WO2003092369A1 - Sliding bulkhead for sorting of live fish - Google Patents

Sliding bulkhead for sorting of live fish Download PDF

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Publication number
WO2003092369A1
WO2003092369A1 PCT/NO2003/000140 NO0300140W WO03092369A1 WO 2003092369 A1 WO2003092369 A1 WO 2003092369A1 NO 0300140 W NO0300140 W NO 0300140W WO 03092369 A1 WO03092369 A1 WO 03092369A1
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WO
WIPO (PCT)
Prior art keywords
population
outlet
grating
inlet
bulkhead
Prior art date
Application number
PCT/NO2003/000140
Other languages
French (fr)
Inventor
Nils H. BJØRSHOL
Original Assignee
Sintef Fiskeri Og Havbruk 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 Sintef Fiskeri Og Havbruk As filed Critical Sintef Fiskeri Og Havbruk As
Priority to CA002483681A priority Critical patent/CA2483681C/en
Priority to AU2003228154A priority patent/AU2003228154A1/en
Priority to EP03725895A priority patent/EP1499179B1/en
Priority to DE60318194T priority patent/DE60318194D1/en
Publication of WO2003092369A1 publication Critical patent/WO2003092369A1/en
Priority to DK200401818A priority patent/DK176601B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/14—Fishing vessels
    • B63B35/24—Fish holds
    • B63B35/26—Fish holds for live fish
    • 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
    • A01K61/90—Sorting, grading, counting or marking live aquatic animals, e.g. sex determination

Definitions

  • This invention relates to an apparatus and method for transport and unloading of several populations of size classes of live fish in a fish carrier.
  • the invention also relates to sorting of live fish in a gentle manner.
  • Displacing live fish in a tank by means of a sliding bulkhead is known, among other things shown in a folder concerning unidirectional flow girder from Skretting.
  • the fish is displaced towards one end of a rectangular tank by means of a sliding bulkhead.
  • the fish arrives at the desired end and is removed from the tank in a crate or a grab, both lifted by means of a crane.
  • An alternative in a fish carrier is to lower the water level and then pump out the fish by means of a vacuum pump.
  • the fish is stressed when the water level is lowered, and it also becomes stressed by being vacuum pumped, and this should be undesirable due to animal care and fish quality considerations. Stiffness of death in the fish is caused more quickly when it has been stressed immediately before the slaughter. Salmon badly endures vacuum pumping and easily receives internal bleedings when the pressure abruptly decreases below a pressure of one atmosphere during pumping.
  • lowering the water level within the vessel involves a negative influence on the stability of the vessel.
  • an object of the invention with the present invention is to sort the populations in fish carrier with a sliding bulkhead, in a gentle manner.
  • Another problem is receiving, transporting and unloading several populations p1 , p2 of fish, e.g. received from two different suppliers and owned by two different recipients.
  • a further object of the present invention is to keep these populations separated during transport in one and the same tank, and unloading them separately in a gentle manner.
  • Norwegian patent application NO 2001.2898 belonging to Sintef Fiskeri og havbruk AS describes a fish carrier having a transport tank in a doubly curved hull, wherein a sliding bulkhead follows the doubly curved profile of the hull during movement of the sliding bulkhead forwards and backwards along the tank, so that the fish is forced out of the hull in the desired direction without stressing the fish in any degree worth mentioning.
  • NO 2001.2898 does not suggest any manner of transporting or sorting several populations p1 , p2 of different size classes of fish or fish to be kept separately for other reasons, e.g. due to different species or different ownership.
  • This invention represents a solution to several of the problems mentioned above, and is a method for unloading of two different separated populations called p1 and p2 of fish in a fish carrier, wherein said populations are located on either side of a sliding bulkhead with a separation grating in a transport tank, said grating apertures in said separation grating being restricted to a grating aperture which is less than the individuals in both populations p1 and p2, and said tank being provided with at least one fore inlet for fresh water, and at least one aft outlet for water and fish, in which the method further comprises the following steps: i) Said sliding bulkhead with said separation grating displace one of the populations p2 towards said outlet, so that said population p2 is forced out through said outlet.
  • Novel features of the invention are the following: ii) Opening said separation grating and running said sliding bulkhead towards said inlet to a position closer to said inlet than a desired part of the popu- lation pl . iii) Restricting said grating apertures in said separation grating to a grating aperture size which is less than the individuals in said population p1 and running said sliding bulkhead astern, so that said sliding bulkhead with said separation grating displace said second population p1 towards said outlet so that said population p1 is forced through said outlet.
  • Figure 1a is a rather simplified schematic top view of a transport tank at the starboard side of a centre bulkhead in a fish carrier.
  • a sliding bulkhead runs in the longitudinal direction of the tank and the vessel.
  • the transport tank contains two separate populations p1 and p2 to be unloaded separately.
  • Figure 1b is the same schematic top view in which said sliding bulkhead is displaced astern and forces population p2 out through an outlet in the stern end of said vessel. A large amount of water is supplied from ahead, so that the fish in p2 generally will exit with its tail first and is accelerated out through said outlet when arriving at this, and be pumped to a desired location for intermediate storage, further growth or slaughtering.
  • Figure 1 c shows the same schematic top view of said tank in which said sliding bulkhead now is displaced ahead towards the bow, and in which a separation grating or a hatch is completely open so as to have the fish running through to the larger tank volume astern of said sliding bulkhead without obstruction.
  • Figure 1d illustrates that said sliding bulkhead is again moved astern with said separation grating closed for said population p1 and displaces popu- lation p1 through said outlet for water and fish, this time to another location than for population p2.
  • Figure 2a illustrates two separate populations p1 and p2 on each side of a sliding bulkhead in a fish carrier in which said tank has a wall which is constituted by a curved inner skin in said hull, and a second wall which is constituted by a centre bulkhead.
  • Figure 2b is the same schematic top view as figure 2a, in which a sliding bulkhead is displaced astern and forces population p2 through an outlet at the stern of said vessel.
  • the figure further illustrates the same situation as in figure 1 b.
  • Figure 2c shows the same schematic top view of said tank in which said sliding bulkhead now is displaced ahead towards the bow, and in which a separation grating is completely open or the transversal sliding bulkhead has been completely withdrawn along said sliding bulkhead, so as to have the fish running through to the larger tank volume astern of said sliding bulkhead without obstruction.
  • Figure 2d illustrates that said sliding bulkhead is moved astern again with said separation grating or transversal sliding bulkhead closed for population p1 and displaces population p1 through said outlet for water and fish, this time also preferably to another location than for population p2.
  • Figure 3a is similar to figure 1 a a rather simplified schematic view of a transport tank at the starboard side of a centre bulkhead in a fish carrier. A sliding bulkhead runs in the longitudinal direction of said tank and said vessel. The difference from figures 1 and 2 is that said transport tank includes two mixed populations p1 and p2 to be unloaded separately. Said sliding bulkhead has been run to a fore end of said tank.
  • Figure 3b illustrates that oxygen rich fresh water is supplied by pumping through an inlet 46.
  • Said sliding bulkhead is displaced astern from the position ahead and population p1 will tend to move against the water flow through said separation grating to a more oxygen rich water in said fore part of said tank, while the more large-size population p2 will be displaced towards said outlet astern of said tank, and will exit with the tail first due to the water flow and lack of space in the displaced part of said tank.
  • the fish is now sorted at the same time as said population p2 is removed from the tank.
  • Figure 3c illustrates a preferred mode of encouraging the population p1 back to the aft part of the tank by means of turning the water flow in the tank at the same time as the sliding bulkhead is run ahead towards the bow in an open position, e.g.
  • Figure 3d illustrates the final part of this method according to the invention in which the population p1 is displaced astern by said sliding bulkhead with said separation grating closed for population p1 , and in which population p1 is forced out through said outlet at the stern end of said tank.
  • Figure 4a is like figure 3a a rather simplified schematic top view of a transport tank at the starboard side of a centre bulkhead in a fish carrier. As explained above, a sliding bulkhead runs in the longitudinal direction of said tank and said vessel. The difference from figure 3 is that the transport tank contains three mixed populations p1 (smallest individual size), p2 (medium size) and p3 (largest individual size) to be unloaded separately. Said sliding bulkhead is displaced to a fore end of said tank.
  • Figure 4b illustrates that oxygen rich fresh water is pumped through an inlet 46.
  • Said sliding bulkhead is displaced astern from the fore position and the populations p1 and p2 tend to move against the water flow through said separation grating to more oxygen rich water in the fore part of said tank, while the large-size population p3 will be displaced astern towards the outlet at the aft of the tank, and will exit with the tail first due to the water flow and lack of space in the displaced part of said tank.
  • the fish is now sorted in (p1+p2) and (p3) at the same time as the population p3 is removed from the tank.
  • Figure 4c illustrates a preferred mode of plausible populations (p1+p2) back to the aft part of the tank by means of turning the water flow in the tank at the same time as the sliding bulkhead is displaced ahead towards the bow in its open position, e.g., with a completely open or removed separation grating.
  • Figure 4d illustrates a next part of this method according to the invention in which the population p2 is displaced astern by means of the bulkhead with the separation grating open for population p1 , and in which population p2 is forced out through the outlet at the stern end of said tank.
  • Figure 1a is a rather simplified schematic top view of a transport tank 0 at the starboard side of a centre bulkhead 1 in a fish carrier.
  • a sliding bulkhead 6 is arranged, which may run in the longitudinal direction of said tank 0 and said vessel.
  • said transport tank contains two separate populations p1 and p2 to be unloaded separately.
  • the invention is a method for unloading two different populations p1 and p2 of fish from a fish carrier with a sliding bulkhead 6 with a separation grating 60 in a transport tank 0 with at least one fore inlet 46 for fresh water and at least one aft outlet 42 for water and fish, and in which the grating apertures in said separation grating 60 are restricted to be smaller than the individuals in both populations (p1,p2), in which the method comprises the following steps: i) Said sliding bulkhead (6) with said separation grating (60) are displaced astern and displace one of said populations (p2) towards said outlet (42) so that said population (p2) is forced out through said outlet (42).
  • Said separation grating (60) is opened and said sliding bulkhead (6) is displaced towards said inlet (46) to a position closer to said inlet than a desired part of population (p1).
  • said sliding bulkhead is displaced so as to pass the complete population (p1).
  • Said separation grating is restricted to a grating aperture which is less than the fish size in population (p1) of smaller individuals and said sliding bulkhead is displaced astern, so that said sliding bulkhead (6) with said separation grating (60) displace said second population (p1) towards said outlet (42) so that said population (p1) is forced out through said outlet
  • it comprises pumping of fresh water through said inlet (46) so that water flows through said tank and exits through said outlet (42), at the same time as point i) in which said sliding bulkhead (6) with said separation grating (60) displace one of said populations (p2) towards said outlet (42) so that said population (p2) is forced out through said outlet (42).
  • it further comprises pumping of fresh water in through inlet (46) so that water flows through said tank and out through outlet (42), at the same time as point (iii) above with closing of said separation grating (60) and displacement of said sliding bulkhead (6) astern. Said sliding bulkhead (6) with said separation grating (60) will then displace said second population (p1) towards said outlet (42) so that said population (p1) is forced out through said outlet (42), and said tank is at this time emptied of these two populations.
  • a method may be used for sorting at least two mixed populations (p1 , p2) of fish into at least two different size classes called a population (p1) of smaller-size fish and a population (p2) of larger-size fish, in a fish carrier with a sliding bulkhead (6) with a separation grating (60) in a transport tank (0) with at least on fore inlet (46) for fresh water and at least one aft outlet (42) for water and fish.
  • the method comprises the following steps: i) Said separation grating (60) is opened and said sliding bulkhead (6) is displaced towards said inlet (46) to a position closer to said inlet
  • Said separation grating (60) is restricted to a grating aperture less than the size of population (p2) and said sliding bulkhead (6) is displaced astern, so that said sliding bulkhead (6) with said separation grating (60) displaces said larger population (p2) towards said outlet
  • Population (p2) may then in the preferred embodiment be forced out through outlet (42) and be pumped to a desired intermediate storage, further growth, or slaughtering, iii) Said separation grating (60) is opened and said sliding bulkhead (6) is displaced towards said inlet (46) to a position closer to said inlet (46) than a desired part, preferably all, of said population (p1) of smaller individuals, iv) Said grating apertures in said separation grating (60) are restricted, and said sliding bulkhead (6) with said separation grating (60) are displaced astern so that population (p1) of smaller individuals is displaced towards said outlet (42) and may be forced out through oultiet (42).
  • intake of fresh water through the fore inlet (46) and outlet of water through outlet 42 could be included in an advantageous preferred embodiment of the invention, simultaneously with step (ii) with restricting said separation grating (60) to grating aperture less than said populations (p2) size and displacement of said sliding bulkehead (6) astern, so that said sliding bulkhead (6) with said separation grating (60) displace said larger poulation (p2) towards said outlet (42) so that said population (p2) may be forced out through outlet (42).
  • the method comprises intake of fresh water through an aft inlet (48) so that the water flow in said tank flows from astern and ahead in said tank (0) with outlet of water through a fore outlet (47) during step (iii) with opening of said separation grating (60) and running of said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than the desired part, preferably all, of said population (p1) of smaller individuals.
  • transversal sliding bulkhead 7 for forming a simple aperture as "separation grating" between a fore and aft part of said tank 0.
  • this could function as a possible solution for unloading two separate populations (p1 ,p2) of fish, please see Figure 2a which illustrates two separate populations (p1 and p2) being on either side of a sliding bulkhead in a fish carrier, in which said tank has a wall which is constituted by a curved inner skin in the hull, and a second wall which is constituted by a centre bulkhead.
  • Figure 2b is the same schematic top view as Figure 2a, in which said sliding bulkhead is displaced astern and forces population (p2) out through an outlet in said aft end of said vessel.
  • Figure 2c shows the same schematic top view of said tank, in which said sliding bulkhead (6) now is displaced ahead towards the bow, and in which a separation grating is completely open and/or said transversal sliding bulkhead has been completely withdrawn along said sliding bulkhead, in order to have the fish flow through to the larger tank volume astern of said sliding bulkhead without obstruction.
  • Figure 2d illustrates that said sliding bulkhead is displaced astern again with said separation grating and/or said transversal sliding bulkhead closed for population p1 , and forces population p1 out through said outlet for water and fish, this time also preferably to another location than for population p2.
  • Figures 2a-2d illustrates a sliding bulkhead with both an adjustable separation grating and a transversal sliding bulkhead. It is possible to use said transversal sliding bulkhead as a replacement for the method for unloading two separate loads of fish.
  • FIG 4a is similar to figure 3a a rather simplified schematic top view of a transport tank at the starborard side of a centre bulkhead in a fish carrier.
  • a sliding bulkhead runs in the longitudinal direction of the vessel.
  • the transport tank includes three mixed populations p1 (smallest individual size), p2 (medium size) og p3 (largest individual size) to be unloaded separately.
  • the sliding bulkhead is displaced to a fore end of the tank, which may be done before loading the fish into said vessel.
  • Figure 4b illustates that oxygen rich fresh water is supplied in through inlet (46) by pumping.
  • the sliding bulkhead is displaced astern from the forward position and the populations (p1) and (p2) tend to move towards the water flow through the separation grating to more oxygen rich water in the fore end of the tank, while the largest-grown population (p3) will be displaced astern towards the outlet in the aft end of the tank, and will exit with the tail first due to the direction of the water flow and lack of space in the displaced part of the tank.
  • the fish will now be sorted into (p1+p2) and (p3) at the same time as population (p3) is removed from the tank.
  • population (p3) can be forwarded to a separate fish cage for further feeding or slaughtering.
  • Figure 4c illustrates a preferred method of plausible populations (p1+p2) back to the aft end of the tank by means of turning the water flow in the tank at the same time as running the sliding bulkhead ahead towards the bow in an open position, possibly by a completely open or removed separation grating.
  • Figure 4d illustrates a next step of this method according to the invention in which population (p2) is displaced astern by means of the sliding bulkhead with the separation grating open for population (p1), and in which population p2 is forced out through the outlet at the aft end of the tank.
  • the final steps for forcing out the smallest population (p1) after the situation shown in figure 4d correspond to a repetition of the method illustrated in figure 3c and 3d.
  • fresh water includes fresh oxygen rich seawater taken from the sea, or oxygenated recycled water.

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  • Life Sciences & Earth Sciences (AREA)
  • Marine Sciences & Fisheries (AREA)
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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Farming Of Fish And Shellfish (AREA)
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Abstract

A method for unloading of two different separated populations (p1, p2) of fish in a fish carrier, in which said populations are situated at either end of a bulkhead (6) with a separation grating (60) in a transport tank (0), said grating apertures in said separation grating (60) being restricted to a grating aperture which is less than the individuals in both populations (p1, p2), and the tank being provided with at least one forward inlet (46) for fresh water, and at least one aft outlet (42) for water and fish, comprising the following steps: i) said bulkhead (6) with said separation grating (60) displaces one of the populations (p2) against said outlet (42), so that said population (p2) is forced through said outlet (42); characterized by ii) opening said separation grating (60) and running said bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than a desired portion, preferably all, of the population (p1); iii) restricting said grating apertures in said separation grating (60) to a grating aperture which is less than the individuals in said population (p1) and running said bulkhead (6) astern, so that said bulkhead (6) with said separation grating (60) displaces said second population (p1) towards said outlet (42) so that said population (p1) is forced through said outlet (42).

Description

SLIDING BULKHEAD FOR SORTING OF LIVE FISH
Introduction
This invention relates to an apparatus and method for transport and unloading of several populations of size classes of live fish in a fish carrier. The invention also relates to sorting of live fish in a gentle manner.
Problem and prior art
Displacing live fish in a tank by means of a sliding bulkhead is known, among other things shown in a folder concerning unidirectional flow girder from Skretting. The fish is displaced towards one end of a rectangular tank by means of a sliding bulkhead. The fish arrives at the desired end and is removed from the tank in a crate or a grab, both lifted by means of a crane. An alternative in a fish carrier is to lower the water level and then pump out the fish by means of a vacuum pump. In the last described method the fish is stressed when the water level is lowered, and it also becomes stressed by being vacuum pumped, and this should be undesirable due to animal care and fish quality considerations. Stiffness of death in the fish is caused more quickly when it has been stressed immediately before the slaughter. Salmon badly endures vacuum pumping and easily receives internal bleedings when the pressure abruptly decreases below a pressure of one atmosphere during pumping. Moreover, lowering the water level within the vessel involves a negative influence on the stability of the vessel.
Further it is considered a problem that if the fish comprises two or more populations of size classes of increasing size p1 , p2, ... , pn, the smaller populating p1 would not win the fight for the supplied food. For this reason, an object of the invention with the present invention is to sort the populations in fish carrier with a sliding bulkhead, in a gentle manner.
Another problem is receiving, transporting and unloading several populations p1 , p2 of fish, e.g. received from two different suppliers and owned by two different recipients. A further object of the present invention is to keep these populations separated during transport in one and the same tank, and unloading them separately in a gentle manner. Norwegian patent application NO 2001.2898 belonging to Sintef Fiskeri og havbruk AS, describes a fish carrier having a transport tank in a doubly curved hull, wherein a sliding bulkhead follows the doubly curved profile of the hull during movement of the sliding bulkhead forwards and backwards along the tank, so that the fish is forced out of the hull in the desired direction without stressing the fish in any degree worth mentioning. However, NO 2001.2898 does not suggest any manner of transporting or sorting several populations p1 , p2 of different size classes of fish or fish to be kept separately for other reasons, e.g. due to different species or different ownership.
Short summary of the invention
This invention represents a solution to several of the problems mentioned above, and is a method for unloading of two different separated populations called p1 and p2 of fish in a fish carrier, wherein said populations are located on either side of a sliding bulkhead with a separation grating in a transport tank, said grating apertures in said separation grating being restricted to a grating aperture which is less than the individuals in both populations p1 and p2, and said tank being provided with at least one fore inlet for fresh water, and at least one aft outlet for water and fish, in which the method further comprises the following steps: i) Said sliding bulkhead with said separation grating displace one of the populations p2 towards said outlet, so that said population p2 is forced out through said outlet. Novel features of the invention are the following: ii) Opening said separation grating and running said sliding bulkhead towards said inlet to a position closer to said inlet than a desired part of the popu- lation pl . iii) Restricting said grating apertures in said separation grating to a grating aperture size which is less than the individuals in said population p1 and running said sliding bulkhead astern, so that said sliding bulkhead with said separation grating displace said second population p1 towards said outlet so that said population p1 is forced through said outlet. Brief description of the drawings
The invention is illustrated in the accompanying drawings which are included to illuminate the invention. The drawings should not be interpreted as limiting for the invention, the scope of which should be limited only by the accompanying claims.
Figure 1a is a rather simplified schematic top view of a transport tank at the starboard side of a centre bulkhead in a fish carrier. A sliding bulkhead runs in the longitudinal direction of the tank and the vessel. The transport tank contains two separate populations p1 and p2 to be unloaded separately.
Figure 1b is the same schematic top view in which said sliding bulkhead is displaced astern and forces population p2 out through an outlet in the stern end of said vessel. A large amount of water is supplied from ahead, so that the fish in p2 generally will exit with its tail first and is accelerated out through said outlet when arriving at this, and be pumped to a desired location for intermediate storage, further growth or slaughtering. Figure 1 c shows the same schematic top view of said tank in which said sliding bulkhead now is displaced ahead towards the bow, and in which a separation grating or a hatch is completely open so as to have the fish running through to the larger tank volume astern of said sliding bulkhead without obstruction. Figure 1d illustrates that said sliding bulkhead is again moved astern with said separation grating closed for said population p1 and displaces popu- lation p1 through said outlet for water and fish, this time to another location than for population p2. Figure 2a illustrates two separate populations p1 and p2 on each side of a sliding bulkhead in a fish carrier in which said tank has a wall which is constituted by a curved inner skin in said hull, and a second wall which is constituted by a centre bulkhead.
Figure 2b is the same schematic top view as figure 2a, in which a sliding bulkhead is displaced astern and forces population p2 through an outlet at the stern of said vessel. The figure further illustrates the same situation as in figure 1 b. Figure 2c shows the same schematic top view of said tank in which said sliding bulkhead now is displaced ahead towards the bow, and in which a separation grating is completely open or the transversal sliding bulkhead has been completely withdrawn along said sliding bulkhead, so as to have the fish running through to the larger tank volume astern of said sliding bulkhead without obstruction. Figure 2d illustrates that said sliding bulkhead is moved astern again with said separation grating or transversal sliding bulkhead closed for population p1 and displaces population p1 through said outlet for water and fish, this time also preferably to another location than for population p2. Figure 3a is similar to figure 1 a a rather simplified schematic view of a transport tank at the starboard side of a centre bulkhead in a fish carrier. A sliding bulkhead runs in the longitudinal direction of said tank and said vessel. The difference from figures 1 and 2 is that said transport tank includes two mixed populations p1 and p2 to be unloaded separately. Said sliding bulkhead has been run to a fore end of said tank. Figure 3b illustrates that oxygen rich fresh water is supplied by pumping through an inlet 46. Said sliding bulkhead is displaced astern from the position ahead and population p1 will tend to move against the water flow through said separation grating to a more oxygen rich water in said fore part of said tank, while the more large-size population p2 will be displaced towards said outlet astern of said tank, and will exit with the tail first due to the water flow and lack of space in the displaced part of said tank. The fish is now sorted at the same time as said population p2 is removed from the tank. Figure 3c illustrates a preferred mode of tempting the population p1 back to the aft part of the tank by means of turning the water flow in the tank at the same time as the sliding bulkhead is run ahead towards the bow in an open position, e.g. also with a completely open or removed separation grating. Figure 3d illustrates the final part of this method according to the invention in which the population p1 is displaced astern by said sliding bulkhead with said separation grating closed for population p1 , and in which population p1 is forced out through said outlet at the stern end of said tank. Figure 4a is like figure 3a a rather simplified schematic top view of a transport tank at the starboard side of a centre bulkhead in a fish carrier. As explained above, a sliding bulkhead runs in the longitudinal direction of said tank and said vessel. The difference from figure 3 is that the transport tank contains three mixed populations p1 (smallest individual size), p2 (medium size) and p3 (largest individual size) to be unloaded separately. Said sliding bulkhead is displaced to a fore end of said tank.
Figure 4b illustrates that oxygen rich fresh water is pumped through an inlet 46. Said sliding bulkhead is displaced astern from the fore position and the populations p1 and p2 tend to move against the water flow through said separation grating to more oxygen rich water in the fore part of said tank, while the large-size population p3 will be displaced astern towards the outlet at the aft of the tank, and will exit with the tail first due to the water flow and lack of space in the displaced part of said tank. The fish is now sorted in (p1+p2) and (p3) at the same time as the population p3 is removed from the tank. Figure 4c illustrates a preferred mode of tempting populations (p1+p2) back to the aft part of the tank by means of turning the water flow in the tank at the same time as the sliding bulkhead is displaced ahead towards the bow in its open position, e.g., with a completely open or removed separation grating. Figure 4d illustrates a next part of this method according to the invention in which the population p2 is displaced astern by means of the bulkhead with the separation grating open for population p1 , and in which population p2 is forced out through the outlet at the stern end of said tank.
Description of preferred embodiments of the invention: Transport and unloading of two separate populations.
Figure 1a is a rather simplified schematic top view of a transport tank 0 at the starboard side of a centre bulkhead 1 in a fish carrier. A sliding bulkhead 6 is arranged, which may run in the longitudinal direction of said tank 0 and said vessel. In a first embodiment of the invention, said transport tank contains two separate populations p1 and p2 to be unloaded separately.
According to one embodiment of the invention, it is a method for unloading two different populations p1 and p2 of fish from a fish carrier with a sliding bulkhead 6 with a separation grating 60 in a transport tank 0 with at least one fore inlet 46 for fresh water and at least one aft outlet 42 for water and fish, and in which the grating apertures in said separation grating 60 are restricted to be smaller than the individuals in both populations (p1,p2), in which the method comprises the following steps: i) Said sliding bulkhead (6) with said separation grating (60) are displaced astern and displace one of said populations (p2) towards said outlet (42) so that said population (p2) is forced out through said outlet (42). ii) Said separation grating (60) is opened and said sliding bulkhead (6) is displaced towards said inlet (46) to a position closer to said inlet than a desired part of population (p1). Preferably, said sliding bulkhead is displaced so as to pass the complete population (p1). iii) Said separation grating is restricted to a grating aperture which is less than the fish size in population (p1) of smaller individuals and said sliding bulkhead is displaced astern, so that said sliding bulkhead (6) with said separation grating (60) displace said second population (p1) towards said outlet (42) so that said population (p1) is forced out through said outlet
(42). Fish in a confined space will use oxygen in the water and will as a rule swim towards more oxygen rich water which is supplied. The applicant has in experiments supplied water flow of fresh seawater in different directions through said tank under displacement of the fish, and experienced that the fish tends to swim towards the fresher water and exit backwards through said outlet (42) if fresh water in a sufficient water flow is supplied through said inlet (46). For this reason, according to a preferred embodiment of the method of the invention, it comprises pumping of fresh water through said inlet (46) so that water flows through said tank and exits through said outlet (42), at the same time as point i) in which said sliding bulkhead (6) with said separation grating (60) displace one of said populations (p2) towards said outlet (42) so that said population (p2) is forced out through said outlet (42).
According to a further preferred embodiment of the method, it further comprises pumping of fresh water in through inlet (46) so that water flows through said tank and out through outlet (42), at the same time as point (iii) above with closing of said separation grating (60) and displacement of said sliding bulkhead (6) astern. Said sliding bulkhead (6) with said separation grating (60) will then displace said second population (p1) towards said outlet (42) so that said population (p1) is forced out through said outlet (42), and said tank is at this time emptied of these two populations.
Sorting of the fish into two populations
According to another aspect of the invention a method may be used for sorting at least two mixed populations (p1 , p2) of fish into at least two different size classes called a population (p1) of smaller-size fish and a population (p2) of larger-size fish, in a fish carrier with a sliding bulkhead (6) with a separation grating (60) in a transport tank (0) with at least on fore inlet (46) for fresh water and at least one aft outlet (42) for water and fish. The method comprises the following steps: i) Said separation grating (60) is opened and said sliding bulkhead (6) is displaced towards said inlet (46) to a position closer to said inlet
(46) than a desired part of said populations (p1 , p2). This can also be done before loading the fish to said vessel, so that said sliding bulk- ahead of the complete amount of fish in populations (p1 ,p2). ii) Said separation grating (60) is restricted to a grating aperture less than the size of population (p2) and said sliding bulkhead (6) is displaced astern, so that said sliding bulkhead (6) with said separation grating (60) displaces said larger population (p2) towards said outlet
(42). Population (p2) may then in the preferred embodiment be forced out through outlet (42) and be pumped to a desired intermediate storage, further growth, or slaughtering, iii) Said separation grating (60) is opened and said sliding bulkhead (6) is displaced towards said inlet (46) to a position closer to said inlet (46) than a desired part, preferably all, of said population (p1) of smaller individuals, iv) Said grating apertures in said separation grating (60) are restricted, and said sliding bulkhead (6) with said separation grating (60) are displaced astern so that population (p1) of smaller individuals is displaced towards said outlet (42) and may be forced out through oultiet (42).
Similarly as above, intake of fresh water through the fore inlet (46) and outlet of water through outlet 42 could be included in an advantageous preferred embodiment of the invention, simultaneously with step (ii) with restricting said separation grating (60) to grating aperture less than said populations (p2) size and displacement of said sliding bulkehead (6) astern, so that said sliding bulkhead (6) with said separation grating (60) displace said larger poulation (p2) towards said outlet (42) so that said population (p2) may be forced out through outlet (42). According to an further preferred embodiment of the invention, the method comprises intake of fresh water through an aft inlet (48) so that the water flow in said tank flows from astern and ahead in said tank (0) with outlet of water through a fore outlet (47) during step (iii) with opening of said separation grating (60) and running of said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than the desired part, preferably all, of said population (p1) of smaller individuals. Possible use of transversal sliding bulkhead as separation grating
It is also possible to utilize a transversal sliding bulkhead 7 for forming a simple aperture as "separation grating" between a fore and aft part of said tank 0. Even though it could be difficult to control the exact size of said aperture which in such case is formed between said transversal sliding bulkhead 7 and said inner skin 11 of said curved side of the ship, this could function as a possible solution for unloading two separate populations (p1 ,p2) of fish, please see Figure 2a which illustrates two separate populations (p1 and p2) being on either side of a sliding bulkhead in a fish carrier, in which said tank has a wall which is constituted by a curved inner skin in the hull, and a second wall which is constituted by a centre bulkhead.
Figure 2b is the same schematic top view as Figure 2a, in which said sliding bulkhead is displaced astern and forces population (p2) out through an outlet in said aft end of said vessel. Figure 2c shows the same schematic top view of said tank, in which said sliding bulkhead (6) now is displaced ahead towards the bow, and in which a separation grating is completely open and/or said transversal sliding bulkhead has been completely withdrawn along said sliding bulkhead, in order to have the fish flow through to the larger tank volume astern of said sliding bulkhead without obstruction.
Figure 2d illustrates that said sliding bulkhead is displaced astern again with said separation grating and/or said transversal sliding bulkhead closed for population p1 , and forces population p1 out through said outlet for water and fish, this time also preferably to another location than for population p2. Figures 2a-2d illustrates a sliding bulkhead with both an adjustable separation grating and a transversal sliding bulkhead. It is possible to use said transversal sliding bulkhead as a replacement for the method for unloading two separate loads of fish. It would be more difficult, but not impossible, to sort a mixed load of two population as shown in Figure 3a-d by allowing a conse- cutively adjusted grating aperture between said transversal sliding bulkhead 7 and said inner skin 11 for replacing said separation grating 60 in said sliding bulkhead. Said separation grating 60 could also be arranged in said transversal sliding bulkhead 6.
Sorting of the fish into three size classes Sorting the fish into at least three size classes is possible by means of a single sliding bulkhead. Figure 4a is similar to figure 3a a rather simplified schematic top view of a transport tank at the starborard side of a centre bulkhead in a fish carrier. As explained above, a sliding bulkhead runs in the longitudinal direction of the vessel. The difference from figure 3 is that the transport tank includes three mixed populations p1 (smallest individual size), p2 (medium size) og p3 (largest individual size) to be unloaded separately. The sliding bulkhead is displaced to a fore end of the tank, which may be done before loading the fish into said vessel.
Figure 4b illustates that oxygen rich fresh water is supplied in through inlet (46) by pumping. The sliding bulkhead is displaced astern from the forward position and the populations (p1) and (p2) tend to move towards the water flow through the separation grating to more oxygen rich water in the fore end of the tank, while the largest-grown population (p3) will be displaced astern towards the outlet in the aft end of the tank, and will exit with the tail first due to the direction of the water flow and lack of space in the displaced part of the tank. The fish will now be sorted into (p1+p2) and (p3) at the same time as population (p3) is removed from the tank. Thus, population (p3) can be forwarded to a separate fish cage for further feeding or slaughtering.
After the situation in Figure 4b, two size classes will be present in the fore part of the tank. Figure 4c illustrates a preferred method of tempting populations (p1+p2) back to the aft end of the tank by means of turning the water flow in the tank at the same time as running the sliding bulkhead ahead towards the bow in an open position, possibly by a completely open or removed separation grating. Figure 4d illustrates a next step of this method according to the invention in which population (p2) is displaced astern by means of the sliding bulkhead with the separation grating open for population (p1), and in which population p2 is forced out through the outlet at the aft end of the tank. The final steps for forcing out the smallest population (p1) after the situation shown in figure 4d correspond to a repetition of the method illustrated in figure 3c and 3d.
The term fresh water includes fresh oxygen rich seawater taken from the sea, or oxygenated recycled water.

Claims

1. A method for unloading of two different separated populations (p1 , p2) of fish in a fish carrier, in which said populations are situated at either side of a bulkhead (6) with a separation grating (60) in a transport tank (0), said grating apertures in said separation grating (60) being restricted to a grating aperture which is less than the individuals in both populations (p1 , p2), and the tank being provided with at least one fore inlet (46) for fresh water, and at least one aft outlet (42) for water and fish, comprising the following steps: i) said bulkhead (6) with said separation grating (60) displace one of the populations (p2) towards said outlet (42), so that said population (p2) is forced through said outlet (42); characterized by ii) opening said separation grating (60) and running said bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than a desired part, preferably all, of the population (p1); iii) restricting said grating apertures in said separation grating (60) to a grating aperture which is less than the individuals in said population (p1) and running said bulkhead (6) astern, so that said bulkhead (6) with said separation grating (60) displace said second population (p1) towards said outlet (42) so that said population (p1) is forced through said outlet (42).
2. Method according to claim 1 , further comprising pumping of fresh water through said inlet (46) so that water flows through said tank and out through said outlet (42), simultaneously with step i), in which said bulkhead (6) with said separation grating (60) displace said one of the populations (p2) towards said outlet (42) so that said population (p2) is forced through said outlet (42).
3. Method according to claim 1 , further comprising pumping of fresh water through said ^let (46) so that water is flowing through said tank and out through said outlet (42), simultaneously with step iii) with closing of said separation grating (60) and running said bulkhead (6) astern, so that said bulkhead (6) with said separation grating (60) force said second population (p1) towards said outlet (42) so that said population (p1) is forced through said outlet (42).
4. Method according to claim 1 , wherein said separation grating (60) is replaced by an aperture arranged between a side bulk head (7) on said bulkhead (6) and an inner skin (11 ) of a curved hull which forms a wall in said tank (0).
5. Method for sorting of mixed populations (p1 ,p2) of fish into two different size classes called a population (p1 ) of smaller-size fish and a population (p2) of larger-size fish, in a fish carrier with a sliding bulkhead (6) with a separation grating (60) in a transport tank (0) with at least one fore inlet (46) for fresh water and at least one aft outlet (42) for water and fish, characterized in that it comprises the following steps: i) opening said separation grating (60) and running said sliding bulkhead (6) towards the inlet (46) to a position closer to the inlet (46) than a desired part, preferably all, of the populations (p1 , p2); ii) restricing the separation grating (60) to grating aperture less than the size of population (p2) and running said sliding bulkhead (6) astern, so that said sliding bulkhead (6) with the separation grating (60) displace the larger population (p2) towards the outlet (42) so that population (p2) is forced out through outlet (42); iii) opening said separation grating (60) and running of said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than a desired part, preferably all, of the population (p1) of smaller individuals; and iv) restricting said grating apertures in said separation grating (60) and running of said sliding bulkhead (6) with said separation grating (60) astern so that population (p1) of smaller individuals is displaced towards said outlet (42) and is forced out through said outlet (42).
6. Method according to claim 5, comprising intake of fresh water through said fore inlet (46) and outlet of water through outlet (42), simultaneously with step (ii) with restricting said separation grating (60) to a grating aperture which is less than the size of population (p2) and running of said sliding bulkhead (6) astern, so that said sliding bulkhead with the separation grating (60) displace said larger population (p2) towards said outlet (42) so that population (p2) is forced out through outlet (42).
7. Method according to claim 5, comprising intake of fresh water through an aft inlet (48) so that the water flow in the tank comes from astern and ahead in the tank (0) with outlet of water through a fore outlet (47) under step (iii) with opening of said separation grating (60) and running of said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than the desired part, preferably all, of the population (p1) of smaller individuals.
8. Method for sorting of at least three mixed populations (p1 ,p2,p3) of fish to at least three different size classes called a population (p1) of smallest-size fish and a population (p2) of medium-size fish, and a population (p3) of largest-size fish, in a fish carrier with a sliding bulkhead (6) with a separation grating (60) in a transport tank (0) with at least one fore inlet (46) for fresh water and at least one aft outlet for water and fish, characterized in that it comprises the following steps: i) opening said separation grating (60) and running of said sliding bulkhead
(6) towards said inlet (46) to a position closer to said inlet (46) than the popula- tions (p1 ,p2,p3); ii) restricting said separation grating (60) to grating aperture less than the size of population (p3) and running of said sliding bulkhead (6) astern, so that said sliding bulkhead (6) with separation grating (60) displace the largest-size poulation (p3) towards said outlet (42) so that population (p3) is forced out through said outlet (42) and forwarded to a desired location; iii) complete opening of said separation grating (60) and running of said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than populations (p1 , p2) of smallest-size and medium-size individuals; iv) restricting said grating apertures in said separation grating (60) to a size which blocks population (p2) and allows population (p1) to pass through and consecutively running said sliding bulkhead (6) with said separation grating (60) astern so that population (p2) of medium-size individuals is displaced towards said outlet (42) and is forced out through said outlet (42); v) opening said separation grating (60) completely and running said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than population (p1) of smallest-size individuals; and vi) restricting grating apertures in said separation grating (60) to a size which blocks population (p1), with consecutive running of said sliding bulkhead with said separation grating astern so that population (p1.) of smallest individuals is displaced towards said outlet (42) and is forced out through outlet (42).
9. Fish carrier for sorting of mixed populations (p1 ,p2) of fish into two different size classes called a population (p1) of smaller-size fish and a population (p2) of larger-size fish, with a sliding bulkhead (6) with a separation grating (60) in a transport tank (0) with at least one fore inlet (46) for fresh water and at least one aft outlet (42) for water and fish, characterized in that it comprises the following features: i) an adjustable separation grating (60) for running of said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than a desired part, preferably all, of said populations (p1 ,p2); ii) in which separation grating (60) is arranged for restriction to a grating aperture which is less than the size of said population (p2) for running of said sliding bulkhead astern, so that said sliding bulkhead (6) with separation grating (60) can displace said larger-size population (p2) towards said outlet (42) so that said population (p2) is forced through said outlet (42); iii) , that said separation grating (60) is arranged to be opened and that said sliding bulkhead (6) is arranged to be run towards said inlet (46) to a position - • closer to said inlet (46) than said population (p1) of smaller-size individuals; iv) that said grating apertures in said sepatation grating (60) is restrictable and that said sliding bulkhead with said separation grating (60) can be run astern so that said population (p1) of smaller-size individuals is forced towards said outlet (42) and forced out through outlet (42).
0. Fish carrier according to claim 9, comprising a fore inlet (46) for intake of fresh water and an aft outlet for water.
11. Fish carrier according to claim 9, comprising an aft inlet (48) for fresh water so that the water flow in said tank may take place from astern and ahead in said tank (0) with outlet of water through a fore outlet (47) during step (iii) with opening of said separation grating (60) and running of said sliding bulkhead (6) towards said inlet (46) to a position closer to said inlet (46) than the desired part, preferably all, of said population (p1) of smaller- size individuals.
PCT/NO2003/000140 2002-05-02 2003-04-30 Sliding bulkhead for sorting of live fish WO2003092369A1 (en)

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CA002483681A CA2483681C (en) 2002-05-02 2003-04-30 Sliding bulkhead for sorting of live fish
AU2003228154A AU2003228154A1 (en) 2002-05-02 2003-04-30 Sliding bulkhead for sorting of live fish
EP03725895A EP1499179B1 (en) 2002-05-02 2003-04-30 Sliding bulkhead for sorting of live fish
DE60318194T DE60318194D1 (en) 2002-05-02 2003-04-30 SLIDING WALL FOR SORTING LIVE FISHING
DK200401818A DK176601B1 (en) 2002-05-02 2004-11-23 Method of unloading two different, separate populations of fish, and methods and fishing transport vessel for sorting mixed populations of fish

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NO20022116A NO315351B1 (en) 2002-05-02 2002-05-02 Method and apparatus for transporting, unloading and sorting live fish in a well boat
NO20022116 2002-05-02

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US20120117850A1 (en) * 2009-07-20 2012-05-17 Vlatko Panovic Fishing boat and method for catching fish
RU2457677C2 (en) * 2009-10-19 2012-08-10 ОАО "Новочеркасский рыбокомбинат" Device for sorting larvae and young sturgeons
WO2013015692A1 (en) * 2011-07-28 2013-01-31 Hoseth Klaus Screw tank with discharge arrangements for unloading foodstuff at a level above the upper part of the auger shaft
WO2013108251A3 (en) * 2012-01-17 2013-10-10 Crystal Vision Agricultural Cooperative Society Ltd. Device for use in monitoring fish condition
NO334577B1 (en) * 2011-07-28 2014-04-14 Klaus Hoseth Screw tank dispensing arrangement for food dispensing, and method of transporting food out of a screw tank
CN106508768A (en) * 2016-12-16 2017-03-22 黄山石屋坑冷水鱼家庭农场有限公司 Fish fry sorting box
DE102015011965A1 (en) * 2015-09-18 2017-03-23 HanseFisch Anlagenbau GmbH & Co. KG Device for sizing commercial fish
CN106962255A (en) * 2017-03-31 2017-07-21 桂媛媛 A kind of yellow eel sorter
CN107223624A (en) * 2017-06-05 2017-10-03 苏州弗士曼精密机械有限公司 A kind of communicate-type transports water tank
DE102018130232B3 (en) * 2018-11-29 2019-11-14 Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung Sorting device for live fish
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US20210076645A1 (en) * 2014-08-27 2021-03-18 Vaki Fiskeldiskerfi Hf Automatic Grading System for Living Aquatic Organisms
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US20120117850A1 (en) * 2009-07-20 2012-05-17 Vlatko Panovic Fishing boat and method for catching fish
RU2457677C2 (en) * 2009-10-19 2012-08-10 ОАО "Новочеркасский рыбокомбинат" Device for sorting larvae and young sturgeons
WO2013015692A1 (en) * 2011-07-28 2013-01-31 Hoseth Klaus Screw tank with discharge arrangements for unloading foodstuff at a level above the upper part of the auger shaft
NO334577B1 (en) * 2011-07-28 2014-04-14 Klaus Hoseth Screw tank dispensing arrangement for food dispensing, and method of transporting food out of a screw tank
WO2013108251A3 (en) * 2012-01-17 2013-10-10 Crystal Vision Agricultural Cooperative Society Ltd. Device for use in monitoring fish condition
US20210076645A1 (en) * 2014-08-27 2021-03-18 Vaki Fiskeldiskerfi Hf Automatic Grading System for Living Aquatic Organisms
US12022811B2 (en) * 2014-08-27 2024-07-02 Vaki Fiskeldiskerfi Hf Automatic grading system for living aquatic organisms
DE102015011965A1 (en) * 2015-09-18 2017-03-23 HanseFisch Anlagenbau GmbH & Co. KG Device for sizing commercial fish
CN106508768A (en) * 2016-12-16 2017-03-22 黄山石屋坑冷水鱼家庭农场有限公司 Fish fry sorting box
CN106962255A (en) * 2017-03-31 2017-07-21 桂媛媛 A kind of yellow eel sorter
CN106962255B (en) * 2017-03-31 2020-05-12 桂媛媛 Eel separator
CN107223624A (en) * 2017-06-05 2017-10-03 苏州弗士曼精密机械有限公司 A kind of communicate-type transports water tank
DE102018130232B3 (en) * 2018-11-29 2019-11-14 Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung Sorting device for live fish
WO2020108690A1 (en) 2018-11-29 2020-06-04 Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung Sorting device for live fish
CN112996383A (en) * 2018-11-29 2021-06-18 艾尔弗雷德韦格纳研究所赫尔姆霍茨极地与海洋研究中心 Sorting device for live fish
CN110521659A (en) * 2019-09-24 2019-12-03 张云飞 A kind of automatic control fry size separates device and its application method
WO2022139591A1 (en) * 2020-12-22 2022-06-30 Mmc First Process As Systems and methods for handling farmed aquatic animals
WO2022139590A1 (en) * 2020-12-22 2022-06-30 Mmc First Process As Moving farmed aquatic animals
US20220201988A1 (en) * 2020-12-29 2022-06-30 Mmc First Process As Moving farmed aquatic animals
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NO20022116D0 (en) 2002-05-02
DE60318194D1 (en) 2008-01-31
ATE381259T1 (en) 2008-01-15
CA2483681A1 (en) 2003-11-13
EP1499179B1 (en) 2007-12-19
NO20022116A (en) 2003-08-25
EP1499179A1 (en) 2005-01-26
AU2003228154A1 (en) 2003-11-17
DK176601B1 (en) 2008-11-03
CA2483681C (en) 2007-07-24
NO315351B1 (en) 2003-08-25

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