WO1990003729A1 - A breeding facility for marine animals, particularly fish - Google Patents

A breeding facility for marine animals, particularly fish Download PDF

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Publication number
WO1990003729A1
WO1990003729A1 PCT/NO1989/000107 NO8900107W WO9003729A1 WO 1990003729 A1 WO1990003729 A1 WO 1990003729A1 NO 8900107 W NO8900107 W NO 8900107W WO 9003729 A1 WO9003729 A1 WO 9003729A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
tank
fish
well
fish farm
Prior art date
Application number
PCT/NO1989/000107
Other languages
French (fr)
Inventor
Arne Vadseth
Ragnar Vadseth
Original Assignee
Arne Vadseth
Ragnar Vadseth
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 Arne Vadseth, Ragnar Vadseth filed Critical Arne Vadseth
Publication of WO1990003729A1 publication Critical patent/WO1990003729A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K63/00Receptacles for live fish, e.g. aquaria; Terraria
    • A01K63/04Arrangements for treating water specially adapted to receptacles for live fish
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00Culture of aquatic animals
    • A01K61/10Culture of aquatic animals of fish
    • A01K61/13Prevention or treatment of fish diseases
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00Culture of aquatic animals
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K63/00Receptacles for live fish, e.g. aquaria; Terraria
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K63/00Receptacles for live fish, e.g. aquaria; Terraria
    • A01K63/10Cleaning bottoms or walls of ponds or receptacles
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

Definitions

  • the present invention relates to a breeding facility for marine animals, particularly fish, comprising a tank with a preferably circular cross- section designed to be filled with water up to a certain level.
  • the facility may be land-based or may consist of a sealed tank or bag that is submerged in water.
  • the purpose of the present invention is primarily to eliminate the above mentioned disadvantages and to optimize fish farming with regard to both land-based systems and water based facili ⁇ ties.
  • This is achieved according to the invention by a fish farm facility of the type mentioned introductorily, which is charac ⁇ terized by the combination of the following features: a) that it is connected to a circulation pump with an inlet near the bottom of the tank and an outlet near the surface of the water in the tank, b) that it is connected to a supply pipe or pipes for fresh water and a discharge pipe to provide for a renewal of the water over time, c) that the inlet from the pump is directed tangentially or approximately at a tangent within the tank to provide a constant, circulating current in the water, d) that in the bottom there is provided a well for collection of excrements and feed remains and other impurities, and e) that to the well is connected a suction pipe for the removal of the impurities.
  • the air lift pump By circulating the water through an air lift pump one can achieve purification of the water.
  • the air lift pump func ⁇ tions by blowing in large quantities of air that rise up through a vertical pipe as bubbles.
  • the fish take in oxygen from the water by means of their gills and discharge CO-, together with urinary products, particularly in the form of ammonia.
  • the CO-, gas When water containing CO-, and ammonia is sucked into the air lift pump, the CO-, gas will be taken up by the rising air bubbles.
  • the same thing will happen to some extent with regard to ammonia and other substances. , The most important thing, however, is that the water is ridded of CO-,.
  • This air that flows in at the sur ⁇ face of the tank is air-enriched so that one constantly obtains a new supply of oxygen-enriched water.
  • the water in the fish farm is thus circulated the entire time and is freed of CO-, and en ⁇ riched with air. Smaller amounts of new water are being supplied the whole time, essentially in order to hold the ammonia content in the water at an acceptable level. Because there are used only small amounts of fresh water, it would be expedient to maintain a higher temperature in the system, at least in certain periods of the year.
  • a heat pump can be used, inasmuch as the heat in the discharged water and/or the heat in the surround ⁇ ing water can be utilized, in the case of a water-based system.
  • the fish farm in accordance with the invention would in addition be very suitable as a land-based facilit ⁇ ', which is quite advan ⁇ tageous from the point of view of several other conditions.
  • Th objections to a land-based system have been that pumping of flow ing water from a nearby water source has been very demanding i terms of energy.
  • th water circulates through the air lift pump without requiring an energy to lift the water, and fresh water is added in only smal amounts, which thus requires little energy.
  • the system is totall controlled with regard to any strain on the outside environment, and also with regard to the influence of the outside environmen on the fish within the facility.
  • the small amount of wate that is necessary in order to replenish the water in the tank could be taken from remote places; if, for example, the surface water is polluted or too cold or too warm, the water can be taken from deeper lying layers. Due to the fact that we are talking about small amounts of water, the pumping costs would be rela ⁇ tively modest.
  • the system has been the object of particular interest in areas where warm ground water is found.
  • a fish farm according to the invention located in an area where there is access to warm ground water, consumer fish of very valuable types that have a high price on the market can be farmed.
  • the sturgeon requires a water temperature of about 25 C, and this can very easily be obtained with the aid of warm ground water in Southern European countries where there is rich access to warm ground water at a relatively modest depth below the ground level.
  • carp pools may be attached to the system.
  • the pipe from the well that is placed at the bottom leads to the carp pool, and the same per ⁇ tains to water from the outlet from the tank-.
  • These pipes will carry large quantities of nutrients to the water in the carp pools.
  • the carp in a carp pool are not given feed, but live ex ⁇ clusively on the vegetation that grows in the carp pool. In order to achieve sufficient growth, large quantities of nutrients must be added. In accordance with the invention these nutrients can be supplied at no cost from the fish farm.
  • Figure 1 shows the fish farm seen in perspective with some of the wall cut away
  • Figure 2 shows the fish farm seen from directly above.
  • the fish farm according to the invention consists of a tank 1 with a circular wall 2 and a bottom 3.
  • an air lif pump 4 with an intake 5 at the bottom of the tank 1.
  • the outlet 6 from the air lift pump passes through the wall of the tank in the proximity of the surface 7 of the water fill in the tank.
  • the inlet pipe 8 is directed tangentially within the tank so that a whirlpool current is formed in the water in the tank, as shown with arrows 9.
  • the water level in the tank is regulated by an overflow pipe 10. Air to the air lif pump is supplied through an air conduit 11 and water supply for renewal of the water in the tank is brought in through the pipes 12.
  • a well 13 haying a filter 14.
  • a suction pipe 15 To the well 13 is connected a suction pipe 15.
  • the air lift pump By means of the air lift pump, continuous circulation of the water in the tank 1 is obtained. At the same time, the water is oxygenated by means of the air bubbles in the air lift pump, and the water is cleaned by virtue of the CO- in the water being taken up in the air bubbles floating up and passing out into the open air. Through the supply pipes the water is renewed over time.
  • the water that is added may be heated to maintain a con ⁇ stant temperature in the water in the tank.
  • the polluted water that runs out from the tank through the overflow pipe 10 can go either to carp pools or to a purifying plant.
  • the pipe 15 that sucks out solid impurities from the well 13 can go to the build ⁇ up of fertilizer or to carp pools for their fertilization. Th whirling current collects pollutants', such as feed remains and excrements from the fish, centrally in the tank, and these will descend and be gathered into the well 13.
  • a fish farming facility There is used a sealed tank or bag, so that no contaminants are brought into the surrounding environment. Excrements and feed remains that descend into the well are pumped to a plant that takes care of these substances as fertilizers.
  • the overflow water which is only very slightly polluted, can be conducted to a conventional purifying plant for waste water. As regards those periods when the fish have been given medication, the tank can be drained completely after the medicating and replenished with fresh water.
  • the water that is contaminated by medicines can be purified in a special facility.

Abstract

A breeding facility (fish farm) for marine animals, particularly fish, comprising a tank (1) with a preferably circular cross-section, designed to be filled with water to a certain level (7). The fish farm comprises the following combination: a) that it is connected to a circulation pump (4) of the air lift type with an inlet (5) near the bottom of the tank (1) and an outlet (6) near the surface (7) of the water in the tank (1), b) that it is connected to a supply pipe or pipes (12) for fresh water and a discharge pipe (10) to provide for a renewal of the water in the tank over time, c) that the inlet (5) from the pump is directed tangentially or approximately tangentially within the tank to provide a constant, circulating current in the water, d) that in the bottom there is provided a well (13) centrally located in the tank for collection of excrements and feed remains and other impurities, and e) that to the well (13) is connected a suction pipe for the removal of impurities.

Description

A BREEDING FACILITY FOR MARINE ANIMALS, PARTICULARLY FISH.
The present invention relates to a breeding facility for marine animals, particularly fish, comprising a tank with a preferably circular cross- section designed to be filled with water up to a certain level. The facility may be land-based or may consist of a sealed tank or bag that is submerged in water.
The majority of breeding facilities for consumer fish found today are so-called fish farm ponds, enclosures which are placed in the sea. These pond enclosures consist of a net bag, and water is renewed with the aid of the natural current in the water. There are consequently some strict limitations with regard to placement of such fish farms since, first of all, there must be sufficient¬ ly strong current — without its being too strong, there must not be too much sea, and it must not be too shallow or too confined. Fish farms of this type put a very heavy strain on the sea envir¬ onment. The fish farms polute to quite a high degree because of excrements from the fish and feed remains that float out into the surrounding water through the walls of the net bag. Fish in captivity are readily susceptible to various diseases and para¬ sites, and large quantities of medicaments are therefore used in connection with the fish farming industry. These medicaments are often administered in the feed, and will spread into the sur¬ rounding water where the medicaments are consumed by wild fish, sea fowl and animals — for example, otters — that hunt the fish in the ponds or outside these enclosures. It is quite conceiv¬ able that resistant groups of bacteria could arise, which could result in irreparable damage to the environment and which might also be transmitted to humans. The fish in the open ponds are moreover vulnerable to contagion from wild fish, and to para¬ sites. Heavy alga growth, high incidence of jellyfish and the like can cause catastrophic death rate of fish in the farming ponds.
The purpose of the present invention is primarily to eliminate the above mentioned disadvantages and to optimize fish farming with regard to both land-based systems and water based facili¬ ties. This is achieved according to the invention by a fish farm facility of the type mentioned introductorily, which is charac¬ terized by the combination of the following features: a) that it is connected to a circulation pump with an inlet near the bottom of the tank and an outlet near the surface of the water in the tank, b) that it is connected to a supply pipe or pipes for fresh water and a discharge pipe to provide for a renewal of the water over time, c) that the inlet from the pump is directed tangentially or approximately at a tangent within the tank to provide a constant, circulating current in the water, d) that in the bottom there is provided a well for collection of excrements and feed remains and other impurities, and e) that to the well is connected a suction pipe for the removal of the impurities.
Additonal features and advantages will be disclosed in the depen¬ dent claims.
Several advantages are achieved by means of the facility in accordance with the invention. First, one gains control of the environment, both in the fish farm itself and — in the case of a water-based system — in the surrounding milieu. The constant whirlpool in the container or tank will collect solid particles centrally at the bottom and will trap them in the well, from which the impurities can be transported out through the suction pipe.
By circulating the water through an air lift pump one can achieve purification of the water. The air lift pump, of course, func¬ tions by blowing in large quantities of air that rise up through a vertical pipe as bubbles. The fish take in oxygen from the water by means of their gills and discharge CO-, together with urinary products, particularly in the form of ammonia. When water containing CO-, and ammonia is sucked into the air lift pump, the CO-, gas will be taken up by the rising air bubbles. The same thing will happen to some extent with regard to ammonia and other substances. , The most important thing, however, is that the water is ridded of CO-,. This air that flows in at the sur¬ face of the tank is air-enriched so that one constantly obtains a new supply of oxygen-enriched water. The water in the fish farm is thus circulated the entire time and is freed of CO-, and en¬ riched with air. Smaller amounts of new water are being supplied the whole time, essentially in order to hold the ammonia content in the water at an acceptable level. Because there are used only small amounts of fresh water, it would be expedient to maintain a higher temperature in the system, at least in certain periods of the year. In this connection a heat pump can be used, inasmuch as the heat in the discharged water and/or the heat in the surround¬ ing water can be utilized, in the case of a water-based system.
The fish farm in accordance with the invention would in addition be very suitable as a land-based facilit}', which is quite advan¬ tageous from the point of view of several other conditions. Th objections to a land-based system have been that pumping of flow ing water from a nearby water source has been very demanding i terms of energy. With the system according to the invention, th water circulates through the air lift pump without requiring an energy to lift the water, and fresh water is added in only smal amounts, which thus requires little energy. The system is totall controlled with regard to any strain on the outside environment, and also with regard to the influence of the outside environmen on the fish within the facility.
Where a sea-based system is concerned, the small amount of wate that is necessary in order to replenish the water in the tank could be taken from remote places; if, for example, the surface water is polluted or too cold or too warm, the water can be taken from deeper lying layers. Due to the fact that we are talking about small amounts of water, the pumping costs would be rela¬ tively modest.
The system has been the object of particular interest in areas where warm ground water is found. In a fish farm according to the invention, located in an area where there is access to warm ground water, consumer fish of very valuable types that have a high price on the market can be farmed. Here one thinks primar¬ ily of sturgeon, which brings 2 to 3 times as high a price as salmon on an international market. The sturgeon requires a water temperature of about 25 C, and this can very easily be obtained with the aid of warm ground water in Southern European countries where there is rich access to warm ground water at a relatively modest depth below the ground level.
In accordance with a further development of the invention, carp pools may be attached to the system. The pipe from the well that is placed at the bottom leads to the carp pool, and the same per¬ tains to water from the outlet from the tank-. These pipes will carry large quantities of nutrients to the water in the carp pools. The carp in a carp pool are not given feed, but live ex¬ clusively on the vegetation that grows in the carp pool. In order to achieve sufficient growth, large quantities of nutrients must be added. In accordance with the invention these nutrients can be supplied at no cost from the fish farm.
The invention will now be explained more fully in the following, with reference to the drawing that schematically shows an embodi¬ ment form for a fish farm according to the invention. Figure 1 shows the fish farm seen in perspective with some of the wall cut away, and
Figure 2 shows the fish farm seen from directly above.
The fish farm according to the invention consists of a tank 1 with a circular wall 2 and a bottom 3. To the tank 1 is con¬ nected an air lif pump 4 with an intake 5 at the bottom of the tank 1. The outlet 6 from the air lift pump passes through the wall of the tank in the proximity of the surface 7 of the water fill in the tank. The inlet pipe 8 is directed tangentially within the tank so that a whirlpool current is formed in the water in the tank, as shown with arrows 9. The water level in the tank is regulated by an overflow pipe 10. Air to the air lif pump is supplied through an air conduit 11 and water supply for renewal of the water in the tank is brought in through the pipes 12.
In the bottom of the tank is provided a well 13 haying a filter 14. To the well 13 is connected a suction pipe 15.
By means of the air lift pump, continuous circulation of the water in the tank 1 is obtained. At the same time, the water is oxygenated by means of the air bubbles in the air lift pump, and the water is cleaned by virtue of the CO- in the water being taken up in the air bubbles floating up and passing out into the open air. Through the supply pipes the water is renewed over time. The water that is added may be heated to maintain a con¬ stant temperature in the water in the tank. The polluted water that runs out from the tank through the overflow pipe 10 can go either to carp pools or to a purifying plant. The pipe 15 that sucks out solid impurities from the well 13 can go to the build¬ up of fertilizer or to carp pools for their fertilization. Th whirling current collects pollutants', such as feed remains and excrements from the fish, centrally in the tank, and these will descend and be gathered into the well 13.
As will be understood, one would be able to obtain full control with a fish farming facility according to the invention. There is used a sealed tank or bag, so that no contaminants are brought into the surrounding environment. Excrements and feed remains that descend into the well are pumped to a plant that takes care of these substances as fertilizers. The overflow water, which is only very slightly polluted, can be conducted to a conventional purifying plant for waste water. As regards those periods when the fish have been given medication, the tank can be drained completely after the medicating and replenished with fresh water. The water that is contaminated by medicines can be purified in a special facility.

Claims

P a t e n t C l a i m s
1.
A breeding facility (fish farm) for marine animals, particularly fish, comprising a tank (1) with a preferably circular cross- section designed to be filled with water up to a certain level (7), c h a r a c t e r i z e d b y a combination of the following features: a) that it is connected to a circulation pump (4) with an inlet (5) near the bottom of the tank (1) and an outlet (6) near the surface (7) of the water in the tank (1), b) that it is connected to a supply pipe or pipes (12) for fresh water and a discharge pipe (10) to provide a renewal of the water in the tank over time, c) that the inlet (6) from the pump is directed tangentially or approximately at a tangent within the tank to provide a constant, circulating current in the water, d) that in the bottom there is provided a well (13) centrally located in the tank for collection of excrements and feed remains and other impurities, and e) that to the well (13) is connected a suction pipe for the removal of impurities.
2.
A fish farm according to claim 1, c h a r a c t e r i z e d i n that the circulation pump (4) is of the air lift type.
3.
A fish farm according to claim 1, c h a r a c t e r i z e d i n that the discharge pipe (10) from the tank (1) and the suction pipe (15) from the well (13) lead to one or more carp pools or the like which are located near the tank (1).
4.
A fish farm according to claim 1 or 2, where the tank is located on land, c h a r a c t e r i z e d i n that the water supply consists entirely or partially of warm ground water.
PCT/NO1989/000107 1988-10-12 1989-10-09 A breeding facility for marine animals, particularly fish WO1990003729A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO884542 1988-10-12
NO88884542A NO884542L (en) 1988-10-12 1988-10-12 DEVICE FOR FARMING INSTALLATIONS FOR MARINE ANIMALS, SPECIAL FISH.

Publications (1)

Publication Number Publication Date
WO1990003729A1 true WO1990003729A1 (en) 1990-04-19

Family

ID=19891321

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1989/000107 WO1990003729A1 (en) 1988-10-12 1989-10-09 A breeding facility for marine animals, particularly fish

Country Status (4)

Country Link
AU (1) AU4320989A (en)
CA (1) CA2000443A1 (en)
NO (1) NO884542L (en)
WO (1) WO1990003729A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5660141A (en) * 1992-07-20 1997-08-26 Kjersem; Geir Process and arrangement for the supply of water to a pond
WO2004012502A1 (en) * 2002-08-02 2004-02-12 Viking Fish Farms Limited A system for rearing fish
CN100420376C (en) * 2005-08-18 2008-09-24 中国水产科学研究院黄海水产研究所 Automatic control method and system of fishpond water level of industrialized circulation water
GB2462691A (en) * 2008-08-23 2010-02-24 Ivor Edward Holme Fish farming system
CN103704165A (en) * 2013-12-25 2014-04-09 浙江海洋学院 Air-free stone breeding container
NO20170759A1 (en) * 2017-02-14 2018-08-15 Rognsoey Richard A container arrangement for fish farming

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6093320A (en) * 1998-11-30 2000-07-25 Future Sea Technologies Inc Tank cleaning system
CN106508780B (en) * 2016-11-08 2019-04-12 中国水产科学研究院渔业机械仪器研究所 A kind of solar energy water lift water recovery apparatus between adjacent cultivating pool
CN109526841A (en) * 2017-09-20 2019-03-29 贵港市瑞成科技有限公司 A kind of sea-farming feed coefficient
CN108719172B (en) 2018-03-29 2021-03-26 上海海洋大学 Pond culture circulation system based on ecological toilet module
CN108713523B (en) * 2018-03-29 2021-04-20 上海海洋大学 Ecological toilet module for pond culture
CN115088671B (en) * 2022-07-11 2023-11-07 通威股份有限公司 Pond internal circulation culture system

Citations (4)

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Publication number Priority date Publication date Assignee Title
SU789082A1 (en) * 1979-03-26 1980-12-23 Московский Ордена Ленина И Ордена Трудового Красного Знамени Государственный Университет Им.М.В. Ломоносова Installation for fish breeding
FR2601555A1 (en) * 1986-07-15 1988-01-22 Faucoup Roger Installation in particular for filtering and oxygenating water in fish tanks
GB2200822A (en) * 1987-02-11 1988-08-17 Ragnar Vadseth Fish-farming enclosures
NO160753B (en) * 1986-07-01 1989-02-20 Knutsen R W PROCEDURE AND APPARATUS FOR USE IN CLEANING OF WATER IN FISHING CUSTOMERS.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU789082A1 (en) * 1979-03-26 1980-12-23 Московский Ордена Ленина И Ордена Трудового Красного Знамени Государственный Университет Им.М.В. Ломоносова Installation for fish breeding
NO160753B (en) * 1986-07-01 1989-02-20 Knutsen R W PROCEDURE AND APPARATUS FOR USE IN CLEANING OF WATER IN FISHING CUSTOMERS.
FR2601555A1 (en) * 1986-07-15 1988-01-22 Faucoup Roger Installation in particular for filtering and oxygenating water in fish tanks
GB2200822A (en) * 1987-02-11 1988-08-17 Ragnar Vadseth Fish-farming enclosures

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NORSK FISKEOPPDRETT, Vol. 3, 1987, KARE TVINNEREIM: "Stromningsforhold i oppdrettskar for settefisk", see page 42 - page 43. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5660141A (en) * 1992-07-20 1997-08-26 Kjersem; Geir Process and arrangement for the supply of water to a pond
WO2004012502A1 (en) * 2002-08-02 2004-02-12 Viking Fish Farms Limited A system for rearing fish
CN100420376C (en) * 2005-08-18 2008-09-24 中国水产科学研究院黄海水产研究所 Automatic control method and system of fishpond water level of industrialized circulation water
GB2462691A (en) * 2008-08-23 2010-02-24 Ivor Edward Holme Fish farming system
CN103704165A (en) * 2013-12-25 2014-04-09 浙江海洋学院 Air-free stone breeding container
NO20170759A1 (en) * 2017-02-14 2018-08-15 Rognsoey Richard A container arrangement for fish farming
NO343073B1 (en) * 2017-02-14 2018-10-29 Rognsoey Richard A container arrangement for fish farming

Also Published As

Publication number Publication date
NO884542L (en) 1990-04-17
NO884542D0 (en) 1988-10-12
CA2000443A1 (en) 1990-04-12
AU4320989A (en) 1990-05-01

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