Fish and shellfish farming device, fish and shellfish farming method, and fish and shellfish farming program

Abstract

Increases the survival rate of fish and shellfish. [Solution] The fish and shellfish farming device 1 includes a light source 10 that irradiates the breeding water W in which the fish and shellfish are raised with ultraviolet light having a peak wavelength of 200 nm or more and 240 nm or less, a measurement unit 20 that measures the water quality of the breeding water W, and a control unit 30 that controls the amount of ultraviolet light irradiated by the light source 10 based on the water quality measured by the measurement unit 20.

Description

[Technical Field]

[0001] The present invention relates to a fish and shellfish farming device, a fish and shellfish farming method, and a fish and shellfish farming program. [Background technology]

[0002] An inactivation device and method that uses ultraviolet light with a wavelength of 200 nm or more and 240 nm or less (hereinafter also referred to as "Far-UVC") to inactivate harmful microorganisms and viruses is known (Patent Document 1). This device irradiates the inner surface of a compartment that contains seafood and water with Far-UVC light, thereby killing algae that adhere to the inner surface and can serve as a breeding ground for pathogens (microorganisms, viruses, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-056155 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 simply states that the Far-UVC irradiation dose should not exceed the allowable irradiation dose. However, even if the Far-UVC irradiation dose is below the allowable irradiation dose, if the irradiation dose is insufficient, the risk of infectious diseases in fish and shellfish caused by viruses, bacteria, etc. cannot be sufficiently reduced, and the desired survival rate cannot be achieved.

[0005] For example, if the breeding water is polluted, the necessary amount of Far-UVC may not reach the fish or shellfish. On the other hand, if the necessary amount of Far-UVC is irradiated when the breeding water is polluted, the fish or shellfish may become weak or die due to excessive irradiation.

[0006] The problem to be solved by the present invention is to provide a fish and shellfish farming device, a fish and shellfish farming method, and a fish and shellfish farming program that can increase the survival rate of fish and shellfish by irradiating an appropriate amount of Far-UVC. However, the present invention is not limited to this problem, and the problem to be solved by the present invention may also be a problem corresponding to each effect achieved by the configuration of each embodiment described below. [Means for solving the problem]

[0007] The fish and shellfish farming apparatus according to the present invention comprises: a light source that irradiates the water in which the fish and shellfish are raised with ultraviolet light having a peak wavelength of 200 nm or more and 240 nm or less; a measuring unit for measuring the water quality of the breeding water; a control unit that controls the amount of ultraviolet light emitted by the light source based on the water quality measured by the measurement unit; and Equipped with.

[0008] Further, in the fish and shellfish farming apparatus, The water quality is an absorption coefficient, a transmittance, or a turbidity of the rearing water, The control unit may control the light source so that the amount of ultraviolet light irradiation increases as the absorption coefficient or turbidity of the breeding water increases, or as the transmittance of the breeding water decreases.

[0009] Further, in the fish and shellfish farming apparatus, The water quality is the total dissolved solids of the rearing water, The control unit may control the light source so that the amount of ultraviolet light emitted increases as the total dissolved solids content of the breeding water increases.

[0010] Further, in the fish and shellfish farming apparatus, The water quality is the pH of the rearing water, The control unit may control the light source so that the lower the pH of the breeding water, the greater the amount of ultraviolet light irradiation.

[0011] Further, in the fish and shellfish farming apparatus, The control unit may exponentially increase the amount of ultraviolet light irradiation in response to an increase or decrease in the measured value of the water quality of the breeding water.

[0012] Further, in the fish and shellfish farming apparatus, The water quality may be at least one of the optical properties, total dissolved solids, pH, temperature, ammonia concentration, nitrite concentration, nitrate concentration, and dissolved oxygen of the breeding water.

[0013] Further, in the fish and shellfish farming apparatus, The light source may be positioned above the rearing water or inside the rearing water.

[0014] Further, in the fish and shellfish farming apparatus, The image display device may further include a light source moving unit that moves the light source.

[0015] The fish and shellfish farming method according to the present invention comprises: Obtaining measurement data on the water quality of the water in which fish and shellfish are raised, Based on the measurement data, the amount of ultraviolet light irradiated onto the breeding water and having a peak wavelength in the range of 200 nm to 240 nm is controlled.

[0016] The fish and shellfish farming program according to the present invention comprises: Computer, An information acquisition function that acquires measurement data on the water quality of the water in which the fish and shellfish are raised; Based on the measurement data, the device functions as a light source control function that controls the amount of ultraviolet light irradiated into the breeding water and having a peak wavelength in the range of 200 nm to 240 nm. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram showing a schematic configuration of a fish and shellfish farming apparatus according to an embodiment. FIG. [Figure 2] FIG. 2 is a functional block diagram of a control unit of the fish and shellfish farming apparatus according to the embodiment. [Figure 3] 10 is a graph showing an example of Far-UVC irradiation amount control according to the embodiment. [Figure 4] FIG. 1 is a diagram showing a schematic configuration of a fish and shellfish farming apparatus according to a first modified example of an embodiment. [Figure 5] FIG. 10 is a diagram showing a schematic configuration of a fish and shellfish farming apparatus according to a second modified example of the embodiment. [Figure 6] 1 is a flowchart illustrating an example of a fish and shellfish farming method according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing, components having equivalent functions are designated by the same reference numerals.

[0019] <Fish and shellfish farming equipment> A fish and shellfish farming apparatus 1 according to this embodiment will be described with reference to Figure 1. The fish and shellfish farming apparatus 1 is an apparatus for cultivating fish and shellfish S. In this embodiment, the fish and shellfish S are shrimp such as vannamei shrimp, but are not limited thereto and may be fish, crab, shellfish, etc.

[0020] The fish and shellfish farming apparatus 1 includes a light source 10 that irradiates far-UVC ultraviolet light UV, a measurement unit 20 that measures the water quality of the breeding water W in which the fish and shellfish S are raised, and a control unit 30 that controls the amount of ultraviolet light UV irradiated. The breeding water W is stored in a water storage unit 40. Although FIG. 1 shows only one light source 10, the fish and shellfish farming apparatus 1 may include multiple light sources 10.

[0021] The light source 10 is disposed above the breeding water W and irradiates ultraviolet light UV toward the breeding water W. This ultraviolet light UV is called Far-UVC and has a peak wavelength of 200 to 240 nm.

[0022] The light source 10 is an LED (Light Emitting Diode) that emits far-UVC light. LEDs have advantages over excimer lamps, such as being small and lightweight, and wavelength controllable. LEDs also generally have the characteristics of long life and low power consumption.

[0023] However, in this embodiment, the light source 10 is not limited to an LED, and other light sources such as an excimer lamp may also be used.

[0024] The measurement unit 20 measures the water quality of the breeding water W. Examples of the water quality to be measured include the optical properties of the breeding water W (absorption coefficient, transmittance, turbidity, etc.), the total dissolved solids (TDS) of the breeding water W, pH, the temperature of the breeding water W, the ammonia concentration, the nitrite concentration, the nitrate concentration, and dissolved oxygen. The measurement unit 20 may measure at least one of these.

[0025] The measurement unit 20 includes a measuring device appropriate for the type of water quality to be measured. For example, when measuring the absorption coefficient or transmittance of the breeding water, the measurement unit 20 includes a detector such as a photomultiplier tube or a photodiode. When measuring the turbidity of the breeding water W, the measurement unit 20 includes a turbidity meter. When measuring the total dissolved solids (total dissolved solids content) of the breeding water W, the measurement unit 20 includes an electrical conductivity meter (TDS meter).

[0026] Furthermore, when measuring the pH of the breeding water W, the measurement unit 20 includes a pH meter. When measuring the temperature of the breeding water W, the measurement unit 20 includes a water thermometer or an infrared thermometer. When measuring the ammonia concentration of the breeding water W, the measurement unit 20 includes an ammonia sensor.

[0027] The measurement unit 20 may measure a plurality of water qualities. In this case, the measurement unit 20 may include a plurality of measuring devices corresponding to the respective water quality measurements.

[0028] The control unit 30 controls the amount of Far-UVC radiation emitted by the light source 10 based on the water quality of the breeding water W measured by the measurement unit 20. Details of the control unit 30 will be described later with reference to FIG.

[0029] The water storage unit 40 is a tank (such as an FRP tank, a concrete tank, or a fish preserve) for raising fish and shellfish S. The water storage unit 40 may also be a pond (aquaculture pond) or the like.

[0030] Although not shown, the fish and shellfish farming apparatus 1 may also include a water supply and drainage system for the rearing water W, a filtering system, an aeration system, a temperature control system, a feeding system, and the like.

[0031] Next, the control unit 30 will be described in detail with reference to FIG.

[0032] The control unit 30 includes a communication interface 31 , a memory circuit 32 , and a processing circuit 33 .

[0033] The communication interface 31 has one or more interfaces for the control unit 30 to send control signals to the light source 10 and receive measurement data from the measurement unit 20 via wireless or wired communication. Note that there are no particular limitations on the communication method or standard. The communication interface 31 may also have a function for sending and receiving information (such as irradiation amount and measurement data) to and from an external information processing device (not shown).

[0034] The memory circuit 32 is composed of a semiconductor memory, a hard disk drive, etc. The memory circuit 32 stores a program to be executed by the processing circuit 33. The memory circuit 32 may also store various data such as data used to control the light source 10 (for example, mathematical formulas or table data representing the curves in FIG. 3 described below), measurement timing of the measurement unit 20 (for example, time data), the start date of the culture, and the culture period (for example, the number of days).

[0035] The processing circuit 33 has an information acquisition function 331 that acquires measurement data related to the water quality of the breeding water W, and a light source control function 332 that controls the amount of Far-UVC light emitted by the light source 10.

[0036] In this embodiment, the above-described functions of the processing circuitry 33 are stored in the storage circuitry 32 in the form of a program executable by a computer. The processing circuitry 33 is configured with one or more processors, and realizes the functions corresponding to each program by reading and executing the program from the storage circuitry 32. Note that one or more of the functions of the processing circuitry 33 may be realized by hardware.

[0037] The information acquisition function 331 acquires various pieces of information from the outside via the communication interface 31. For example, the information acquisition function 331 acquires measurement data on the water quality of the breeding water W from the measurement unit 20.

[0038] The light source control function 332 controls the amount of Far-UVC radiation emitted by the light source 10 based on the water quality of the breeding water W acquired by the information acquisition function 331. The amount of Far-UVC radiation is controlled by one or both of the radiation time and UV intensity (output of the light source 10). When the light source 10 is an LED, the light source control function 332 controls the amount of Far-UVC radiation by adjusting the value of the current flowing through the light source 10. Note that for more precise control of the amount of radiation, the light source control function 332 may control the amount of Far-UVC radiation by pulse width modulation (PWM).

[0039] A specific example of control of the light source 10 by the light source control function 332 will be described below.

[0040] When the water quality of the breeding water W measured by the measurement unit 20 is absorption coefficient, transmittance, or turbidity, the light source control function 332 controls the light source 10 to increase the amount of Far-UVC radiation emitted by the light source 10 as the absorption coefficient or turbidity of the breeding water W increases. The light source control function 332 also controls the light source 10 to increase the amount of Far-UVC radiation emitted by the light source 10 as the transmittance of the breeding water W decreases. More specifically, as shown in the graph of FIG. 3 , the light source control function 332 exponentially (accelerately) increases the amount of Far-UVC radiation emitted by the light source 10 (here, the irradiation time) in response to an increase in the measured value of the water quality (absorption coefficient, turbidity, total dissolved solids, etc.) of the breeding water W. When the water quality measured is transmittance, pH, etc., the light source control function 332 exponentially increases the amount of Far-UVC radiation emitted by the light source 10 in response to a decrease in the measured value.

[0041] Furthermore, when the water quality of the breeding water W measured by the measurement unit 20 is the total dissolved solids of the breeding water W, the light source control function 332 controls the light source 10 to increase the amount of Far-UVC radiation emitted by the light source 10 as the total dissolved solids of the breeding water W increases. In other words, the light source control function 332 controls the light source 10 to decrease the amount of Far-UVC radiation emitted by the light source 10 as the total dissolved solids of the breeding water W decreases. The total dissolved solids increase as the number of bacteria in the breeding water increases. By increasing the amount of Far-UVC radiation as the number of bacteria increases, the number of bacteria can be suppressed.

[0042] Furthermore, when the water quality of the breeding water W measured by the measurement unit 20 is the pH of the breeding water W, the light source control function 332 controls the light source 10 so that the lower the pH of the breeding water W, the more the light source 10 increases the amount of Far-UVC radiation emitted by the light source 10. In other words, the higher the pH of the breeding water W, the more the light source control function 332 controls the light source 10 so that the higher the pH of the breeding water W, the more the light source 10 decreases the amount of Far-UVC radiation emitted by the light source 10. As the number of bacteria in the breeding water increases, the pH decreases. By increasing the amount of Far-UVC radiation in response to an increase in the number of bacteria, the number of bacteria can be suppressed.

[0043] In either of the above methods, the amount of Far-UVC radiation emitted by the light source 10 is controlled based on the water quality of the breeding water W. This allows the amount of Far-UVC radiation to be kept within an appropriate range. As a result, the risk of infectious diseases of the fish and shellfish S caused by viruses and the like can be reduced, and weakening and death (mortality) of the fish and shellfish S due to excessive radiation can be avoided.

[0044] As described above, the fish and shellfish farming device 1 according to this embodiment includes the light source 10 that irradiates the breeding water W for the fish and shellfish S with ultraviolet light (Far-UVC) having a peak wavelength of 200 nm or more and 240 nm or less, the measurement unit 20 that measures the water quality of the breeding water W, and the control unit 30 that controls the amount of ultraviolet light irradiated by the light source 10 based on the water quality measured by the measurement unit 20. This allows the breeding water W to be irradiated with an appropriate amount of Far-UVC according to the water quality of the breeding water W.

[0045] As a result, according to this embodiment, it is possible to provide a fish and shellfish farming apparatus that can improve the survival rate of fish and shellfish.

[0046] <Variation 1> In the above embodiment, the light source 10 is disposed above the breeding water W, but this is not limited to this. Fig. 4 is a diagram showing a schematic configuration of a fish and shellfish farming device 1A according to Modification 1 of the present embodiment. As shown in Fig. 4, in this modification, the light source 10 is disposed in the breeding water W.

[0047] If the side or bottom surface of the water storage section 40 is transparent to Far-UVC, the light source 10 may be disposed to the side or below the water storage section 40.

[0048] Furthermore, the light sources 10 may be provided at each of the four corners inside the aquarium where the breeding water is stored.

[0049] <Variation 2> Fig. 5 is a diagram showing a schematic configuration of a fish and shellfish farming device 1B according to Modification 2 of this embodiment. In Fig. 5, the measurement unit 20 and the control unit 30 are not shown.

[0050] 5, the fish and shellfish farming device 1B according to this modification includes a light source moving unit 15 that moves the light source 10. The light source moving unit 15 includes a rail 15a installed above the water storage unit 40, and a slider 15b to which the light source 10 is attached and which moves along the rail 15a.

[0051] The slider 15b is controlled to move back and forth within a predetermined range along the rail 15a by a drive mechanism such as a belt drive, a ball screw drive, or a rack and pinion drive. The light source moving unit 15 may also move the light source 10 by a robot arm mechanism, a pantograph mechanism, or the like.

[0052] The light source moving section 15 is not limited to moving the light source 10 linearly, but may move the light source 10 in a curved, zigzag, or meandering manner.

[0053] Furthermore, when the water storage unit 40 has a large area such as an aquaculture pond, the light source moving unit 15 may be a movable floating object (such as a boat or raft) with the light source 10 provided on the bottom surface. The floating object may be remotely controlled or may be configured to be autonomously movable like an ASV (Autonomous Surface Vehicle).

[0054] According to this modified example, even if the water storage section 40 has a large area such as a pool or aquaculture area, it is possible to realize a fish and shellfish farming device that can improve the survival rate of fish and shellfish with just one or a small number of light sources 10.

[0055] <Fish and shellfish farming methods> Next, an example of a fish and shellfish farming method according to an embodiment will be described with reference to the flowchart of FIG.

[0056] Step S1: The processing circuit 33 (timing determination unit, not shown) of the control unit 30 determines whether the measurement timing for the measurement unit 20 has arrived. The measurement timing is a predetermined time of day (for example, 7:00 AM). If it is determined that the measurement timing has arrived (S1: Yes), proceed to step S2. On the other hand, if it is determined that the measurement timing has not arrived (S1: No), execute step S1 again after a predetermined time has elapsed.

[0057] The measurement timing may not be a time point, but may be a time interval (for example, 8 hours).

[0058] Step S2: The processing circuit 33 (information acquisition function 331) of the control unit 30 acquires measurement data on the water quality of the breeding water W from the measurement unit 20. The acquired measurement data may be stored in the memory circuit 32 so that the history of the measurement data can be referenced later.

[0059] Step S3: The processing circuit 33 (light source control function 332) of the control unit 30 controls the irradiation amount of ultraviolet light with a peak wavelength of 200 to 240 nm (Far-UVC) based on the water quality measurement data acquired in step S2. As described above, for example, if the measurement data is the absorption coefficient of the breeding water W, the light source control function 332 controls the light source 10 to irradiate Far-UVC for an irradiation time corresponding to the absorption coefficient of the breeding water W using the curve of the graph in Figure 3.

[0060] Step S4: The processing circuit 33 (timing determination unit, not shown) of the control unit 30 determines whether the culture period has ended. The culture period varies depending on the type of fish and shellfish being cultured. If it is determined that the culture period has ended (S4: Yes), the processing related to this culture method ends. On the other hand, if it is determined that the culture period has not yet ended (S4: No), the process returns to step S1.

[0061] According to the above-described fish and shellfish farming method, measurement data on the water quality of the rearing water W is acquired at predetermined intervals during the farming period, and the irradiation amount of the light source 10 is controlled based on the measurement data, thereby improving the survival rate of the fish and shellfish.

[0062] Based on the above description, a person skilled in the art may conceive additional effects and various modifications of the present invention, but the aspects of the present invention are not limited to the individual embodiments described above. Elements from different embodiments may be combined as appropriate. Various additions, modifications, and partial deletions are possible within the scope of the conceptual idea and spirit of the present invention, which is derived from the content defined in the claims and their equivalents.

[0063] Each part of the processing circuit 33 may be realized by a processor in the control unit 30 executing a predetermined program and the software processing being specifically realized using hardware resources, or may be realized by the implemented hardware itself.

[0064] When configured as software, a program that realizes at least part of the functions of the processing circuit 33 may be stored on a recording medium such as a flexible disk or a CD-ROM, and may be read and executed by a computer. The recording medium is not limited to removable recording media such as magnetic disks and optical disks, but may also be fixed recording media such as hard disk drives and memories.

[0065] In addition, a program that realizes at least a part of the functions of the processing circuit 33 may be distributed via a communication line (including wireless communication) such as the Internet. Furthermore, the program may be encrypted, modulated, or compressed and distributed via a wired line or wireless line such as the Internet, or stored on a recording medium. [Explanation of symbols]

[0066] 1,1A,1B Fish and shellfish farming equipment 10 light source 15 Light source moving part 15a rail 15b slider 20 Measuring part 30 Control Unit 31 Communication Interface 32 Memory circuit 33 Processing circuit 331 Information Acquisition Function 332 Light source control function 40 Water storage section S Seafood UV Ultraviolet (Far-UVC) W breeding water

Claims

1. a light source that irradiates the breeding water stored in the water storage section for breeding fish and shellfish with ultraviolet light having a peak wavelength of 200 nm or more and 240 nm or less; a measuring unit for measuring the water quality of the breeding water; a control unit that controls the amount of ultraviolet light emitted by the light source based on the water quality measured by the measurement unit; and A fish and shellfish farming device comprising:

2. The water quality is an absorption coefficient, a transmittance, or a turbidity of the rearing water, The fish and shellfish farming device according to claim 1 , wherein the control unit controls the light source so as to increase the amount of ultraviolet light irradiation as the absorption coefficient or turbidity of the breeding water increases or as the transmittance of the breeding water decreases.

3. The water quality is the total dissolved solids of the rearing water, The fish and shellfish farming device according to claim 1 , wherein the control unit controls the light source so that the amount of ultraviolet light irradiation increases as the total dissolved solids content of the breeding water increases.

4. The water quality is the pH of the rearing water, The fish and shellfish farming device according to claim 1 , wherein the control unit controls the light source so that the amount of ultraviolet light emitted increases as the pH of the breeding water decreases.

5. The fish and shellfish farming device according to any one of claims 2 to 4, wherein the control unit exponentially increases the amount of ultraviolet radiation irradiated in response to an increase or decrease in the measured value of the water quality of the breeding water.

6. 2. The fish and shellfish farming device according to claim 1, wherein the water quality is at least one of the optical properties, total dissolved solids, pH, temperature, ammonia concentration, nitrite concentration, nitrate concentration, and dissolved oxygen of the rearing water.

7. The fish and shellfish farming device according to claim 1 , wherein the light source is disposed above the breeding water or inside the breeding water.

8. The fish and shellfish farming device according to claim 1 , further comprising a light source moving unit that moves the light source.

9. Obtaining measurement data on the water quality of the water stored in the water storage section where fish and shellfish are raised, A fish and shellfish farming method, which controls the amount of ultraviolet light irradiated into the breeding water and having a peak wavelength in the range of 200 nm or more and 240 nm or less based on the measurement data.

10. Computer, An information acquisition function that acquires measurement data on the water quality of the water stored in the water storage section where fish and shellfish are raised; A fish and shellfish farming program that functions as a light source control function that controls the amount of ultraviolet light irradiated into the breeding water and having a peak wavelength in the range of 200 nm or more and 240 nm or less based on the measurement data.

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