Harvesting device for aquaculture facility

Abstract

This harvesting device for an aquaculture facility comprises: a water tank for accommodating aquaculture objects; one or two driving tools each having an outer shape corresponding to the cross-sectional shape of an inner wall side surface and an inner wall bottom surface of the water tank, and being movable to drive the aquaculture objects into a harvesting area; and a lifting tool for lifting the aquaculture objects within the harvesting area, which is surrounded by the one driving tool and the inner wall side surface or by the two driving tools and the inner wall side surface. The driving tool has a first passage selection member having a gap slightly smaller than the size (width) of the aquaculture objects to be harvested in order to prevent the passage of the aquaculture objects exceeding the size (width). The lifting tool comprises a support member that is movable in the vertical direction and is tiltable downward toward the inner wall side surface of the water tank, and a lifting member that is supported by the support member and lifts the aquaculture objects within the harvesting area.

Description

Aquaculture equipment harvesting equipment

[0001] The present invention relates to a harvesting device for an aquaculture facility, and more particularly to a harvesting device for an aquaculture facility including a land-based aquaculture facility represented by a closed recirculating aquaculture system (RAS).

[0002] Closed recirculating land-based aquaculture systems (RAS) are currently considered to be the aquaculture management system with the least environmental impact, and a major challenge for aquaculture facilities including such RAS is how to efficiently harvest shippable aquaculture targets from the aquaculture tanks.

[0003] Patent Document 1 discloses a farmed fish suction device as a harvesting device for taking farmed fish in a farm net set up in the sea into a tank on a carrier ship. With this farmed fish suction device, the inside of the farm net and the onboard tank are connected through a suction port, and seawater in the onboard tank is discharged overboard using a drainage motor, causing the seawater in the farm net to flow into the onboard tank, and at the same time, the fish in the farm net are sucked into the tank by the ocean current, thereby harvesting.

[0004] Patent Document 2 discloses a harvesting device that harvests crustaceans such as crabs in individual containers using a manipulator that is driven and controlled in conjunction with an image acquisition device.

[0005] JP 53-122590 A JP 2016-202094 A

[0006] However, the harvesting device described in Patent Document 1 is a harvesting device that takes fish from aquaculture facilities installed at sea into a tank on a carrier ship, so it is difficult to apply the configuration of this harvesting device to aquaculture facilities that do not use carrier ships, and it is not possible to sort the aquaculture targets by size.

[0007] The harvesting device described in Patent Document 2 is a device that harvests crustaceans using a manipulator, so it cannot be used as a harvesting device for large quantities of fish, shrimp, etc., which are generally used for aquaculture, and it is also not possible to sort the aquaculture targets by size.

[0008] The present invention solves the above-mentioned problems of the prior art, and its purpose is to provide a harvesting device for an aquaculture facility that can selectively harvest only culture targets that are larger than a desired size from a large number of culture targets in the aquaculture facility.

[0009] Another object of the present invention is to provide a harvesting device for aquaculture facilities that can efficiently harvest without damaging the cultured object.

[0010] According to the present invention, a harvesting device for an aquaculture facility includes a tank for accommodating aquaculture targets, one or two driving tools having an outer shape corresponding to the cross-sectional shapes of the inner wall side and bottom of the tank and movable for driving the aquaculture targets into a harvesting area, and a lifting tool for lifting the aquaculture targets in the harvesting area surrounded by the one driving tool and the inner wall side or the two driving tools and the inner wall side. The driving tool includes a first passing screening member having a gap slightly smaller than the size (width) of the target to be harvested to prevent the passage of aquaculture targets larger than the size (width) of the target to be harvested. The lifting tool includes a support member that is movable in the vertical direction and can be tilted downward toward the inner wall side of the tank, and a lifting member that is supported by the support member and lifts the aquaculture targets in the harvesting area.

[0011] As described above, the harvesting device for the aquaculture facility of the present invention harvests in a two-stage process: the driving tool moves slowly (at a low speed) to drive the cultured target into the harvest area, and the hauling tool slowly (at a low speed) hauls the cultured target from the harvest area. This prevents damage to the cultured target. Furthermore, since a large amount of cultured target can be harvested efficiently, the workload can be significantly reduced. Furthermore, because the driving tool includes a first passing / screening member with a gap slightly smaller than the size (width) of the cultured target to be harvested, cultured target larger than the desired size (width) cannot pass through. This ensures that only cultured target larger than the desired size (width) can be reliably selected from a large amount of cultured target, resulting in efficient harvesting. Unlike harvesting devices using a fish pump, the harvesting device of the present invention selectively harvests only cultured target larger than the desired size (width). Rather than simply harvesting, it can select and harvest by size. Furthermore, unlike a fish pump, it does not require the large amount of power consumption and capital investment required for a fish pump, making it an extremely economical harvesting device.

[0012] It is preferable that the lifting member is configured to lift all of the culture targets in the harvest area. If the culture targets in the harvest area have been selected by the driving tool to only those of a size that should be harvested, the device configuration can be simplified by configuring the lifting member to lift all of the culture targets.

[0013] It is also preferable that the lifting member is provided with a second pass-through sorting member having a gap slightly smaller than the size to be harvested in order to prevent the passage of cultured objects larger than the size to be harvested. Since sorting is performed both by the first pass-through sorting member and the second pass-through sorting member, a double sorting process is performed, making it possible to more reliably harvest only individuals of the desired size.

[0014] It is preferable that the first passing sorting member or the second passing sorting member has a plurality of bar members extending parallel to each other, and adjacent bar members have the above-mentioned gap.

[0015] In this case, it is preferable that the gap between the multiple bar members is adjustable or fixed. Configuring the gap to be adjustable makes it possible to select culture targets of a desired size without replacing the first or second passing sorting member, making the operation easier. Furthermore, configuring the gap to be fixed simplifies the structure of the first or second passing sorting member, making operation easier and reducing product costs.

[0016] In this case, it is further preferable that each of the plurality of bar members has a round rod and a cylindrical body through which the round rod is inserted and which can rotate around the round rod. By surrounding the round rod with the rotatable cylindrical body, damage to the aquaculture subjects is significantly reduced.

[0017] It is also preferable that the first passing sorting member or the second passing sorting member is a mesh member having mesh openings (gaps) of a predetermined size.

[0018] It is also preferable that the first passing sorting member has a first outer frame member and a second outer frame member, each of which has a net member provided over its entire surface, and that the first outer frame member and the second outer frame member are slidable relative to each other while overlapping each other. Because the gap can be adjusted by sliding, it is possible to select culture targets of a desired size without replacing the first passing sorting member, making work easier. Furthermore, because it is a sliding mechanism, the configuration is simple and any gap can be easily set.

[0019] Preferably, the driving tool further comprises a frame member having a pair of frame members whose outer periphery moves along the inner wall side and bottom surfaces of the tank and is spaced a predetermined distance apart in the direction of movement, and the first passing sorting member is removably insertable between the pair of frame members. Because the first passing sorting member is removably insertable into the frame member, it is possible to freely select a desired type of first passing sorting member, one with a different gap, etc., which is extremely convenient.

[0020] In this case, it is also preferable that the frame members (a pair of frame members) of the driving tool have brush members on the outer periphery and lower edge, respectively, that slide along the inner side and bottom walls of the tank. By providing the brush members, the inner side and bottom walls of the tank can be cleaned and the material to be removed, including suspended solids (SS), can be collected in the harvesting area, thereby reducing the labor required for cleaning.

[0021] It is also preferable that the lifting tool has a side wall member for preventing the culture target to be harvested from jumping out. By providing the side wall member, even if the culture target jumps out during lifting, it can be prevented from jumping out.

[0022] It is also preferable that the water tank has a groove formed along the side surface of the inner wall and a bottom surface of the inner wall that slopes downward toward the groove. By forming the groove in the water tank and having the bottom surface of the inner wall that slopes downward toward the groove, materials to be removed, such as SS, can be easily collected in the groove, making cleaning of the materials to be removed easier.

[0023] It is also preferable that the water tank has a cylindrical inner wall with a rotatable pole in the center, and that the driving tool has one end connected to the pole and is rotatable around the pole.

[0024] It is also preferable that the water tank has an inner wall of a rectangular parallelepiped shape, and that one end of the driving tool be connectable to a linearly moving member that is movable along the side wall of the water tank.

[0025] According to the present invention, harvesting is performed in a two-stage process: the driving tool slowly moves to drive the cultured target into the harvest area, and the hauling tool slowly hauls the cultured target from the harvest area. This prevents damage to the cultured target. Furthermore, since a large amount of cultured target can be harvested efficiently, labor load can be significantly reduced. Furthermore, because the driving tool is equipped with a first passing / screening member with a gap slightly smaller than the size of the cultured target to be harvested, cultured target larger than the desired size cannot pass through. This ensures that only cultured target larger than the desired size can be reliably selected from a large amount of cultured target, resulting in efficient harvesting. Unlike harvesting devices using a fish pump, the harvesting device of the present invention selectively harvests only cultured target larger than the desired size, allowing for the selection and harvesting of individual individuals by size, rather than simply harvesting. Furthermore, unlike fish pumps, it does not require the large amount of power consumption and capital investment required for a fish pump, making it an extremely economical harvesting device.

[0026] 1. A perspective view schematically showing the overall configuration of an onshore aquaculture facility in one embodiment of the present invention. 2. A plan view schematically showing the overall configuration of the onshore aquaculture facility in the embodiment of Figure 1. 3. A perspective view schematically showing the configuration of the water tank in the embodiment of Figure 1. 4. An axial sectional view schematically showing the configuration of the water tank and the driving tool in the embodiment of Figure 1. 5. A perspective view schematically showing the configuration of a frame member of the driving tool in the embodiment of Figure 1. 6. A plan view schematically showing the configuration of the frame member of the driving tool in the embodiment of Figure 1. 7. A side view schematically showing one configuration example of a first passing sorting member of the driving tool in the embodiment of Figure 1. 8. A side view schematically showing another configuration example of the first passing sorting member of the driving tool in the embodiment of Figure 1. 9. A side view schematically showing yet another configuration example of the first passing sorting member of the driving tool in the embodiment of Figure 1. 10. An explanatory view illustrating an example of a gap adjustment structure of the first passing sorting member of Figure 9. 11. An explanatory view illustrating another example of the gap adjustment structure of the first passing sorting member of Figure 9. 12. An exploded perspective view schematically showing the configuration of the lifting tool in the embodiment of Figure 1. 13. An exploded side view schematically showing the configuration of the lifting tool in the embodiment of Figure 1. 21 is a perspective view showing a schematic configuration of a support member of a lifting tool in the embodiment of FIG. 1. FIG. 22 is an explanatory view showing a schematic configuration of a side wall member of a lifting tool in the embodiment of FIG. 1. FIG. 23 is a perspective view showing a schematic configuration example of a second pass sorting member of a lifting tool in the embodiment of FIG. 1. FIG. 24 is a perspective view showing a schematic configuration example of a second pass sorting member of a lifting tool in the embodiment of FIG. 1. FIG. 25 is a perspective view showing a schematic configuration example of a second pass sorting member of a lifting tool in the embodiment of FIG. 1. FIG. 26 is a perspective view showing a schematic configuration example of a frame member and a first pass sorting member of a driving tool in a further embodiment of the present invention. FIG. 27 is a side view showing a schematic configuration example of a first pass sorting member of a driving tool in the embodiment of FIG. 21. FIG. 28 is a perspective view and explanatory view showing a schematic configuration example of a driving tool in yet another embodiment of the present invention. FIG. 29 is an explanatory view showing an example of a gap adjustment structure of a first pass sorting member in a further embodiment of the present invention.

[0027] 1 and 2 show a schematic diagram of the overall configuration of a land-based aquaculture facility according to one embodiment of the present invention. This embodiment is a harvesting device for a tank having a cylindrical inner wall. While the following describes an embodiment relating to a land-based aquaculture facility, the present invention is not limited to land-based aquaculture facilities and can also be applied to aquaculture facilities other than land-based aquaculture facilities, such as marine aquaculture facilities where nets are stretched over the ocean for aquaculture, and coastal aquaculture facilities where shrimp and other species are cultivated on former salt pan sites.

[0028] In Figures 1 and 2, 10 denotes a cylindrical tank with an inner wall in which aquaculture water for land-based aquaculture of fish, shrimp, and other aquaculture targets is contained along with the aquaculture targets; 11 denotes a slowly rotatable pole located in the center of the tank; 12 denotes multiple support arms for supporting the pole; 13 denotes multiple struts supporting the support arms 12; and 14 denotes multiple piers located above the tank 10 on which workers can walk. The pole 11 is made of stainless steel to prevent rust, and in this embodiment, it is configured to rotate very slowly in one direction using a reducer connected to a motor. However, in a modified version of this embodiment, the pole 11 does not rotate, and two driving tools 20 can be manually rotated around the pole 11. The support arms 12 are made of a single pipe made of a rust-resistant resin material or the like, and are firmly fixed to the struts 13 using diagonal braces. The pier 14 is constructed, for example, by picket scaffolding (wedge-tightened scaffolding), some of which (three of them) extend in the direction of the support columns 13 to increase strength.

[0029] In these figures, reference numeral 15 denotes a harvesting area for harvesting the cultured targets, and in this embodiment, the cultured targets are driven into this harvesting area 15 by being sandwiched between two driving tools 20 (described later) and the side surfaces of the inner wall, and then pulled up by a pulling tool 23 and placed into a container located outside the aquarium 10 or another aquarium, thereby harvesting the cultured targets. In other words, harvesting is performed in a two-stage process in which the driving tools 20 move slowly to drive the cultured targets into the harvesting area 15, and the pulling tool 23 slowly pulls up the cultured targets from the harvesting area 15, allowing efficient harvesting without damaging the cultured targets. A pier 14 is located near the harvesting area 15, allowing workers to perform work in the harvesting area 15.

[0030] FIG. 3 shows a schematic structure of the water tank 10 in this embodiment, and FIG. 4 shows a schematic structure of the water tank 10 and the driving tool 20 in this embodiment.

[0031] As shown in Figures 3 and 4, the inner wall side surface 10a of the aquarium 10 is cylindrical, and the pole 11 is coaxially mounted in its center. A groove 10b is formed around the entire circumference of the bottom surface of the aquarium 10 along the inner wall side surface 10a, and the inner wall bottom surface 10c slopes downward from the central installation position of the pole 11 toward the circumferential groove 10b. As shown in Figure 4, a driving tool 20 is mounted within the aquarium 10, with its inner peripheral edge (one of the shorter horizontal ends) positioned close to the surface of the pole 11. The driving tool 20 is connectable to the pole 11, and is configured to slowly rotate together with the pole 11 when connected and to stop in that position when disconnected. As the driving tool 20 rotates, its outer peripheral edge (one of the longer horizontal ends) moves along the inner wall side surface 10a of the aquarium 10, and its lower edge moves along the inner wall bottom surface 10c of the aquarium 10. The formation of a groove 10b in the aquarium 10 and the downward slope of the inner wall bottom surface 10c toward the groove 10b make it easier for objects to be removed, such as SS, to be collected in the groove 10b. Generally, shrimp and other creatures tend to be found at the edges, and leftover food, droppings, dead individuals, shed shells, etc. tend to accumulate at the edges and tend to gather in the groove 10b along the inner wall side surface 10a. This makes it easier to clean the objects to be removed.

[0032] Figure 4 shows the configuration of the driving tool 20 in this embodiment. In this embodiment, since the bottom of the water tank 10 is not flat, the driving tool 20 has an outer shape that corresponds to the axial cross-sectional shape of the water tank 10. If the bottom of the water tank 10 were flat, the driving tool 20 would have a rectangular outer shape. The driving tool 20 in this embodiment includes a frame member 21 made up of a pair of frame members and a first passing screening member 22 (see Figure 7) that is insertable and detachable between the pair of frame members. The configuration of this frame member 21 will be described in detail below.

[0033] FIG. 5 shows a perspective view of the configuration of the frame member 21 of the driving tool 20 in this embodiment, and FIG. 6 shows the configuration of this frame member 21 as viewed from above.

[0034] As shown in these figures, the frame member 21 is made of a material that is resistant to rust even in seawater, such as stainless steel or a resin material, and is primarily composed of a pair of frame members spaced a predetermined distance (e.g., several centimeters) apart in the direction of movement. The frame member 21 is approximately 1 m high, and its horizontal length is approximately the radius of the water tank 10. A first passing sorting member 22 is removably inserted between the pair of frame members. Since the first passing sorting member 22 is removably inserted into the frame member 21, the desired type of first passing sorting member 22, with different gaps, can be freely selected, providing great convenience. The inner peripheral edge 21a of the frame member 21 is attached to the pole 11 via a connecting member 21b. The outer peripheral edge 21c is configured to move along the inner wall side surface 10a of the water tank 10, and the lower edge 21d is configured to move along the inner wall bottom surface 10c of the water tank 10. Brush members 21e that slide along the inner wall side surface 10a and inner wall bottom surface 10c of the water tub 10 are attached to the outer circumferential edge 21c and lower edge 21d of the frame member 21. By attaching such brush members 21e, the inner wall side surface 10a and inner wall bottom surface 10c of the water tub 10 can be cleaned, and the objects to be removed, including SS, in the water can be collected in the harvesting area 15. This reduces the labor required for cleaning.

[0035] FIG. 7 shows a schematic configuration example of the first passing screening member of the driving tool 20 in this embodiment.

[0036] As shown in the figure, in this configuration example, the first pass-through screening member 22 has multiple bar members 22b extending parallel to each other and connected at the upper and lower ends to an outer frame 22a. This first pass-through screening member 22 is made of a material that is resistant to rust even in seawater, such as stainless steel or a resin material. The gaps between the outer frame 22a and the bar members 22b, as well as the gaps between adjacent bar members 22b, are slightly smaller than the size (width) of the target to be harvested (the width of the thickest head part for shrimp, or the width of the thickest body part for fish) to prevent the passage of cultured objects larger than the size (width) to be harvested (the length (width) at which the target to be harvested cannot pass). As a mere example, if the size (width) of the target to be harvested is 10 mm, a slightly smaller gap would be a gap of 9 to 9.5 mm. While the bar members 22b are preferably made of round rods such as stainless steel, it is more preferable to use a round rod and a cylindrical resin member through which the round rod is inserted and which can rotate around the round rod, in order to avoid damaging the individual cultured targets to be harvested. In this configuration example, the gap between the outer frame 22a and the bar members 22b, as well as the gap between adjacent bar members 22b, are fixed. By selecting a first passing sorting member 22 with a gap slightly smaller than the size (width) of the cultured targets to be harvested and attaching it to the frame member 21, it is possible to prevent the passage of cultured targets larger than the desired size (width) and drive them into the harvesting area 15. Having a fixed gap as in this configuration example simplifies the structure of the first passing sorting member 22, facilitating operation and reducing production costs.

[0037] FIG. 8 shows a schematic diagram of another example of the configuration of the first passing screening member of the driving tool 20 in this embodiment.

[0038] As shown in the figure, in this configuration example, the first pass-through screening member 22' has a mesh member 22b' with a predetermined mesh size (corresponding to the gap of the present invention) mounted within an outer frame 22a'. This first pass-through screening member 22' is made of a resin material such as nylon, tetron, polyethylene, or highly reinforced polyester, which makes it resistant to rust in seawater and prevents damage to the cultivated objects. The mesh of the mesh member 22b' has gaps slightly smaller than the size (width) of the target to be harvested (the width of the widest head part for shrimp, or the width of the widest body part for fish) to prevent the passage of cultivated objects larger than the target size (the width) (the length (width) at which the target to be harvested cannot pass). As a mere example, if the size (width) of the target to be harvested is 10 mm, a slightly smaller gap would be a gap of 9 to 9.5 mm. This gap is fixed, and by selecting a first passing sorting member 22' with a mesh size appropriate for the size (width) of the cultivated objects to be harvested and attaching it to the frame member 21, it is possible to drive cultivated objects of a desired size (width) or larger into the harvesting area 15. As in this configuration example, the fixed gap simplifies the structure of the first passing sorting member 22', making operation easier and also reducing product costs.

[0039] FIG. 9 shows a schematic diagram of another example of the configuration of the first passing screening member of the driving tool 20 in this embodiment. In this example, the gap is variable. (A) in FIG. 9 shows the case where the gap is adjusted to be larger, and (B) in FIG. 9 shows the case where the gap is adjusted to be smaller. In this example, the gap can be adjusted within a range of 0.5 mm to 20 mm.

[0040] As shown in Figures 1A and 1B, in this configuration example, the first passing sorting member 22" has a plurality of bar members 22b" that extend parallel to each other and whose upper and lower ends are connected to an outer frame 22a" and an auxiliary frame 22c". A fine-mesh mesh member 22d" is provided over the entire surface between the auxiliary frame 22c" and the outer frame 22a" below it. This first passing sorting member 22" is made of a material that is resistant to rust even in seawater, such as stainless steel or a resin material. The gap between the outer frame 22 a" and the bar members 22 b" and the gap between adjacent bar members 22 b" are variably adjusted to be slightly smaller than the size (width) to be harvested (the narrowest length (width) that the cultured target to be harvested cannot pass through) in order to prevent the passage of cultured targets larger than the size to be harvested (the width of the thickest head part in the case of shrimp, or the width of the thickest body part in the case of fish). This is just one example, but if the size (width) of the cultured target to be harvested is 10 mm, a slightly smaller gap would be a gap of 9 to 9.5 mm. It is desirable that the bar members 22 b" be made of a round bar such as stainless steel, but it is more desirable to make the bar member from a round bar and a cylindrical body made of a resin material that has the round bar inserted therein and is rotatable around the round bar, from the viewpoint of not damaging the cultured target to be harvested. In this configuration example, the gap between the outer frame 22a" and the bar members 22b" and the gap between adjacent bar members 22b" are adjustable. The gap of the first passing sorting member 22" is adjusted according to the size (width) of the cultured objects to be harvested, and by attaching it to the frame member 21, it is possible to prevent the passage of cultured objects larger than the desired size (width) and drive them into the harvesting area 15. Note that when the gap is adjusted to be larger as in the same figure (A), some of the bar members 22b" that are not used for passing sorting are either moved to one end while remaining connected to the spacing adjustment members 22g" and 22h" (see Figure 10), or are detached from the outer frame 22a" and auxiliary frame 22c". As in this configuration example, the gap of the first passing sorting member 22" is adjustable, so that cultured objects of the desired size can be selected without replacing the first passing sorting member 22", making the operation easier.

[0041] Figure 10 explains an example of the gap adjustment structure of the first passing sorting member 22" of this embodiment, and Figure 10(A) shows the case where the gap d is adjusted to be larger, for example d = 15 mm, and Figure 10(B) shows the case where the gap d is adjusted to be smaller, for example d = 10 mm. Note that the gap adjustment structure of this first passing sorting member 22" is not limited to this example, and other known gap adjustment structures may be used.

[0042] In the gap adjustment structure shown in Figure 10, the upper and lower ends of bar member 22b" are guided by guide rails 22e" and 22f" attached to outer frame 22a" and auxiliary frame 22c", respectively, and can move linearly, and can be fixed in place with screws or the like. Furthermore, these bar members 22b" are connected to gap adjustment member 22g" below guide rail 22e" and to gap adjustment member 22h" above guide rail 22f". These gap adjustment members 22g" and 22h" are made of band members made of flexible material such as rubber. On gap adjustment members 22g" and 22h", flat metal fittings 22i" and 22j" having diagonally cut ends as shown are attached to the centers of adjacent bar members 22b".

[0043] As a result, when the flat fittings 22i" and 22j" are straightened as shown in Figure 1A, the gap d between the bar members 22b" becomes larger, and when the flat fittings 22i" and 22j" are bent so that the diagonally cut ends abut each other as shown in Figure 1B, the gap d between the bar members 22b" becomes smaller.

[0044] Figure 11 explains another example of the gap adjustment structure of the first passing sorting member 22" of this embodiment, and Figure 11(A) shows a case where the gap d is adjusted to be larger, for example, d = 15 mm, and Figure 11(B) shows a case where the gap d is adjusted to be smaller, for example, d = 10 mm. Note that the gap adjustment structure of this first passing sorting member 22" is not limited to this example, and various other gap adjustment structures may be used.

[0045] In the gap adjustment structure shown in Figure 11, the upper and lower ends of bar member 22b" are guided by guide rails 22e" and 22f" attached to outer frame 22a" and auxiliary frame 22c", respectively, so that they can move linearly and can be fixed in place with screws or the like. Furthermore, bar member 22b" is connected to flexible hose member 22k" which serves as a gap adjustment member below guide rail 22e", and to hose member 22l" made of a flexible material such as a rubber hose, which also serves as a gap adjustment member, above guide rail 22f". Hose members 22k" and 22l" are filled with air, and bar member 22b" is fixed in the desired position by tightening hose members 22k" and 22l" with fasteners 22m" and 22n" connected to bar member 22b". That is, depending on the connection positions of the bar member 22b" and the hose members 22k" and 22l", the gap d between the bar members 22b" can be increased as shown in FIG. 1(A), and the gap d between the bar members 22b" can be decreased as shown in FIG. 1(B).

[0046] FIG. 12 is a schematic exploded perspective view of the configuration of the lifting tool 23 in this embodiment, and FIG. 13 is a schematic exploded side view of the configuration of the lifting tool 23.

[0047] As shown in these figures, the lifting device 23 can move slowly up and down along the pole 11 and can also tilt slowly downward toward the inner wall surface 10a of the water tank 10. It also includes a support member 24, a sidewall member 25 placed on and fixed to the support member 24, and a second passing / screening member 26 placed on the sidewall member 25 and fixed as needed. As shown in Figure 13, four wires 27 connected to four electric or manual winches (not shown) are attached to the four corners of the support member 24. By controlling these winches, the lifting device 23 can move slowly up and down and can also tilt slowly downward toward the inner wall surface 10a of the water tank 10. The wires 27 are made of a material that is resistant to rust in seawater, such as stainless steel wire, and the winches are also rust-proofed.

[0048] FIG. 14 shows a schematic configuration of the support member 24 of the lifting tool 23 in this embodiment.

[0049] As shown in the figure, the support member 24 is a frame made of rods or pipes made of a material that is resistant to rust even in seawater, such as stainless steel. The support member 24 is configured to be movable along the pole 11 via a connecting member 24a provided at its inner peripheral end. A plurality of rotating hooks 24b are attached to the side ends of the support member 24 for fixing a side wall member 25 and (if necessary) a second passing screening member 26. These rotating hooks 24b are also made of a material that is resistant to rust even in seawater, such as stainless steel.

[0050] FIG. 15 shows a schematic configuration of the side wall member 25 of the lifting tool 23 in this embodiment.

[0051] As shown in the figure, the sidewall member 25 is a member for preventing the aquaculture target to be harvested from jumping out of the lifting tool 23, and is made of a material that is resistant to rust even in seawater, such as a resin material. In this embodiment, the sidewall member 25 has sidewalls 25a and 25b at both ends and a front wall 25c at the front end, which are fixed by a support 25d. The bottom surface is open and consists only of the support 25d. By providing this sidewall member 25, even if the aquaculture target jumps out during lifting, the sidewalls 25a and 25b and the front wall 25c prevent the aquaculture target from jumping out.

[0052] FIG. 16 shows a schematic configuration example of the second passing screening member 26 of the lifting tool 23 in this embodiment.

[0053] As shown in the figure, in this configuration example, the second pass-through screening member 26 has a mesh member 26b with a predetermined mesh size (corresponding to the gap of the present invention) mounted within an outer frame 26a. This second pass-through screening member 26 is made of a resin material such as nylon, tetron, polyethylene, or highly reinforced polyester, which makes it resistant to rust even in seawater and does not damage the cultured objects. The mesh of the mesh member 26b has gaps slightly smaller than the size (width) of the cultured objects to be harvested (the width of the thickest head part for shrimp, or the width of the thickest body part for fish) to prevent the passage of the cultured objects. As a mere example, if the size (width) of the cultured objects to be harvested is 10 mm, the slightly smaller gap would be a gap of 9 to 9.5 mm. This gap is fixed. By selecting the mesh size of the second passing sorting member 26 according to the size (width) of the cultivated object to be harvested, it is possible to pull up the cultivated object of a desired size (width) or larger. As in this configuration example, the fixed gap simplifies the structure of the second passing sorting member 26, making operation easier and reducing production costs.

[0054] Since the first passing sorting member of the driving tool 20 drives the culture targets of a desired size (width) or larger into the harvesting area 15, using this second passing sorting member 26 performs a double sorting process, allowing for more reliable sorting. Note that if the sorting by the first passing sorting member of the driving tool 20 is reliable and only culture targets of a desired size (width) or larger are driven into the harvesting area 15, the second passing sorting member 26 may be configured to use a fine-mesh net member 26b so that all culture targets are pulled up. In this case, the device configuration will be simpler.

[0055] 17 is a schematic diagram showing another example of the configuration of the second passing screening member of the lifting tool 23 in this embodiment. In this example, the gap between the bar members is fixed.

[0056] As shown in the figure, in this configuration example, the second pass-through screening member 26' has multiple bar members 26b' extending parallel to each other, with the upper and lower ends connected to an outer frame 26a'. This second pass-through screening member 26' is made of a material that is resistant to rust even in seawater, such as stainless steel or a resin material. The gaps between the outer frame 26a' and the bar members 26b', as well as the gaps between adjacent bar members 26b', are slightly smaller than the size (width) of the target to be harvested (the width of the thickest head part for shrimp, or the width of the thickest body part for fish) to prevent the passage of cultured objects larger than the size (width) to be harvested (the length (width) at which the target to be harvested cannot pass). As a mere example, if the size (width) of the target to be harvested is 10 mm, a slightly smaller gap would be a gap of 9 to 9.5 mm. While the bar members 26b' are preferably made of round rods such as stainless steel, it is more preferable to use a round rod and a resin cylinder through which the round rod is inserted and which can rotate around the round rod, in order to avoid damaging the individual aquaculture targets to be harvested. In this configuration example, the gap between the outer frame 26a' and the bar members 26b', as well as the gap between adjacent bar members 26b', are fixed. By selecting a second passing sorting member 26' with a gap slightly smaller than the size (width) of the aquaculture targets to be harvested, it is possible to pull up aquaculture targets of a desired size (width) or larger. Having a fixed gap, as in this configuration example, simplifies the structure of the second passing sorting member 26', facilitating operation and reducing production costs.

[0057] Since the first passing sorting member of the driving tool 20 drives the culture targets of a desired size (width) or larger into the harvesting area 15, using this second passing sorting member 26' performs a double sorting process, allowing for more reliable sorting. Note that if the sorting by the first passing sorting member of the driving tool 20 is reliable and only culture targets of a desired size (width) or larger are driven into the harvesting area 15, it is possible to use bar members 26b' with small gaps for the second passing sorting member 26' so that all culture targets are pulled up. In this case, the device configuration is simplified.

[0058] FIG. 18 shows another example of the configuration of the second passing sorting members of the lifting device 23 in this embodiment. In this example, the gap between the bar members is variable. (A) shows a case where the overall shape is a square with a narrow width, while (B) shows a case where the overall shape is a rectangle with a longer width. Because the harvesting area 15 is arc-shaped, two second passing sorting members 26" are placed side by side on the sidewall member 25, with the square one in (A) on the inner periphery and the rectangular one in (B) on the outer periphery. In this case, some of the culture targets will be missed due to the gaps around the two second passing sorting members 26" during lifting. However, by repeating the lifting operation from the harvesting area 15, it is possible to lift almost all of the culture targets. In this example, the gap can be adjusted within a range of 0.5 mm to 20 mm.

[0059] As shown in Figures 1A and 1B, in this configuration example, the second passing sorting member 26" has a plurality of bar members 26b" that extend parallel to each other and whose upper and lower ends are connected to an outer frame 26a". This second passing sorting member 26" is made of a material that is resistant to rust even in seawater, such as stainless steel or a resin material. The gap between outer frame 26a" and bar member 26b" and the gap between adjacent bar members 26b" are variably adjusted to be slightly smaller than the size (width) to be harvested (the narrowest length (width) that the cultured target to be harvested cannot pass through) in order to prevent the passage of cultured targets larger than the size to be harvested (the width of the thickest head part in the case of shrimp, or the width of the thickest body part in the case of fish). This is just one example, but if the size (width) of the cultured target to be harvested is 10 mm, a slightly smaller gap would be a gap of 9 to 9.5 mm. It is desirable that bar member 26b" be made of a round rod such as stainless steel, but it is more desirable to make it from a round rod and a cylindrical body made of a resin material that has the round rod inserted therethrough and is rotatable around the round rod, from the viewpoint of not damaging the cultured target to be harvested. In this configuration example, the gap between the outer frame 26a" and the bar members 26b" and the gap between adjacent bar members 26b" are adjustable, and by adjusting the gap of the second passing sorting member 26" so that it is slightly smaller than the size (width) of the culture target to be harvested, it is possible to pull up culture targets of a desired size (width) or larger. Because the gap of the second passing sorting member 26" is adjustable as in this configuration example, culture targets of a desired size can be selected without replacing the second passing sorting member 26", making work easier.

[0060] The gap adjusting structure of the second passing screening member 26'' is similar to the structure shown in FIG. 10 or 11 or other structures.

[0061] 19 shows the operation of the harvesting device of this embodiment. The harvesting operation will be explained below with reference to this figure.

[0062] First, the lifting tool 23 is placed at the bottom of the harvesting area 15 of the aquarium. In this state, the two driving tools 20 are slowly (at low speed) rotated in opposite directions relative to the pole 11, and the two tools are moved so as to slowly sandwich the harvesting area 15 from both sides. When the driving tools 20 rotate in only one direction, one of the driving tools 20 is slowly (at low speed) rotated and stopped at the leading end of the harvesting area 15, and in this state, the lifting tool 23 is placed at the bottom of the harvesting area 15, and then the other driving tool 20 is slowly (at low speed) rotated to the rear end of the harvesting area 15. In this way, the first passing sorting member 22 of the driving tools 20 drives the culture target (shrimp, fish, etc.) of the set size into the harvesting area 15. Next, with the harvesting area 15 sandwiched between the two driving tools 20 and the inner wall side surface 10a, the lifting tool 23 is moved upward slowly (at a low speed), and then the tip of the lifting tool 23 is tilted downward slowly (at a low speed), causing the cultured object (shrimp, fish, etc.) to slide and be dropped into a container such as a trout box outside the tank for harvesting.

[0063] As described above in detail, the harvesting device of this embodiment is provided with a driving tool 20 for driving the cultured targets, such as shrimp and fish, in the aquarium 10 into the harvesting area 15, and a lifting tool 23 for lifting the cultured targets from the harvesting area 15. Harvesting is performed in a two-stage process: the driving tool 20 moves slowly (at a low speed) to drive the cultured targets into the harvesting area 15, and the lifting tool 23 slowly (at a low speed) lifts the cultured targets from the harvesting area 15. This prevents damage to the cultured targets. Furthermore, since a large amount of cultured targets can be harvested efficiently, the labor load can be significantly reduced. Furthermore, because the driving tool 20 is provided with a first passing sorting member 22 with a gap slightly smaller than the size (width) of the cultured targets to be harvested, only those cultured targets of a desired size (width) or larger can be selectively harvested from a large amount of cultured targets. Furthermore, because the cultured targets driven into the harvesting area 15 by the driving tool 20 are pulled up by the pulling tool 23, it is possible to reliably select and efficiently harvest cultured targets of a desired size (width) or larger without damaging them. If the pulling tool 23 is also provided with a second passing sorting member 26 having a gap slightly smaller than the size (width) of the cultured targets to be harvested, a double sorting process is performed, allowing for more reliable selection. The first passing sorting member 22 and the second passing sorting member 26 can be those having multiple bar members with fixed gaps or those having net members with fixed gaps, or those having multiple bar members with variable gaps. This allows for easy and reliable sorting and harvesting of cultured targets of a desired size without damaging them. The driving tool 20 has brush members 21e on its outer periphery and lower edge that slide along the inner wall side surface 10a and inner wall bottom surface 10c of the tank 10, allowing it to clean the inner wall side surface 10a and inner wall bottom surface 10c and collect the materials to be removed, including SS, in the harvesting area 15. It is desirable to slowly rotate the driving tool 20 in the tank 10 to agitate the culture water, thereby keeping the culture water constantly moving. This prevents the culture water from becoming an anaerobic environment.

[0064] 20 is a schematic diagram showing the overall configuration of a land-based aquaculture facility according to another embodiment of the present invention. This embodiment is a harvesting device for a tank having a rectangular parallelepiped inner wall.

[0065] In the figure, reference numeral 110 denotes a rectangular parallelepiped tank containing aquaculture water for land-based aquaculture of fish, shrimp, and other aquaculture targets, along with the aquaculture targets. The tank 110 has concrete walls, and a harvesting area 115 for harvesting the aquaculture targets is defined within the tank. A single driving tool 120 is configured to be movable so as to slowly drive the aquaculture targets into the aquaculture area 115, and a lifting tool 123 is configured to slowly lift the aquaculture targets driven into the harvesting area 115 and place them into a container or another tank located outside the tank 110. The driving tool 120 is suspended and fixed to a hanging device 128. The hanging device 128 is equipped with running wheels and is configured to be movable along the wall of the tank 110 along the long side of the tank 110.

[0066] The driving tool 120 is formed in a rectangular shape with a horizontal length approximately equal to the length of the short side of the tank 110 and a height of approximately 1 m. When the hanging device 128 moves, the horizontal edges of the driving tool 120 move along the inner side wall 110a of the tank 110, and the lower edge moves along the inner bottom wall 110c of the tank 110. As one driving tool 120 moves, the aquaculture target is driven into the harvesting area 115 sandwiched between the driving tool 120 and the inner side wall 110a of the tank 110. Brush members 121e that slide along the inner side wall 110a and inner bottom wall 110c of the tank 110 are attached to the horizontal and lower edges of the driving tool 120. By attaching the brush member 121e, it is possible to clean the inner wall side surface 110a and the inner wall bottom surface 110c of the water tank 110, and also to collect the objects to be removed, including SS, in the water in the harvesting area 115. This reduces the labor required for cleaning.

[0067] The lifting device 123 is configured to be movable up and down within the culture area 115 and also to be tiltable downward toward the inner wall side surface 110 a of the aquarium 110 .

[0068] As shown in FIG. 20 , four wires 129 are attached to the four corners of the driving tool 120, and these wires 129 are connected to four electric or manual winches (not shown) via pulleys (not shown). By controlling the winches, the driving tool 120 and the suspending device 128 can be moved slowly along the inner wall side 110a of the water tank 110. Similarly to the embodiment in FIG. 1 , a wire 127 and a winch (not shown) are connected to the lifting tool 123. By controlling these winches, the lifting tool 123 can be moved slowly up and down and can also be tilted slowly downward toward the inner wall side 110a of the water tank 110. Four wires (not shown) are attached to the driving tool 120 at the four corners opposite the wires 129, and these wires are connected to pulleys (not shown) and four electric or manual winches (not shown). This allows the driving tool 120 to move in the opposite direction.

[0069] The detailed configuration, effects, and modifications of the driving tool 120 and the lifting tool 123 are the same as those in the embodiment of FIG. 1, and therefore will not be described here.

[0070] FIG. 21 is a schematic diagram showing an example of the configuration of a frame member and a first passing screening member of a driving tool in still another embodiment of the present invention.

[0071] In this embodiment, a water tank with a flat bottom is used, and therefore the outer shape of the driving tool is rectangular. As shown in the figure, the driving tool is equipped with a frame member 221 having a rectangular outer shape made of frame materials and a first passing screening member 222 having a rectangular outer shape that can be inserted and removed between the frame members.

[0072] The frame member 221 is made of a material that is resistant to rust even in seawater, such as stainless steel or a resin material, and is primarily composed of a pair of frame members spaced apart a predetermined distance (e.g., several centimeters) in the direction of movement. The frame member 221 is approximately 1 m high, and its horizontal length is approximately the radius of the tank. Three first passing sorting members 222 are removably inserted between the pair of frame members. Because the first passing sorting members 222 are removably inserted into the frame member 221, desired types of first passing sorting members, members with different gaps, etc., can be freely selected, providing great convenience. The inner peripheral edge 221a of the frame member 221 is attached to the pole 211 via a connecting member 221b. The outer peripheral edge 221c is configured to move along the side surface of the inner wall of the tank (not shown), and the lower edge 221d is configured to move along the bottom surface of the inner wall of the tank. As in the embodiment shown in Figure 1, brush members that slide along the inner side and bottom surfaces of the tank are attached to the outer circumferential edge 221c and lower edge 221d of the frame member 221. By attaching such brush members, the inner side and bottom surfaces of the tank can be cleaned and the target material for removal, including SS, in the water can be collected in the harvesting area, thereby reducing the labor required for cleaning.

[0073] The first pass-through screening member 222 has a mesh member 222b with a predetermined mesh size (corresponding to the gap of the present invention) mounted within its outer frame 222a. This first pass-through screening member 222 is made of a resin material such as nylon, tetron, polyethylene, or highly reinforced polyester, which makes it resistant to rust in seawater and prevents damage to the cultured objects. The mesh of the mesh member 222b has gaps slightly smaller than the size (width) of the cultured objects to be harvested (the width of the widest head part for shrimp, or the width of the widest body part for fish) to prevent the passage of the cultured objects. As a mere example, if the size (width) of the cultured objects to be harvested is 10 mm, a slightly smaller gap would be 9 to 9.5 mm. This gap is fixed, and by selecting a first passing sorting member 222 with a mesh size appropriate for the size (width) of the cultivated target to be harvested and attaching it to the frame member 221, it is possible to drive cultivated targets of a desired size (width) or larger into the harvesting area. As in this configuration example, the fixed gap simplifies the structure of the first passing sorting member 222, making operation easier and also reducing product costs.

[0074] The detailed configuration, effects, and modifications of this embodiment are the same as those of the embodiment shown in FIG. 1, and therefore will not be described here.

[0075] FIG. 22 shows a schematic configuration example of the mesh member 222b of the first passing screening member 222 of the driving tool 221 in this embodiment.

[0076] As shown in Fig. 1A, the mesh member 222b1 of the first passing sorting member 222 is made up of a single commercially available net with a fixed mesh size. A net with a mesh size corresponding to the size (width) of the cultivated target to be harvested is attached inside the outer frame 222a, and the net is replaced when the mesh size needs to be changed.

[0077] As shown in Fig. 1B, the mesh member 222b2 of the first passing screening member 222 is constructed by stacking two meshes with the same mesh size and mounting them in the outer frame 222a with a horizontal offset. The meshes are rectangular in shape, elongated in the vertical direction. This allows the production of mesh members 222b2 with mesh sizes that are not commercially available.

[0078] As shown in Fig. 1C, the mesh member 222b3 of the first passing sorting member 222 is constructed by overlapping two nets with different mesh sizes and mounting them inside the outer frame 222a. Because the mesh has a pattern, there are mesh sections through which the culture target can pass and mesh sections through which the culture target cannot pass.

[0079] Figure 23 shows a schematic diagram of a driving tool according to yet another embodiment of the present invention. In this example, the gap is manually adjustable. Figure 23(A) shows the overall configuration, Figure 23(B) shows the case where the gap is adjusted to be larger, and Figure 23(C) shows the case where the gap is adjusted to be smaller.

[0080] As shown in FIG. 1A, in this configuration example, the first pass-through sorting member 322 is configured such that the first outer frame 322a1 and the second outer frame 322a2 are overlapping and can slide laterally relative to each other. The first outer frame 322a1 and the second outer frame 322a2 are each provided with a mesh member 322d having the same mesh size over their entire surfaces. The first pass-through sorting member 322 is made of a material that is resistant to rust even in seawater, such as stainless steel or a resin material. By sliding the first outer frame 322a1 and the second outer frame 322a2 laterally relative to each other while overlapping each other and fixing them in a desired position, the gap between the first pass-through sorting member 322 can be widened as shown in FIG. 1B or narrowed as shown in FIG. 1C. That is, to prevent the passage of cultured objects larger than the size to be harvested (the width of the thickest head portion for shrimp, or the width of the thickest body portion for fish), the gap is variably adjusted to a size (width) slightly smaller than the size (width) to be harvested (the narrowest length (width) at which the cultured objects to be harvested cannot pass). As a mere example, if the size (width) of the cultured objects to be harvested is 10 mm, a slightly smaller gap would be a gap of 9 to 9.5 mm. In this configuration example, the gap of the first passing sorting member 322 is adjusted according to the size (width) of the cultured objects to be harvested, preventing the passage of cultured objects larger than the desired size (width) and driving them into the harvest area. Because the gap of the first passing sorting member 322 is adjustable by sliding the first outer frame 322a1 and the second outer frame 322a2 laterally relative to each other, cultured objects of the desired size can be selected without replacing the first passing sorting member 322, making the operation easier. Furthermore, since it is a slide mechanism, the structure is simple and any desired gap can be easily set.

[0081] FIG. 24 illustrates an example of a gap adjustment structure of the first passing screening member in yet another embodiment of the present invention.

[0082] In this gap adjustment structure, as shown in FIG. 1A, multiple rotating flat plate members 422b, each having a strip shape (vertically elongated rectangular shape) extending in the vertical direction (up and down), are provided to be rotatable about their vertical rotation shafts 422b1. Both upper corners of the rotating flat plate members 422b are pivotally attached to a pair of operation bars 422h, and both lower corners of the rotating flat plate members 422b are pivotally attached to a pair of operation bars 422i. As a result, when the pair of operation bars 422h and 422i move axially in opposite directions as indicated by the arrows, each of the multiple rotating flat plate members 422b rotates about the rotation shafts 422b1 to a desired angular position. This allows the gap between adjacent rotating flat plate members 422b to be adjusted to the desired gap.

[0083] For example, as shown in Figure 1(B), when multiple rotating flat plate members 422b are rotated to be in the same plane (lined up horizontally in the figure), the gap between the rotating flat plate members 422b is smallest; when multiple rotating flat plate members 422b are rotated to be in an inclined plane (lined up diagonally in the figure) as shown in Figure 1(C), the gap between the rotating flat plate members 422b is medium; and when multiple rotating flat plate members 422b are rotated to be in a parallel plane state (lined up vertically in the figure) as shown in Figure 1(D), the gap between the rotating flat plate members 422b is largest.

[0084] The gap adjustment structure of the first passing screening member is not limited to the example shown in FIG. 24, and various other gap adjustment structures may be used.

[0085] In the field of aquaculture, partial harvesting (gradual harvesting / shipping) is expected to become increasingly important in the future in order to increase production. It has been discovered that in aquaculture, growth rates vary depending on the size of the individual, and that larger individuals form territories, preventing smaller individuals from reaching food. This leads to a population structure that mimics the laws of nature: 20% large, 60% medium-sized, and 20% small (Pareto principle). It has also been discovered that removing larger individuals from the tank results in a 2:6:2 ratio of the remaining individuals. In partial harvesting, the largest individuals (20%) are removed, followed by the next largest (20%), and then the next largest (20%), and so on. This process, in which the largest 20% are shipped and the next largest 20% are born, ultimately results in the highest survival rate and the highest yield. When carrying out such partial harvesting, the present invention is effective and may become a key technology for maintaining a high level of harvest yield. That is, by installing the harvesting device of the present invention in each aquaculture tank, it becomes possible to easily select and remove large individuals.

[0086] The above-described embodiments are merely illustrative of the present invention and are not limiting, and the present invention can be embodied in various other modified and altered forms. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

[0087] The present invention is applicable to land-based aquaculture facilities, such as closed recirculating land-based aquaculture systems (RAS), as well as marine aquaculture facilities and coastal aquaculture facilities other than land-based aquaculture facilities.

[0088] 10, 110 Water tank 10a, 110a Inner wall side surface 10b Groove 10c, 110c Inner wall bottom surface 11 Pole 12 Support arm 13 Support 14 Pier 15, 115 Harvesting area 20, 120 Driving tool 21, 221 Frame member 21a, 221a Inner peripheral edge 21b, 24a, 221b Connecting member 21c, 221c Outer peripheral edge 21d, 221d Lower edge 21e, 121e Brush member 22, 22', 22", 222, 322 First passing sorting member 22a, 22a', 22a", 26a, 26a', 26a" Outer frame 22b, 22b", 26b', 26b" Bar member 22b', 22d", 26b, 222b, 222b1, 222b2, 222b3, 322d Mesh member 22c" Auxiliary frame 22e", 22f" Guide rail 22g", 22h" Spacing adjustment member 22i", 22j" Flat metal fittings 22k", 22l" Hose member 22m", 22n" Fastening metal fittings 23, 123 Lifting tool 24 Support member 24b Rotating hook 25 Side wall member 25a, 25b Side wall 25c Front wall 25d Support body 26, 26', 26" Second passing screening member 27, 127, 129 Wire 128 Hanging device 322a1 First outer frame 322a2 Second outer frame 422b Rotating flat plate member 422b1 Rotating shaft 422h, 422i Operation bar

Claims

1. A harvesting device for an aquaculture facility comprising: a tank for housing the culture targets; one or two driving tools having an outer shape corresponding to the cross-sectional shape of the inner wall side and bottom of the tank and movable to drive the culture targets into a harvesting area; and a lifting tool for lifting the culture targets in the harvesting area surrounded by the one driving tool and the inner wall side or in the harvesting area surrounded by the two driving tools and the inner wall side, wherein the driving tool has a first passing sorting member having a gap slightly smaller than the size to be harvested in order to prevent the passage of culture targets larger than the size to be harvested, and the lifting tool has a support member that is movable in the vertical direction and can be tilted downward toward the inner wall side of the tank, and a lifting member that is supported by the support member and lifts the culture targets in the harvesting area.

2. The harvesting device of the aquaculture facility according to claim 1, characterized in that the lifting member is configured to lift all of the aquaculture targets within the harvesting area.

3. A harvesting device for an aquaculture facility as described in claim 1, characterized in that the lifting member is provided with a second passing screening member having a gap slightly smaller than the size to be harvested to prevent the passage of cultured objects larger than the size to be harvested.

4. A harvesting device for an aquaculture facility as described in claim 3, characterized in that the first passing sorting member or the second passing sorting member has a plurality of bar members extending parallel to each other, and adjacent bar members have the gap.

5. The harvesting device for an aquaculture facility according to claim 4, characterized in that the gaps between the plurality of bar members are configured to be adjustable.

6. The harvesting device of an aquaculture facility according to claim 4, characterized in that the gaps between the plurality of bar members are fixed.

7. A harvesting device for an aquaculture facility described in any one of claims 4 to 6, characterized in that each of the multiple bar members has a round rod body and a cylindrical body through which the round rod body is inserted and which can rotate around the round rod body.

8. A harvesting device for an aquaculture facility as described in claim 3, characterized in that the first passing sorting member or the second passing sorting member is a net member having a mesh size of a predetermined size.

9. A harvesting device for an aquaculture facility as described in claim 1, characterized in that the first passing sorting member has a first outer frame member and a second outer frame member each provided with a mesh member over their entire surface, and the first outer frame member and the second outer frame member are overlapping each other and can slide relatively.

10. The harvesting device for the aquaculture facility described in claim 1, characterized in that the driving tool further comprises a frame member having a pair of frame members whose outer peripheral edge moves along the inner wall side and bottom surfaces of the tank and is spaced a predetermined distance apart in the direction of movement, and the first passing sorting member is insertable and detachable between the pair of frame members.

11. A harvesting device for an aquaculture facility as described in claim 10, characterized in that the frame member of the driving tool has brush members on its outer periphery and lower edge, respectively, which slide along the inner wall side and bottom surfaces of the tank.

12. The harvesting device for an aquaculture facility according to claim 1, characterized in that the lifting tool has a side wall member for preventing the aquaculture target to be harvested from jumping out.

13. The harvesting device for an aquaculture facility as described in claim 1, characterized in that the tank has a groove formed along the inner wall side and an inner wall bottom surface that slopes downward toward the groove.

14. A harvesting device for an aquaculture facility as described in claim 1, characterized in that the tank is a cylindrical tank having an inner wall with a rotatable pole in the center, and one end of the driving tool is connected to the pole and is configured to be rotatable around the pole.

15. The harvesting device for an aquaculture facility as described in claim 1, characterized in that the tank has an inner wall of a rectangular parallelepiped shape, and one end of the driving tool can be connected to a linear movement member that can move along the side of the tank.

Images