on the figure), such folds extending towards the inside of the net pen 2.
The air-regulated ballast block 8 can be designed as illustrated on figures 3 a and b. In figure 3 a, it appears as a hollow tank made, for example, of thick steel plates which in themselves would act as ballast. At the upper end of the air- regulated ballast block 8, and closest to the surface of the sea, an opening 9 for air is provided, receiving air from the surface through a hose 10. At the opposite end of the air-regulated ballast block 8 one or more water intakes 11 are provided. These are always open and sea water will enter the tank or be evacuated from the tank as air is supplied to the tank or evacuated through the opening 9. The weight of the tank by itself and the quantity of water in the tank will pull the air-regulated ballast block 8, the bottom ring 6 and the net pen 2 downward, while the quantity of air in the air-regulated ballast block 8 will create a flotational force together with the buoyancy of the bottom ring 6 and of the floats 5. By regulating the intake and outlet of air to and from the tank, it will be possible to regulate the flotational force of the system and thus raise or lower the net pen 2.
The air-regulated ballast block 8 can be designed in various ways, an alternative embodiment being illustrated in figure 3b. The tank may be made of plastic with a low density. At the centre of the tank a channel 12 is provided which can be reached from above. In the channel 12, weights can be introduced in a desired number and having the required mass to obtain the necessary downward force. As an alternative, the wires 3 can be attached to points above the floating ring, above the surface of the water, in such a manner that, as the net pen 2 rises, the floats 5 will be pushed to the surface by their own buoyancy and subsequently be lifted or pushed above the surface by the other floats 5 which follow in their upward displacement. In this manner, the base of the net pen can be lifted even further.

Claims

1. Device for raising and lowering a net pen comprising a floating ring to which are attached a net pen and wires with a ballast block, characterized by a bottom ring (6) attached to wires (3) by slide rings (7), the bottom ring (6) being mounted in the vicinity of the closed end of the net pen (2) and equipped to raise the net pen (2) towards the floating ring (1) with the help of an air-regulated ballast block (8).
2. The device for raising and lowering a net pen of claim 1, characterized in that the vertical sides of the net pen (2) are in several places fastened to floats (5) which slide along the wires (3) .
3. The device for raising and lowering a net pen of claim 1, characterized in that the air-regulated ballast block (8) is shaped like a tank with an opening (9) for air and at least one water intake (11).
4. The device for raising and lowering a net pen of claim 1, characterized in that the air-regulated ballast block (8) is shaped like a tank with an opening (9) for air and at least one water intake (11) and a channel (12).
PCT/NO2001/000101 2000-03-08 2001-03-08 Device for raising and lowering of net pen WO2001065925A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001242888A AU2001242888A1 (en) 2000-03-08 2001-03-08 Device for raising and lowering of net pen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20001217A NO20001217L (en) 2000-03-08 2000-03-08 Device for raising and lowering net bag
NO20001217 2000-03-08

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003063583A2 (en) * 2002-02-01 2003-08-07 Subsea Shellfish Ltd Cultivation and harvesting of shellfish
GB2391443A (en) * 2002-07-31 2004-02-11 Pso Automek As Recycling fish feed in fish farms
ES2229848A1 (en) * 2002-07-05 2005-04-16 Andres Quinta Cortiñas Fish breeding device, has mesh wall folded between pontoon and armor when pontoon is lifted to surface, and upward vertical guides provided on pontoon, where base of pontoon is equipped with armor
HRP20040212B1 (en) * 2004-03-03 2008-03-31 Ćapin Ljubomir Keepnet for the culture of fish and mussels
FR2909070A1 (en) * 2006-11-27 2008-05-30 Maret Helene Masson Sea bath facilitating device for use with boat, has bath protecting basin presented in form of closed and interlocked mesh shaped net and provided with lateral walls, where device is integrated at rear part of boat by lateral attachments
EP2144496A1 (en) * 2007-05-04 2010-01-20 Aquaculture Engineering Group INC. Improved aquaculture system
ES2337221A1 (en) * 2007-08-30 2010-04-21 Juan Jose Crespo Verdu Nautical security network device for bathing in an aquatic environment. (Machine-translation by Google Translate, not legally binding)
WO2011098840A1 (en) * 2010-02-15 2011-08-18 Ocean Nets Limited Rapid deployment fish cage enclosure
WO2012007947A1 (en) * 2010-07-13 2012-01-19 Bio Booot Ltd. System for breeding aquatic fauna
NO20130703A1 (en) * 2013-05-21 2014-08-04 Aqualine As System at fish farms.
EP2893804A4 (en) * 2012-09-03 2015-11-25 Ecosea Farming S A Reservoir-cage submersion system for the culture and/or containment of hydrobiological species
CN107155989A (en) * 2017-06-02 2017-09-15 马导利 Aquaculture device
CN107318729A (en) * 2017-09-04 2017-11-07 来安县天绿生态农业科技有限公司 A kind of fish culture box
WO2018091431A1 (en) 2016-11-15 2018-05-24 Marine Constructions As Net for submersible marine fish pen
GB2558302A (en) * 2016-12-29 2018-07-11 Alexander Bruce George Aquaculture apparatus and methods
CN108377984A (en) * 2018-02-07 2018-08-10 湖北海洋工程装备研究院有限公司 A kind of combined type netting system
CN112314492A (en) * 2020-11-03 2021-02-05 哈尔滨工程大学 Automatic folding netting system and operation method
CN113273528A (en) * 2021-06-24 2021-08-20 安徽农业大学 Outdoor aquaculture catches and uses aquaculture net and cursory structure
US20220061277A1 (en) * 2018-09-13 2022-03-03 Spring Innovation As A raiseable floating structure and a method for raising the same in a water column

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO344480B1 (en) * 2018-07-10 2020-01-13 Roxel Aqua As Breeding cage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996002132A1 (en) * 1994-07-13 1996-02-01 Campbeltown Developments Limited Improvements in or relating to fish farms
US5617813A (en) * 1995-03-31 1997-04-08 Ocean Spar Technologies, Llc Anchorable mobile spar and ring fish pen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996002132A1 (en) * 1994-07-13 1996-02-01 Campbeltown Developments Limited Improvements in or relating to fish farms
US5617813A (en) * 1995-03-31 1997-04-08 Ocean Spar Technologies, Llc Anchorable mobile spar and ring fish pen

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003063583A2 (en) * 2002-02-01 2003-08-07 Subsea Shellfish Ltd Cultivation and harvesting of shellfish
WO2003063583A3 (en) * 2002-02-01 2003-12-31 Subsea Shellfish Ltd Cultivation and harvesting of shellfish
ES2229848A1 (en) * 2002-07-05 2005-04-16 Andres Quinta Cortiñas Fish breeding device, has mesh wall folded between pontoon and armor when pontoon is lifted to surface, and upward vertical guides provided on pontoon, where base of pontoon is equipped with armor
GB2391443A (en) * 2002-07-31 2004-02-11 Pso Automek As Recycling fish feed in fish farms
HRP20040212B1 (en) * 2004-03-03 2008-03-31 Ćapin Ljubomir Keepnet for the culture of fish and mussels
FR2909070A1 (en) * 2006-11-27 2008-05-30 Maret Helene Masson Sea bath facilitating device for use with boat, has bath protecting basin presented in form of closed and interlocked mesh shaped net and provided with lateral walls, where device is integrated at rear part of boat by lateral attachments
EP2144496A1 (en) * 2007-05-04 2010-01-20 Aquaculture Engineering Group INC. Improved aquaculture system
EP2144496A4 (en) * 2007-05-04 2011-12-14 Aquaculture Engineering Group Inc Improved aquaculture system
ES2337221A1 (en) * 2007-08-30 2010-04-21 Juan Jose Crespo Verdu Nautical security network device for bathing in an aquatic environment. (Machine-translation by Google Translate, not legally binding)
WO2011098840A1 (en) * 2010-02-15 2011-08-18 Ocean Nets Limited Rapid deployment fish cage enclosure
WO2012007947A1 (en) * 2010-07-13 2012-01-19 Bio Booot Ltd. System for breeding aquatic fauna
US8770149B2 (en) 2010-07-13 2014-07-08 Bio Booot Ltd. System for breeding aquatic fauna
EP2893804A4 (en) * 2012-09-03 2015-11-25 Ecosea Farming S A Reservoir-cage submersion system for the culture and/or containment of hydrobiological species
NO20130703A1 (en) * 2013-05-21 2014-08-04 Aqualine As System at fish farms.
WO2018091431A1 (en) 2016-11-15 2018-05-24 Marine Constructions As Net for submersible marine fish pen
EP4305957A2 (en) 2016-11-15 2024-01-17 Marine Constructions AS Submersible marine fish pen arrangement and method
GB2558302A (en) * 2016-12-29 2018-07-11 Alexander Bruce George Aquaculture apparatus and methods
GB2558302B (en) * 2016-12-29 2020-07-29 Alexander Bruce George Aquaculture apparatus and methods
CN107155989A (en) * 2017-06-02 2017-09-15 马导利 Aquaculture device
CN107318729A (en) * 2017-09-04 2017-11-07 来安县天绿生态农业科技有限公司 A kind of fish culture box
CN108377984A (en) * 2018-02-07 2018-08-10 湖北海洋工程装备研究院有限公司 A kind of combined type netting system
US20220061277A1 (en) * 2018-09-13 2022-03-03 Spring Innovation As A raiseable floating structure and a method for raising the same in a water column
CN112314492A (en) * 2020-11-03 2021-02-05 哈尔滨工程大学 Automatic folding netting system and operation method
CN112314492B (en) * 2020-11-03 2021-05-04 哈尔滨工程大学 Automatic folding netting system and operation method
CN113273528A (en) * 2021-06-24 2021-08-20 安徽农业大学 Outdoor aquaculture catches and uses aquaculture net and cursory structure

Also Published As

Publication number Publication date
AU2001242888A1 (en) 2001-09-17
NO20001217L (en) 2001-09-19
NO20001217D0 (en) 2000-03-08

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