WO2002074075A1 - A method and a device for a fish corral - Google Patents

A method and a device for a fish corral Download PDF

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Publication number
WO2002074075A1
WO2002074075A1 PCT/NO2002/000096 NO0200096W WO02074075A1 WO 2002074075 A1 WO2002074075 A1 WO 2002074075A1 NO 0200096 W NO0200096 W NO 0200096W WO 02074075 A1 WO02074075 A1 WO 02074075A1
Authority
WO
WIPO (PCT)
Prior art keywords
corral
bag
electrically conductive
poles
voltage
Prior art date
Application number
PCT/NO2002/000096
Other languages
French (fr)
Inventor
Terje Hjertvikrem
Original Assignee
Seafarm Development 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 Seafarm Development As filed Critical Seafarm Development As
Publication of WO2002074075A1 publication Critical patent/WO2002074075A1/en

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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
    • 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

  • This invention relates to a method of preventing unwanted organisms from affecting, in a disturbing manner, marine farming facilities, e.g. of the kind usually placed in the sea.
  • the invention also comprises a device for practicing the method.
  • a farming plant based on corrals is disturbed by many plants and organisms. Sea plants and shellfish attach to the mesh of the corral bag and as a result the bag must be taken up, washed and proofed. Animals and birds help themselves to the farmed fish, often with relatively large economic consequences.
  • the outer layer In a two-layer or double bag according to known technique, also the outer layer must be of a relatively fine mesh in order to achieve the desired effect. The result of this is that the corral bags will be relatively heavy and expensive. It has turned out to be difficult to achieve a uniform voltage distribution in the live conductive bags.
  • the invention has as its object to remedy the drawbacks of know technique.
  • an electrically conductive corral bag of a kind known in itself is arranged an outer conductive corral bag of a preferably coarse mesh width.
  • the corral bags are provided with pulsing voltage of opposite polarities, so that when the outer bag has a positive polarity, the inner bag has a negative polarity.
  • a electrical field is created in the annular space formed between the outer and the inner corral bags, whereby all organisms present in this area at least will feel uncomfortable and move away.
  • a further measure, taken in particular to prevent animals from reaching the corral, is to arrange vertical conductive poles in the sea, distributed along a circle surrounding the corral bag(s) at a certain distance.
  • the poles are supplied with voltage of a polarity opposite of that of the outer bag.
  • the electrical field created between the outer bag and the poles will at least also feel unpleasant to the animals present in the area.
  • corral bags electrically conductive like weaving copper wire and/or coal fibre into the mesh, or proofing with carboniferous material
  • the poles comprise a conductive material, for example copper, coated with thermoplastics, to which a filler of electrically conductive material, e.g. carbon powder, has been added.
  • a coating of limited conductivity By using a coating of limited conductivity, the induction of great currents by short-circuiting between the bags and/or poles is prevented.
  • the voltage level and pulse frequency may be varied within wide limits, but a direct voltage of 8 volts with 35 relatively short pulses per minute by a distance of approximately one metre between the corral bags, a corral bag and poles, respectively, has proved effective. The voltage may be so high that fish would die on contact with the bag.
  • Fig. 1 shows schematically inner and outer corral bags floating in the sea, and encircling the corral bags and extending from the sea surface downwards there are a number of vertical poles.
  • the reference numeral 1 identifies an inner conductive corral bag of a kind known in itself. Surrounding the inner bag and spaced therefrom, is positioned an outer corral bag 2. The distance between the bags must be adjusted according to the voltage level, but is typically in the order of one metre.
  • a number of vertical electrically conductive poles 4 are arranged.
  • the poles 4 are electrically connected by means of wires 6 and further connected to a voltage generator, not shown, through a wire C.
  • the two corral bags 1, 2 are connected to the same voltage generator through respective wires A and B.
  • the electrical field results in a decomposing of the water into oxygen, i.a.
  • the liberated oxygen contributes to a favourable growing environment for the fish.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Mechanical Means For Catching Fish (AREA)
  • Electrotherapy Devices (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

A method and device for preventing unwanted organisms from affecting, in a disturbing manner, marine farming facilities of the kind placed in the sea, in which, surrounding an electrically conductive corral bag (1) at a certain distance, there is arranged an outer corral bag (2), and in which the outer corral bag (2) has been made electrically conductive, and in which, surrounding the two corral bags (1, 2), a number of electrically conductive poles (4) are arranged, pointing from the sea surface downwards, the external corral bag (2) being supplied with a preferably pulsing electrical voltage of one polarity, whereas the inner corral bag (1) and the poles (4) are supplied with voltage of an opposite polarity.

Description

A METHOD AND A DEVICE FOR A FISH CORRAL
This invention relates to a method of preventing unwanted organisms from affecting, in a disturbing manner, marine farming facilities, e.g. of the kind usually placed in the sea. The invention also comprises a device for practicing the method.
A farming plant based on corrals is disturbed by many plants and organisms. Sea plants and shellfish attach to the mesh of the corral bag and as a result the bag must be taken up, washed and proofed. Animals and birds help themselves to the farmed fish, often with relatively large economic consequences.
Another problem is that farmed fish escape from the corral bag for reasons such as a faulty bag, faulty floats and bad weather. In addition to being economically undesirable, such a loss of fish is also of concern in that the farmed fish is allowed to mingle with wild fish. Several measures to alleviate and overcome this disturbance have been tried on a smaller scale. The use of a double- walled corral bag is known, and also the use of two independent bags, one on the outside of the other, in order to prevent the escape of fish from the bag and the entrance of external animals. Further, it is known to make the corral bag conductive, and apply a voltage to prevent fouling of the mesh of the bag, and thereby, at the same time, also scare animals and wild fish away from the corral.
In a two-layer or double bag according to known technique, also the outer layer must be of a relatively fine mesh in order to achieve the desired effect. The result of this is that the corral bags will be relatively heavy and expensive. It has turned out to be difficult to achieve a uniform voltage distribution in the live conductive bags.
Consequently, the fouling is only partially inhibited, and in some cases it has also led to death of fish.
The invention has as its object to remedy the drawbacks of know technique.
The object is achieved, according to the invention, through the features indicated in the description below and in the following Claims.
Surrounding, at a certain distance, an electrically conductive corral bag of a kind known in itself, is arranged an outer conductive corral bag of a preferably coarse mesh width. In a preferred embodiment the corral bags are provided with pulsing voltage of opposite polarities, so that when the outer bag has a positive polarity, the inner bag has a negative polarity. Thereby a electrical field is created in the annular space formed between the outer and the inner corral bags, whereby all organisms present in this area at least will feel uncomfortable and move away. By the fact that the inner corral bag is supplied only with voltage of one polarity at a time, no harmful voltage fields will be created within the bag.
A further measure, taken in particular to prevent animals from reaching the corral, is to arrange vertical conductive poles in the sea, distributed along a circle surrounding the corral bag(s) at a certain distance.
The poles are supplied with voltage of a polarity opposite of that of the outer bag. The electrical field created between the outer bag and the poles will at least also feel unpleasant to the animals present in the area.
Known methods of making corral bags electrically conductive, like weaving copper wire and/or coal fibre into the mesh, or proofing with carboniferous material, may be used with advantage. The poles comprise a conductive material, for example copper, coated with thermoplastics, to which a filler of electrically conductive material, e.g. carbon powder, has been added. By using a coating of limited conductivity, the induction of great currents by short-circuiting between the bags and/or poles is prevented. The voltage level and pulse frequency may be varied within wide limits, but a direct voltage of 8 volts with 35 relatively short pulses per minute by a distance of approximately one metre between the corral bags, a corral bag and poles, respectively, has proved effective. The voltage may be so high that fish would die on contact with the bag. In the following is described a non-limiting example of a preferred embodiment which is visualized in the single accompanying drawing, in which:
Fig. 1 shows schematically inner and outer corral bags floating in the sea, and encircling the corral bags and extending from the sea surface downwards there are a number of vertical poles.
In the drawing the reference numeral 1 identifies an inner conductive corral bag of a kind known in itself. Surrounding the inner bag and spaced therefrom, is positioned an outer corral bag 2. The distance between the bags must be adjusted according to the voltage level, but is typically in the order of one metre.
Surrounding the corral bags 1, 2 extending from the sea surface downwards, a number of vertical electrically conductive poles 4 are arranged. The poles 4 are electrically connected by means of wires 6 and further connected to a voltage generator, not shown, through a wire C. The two corral bags 1, 2 are connected to the same voltage generator through respective wires A and B.
Necessary floating and securing elements for the bags 1, 2 and poles 4 are not shown.
When voltage is applied to the corral bags 1, 2 and poles 4, e.g. positive polarity to the outer bag 2 and negative polarity to the inner bag 1 and the poles '4, the electrical fields created between the electrically charged devices of opposite polarities, will be uncomfortable to the living organisms, e.g. shellfish, animals, fish and birds present in the fields, whereby they will stay away from the regions in question. This results in a considerable reduction in the fouling of the corral bags 1, 2.
The electrical field results in a decomposing of the water into oxygen, i.a. The liberated oxygen contributes to a favourable growing environment for the fish.

Claims

C L A I M S
A method of preventing unwanted organisms from affecting, in a disturbing manner, marine farming facilities of the kind placed in the sea, in which, surrounding an electrically conductive corral bag (1) at a certain distance, there is arranged an outer corral bag (2), c h aracter i z ed in that the outer corral bag (2) has been made electrically conductive, and that the external corral bag (2) is supplied with preferably pulsing electrical voltage of one polarity, whereas the inner corral bag ( 1 ) is supplied with voltage of an opposite polarity.
A method according to claim 1, c h ar acter i z ed i n that, surrounding one or two corral bags (1, 2) and pointing from the sea surface downwards, a number of electrically conductive poles (4) are arranged, and the external corral bag (2) is supplied with a preferably pulsing electrical voltage of one polarity, whereas the poles (4) are supplied with voltage of an opposite polarity.
A device for preventing unwanted organisms from affecting, in a disturbing manner, marine farming facilities of the kind placed in the sea, in which, surrounding an electrically conductive corral bag (1) at a certain distance, there is an outer corral bag (2), c har acteri z ed in that the outer corral bag (2) is electrically conductive, and that the two corral bags (1, 2) are connected to a voltage source through wires (A, B) . A device for preventing unwanted organisms from affecting, in a disturbing manner, marine farming facilities of the kind placed in the sea, c harac teri z ed in that from the sea surface downwards, surrounding an electrically conductive corral bag (1) at a certain distance, there are a number of electrically conductive poles (4), the poles (4) being electrically connected through wires (6), and the corral bag (1) and the poles (4) being connected through wires (A, C) to a voltage source.
PCT/NO2002/000096 2001-03-08 2002-03-07 A method and a device for a fish corral WO2002074075A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20011176 2001-03-08
NO20011176A NO313931B1 (en) 2001-03-08 2001-03-08 Method and arrangement of cages

Publications (1)

Publication Number Publication Date
WO2002074075A1 true WO2002074075A1 (en) 2002-09-26

Family

ID=19912230

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2002/000096 WO2002074075A1 (en) 2001-03-08 2002-03-07 A method and a device for a fish corral

Country Status (2)

Country Link
NO (1) NO313931B1 (en)
WO (1) WO2002074075A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013095021A1 (en) * 2011-12-21 2013-06-27 National Fisheries Research And Development Institute Integrated multi-trophic aquaculture system with tourism purpose
WO2014033535A2 (en) 2012-08-31 2014-03-06 Nexans Cable electrode system for a device for reduction of unwanted organisms in a fish and/or shellfish corral/farm
WO2014054951A1 (en) * 2012-10-01 2014-04-10 Sfd As Electrical fence and use of the same in a fish farm
WO2015154202A1 (en) * 2014-04-10 2015-10-15 Ecosea Farming S.A. Electric barrier system for reduction of pathogens.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO327350B1 (en) * 2007-09-18 2009-06-15 Sfd As Method and device for reducing exposure to unwanted organisms in a marine fish farm
NO20100087A1 (en) * 2010-01-19 2011-03-07 Olsen Torbjoern Device for breeding

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825810A (en) * 1987-09-16 1989-05-02 Sharber Norman G Electric barrier for fish
JPH03224427A (en) * 1990-01-31 1991-10-03 Tonen Corp Algae-proofing fish preserve
US5445111A (en) * 1993-06-22 1995-08-29 Smith-Root, Inc. Electrified fish barriers
US5448968A (en) * 1991-06-27 1995-09-12 Ostlie; Lars Infraacoustic/electric fish fence
JP2000342103A (en) * 1999-06-04 2000-12-12 Ishikawajima Harima Heavy Ind Co Ltd Antifouling method for fish preserving wire net by electro-coating

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825810A (en) * 1987-09-16 1989-05-02 Sharber Norman G Electric barrier for fish
JPH03224427A (en) * 1990-01-31 1991-10-03 Tonen Corp Algae-proofing fish preserve
US5448968A (en) * 1991-06-27 1995-09-12 Ostlie; Lars Infraacoustic/electric fish fence
US5445111A (en) * 1993-06-22 1995-08-29 Smith-Root, Inc. Electrified fish barriers
JP2000342103A (en) * 1999-06-04 2000-12-12 Ishikawajima Harima Heavy Ind Co Ltd Antifouling method for fish preserving wire net by electro-coating

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013095021A1 (en) * 2011-12-21 2013-06-27 National Fisheries Research And Development Institute Integrated multi-trophic aquaculture system with tourism purpose
WO2014033535A2 (en) 2012-08-31 2014-03-06 Nexans Cable electrode system for a device for reduction of unwanted organisms in a fish and/or shellfish corral/farm
WO2014033535A3 (en) * 2012-08-31 2014-04-24 Nexans Cable electrode system for a device for reduction of unwanted organisms in a fish and/or shellfish corral/farm
CN104602513A (en) * 2012-08-31 2015-05-06 尼克桑斯公司 Cable electrode system for a device for reduction of unwanted organisms in a fish and/or shellfish corral/farm
WO2014054951A1 (en) * 2012-10-01 2014-04-10 Sfd As Electrical fence and use of the same in a fish farm
WO2015154202A1 (en) * 2014-04-10 2015-10-15 Ecosea Farming S.A. Electric barrier system for reduction of pathogens.

Also Published As

Publication number Publication date
NO20011176L (en) 2002-09-09
NO313931B1 (en) 2002-12-30
NO20011176D0 (en) 2001-03-08

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