AU2020269070B2 - Apparatus and method for collecting loosened fish parasites in a fish pen - Google Patents
Apparatus and method for collecting loosened fish parasites in a fish pen Download PDFInfo
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- AU2020269070B2 AU2020269070B2 AU2020269070A AU2020269070A AU2020269070B2 AU 2020269070 B2 AU2020269070 B2 AU 2020269070B2 AU 2020269070 A AU2020269070 A AU 2020269070A AU 2020269070 A AU2020269070 A AU 2020269070A AU 2020269070 B2 AU2020269070 B2 AU 2020269070B2
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- Prior art keywords
- fish
- net
- sweep net
- parasites
- sweep
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- 241000251468 Actinopterygii Species 0.000 title claims abstract description 172
- 244000045947 parasite Species 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000011282 treatment Methods 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 241000238424 Crustacea Species 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 5
- 239000007779 soft material Substances 0.000 claims description 4
- 238000009372 pisciculture Methods 0.000 abstract description 16
- 235000019688 fish Nutrition 0.000 description 133
- 241001674048 Phthiraptera Species 0.000 description 17
- 241000972773 Aulopiformes Species 0.000 description 16
- 235000019515 salmon Nutrition 0.000 description 16
- 230000005684 electric field Effects 0.000 description 6
- 241001247234 Lepeophtheirus salmonis Species 0.000 description 4
- 235000013601 eggs Nutrition 0.000 description 4
- 208000015181 infectious disease Diseases 0.000 description 3
- 230000002458 infectious effect Effects 0.000 description 3
- 231100000518 lethal Toxicity 0.000 description 3
- 230000001665 lethal effect Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 210000002816 gill Anatomy 0.000 description 2
- 210000004948 gill arche Anatomy 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 210000003097 mucus Anatomy 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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
- 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
-
- 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
- A01K61/10—Culture of aquatic animals of fish
- A01K61/13—Prevention or treatment of fish diseases
-
- 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
- A01K74/00—Other catching nets or the like
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M11/00—Counting of objects distributed at random, e.g. on a surface
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Marine Sciences & Fisheries (AREA)
- Physics & Mathematics (AREA)
- Zoology (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Farming Of Fish And Shellfish (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
A sweep net (1) for crowding fish in a fish-farming pen, the sweep net (1) comprising a fine-mesh net (10). The invention also relates to a collecting device for free fish parasites in a fish pen, a system (2) for collecting free fish parasites in a fish pen, and a method for calculating the effect of a treatment against an external fish parasite in which the fish is treated outside a fish pen.
Description
APPARATUS AND METHOD FOR COLLECTING LOOSENED FISH PARASITES IN A FISH PEN
The invention relates to a sweep net which is used for crowding fish in a fish-farming pen. More specifically, the invention relates to a fine-mesh sweep net that is provided with a net or netting that is so finely meshed that external fish parasites, which fall off the fish when the fish are being crowded with the sweep net, cannot move through the sweep net. The invention further relates to a system comprising the sweep net according to the invention, and a collecting apparatus for removing fish parasites that fall off the fish during crowding in the sweep net. The collecting apparatus comprises a collecting device that is positioned on the crowding side of the sweep net, and a han dling unit for fish parasites that have fallen off in the sweep net. The fish parasite may be a crustacean parasite; in particular, the fish parasite may be salmon lice ( Lepeo - phtheirus salmonis ). The invention also comprises a sweep net which is so finely meshed that fish that are being crowded in the sweep net will not get injured by jaws, gill covers or gill arches and fins catching in the meshes of the sweep net. The inven tion also relates to a sweep net which is produced from a soft material which is gentle on the fish on contact between the fish and the sweep net.
Fish-farming in closed enclosures involves a large number of fish being held together in a small area. This gives good conditions for parasites. In the farming of salmonoids, external crustacean parasites have become a problem. Especially salmon lice (/.. salm onis) are present in large numbers. It is necessary to treat fish that are infected with salmon lice in order to keep the number of parasites down and to ensure the welfare of the fish.
Several of the bath treatments are carried out by the fish being guided into a pipe system or into tanks. This has the advantage of there being better control of the treatment time in relation to bath treatment of the fish in a fish pen. It also has the advantage of the amount of treatment solution being reduced. For some of the forms
P29072PC00 description and claims prepared for publication of patent
of treatment, such as the use of warm water, using pipes or tanks is a precondition for the method to work. Some of the forms of treatment may be combined with flushing the fish to wash off salmon lice.
Before the fish can be guided into a pipe system, the fish must be crowded together in the fish pen so that the fish may be pumped into the pipe system with a fish pump. It has turned out that salmon lice, especially the pre-adult and full-grown (adult) salmon lice, may loosen from the fish skin when the fish are being crowded together. Salmon lice that fall off may be alive, and these are capable of reinfecting fish. The salmon- louse females may drop their egg strings. The eggs may hatch and give new infectious salmon-louse larvae. Pre-adult salmon lice grow to be 3-5 mm long. Adult male lice will be 5-6 mm long and adult female lice will be 8-12 mm long.
It is therefore an advantage if salmon lice and egg strings that fall off the fish during crowding can be collected.
Crowding fish in a fish-farming pen is done by using a so-called casting net. A casting net like that is also referred to as a sweep net or sweep seine. In what follows, the term sweep net will be used. A sweep net comprises a net, also called netting. The net may be rectangular, or mainly rectangular with one or more truncated corners. The sweep net comprises a top line which may be provided with floats or other buoyant bodies. The sweep net further comprises a bottom line. The bottom line may be pro- vided with weights, such as a lead line. The sweep net may be provided with lifting lugs at the corners. There are no requirements for the mesh size of the net beyond making it impossible for the fish in the fish-farming pen to swim through the sweep net. Typically, the mesh size of the sweep net will be the same size as the mesh size of the fish-farming pen. A sweep net may be of various sizes, and the size may be adapted to the size of the fish-farming pen in which the fish are to be crowded together. A sweep net may be from 10 to 100 metres wide and from 5 to 50 metres deep. Typically, a sweep net may be 65 m long and 30 m deep.
The sweep net is put into the fish-farming pen on the opposite side to where it has been planned for the fish pump to suck fish out of the fish-farming pen. The sweep net is lowered into the fish-farming pen in such a way that the top line with buoyancy means is floating in the water surface inside the fish-farming pen. The lower part of the sweep net is weighted down by weights or a lead line, and therefore the sweep net first stands as a vertical wall inside the fish-farming pen. Traces are attached to the
P29072PC00 description and claims prepared for publication of patent
lifting lugs and, by the traces being pulled, the sweep net is moved towards the inlet of the fish pump. The traces that are attached to the bottom lifting lugs are pulled in faster than the traces attached to the upper lifting lugs. The sweep net will slowly be puckered up into a bag. To begin with, the fish in the fish pen will be able to swim past the sweep net, but fish that are within the sweep net as it becomes completely puckered-up, will be trapped. The fish are crowded together by the net being pulled further up, and the fish then have a density which is suitable for them to be sucked into the fish pump. The sweep net is pulled further up until all the fish in the sweep net have been sucked into the pump. It is common to repeat this four to five times in a fish-farming pen in order to empty the fish pen completely of fish.
It is known that some fish become injured by a relatively coarse-mesh sweep net. The jaws may catch in the net meshes when the fish are tight together. It is also known that gill covers and gill arches may catch in the net meshes. It is also known that fins, especially pectoral fins may catch in the net meshes so that the fins are torn off.
It is also known that many salmon lice fall off the fish skin when the fish are crowded in a sweep net. As much as 40 % to 60 % of the mobile stages of salmon lice may fall off. The mobile stages comprise pre-adult and adult salmon lice. As mentioned above, these loosened salmon lice may re-infect fish. It is also more difficult to measure how effective a treatment of the fish is, when it is actually not known how many external fish parasites are stuck to the fish before treatment. Without being bound by theory, it is possible that fish that get stuck in the net meshes and thereby get a panic-like be haviour, trigger a stress reaction in the other fish, which can be seen from their swimming behaviour. It is further possible that the stress reaction releases stress- related compounds in the mucus layer of the fish. Salmon lice may possibly register the changed composition of the mucus layer and then leave the host fish.
Crowding fish with a sweep net is also done when the fish are to be transferred from a fish pen to a well boat for the fish to be transported to a salmon slaughterhouse. Crowding fish with a sweep net is also done in other connections when a fish pen is to be emptied of fish.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
The object is achieved through the features that are specified in the description below and in the claims that follow.
P29072PC00 description and claims prepared for publication of patent
The invention is defined by the independent claims. The dependent claims define ad vantageous embodiments of the invention.
In a first aspect, the invention relates, more specifically, to a sweep net for crowding fish in a fish pen, and the sweep net comprises a fine-mesh net. By a fine-mesh net is meant, here, that the mesh size is adapted for pre-adult and adult fish parasites, es pecially salmon lice (/.. salmonis), not to be able to pass through the meshes of the net. Egg strings may also be retained by the fine-mesh net.
The mesh size of the sweep net may be between 1.1 mm and 10 mm. The mesh size of the sweep net may be between 1.1 and 7.5 mm. Alternatively, the mesh size may be between 1.1 mm and 5 mm. Alternatively, the mesh size may be between 2.0 mm and 10 mm. Alternatively, the mesh size may be between 2.0 mm and 7.5 mm. Alter natively, the mesh size may be between 2.0 mm and 5 mm. Alternatively, the mesh size may be larger than 1.1 mm, or larger than 1.5 mm, or larger than 2.0 mm. Alter natively, the mesh size may be smaller than 10 mm, or smaller than 7.5 mm, or smaller than 5 mm or smaller than 4 mm, or smaller than 3 mm. The mesh size may be within an interval as stated by combining any of the preceding given largest and smallest mesh sizes.
The invention also relates to a collecting device for free fish parasites in a mass of wa ter in a fish pen, the collecting device comprising a sweep net as described hereinbe- fore.
The invention also relates to a system for collecting free parasites in a mass of water, wherein the system comprises the sweep net as described hereinbefore, and the sweep net may form an outer side and an opposite crowding side, and the system may be provided with a collecting apparatus for an external fish parasite. This has the advantage of loosened fish parasites being actively removed from the water within the fish-farming pen by the system. In particular, fish parasites that do not attach to the sweep net will be removed by the system.
The collecting apparatus may comprise a collecting device for an external fish parasite on the crowding side of the sweep net. The collecting device may comprise a perforat- ed pipe. The perforated pipe may be in fluid communication with the suction side of a pump. The pump may be placed on a vessel. In an alternative embodiment, the pump may be submerged. In an alternative embodiment, the pump may be submerged and positioned on the free end portion of the pipe, so that the perforated pipe is positioned on the pressure side of the pump.
P29072PC00 description and claims prepared for publication of patent
The system may comprise a handling unit for a fish parasite on the pressure side of the pump. The perforated pipe may be in fluid communication with the handling unit. The handling unit may comprise a filtering unit which separates fish parasites from the water flowing through the filter unit. The handling unit may comprise a channel pro vided with electrodes. Fish parasites in the water flowing through the channel may be subjected to a lethal electric field or at least an electric field that causing lasting harm to the fish parasite so that it is no longer infectious.
In an alternative embodiment, the system for collecting free fish parasites in a mass of water may comprise a sweep net as described hereinbefore, and the system may comprise:
- a fish pump arranged to carry fish, water and free fish parasites in the water from the sweep net;
- a treatment unit for fish infected with a fish parasite; and
- a collecting unit arranged to retain the free fish parasites in the water and fish para sites that have loosened from the fish in the treatment unit.
In a second aspect, the invention relates to a method for calculating the effect of a treatment against an external fish parasite, in which the fish is treated outside a fish pen, the method comprising the steps of:
a) catching a representative number of fish from the fish pen;
b) counting the number of external fish parasites and calculating an average number of fish parasites per fish;
repeatedly:
c) crowding the fish together in the fish pen with a sweep net;
d) guiding the crowded fish through an appropriate treatment unit; and
e) guiding the treated fish into a suitable receiving tank;
and
f) picking a representative number of fish after the treatment unit, counting the number of remaining external fish parasites and calculating an average number of remaining fish parasites per fish,
and the method, in step c), comprising the use of a sweep net comprising a fine-mesh net.
The method may comprise using a sweep net which comprises a soft material. The method may comprise using a sweep net with a mesh size of between 1.1 mm and 10 mm. The mesh size of the sweep net may be between 1.1 and 7.5 mm. Alternatively, the mesh size may be between 1.1 mm and 5 mm. Alternatively, the mesh size may
P29072PC00 description and claims prepared for publication of patent
be between 2.0 mm and 10 mm. Alternatively, the mesh size may be between 2.0 mm and 7.5 mm. Alternatively, the mesh size may be between 2.0 mm and 5 mm. Alter natively, the mesh size may be larger than 1.1 mm or larger than 1.5 mm, or larger than 2.0 mm. Alternatively, the mesh size may be smaller than 10 mm, or smaller than 7.5 mm, or smaller than 5 mm or smaller than 4 mm, or smaller than 3 mm. The mesh size may be within an interval as stated by combining any of the preceding giv en largest and smallest mesh sizes.
In what follows, an example of a preferred embodiment is described, which is visual ized in the accompanying drawings, in which: Figures 1A-B show schematically a sweep net in two prior-art embodiments; and
Figure 2 shows schematically a system for collecting a fish parasite in accordance with the invention.
In the figures, the reference numeral 100 indicates a prior-art sweep net. The sweep net 100 comprises a net 110. At an edge, the sweep net 100 comprises a top line 120 which is provided with a plurality of buoyant bodies 122. On the opposite side from that of the top line 120, the sweep net 100 comprises a bottom line 130. The bottom line 130 may be provided with weights (not shown), or the bottom line 130 may com prise a lead line (not shown). The sweep net 100 is provided with a lifting lug 140 at each corner. Traces (not shown) are attached to the lifting lugs 140. The sweep net 100 may be of a rectangular shape, as shown in figure 1A. The sweep net 100 may be formed with truncated corners, as shown in figure IB.
According to the invention, the sweep net 1 is formed in the same way as known sweep nets 100, the difference being that the net 110 is replaced with a fine-mesh net 10. The mesh size of the fine-mesh net 10 is chosen to be such that external fish par- asites, such as pre-adult and adult crustacean parasites (not shown), cannot move through the fine-mesh net 10. The crustacean parasite may be a salmon louse (/.. salmonis). The mesh size may be smaller than 10 mm, such as smaller than 7.5 mm, such as smaller than 5 mm, such as smaller than 4 mm, such as smaller than 3 mm. The mesh size may be larger than 1.1 mm, such as larger than 1.5 mm, such as larg- er than 2 mm.
The sweep net 1 comprises the net 10. At an edge, the sweep net 1 comprises a top line 12 which is provided with a plurality of buoyant bodies (not shown in figure 2). On the opposite side from that of the top line 12, the sweep net 1 comprises a bottom line
P29072PC00 description and claims prepared for publication of patent
13. The bottom line 13 may be provided with weights (not shown), or the bottom line 13 may comprise a lead line (not shown). The sweep net 1 is provided with a lifting lug 14 at each corner. Traces (not shown) are attached to the lifting lugs 14. The net 10 forms an outer side 11 and a crowding side 19. The crowding side 19 faces the fish during crowding. The outer side 11 is the opposite side of the net 10 relative to the crowding side 19.
The invention also relates to a system 2. The system 2 comprises the sweep net 1 and a collecting apparatus 3 for collecting fish parasites which have fallen off fish (not shown) during crowding in a fish-farming pen (not shown).
The collecting apparatus 3 comprises a collecting device 4 which is positioned on the crowding side 19 of the sweep net 1. In one embodiment, the collecting device 4 is formed of a perforated pipe 42. The perforated pipe 42 may be closed in a free end portion 40. At an opposite end portion 49, the perforated pipe 42 may be connected to a hose 44. The system 2 comprises a pump 5 in fluid communication with the hose 44 on the suction side of the pump 5.
The system 2 comprises a handling unit 6 for fish parasites. The handling unit 6 is in fluid communication with the pump 5 on the pressure side of the pump 5. A channel 64 carries water containing fish parasites from the pump to the handling unit 6. In one embodiment, the handling unit 6 may comprise a filter unit 62. The fish parasites are retained by the filter unit 62 while water passes through the filter unit 62. In another embodiment, the handling unit 62 comprises a chamber 66 provided with electrodes (not shown). The electrodes are supplied with electrical energy from a source (not shown). An electric field is formed between the electrodes inside the chamber 66. Fish parasites flowing through the chamber 66 are subjected to the electric field. The elec tric field has a strength and a character that at least inflict lasting damage on the fish parasites so that they are no longer infectious. The electric field may be lethal to the fish parasites. The water that flows through the chamber 66 then flows to a drain 7.
The handling unit 6 may comprise the water flowing first through the filter unit 62 and then through the chamber 64 before the water flows to the drain 7. The handling unit 6 may comprise the water flowing first through the chamber 64 and then through the filter unit 62 before the water flows to the drain 7.
The pump 5 and the handling unit 6 may be positioned on a vessel (not shown).
In an alternative embodiment (not shown), the pump 5 may be submerged and posi tioned between the collecting device 4 and the handling unit 6. In another embodi-
P29072PC00 description and claims prepared for publication of patent
merit (not shown), the pump 5 may be submerged and positioned at the free end por tion 40 of the collecting device 4. In this embodiment, the collecting device 4 will be positioned on the pressure side of the pump 5.
In an alternative embodiment (not shown), loosened fish parasites may be sucked up in the water together with the fish that are crowded together in the sweep net 1. Wa ter, fish and fish parasites are carried through a fish pump (not shown) into a suitable treatment unit (not shown) for fish with external fish parasites such as crustacean parasites to be treated. Free fish parasites will be separated from the sucked-up water together with fish parasites that are separated from the fish inside the treatment unit and be collected in a suitable collecting unit, such as a filter (not shown).
A fish pump like that creates such a strong current through the fine-mesh sweep net that free fish parasites will not manage to swim against the current, and the fish para sites will be carried into the fish pump and then into the treatment unit. Since the sweep net 1 is puckered up as it is being emptied of fish, most of the loosened para sites will be sucked up. The sweep net according to the invention is therefore also a collecting device for free fish parasites, such as pre-adult and adult crustacean para sites, in a mass of water.
The sweep net 1 is used for crowding fish in a fish-farming pen in a known manner. After each crowding or after the fish pen has been emptied of all the fish, the sweep net 1 may be hoisted and immersed in a vessel (not shown) containing a solution which is lastingly harmful to fish parasites. The solution may be lethal to fish para sites.
It should be noted that all the above-mentioned embodiments illustrate the invention, but do not limit it, and persons skilled in the art may construct many alternative em bodiments without departing from the scope of the attached claims. In the claims, reference numbers in brackets are not to be regarded as restrictive.
The use of the verb "to comprise" and its different forms does not exclude the pres ence of elements or steps that are not mentioned in the claims. The indefinite article "a" or "an" before an element does not exclude the presence of several such elements.
The fact that some features are indicated in mutually different dependent claims does not indicate that a combination of these features cannot be used with advantage.
P29072PC00 description and claims prepared for publication of patent
Claims (13)
1. A sweep net (1) for crowding fish in a fish pen, c h a r a c t e r i
z e d i n that the sweep net (1) comprises a fine-mesh net (10).
2. The sweep net (1) according to claim 1, wherein the sweep net (1) compris es a soft material.
3. The sweep net (1) according to claim 1 or 2, wherein the mesh size of the sweep net (1) is between 1.1 mm and 10 mm.
4. The sweep net (1) according to claim 3, wherein the mesh size of the sweep net (1) is between 1.1 mm and 5 mm.
5. A collecting device for free fish parasites in a mass of water in a fish pen, wherein the collecting device comprises a sweep net (1) according to any one of claims 1-4.
6. A system (2) for collecting free fish parasites in a mass of water, wherein the system comprises a sweep net (1) in accordance with any one of claims 1-4, the sweep net (1) forming an outer side (11) and an opposite crowding side (19), and the system (2) comprising a collecting apparatus (3) for an external fish parasite.
7. The system (2) according to claim 6, wherein the collecting apparatus (3) comprises a collecting device (4) for an external fish parasite positioned on the crowding side (19) of the sweep net (1).
8. The system (2) according to claim 7, wherein the collecting device (4) com prises a perforated pipe (42).
9. The system (2) according to claim 8, wherein the perforated pipe (42) is in fluid communication with the suction side of a pump (5).
10. The system (2) according to claim 8, wherein the system (2) comprises a handling unit (6) for a crustacean parasite, the handling unit (6) being in flu id communication with a pump (5) on the pressure side of the pump (5).
11. The system (2) for collecting free fish parasites in a mass of water, wherein the system comprises a sweep net (1) according to any one of claims 1 to 4, and the system (2) comprises:
P29072PC00 description and claims prepared for publication of patent
- a fish pump arranged to carry fish, water and free fish parasites in the wa ter from the sweep net (1);
- a treatment unit for fish infected with a fish parasite; and
- a collecting unit arranged to retain the free fish parasites in the water and fish parasites that have loosened from the fish in the treatment unit.
12. A method for calculating the effect of a treatment against an external fish parasite in which the fish is treated outside a fish pen, the method compris ing the steps of:
a) catching a representative number of fish from the fish pen;
b) counting the number of external fish parasites and calculating an average number of fish parasites per fish;
repeatedly:
c) crowding the fish together in the fish pen with a sweep net;
d) guiding the crowded fish through a suitable treatment unit; and e) guiding the treated fish into a suitable receiving tank;
and
f) picking a representative number of fish after the treatment unit, counting the number of remaining external fish parasites and calculating an average number of remaining fish parasites per fish,
c h a r a c t e r i z e d i n that
in step c, the method comprises using a sweep net (1) comprising a fine- mesh net (10).
13. The method according to claim 12, wherein the sweep net (1) comprises a soft material.
P29072PC00 description and claims prepared for publication of patent
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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NO20190594 | 2019-05-09 | ||
NO20190594 | 2019-05-09 | ||
NO20200358 | 2020-03-26 | ||
NO20200358A NO346241B1 (en) | 2019-05-09 | 2020-03-26 | Fine-mesh orchestra note |
PCT/NO2020/050116 WO2020226508A1 (en) | 2019-05-09 | 2020-05-07 | Apparatus and method for collecting loosened fish parasites in a fish pen |
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AU2020269070A1 AU2020269070A1 (en) | 2021-11-25 |
AU2020269070B2 true AU2020269070B2 (en) | 2024-01-11 |
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AU2020269070A Active AU2020269070B2 (en) | 2019-05-09 | 2020-05-07 | Apparatus and method for collecting loosened fish parasites in a fish pen |
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AU (1) | AU2020269070B2 (en) |
CA (1) | CA3139644A1 (en) |
NO (1) | NO346241B1 (en) |
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SU1138088A1 (en) * | 1982-10-12 | 1985-02-07 | Центральное Проектно-Конструкторское И Технологическое Бюро Всесоюзного Рыбопромышленного Объединения Азово-Черноморского Бассейна | Trawl for catching fish |
NO20160441A1 (en) * | 2016-03-15 | 2017-09-18 | Oxyvision As | System and method of processing fish |
WO2018104487A1 (en) * | 2016-12-08 | 2018-06-14 | Fish Vet Group Norge As | Treatment for removing ectoparasites from fish |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO20120133A1 (en) * | 2012-02-09 | 2013-06-24 | Calanus As | Fluid permeable protective net for farmed cages |
AU2016208587B2 (en) * | 2015-01-22 | 2020-05-21 | Philips Lighting Holding B.V. | Light unit for counting sea lice |
NO343600B1 (en) * | 2017-07-24 | 2019-04-08 | Selstad As | FARMING FARMING |
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2020
- 2020-03-26 NO NO20200358A patent/NO346241B1/en unknown
- 2020-05-07 CA CA3139644A patent/CA3139644A1/en active Pending
- 2020-05-07 AU AU2020269070A patent/AU2020269070B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1138088A1 (en) * | 1982-10-12 | 1985-02-07 | Центральное Проектно-Конструкторское И Технологическое Бюро Всесоюзного Рыбопромышленного Объединения Азово-Черноморского Бассейна | Trawl for catching fish |
NO20160441A1 (en) * | 2016-03-15 | 2017-09-18 | Oxyvision As | System and method of processing fish |
WO2018104487A1 (en) * | 2016-12-08 | 2018-06-14 | Fish Vet Group Norge As | Treatment for removing ectoparasites from fish |
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AU2020269070A1 (en) | 2021-11-25 |
CA3139644A1 (en) | 2020-11-12 |
NO346241B1 (en) | 2022-05-02 |
NO20200358A1 (en) | 2020-11-10 |
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