Land-based aquaculture apparatus

Abstract

To provide a land-based aquaculture apparatus capable of improving an aquaculture environment and increasing an aquaculture production quantity.SOLUTION: A land-based aquaculture apparatus includes an aquaculture tank 11 that accommodates an aquaculture target body F, and a flow-generating pump 12 that generates a laminar flow in a fluid within the aquaculture tank 11. Accordingly, a flow velocity of the fluid discharged from a discharge part 18 of the flow-generating pump 12 becomes substantially uniform in speed and direction from a central portion of the discharge part to an end portion (outer peripheral end portion) of the discharge part, thereby forming the laminar flow. As a result, the aquaculture target bodies F in the aquaculture tank 11 can swim while being uniformly distributed in a left-right direction (a direction orthogonal to a water flow) and a vertical direction (vertical direction of the aquaculture tank), thereby improving aquaculture density and increasing an aquaculture production quantity.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a land-based aquaculture device for cultivating organisms such as fish on land. [Background technology]

[0002] In recent years, aquaculture has been conducted on land, separate from marine aquaculture. Land-based aquaculture involves the establishment of tanks on land, and thorough management of the water quality in these tanks allows for high-density farming. Furthermore, compared to marine aquaculture, land-based aquaculture has the advantage of easier feeding management and superior durability of the facilities. There are two types of land-based aquaculture: free-flowing and closed-circulation. In the free-flowing system, rearing water is continuously drawn in from the sea, while in the closed-circulation system, the rearing water is purified using water treatment equipment and recycled. The closed-circulation system has the advantage that it can be installed inland and is not limited in terms of location, and that the rearing environment can be artificially managed, resulting in rapid growth (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-40950 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional closed-circulation land-based aquaculture equipment, fluid (e.g., water) is circulated within the aquaculture tank using a fluid pump such as an impeller pump. With a typical impeller pump, the flow rate of water discharged from the discharge hole is greatest at the center of the hole and approaches zero at the edge (peripheral edge) of the hole. This causes turbulence in the water flow discharged from the discharge hole, resulting in a non-uniform flow direction. As a result, the aquaculture target organisms (e.g., fish) in the aquaculture tank tend to crowd together in the tangential direction of the center of the discharge hole, reducing the aquaculture density. Furthermore, the turbulence causes non-uniform flow direction and magnitude, making it impossible to uniformly distribute the exercise load on the fish. This resulted in a poor aquaculture environment for the cultivated organisms, and as a result a lack of growth in aquaculture production.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a land-based aquaculture device that can improve the aquaculture environment and increase aquaculture production. [Means for solving the problem]

[0006] In order to achieve the above object, the land-based aquaculture device of the present invention is a closed circulation type land-based aquaculture device, a culture tank for accommodating the cultured organisms; and a flow pump that generates a laminar flow in the fluid in the aquaculture tank.

[0007] Here, the flow pump may be a laminar flow pump that can generate a laminar flow by itself, or a pump that can generate a laminar flow by using multiple flow pumps.Also, a laminar flow may be generated by using multiple laminar flow pumps.

[0008] In the present invention, a starter pump is provided to generate laminar flow in the fluid in the culture tank, so the flow rate of the fluid (e.g., water) discharged from the discharge port of the starter pump is approximately equal in speed and direction from the center of the port to the edge (peripheral edge) of the port, resulting in laminar flow. As a result, the cultured organisms (e.g., fish) in the culture tank can swim evenly in both the left-right direction (perpendicular to the water flow) and the up-down direction (up-down direction of the culture tank), improving the culture density. Furthermore, laminar flow makes the direction and magnitude of the fluid flow rate uniform, making it possible to equalize the movement load on the cultured organisms. This improves the aquaculture environment for the cultured organisms, resulting in increased aquaculture production.

[0009] In the above-described configuration of the present invention, a heat insulating material may be provided on the outer surface of the aquaculture tank so as to cover the outer surface.

[0010] With this configuration, the heat insulating material can easily suppress temperature rises and falls of the fluid in the culture tank, making it easy to maintain a constant temperature.

[0011] In addition, in the above-mentioned configuration of the present invention, a separator plate is provided to separate the inside of the aquaculture tank into upper and lower sections, The fluid can be circulated between the upper tank above the separator and the lower tank below the separator by the pump. The cultured organisms are contained in the upper tank, The flow pump may be disposed in the lower tank.

[0012] With this configuration, a laminar flow pump circulates fluid between the upper tank above the separator and the lower tank below, but the cultured organisms spread evenly in the upper tank and swim in one direction, making it easy to observe the culture status of the organisms. Furthermore, since the upflow pump is disposed in the lower tank, the cultured organisms housed in the upper tank will not collide with the upflow pump, preventing damage to the cultured organisms and the upflow pump.

[0013] In the above-described configuration of the present invention, one or more of the flow-inducing pumps may be provided.

[0014] According to this configuration, by generating a laminar flow in the fluid in the culture tank using one or more starter pumps, it is possible to easily culture the cultured organisms even if the culture tank is large.

[0015] In the above-described configuration of the present invention, the laminar flow generated by the plurality of flow pumps may flow in one direction in the upper tank and in another direction opposite to the one direction in the lower tank.

[0016] With this configuration, laminar flow flows in one direction in the upper tank and in the other direction in the lower tank, so that the fluid flows in a circulating laminar flow between the upper and lower tanks, allowing the cultured organisms to be efficiently cultivated in the upper tank.

[0017] Furthermore, in the above-described configuration of the present invention, when the distance between the bottom surface of the lower tank and the separator is H1 and the distance between the separator and the top surface of the fluid in the upper tank is H2, H2 may be greater than or equal to H1.

[0018] With this configuration, H2≧H1, and the depth of the fluid in the upper tank is greater than or equal to the depth of the fluid in the lower tank, so the number of cultured organisms that can be housed in the upper tank can be increased, thereby increasing the number of cultured organisms.

[0019] In the above-described configuration of the present invention, H1 may be higher than the vertical height of the flow pump.

[0020] With this configuration, the starter pump can be reliably disposed in the lower tank without interfering with the separator plate.

[0021] In the above-described configuration of the present invention, a pair of openings for circulating a fluid between the upper tank and the lower tank are provided between the separator and an inner wall surface of the aquaculture tank, The opening is provided at a position perpendicular to the flow direction of the fluid, and does not necessarily have to be provided at a position parallel to the flow direction of the fluid.

[0022] With this configuration, the pair of openings are located at positions perpendicular to the flow direction of the fluid, and are not located at positions parallel to the flow direction, so that the fluid can be easily and efficiently circulated between the upper tank and the lower tank through the pair of openings.

[0023] In the above-described configuration of the present invention, one of the pair of openings is an upstream opening provided on the upstream side of the upper tank in the flow direction of the fluid, and the other opening is a downstream opening provided on the downstream side of the flow direction of the fluid, The flow pump may be provided below the downstream opening.

[0024] With this configuration, the flow pump is provided below the downstream opening, so that the fluid flowing from upstream to downstream in the upper tank can be easily and reliably made to flow into the lower tank.

[0025] In the above-described configuration of the present invention, when the opening area of ​​the upstream opening is A1 and the opening area of ​​the downstream opening is A2, A1≧A2 may be satisfied.

[0026] With this configuration, A1 ≧ A2. The flow rate of the fluid flowing through the opening is the flow rate × area, and since the flow rates are equal at the upstream opening and the downstream opening, the flow rate of the fluid at the upstream opening is lower than the flow rate of the fluid at the downstream opening. As a result, the flow of the fluid is gentler on the upstream side than on the downstream side. Furthermore, since A1 ≧ A2, backflow of the fluid from the downstream opening is prevented.

[0027] In the above-described configuration of the present invention, the upstream opening and the downstream opening may each be formed to have a substantially rectangular, oval, or elliptical shape in plan view.

[0028] With this configuration, the upstream opening and the downstream opening can be made to have appropriate shapes in plan view. [Effects of the Invention]

[0029] According to the present invention, the aquaculture environment can be improved and aquaculture production can be increased. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a side cross-sectional view showing a general configuration of a land-based aquaculture device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view showing the schematic configuration of the land-based aquaculture device of the same embodiment. [Figure 3] FIG. [Figure 4] FIG. [Figure 5]FIG. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, an embodiment of the land-based aquaculture device according to the present invention will be described with reference to the drawings. FIG. 1 is a side cross-sectional view showing the schematic configuration of the land-based aquaculture device of this embodiment, and FIG. 2 is a plan view showing the schematic configuration of the same land-based aquaculture device. 1 and 2, the thick arrows indicate the direction of flow of a fluid such as water.

[0032] As shown in Figures 1 and 2, the land-based aquaculture device 10 of this embodiment is a closed-circulation land-based aquaculture device, and is equipped with a culture tank 11 that houses the cultured organisms F, and a flow pump 12 that is capable of generating a laminar flow in the fluid in the culture tank 11. The aquaculture tank 11 is formed in the shape of a rectangular parallelepiped box that is elongated from side to side and is open at the top. Furthermore, a heat insulating material 13 is provided on the outer surface of the aquaculture tank 11 so as to cover the outer surface. The heat insulating material 13 is composed of a plurality of heat insulating material pieces 13a, 13b, and 13c. The heat insulating material piece 13a is formed in the shape of a rectangular plate and is provided on opposing side end surfaces of the aquaculture tank 11 so as to cover the side end surfaces. The heat insulating material piece 13b is formed in the shape of a rectangular plate and is provided on opposing side surfaces of the bathtub 11 so as to cover the side surfaces. The heat insulating material piece 13c is formed in the shape of a rectangular plate and is provided on the bottom surface of the aquaculture tank 11 so as to cover the bottom surface.

[0033] The flow pump 12 is a laminar flow pump 12 that can generate a laminar flow by itself. As shown in Figures 3 and 4, the laminar flow pump 12 comprises a casing 15, a motor 16 housed in the casing 15, an impeller 17 attached to the rotating shaft of the motor 16, and a discharge section 18 provided at the tip opening of the casing 15.

[0034] The casing 15 is formed in a substantially cylindrical shape, and has a plurality of intake ports 15a formed on its outer circumferential surface. The intake ports 15a are rectangular openings for drawing fluid such as water into the casing 15, and a plurality of intake ports 15a are formed at predetermined intervals in the circumferential and axial directions of the casing 15. Motor 16 is a DC brushless motor, and its rotating shaft is arranged coaxially with casing 15, with the tip of the rotating shaft facing discharge section 18. Motor 16 is attached to a mounting base 16a, which is fixed to the base end of casing 15 (the right end in FIGS. 3 and 4). The impeller 17 is attached to the rotary shaft of the motor 16, and is disposed inside the inner circumferential surface 15b of the tip end portion of the casing 15 (the left end portion in FIGS. 3 and 4). 5, a plurality of cylindrical walls 18a are concentrically provided inside the discharge portion 18 at predetermined intervals in the radial direction, and radial walls 18b are provided extending radially from the center toward the outermost cylindrical wall 18a, with the radial walls 18b inclined at a predetermined angle with respect to the axis of the casing 15. The cylindrical walls 18a and the radial walls 18b rectify the fluid (liquid) flowing from the impeller 17, so that the fluid (liquid) discharged from the discharge portion 18 becomes a laminar flow.

[0035] In the laminar flow pump 12 configured as described above, when the impeller 17 is rotated by the motor 16, fluid such as water around the laminar flow pump 12 is drawn into the casing 15 through the suction port 15a, and the fluid flows toward the discharge portion 18 and is discharged to the outside from the discharge portion 18. At this time, the fluid drawn into the casing 15 is discharged from the discharge portion 18 as a laminar flow due to the mutual mixing action between the impeller 17 and the cylindrical wall 18a and radial wall 18b of the discharge portion 18. Laminar flow can be achieved by optimally designing the shapes of the impeller 17, casing 15, and discharge portion 18.

[0036] 1, a separator plate 20 is provided in the aquaculture tank 11. The separator plate 20 separates the inside of the aquaculture tank 11 into upper and lower sections, is formed in a rectangular plate shape, and is disposed parallel to the bottom surface of the aquaculture tank 11. The long sides of the separator plate 20 are in watertight contact with the inner surface of the aquaculture tank 11 along the longitudinal direction, while the short sides are spaced apart from the inner surface of the aquaculture tank 11 along the lateral direction. Fluid can be circulated between an upper tank 21 above the separator 20 and a lower tank 22 below by a laminar flow pump 12. The upper tank 21 contains the culture target organisms F, and the lower tank 22 has the laminar flow pump 12 disposed therein. Furthermore, if the distance between the bottom surface of the lower tank 22 and the separator 20 is H1 and the distance between the separator 20 and the upper surface of the fluid in the upper tank 21 is H2, then H2 ≧ H1. Specifically, in this embodiment, in order to obtain a larger amount of culture target organisms F, H2:H1 = 2:1. In other words, the upper tank 21 is twice as deep as the lower tank 22.

[0037] Furthermore, a pair of openings 25, 26 for circulating a fluid between the upper tank 21 and the lower tank 22 is provided between the separator 20 and the inner wall surface of the aquaculture tank 11 (the inner surface along the lateral direction of the aquaculture tank 11). The pair of openings 25, 26 are provided at positions perpendicular to the fluid flow direction, and are not provided parallel to the fluid flow direction. In other words, the length of the separator 20 (the length in the left-right direction in FIGS. 1 and 2) is shorter than the distance between the two inner surfaces along the lateral direction of the aquaculture tank 11, and the width of the separator 20 is equal to the distance between the two inner surfaces along the longitudinal direction of the aquaculture tank 11. Therefore, the opening 25 is provided at one end of the separator 20 in the longitudinal direction, the opening 26 is provided at the other end, and no openings are provided parallel to the fluid flow direction.

[0038] Of the pair of openings 25, 26, one opening 25 is an upstream opening 25 provided on the upstream side of the fluid flow direction in the upper tank 21, and the other opening 26 is a downstream opening 26 provided on the downstream side of the fluid flow direction. As shown in FIG. 2, the upstream opening 25 and the downstream opening 26 are each formed to have a substantially rectangular shape in plan view. In the lower tank 22, two laminar flow pumps 12, 12 are provided below the downstream opening 26. As shown in Fig. 2, the laminar flow pumps 12, 12 are arranged spaced apart in the width direction of the aquaculture tank 11 below the downstream opening 26 in a plan view. If the width of the aquaculture tank 11 is narrow, one laminar flow pump 12 may be provided, but if the width is wider than that shown in Fig. 2, three or more laminar flow pumps 12 may be provided. 1, the distance H1 between the bottom surface of the lower tank 22 and the separator 20 is greater than the vertical height of the laminar flow pump 12. As a result, the laminar flow pump 12 is disposed in the lower tank 22 without protruding upward from the downstream opening 26.

[0039] In addition, lattice plates 27 are attached to the upstream opening 25 and the downstream opening 26, allowing fluid to flow through but preventing the cultured organisms F from passing through.This allows fluid to circulate between the upper tank 21 and the lower tank 22 as a laminar flow using the laminar flow pumps 12, 12, but prevents the cultured organisms F from flowing from the upper tank 21 into the lower tank 22. Furthermore, if the opening area of ​​the upstream opening 25 is A1 and the opening area of ​​the downstream opening 26 is A2, then A1 ≥ A2 holds. In other words, the opening area of ​​the upstream opening 25 is equal to or larger than that of the downstream opening 26. The laminar flow generated by the multiple (two) laminar flow pumps 12 flows in one direction (rightward in FIG. 1) in the upper tank 21 and in the other direction opposite to the one direction (leftward in FIG. 1) in the lower tank 22.

[0040] In addition, in the land-based aquaculture device of this embodiment, fluid such as water in the aquaculture tank 11 is circulated between the aquaculture tank 11 and the filtration tank 31. That is, as shown in Figure 1, the filtration tank 31 is positioned below the aquaculture tank 11, and as shown in Figure 2, it is positioned offset in the width direction of the aquaculture tank 11 so as not to overlap with the aquaculture tank 11 in a plan view.

[0041] The filter tank 31 is formed in the shape of a rectangular parallelepiped box that is elongated from side to side and has an open top. Furthermore, a heat insulating material 33 is provided on the outer surface of the filter tank 31 so as to cover the outer surface. The heat insulating material 33 is composed of a plurality of heat insulating material pieces 33a, 33b, and 33c. The heat insulating material piece 33a is formed in the shape of a rectangular plate and is provided on opposing side end surfaces of the filter tank 31 so as to cover the side end surfaces. The heat insulating material piece 13b is formed in the shape of a rectangular plate and is provided on opposing side surfaces of the filter tank 31 so as to cover the side surfaces. The heat insulating material piece 13c is formed in the shape of a rectangular plate and is provided on the bottom surface of the filter tank 31 so as to cover the bottom surface.

[0042] Additionally, multiple partition walls 31a are provided inside the filtration tank 31 so as to stand upright from the bottom surface of the filtration tank 31. The multiple partition walls 31a are arranged in parallel, and these partition walls 31a separate, from right to left, a water receiving tank 34, a first filtration tank 35, a second filtration tank 36, a third filtration tank 37, a fourth filtration tank 38, and a drainage tank 39. The first filtration tank 35, the second filtration tank 36, the third filtration tank 37, and the fourth filtration tank 38 contain filter media 35a, 36a, 37a, and 38a, respectively. The drainage tank 39 is provided with a pump 40, and the lower end of a circulation path 41 formed of a pipe or the like is connected to this pump 40. The upper end opening of the circulation path 41 is located above the upstream side of the aquaculture tank 11. In addition, a circulation path 42 formed by a pipe or the like is inserted through the insulation piece 13a on the downstream side wall of the aquaculture tank 11, and the upper end opening of the circulation path 42 is arranged almost flush with the water surface of the upper tank 21 of the aquaculture tank 11. This circulation path 42 extends downward, and its lower end opening is arranged above the water receiving tank 34 of the filtration tank 31.

[0043] In this filtration tank 31, when the pump 40 is operated, fluid flows from the upper tank 21 of the aquaculture tank 11 into the circulation path 42 and is supplied from the lower opening of the circulation path 42 to the water-receiving tank 34. When the water-receiving tank 34 is full, the fluid flows over the partition wall 31a into the adjacent first filtration tank 35, and the fluid then flows over the partition wall 31a sequentially into the second filtration tank 36, the third filtration tank 37, and the fourth filtration tank 38. As the fluid passes through these filtration tanks 35, 36, and 37, impurities are filtered out by filter media 35a, 36a, 37a, and 38a, before flowing into the drainage tank 39, where it is filtered and supplied from the drainage tank 39 through the circulation path 41 to the upper tank 21 from the upper opening of the circulation path 41. As the pump 40 continues to operate, the fluid in the aquaculture tank 11 circulates between the tank and the filtration tank 31, and impurities are filtered out by the filtration tank 31 before being supplied to the aquaculture tank 11.

[0044] The land-based aquaculture apparatus of this embodiment is also provided with a filter device 44 that filters impurities from the fluid flowing out from the lower end opening of the circulation path 42. As shown in FIGS. 1 and 2, the filter device 44 includes a filtration filter 45 and reels 46, 47, and 48. Filtration filter 45 is wound around reel 46 and disposed above water receiving tank 34 of filtration tank 31. Filtration filter 45 is a flexible, planar filter, and filtration filter 45 unwound from reel 46 is wound around reel 47, which is disposed below reel 46 and above water receiving tank 34, to change direction, and is then wound around reel 48, which is disposed diagonally above reel 47 and diagonally below reel 46. The reel 48 is rotated by a motor (not shown) to wind up the filtration filter 45 unwound from the reel 46 .

[0045] The lower end opening of circulation path 42 is disposed above filter 45 located between reels 47 and 48, and fluid flowing down from this lower end opening passes through filter 45, thereby filtering impurities from the fluid. When reel 48 is rotated in the winding direction by the motor, filter 45 located between reels 47 and 48 becomes a new filter, enabling efficient filtering. When all filter filters 45 have been unwound from reel 46, filter 45 is replaced with the entire reel 46, and a new filter 45 is installed.

[0046] The land-based aquaculture device of this embodiment also includes a temperature regulator 50 that adjusts the temperature of the fluid circulating between the aquaculture tank 11 and the filtration tank 31. The temperature regulator 50 includes a heating unit 51 such as an electric heating wire arranged in the third filtration tank 37 of the filtration tank 31, and a control unit 52 that controls the temperature of the heating unit 51. The temperature regulator 50 also includes a sensor (not shown) that detects the temperature of the fluid in the third filtration tank 37, and this sensor is connected to the control unit 52. The temperature regulator 50 uses a sensor to detect the temperature of the fluid in the third filtration tank 37, and if the detected temperature is lower than a predetermined value, the control unit 52 controls the heating unit 51 to increase the temperature, and if the detected temperature is higher than the predetermined value, the control unit 52 controls the heating unit to decrease the temperature. Therefore, the temperature of the fluid circulating between the culture tank 11 and the filtration tank 31 can be adjusted to a predetermined temperature.

[0047] In this embodiment, the heating section 51 of the temperature regulator 50 is disposed in the third filtration tank 37 of the filtration tank 31, but instead of or in addition to this, the heating section 51 may be disposed in the first filtration tank 35, the second filtration tank 36, or the fourth filtration tank 39.

[0048] The land-based aquaculture device of this embodiment is also equipped with a blower 55. This blower 55 is disposed above and downstream of the aquaculture tank 11, and blows laminar airflow obliquely toward the surface of the fluid in the aquaculture tank 11. In this embodiment, the fan 55 blows laminar airflow onto the surface of the fluid in the opposite direction to the flow direction of the fluid that flows in laminar form from upstream to downstream in the upper tank 21 of the aquaculture tank 11, but the laminar airflow may also be blown onto the surface of the fluid in the direction of the fluid flow. In this case, the fan 55 is disposed above and upstream of the aquaculture tank 11. In this way, by blowing laminar airflow from the blower 55 onto the surface of the fluid, the temperature of the fluid can be effectively lowered.

[0049] In the land-based aquaculture device configured as described above, when the laminar flow pump (starting pump) 12 is operated, a fluid such as water contained in the aquaculture tank 11 flows as a laminar flow, circulating between the upper tank 21 and the lower tank 22. The flow velocity of the fluid (e.g., water) discharged from the discharge portion 18 of the laminar flow pump 12 is approximately equal in speed and direction from the center of the discharge portion 18 to the end (peripheral end) of the discharge portion, resulting in a laminar flow. As a result, the cultured organisms (e.g., fish) F in the upper tank 21 of the aquaculture tank 11 can swim and spread evenly in the left-right direction (direction perpendicular to the water flow) and the up-down direction (vertical direction of the aquaculture tank), improving the aquaculture density. Furthermore, the laminar flow makes the direction and magnitude of the fluid flow rate uniform, making it possible to equalize the exercise load on the cultured organisms F. This improves the aquaculture environment for the cultivated organisms F, resulting in an increase in aquaculture production.

[0050] In addition, since insulation material 13 is provided on the outer surface of the aquaculture tank 11 so as to cover the outer surface, the insulation material 13 suppresses temperature rises and falls of the fluid in the aquaculture tank 11, making it easy to maintain a constant temperature of the fluid. Furthermore, a fluid is circulated between an upper tank 21 above the separator 20 and a lower tank 22 below by a laminar flow pump 12, and since the cultured organisms F spread out evenly in the upper tank 12 and swim in one direction, the culture state of the cultured organisms F can be easily observed. Furthermore, since the laminar flow pump 12 is arranged in the lower tank 22, the cultured organisms F contained in the upper tank 21 will not collide with the laminar flow pump 12, thereby preventing damage to the cultured organisms F and the laminar flow pump 12. In addition, by generating laminar flow in the fluid in the culture tank 11 using the multiple laminar flow pumps 12, the culture target organisms F can be easily cultured even if the culture tank 11 is large.

[0051] Furthermore, laminar flow flows in one direction in the upper tank 21 of the culture tank 11 and in the other direction in the lower tank 22, so that the fluid flows in a circulating laminar flow between the upper and lower tanks, enabling efficient cultivation of the cultured organisms F in the upper tank 21. Furthermore, if the distance between the bottom surface of the lower tank 22 and the separator 20 is H1 and the distance between the separator 20 and the top surface of the fluid in the upper tank 21 is H2, then H2≧H1, and therefore the depth of the fluid in the upper tank 21 is greater than or equal to the depth of the fluid in the lower tank 22. This allows the number of cultured organisms F to be accommodated in the upper tank 21 to be increased, thereby increasing the number of cultured organisms. Furthermore, since H1 is higher than the vertical height of the laminar flow pump 12, the laminar flow pump 12 can be reliably disposed in the lower tank 22 without interfering with the separator plate 20.

[0052] In addition, a pair of openings 25, 26 are provided between the separator 20 and the inner wall surface of the culture tank 11 for circulating the fluid between the upper tank 21 and the lower tank 22, and the openings 25, 26 are provided at a position perpendicular to the flow direction of the fluid, and are not provided at a position parallel to the flow direction of the fluid, so that the fluid can be easily and efficiently circulated between the upper tank 21 and the lower tank 22 through the pair of openings 25, 26. Furthermore, of the pair of openings 25, 26, one opening 25 is an upstream opening 25 provided on the upstream side of the fluid flow direction in the upper tank 21, and the other opening 26 is a downstream opening 26 provided on the downstream side of the fluid flow direction, and since a laminar flow pump 12 is provided below the downstream opening 26, the fluid flowing from upstream to downstream in the upper tank 21 can be easily and reliably made to flow into the lower tank 22.

[0053] Furthermore, if the opening area of ​​the upstream opening 25 is A1 and the opening area of ​​the downstream opening 26 is A2, then A1 ≧ A2. The flow rate of a fluid is flow rate × area, and since the flow rates at the upstream opening 25 and downstream opening 26 are equal, the flow rate of the fluid at the upstream opening 25 is lower than the flow rate of the fluid at the downstream opening 26. As a result, the flow of the fluid is gentler on the upstream side than on the downstream side. Furthermore, since A1 ≧ A2, backflow of the fluid from the downstream opening 26 is prevented. Furthermore, since the upstream opening 25 and the downstream opening 26 are each formed to have an approximately rectangular shape when viewed in plan, the planar shapes of the upstream opening 25 and the downstream opening 26 can be made appropriate.

[0054] In addition, a filtration tank 31 is provided below the culture tank 11, and the culture tank 11 and the filtration tank 31 are connected by circulation paths 41, 42. As the pump 40 continues to operate, the fluid in the culture tank 11 circulates between the culture tank 11 and the filtration tank 31, and impurities are filtered out by the filtration tank 31 before being supplied to the culture tank 11, so that the fluid in the culture tank 11 can be subjected to water quality management that is optimal for cultivating the cultured organisms F. Furthermore, a filter device 44 is provided that filters impurities from the fluid flowing out from the opening at the lower end of the circulation path 42, and the fluid flowing down from the opening at the lower end of the circulation path 42 passes through a filtration filter 45, thereby filtering out impurities from the fluid. When the motor rotates the reel 48 in the winding direction, the filtration filter 45 located between the reels 47 and 48 becomes new and can filter efficiently.

[0055] The apparatus is also provided with a temperature regulator 50 that adjusts the temperature of the fluid circulating between the aquaculture tank 11 and the filtration tank 31. The temperature regulator 50 uses a sensor to detect the temperature of the fluid in the third filtration tank 37, and controls the controller 52 to raise the temperature of the heating unit 51 if the detected temperature is lower than a predetermined value, and to lower the temperature of the heating unit if the detected temperature is higher than the predetermined value. This allows the temperature of the fluid circulating between the aquaculture tank 11 and the filtration tank 31 to be adjusted to a predetermined temperature. It is also equipped with a blower 55, which blows laminar air onto the surface of the fluid flowing in laminar flow from upstream to downstream within the upper tank 21 of the aquaculture tank 11, thereby effectively lowering the temperature of the fluid.

[0056] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the above-described embodiments and can include various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to add, delete, or replace part of the configuration of the embodiments with other configurations. [Explanation of symbols]

[0057] 10 Land-based aquaculture equipment 11 Aquaculture tank 12 Laminar flow pump 13. Insulation 20 Separation plate 21. Separation tank 22 Lower tank 25 Opening (upstream opening) 26 Opening (downstream opening) 31 Filtration tank 41,42 Circulation route 44 Filter device 50 Temperature controller 55 Blower F Cultured body

Claims

1. A closed circulation land-based aquaculture device, a culture tank for accommodating the cultured organisms; and a flow pump capable of generating a laminar flow in the fluid in the aquaculture tank.

2. 2. The land-based aquaculture device according to claim 1, wherein a heat insulating material is provided on the outer surface of the aquaculture tank so as to cover the outer surface.

3. A separator plate is provided to separate the inside of the aquaculture tank into upper and lower sections, The fluid can be circulated between the upper tank above the separator and the lower tank below the separator by the pump. The cultured organisms are contained in the upper tank, 3. The land-based aquaculture device according to claim 1, wherein the upflow pump is disposed in the lower tank.

4. 4. The land-based aquaculture device according to claim 3, wherein one or more of the flow pumps are arranged.

5. An aquaculture device as described in claim 4, characterized in that the laminar flow generated by one or more of the flow pumps flows in one direction in the upper tank and in another direction opposite to the one direction in the lower tank.

6. An aquaculture device as described in claim 3, characterized in that when the distance between the bottom surface of the lower tank and the partition plate is H1 and the distance between the partition plate and the top surface of the fluid in the upper tank is H2, H2≧H1.

7. 7. The land-based aquaculture device according to claim 6, wherein the height H1 is higher than the vertical height of the upflow pump.

8. a pair of openings for circulating a fluid between the upper tank and the lower tank are provided between the separator and the inner wall surface of the aquaculture tank; The land-based aquaculture device according to claim 3, characterized in that the opening is provided at a position perpendicular to the direction of flow of the fluid, and is not provided at a position parallel to the direction of flow of the fluid.

9. one of the pair of openings is an upstream opening provided on the upstream side of the upper tank in the flow direction of the fluid, and the other opening is a downstream opening provided on the downstream side of the flow direction of the fluid, 9. The land-based aquaculture device according to claim 8, wherein the upflow pump is provided below the downstream opening.

10. When the opening area of ​​the upstream opening is A1 and the opening area of ​​the downstream opening is A2, The land-based aquaculture device according to claim 9, characterized in that A1≧A2.

11. The land-based aquaculture device according to claim 9, wherein the upstream opening and the downstream opening are each formed in a substantially rectangular, oval, or elliptical shape in plan view.

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