Shellfish aquaculture system

Abstract

The present disclosure provides a shellfish aquaculture system comprising a rearing tank for rearing shellfish, a water supply device for supplying water to the rearing tank, a water discharge device for discharging water from the rearing tank, and a control device, wherein the control device controls the water supply device and / or the water discharge device on the basis of the algae concentration in the rearing tank.

Description

Shellfish farming system

[0001] The present disclosure relates to shellfish farming systems.

[0002] Shellfish farming in natural marine areas is susceptible to fluctuations in the marine environment, such as the amount of plankton to feed on, oxygen concentration, and marine pollution, making stable production difficult. For this reason, land-based shellfish farming, which allows for easy environmental control and stable production, has become increasingly popular in recent years (Non-Patent Document 1).

[0003] One example of a technology for land-based shellfish farming is a free-flowing, completely land-based oyster farming method using deep-sea water (Patent Document 1). While free-flowing shellfish farming using deep-sea water has the advantage of being able to use deep-sea water as breeding water, which is highly clean and has stable water quality, such as temperature and composition, the deep-sea water itself contains almost no plankton, which serves as food for the shellfish, so it is necessary to supply shellfish food such as algae to the breeding tank. However, when algae are supplied as food in free-flowing shellfish farming, there is a problem that the algae flow out of the breeding tank before they can be sufficiently consumed by the shellfish, resulting in waste and additional costs for culturing the algae.

[0004] Patent No. 6267810

[0005] Farm Suzuki website: https: / / www.farmsuzuki.jp /

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a shellfish farming system.

[0007] In one aspect of the present disclosure, there is provided a shellfish farming system comprising a breeding tank for raising shellfish, a water supply device for supplying water to the breeding tank, a drainage device for draining water from the breeding tank, and a control device, wherein the control device controls the water supply device and / or the drainage device based on the algae concentration in the breeding tank.

[0008] According to the present disclosure, a shellfish farming system can be provided.

[0009] Figure 1 is an overall configuration diagram showing an example of a shellfish farming system of an embodiment. Figure 2 is a functional block diagram showing the configuration of the shellfish farming system of an embodiment. Electrical connections are indicated by dotted lines and fluid connections are indicated by solid lines. Figure 3 is a flowchart showing an example of shellfish farming using the shellfish farming system of an embodiment. Figure 4 is a hardware configuration diagram of a control device of an embodiment.

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0011] <Shellfish farming system>

[0012] Fig. 1 is a diagram showing the overall configuration of an example of a shellfish farming system according to an embodiment. The shellfish farming system shown in the figure includes a breeding tank 1, a water supply device 2, a drainage device 3, a control device 4, an irradiation device 5, an algae culture tank 6, an algae supply device 7, and a drainage tank 8.

[0013] The shellfish farming system of the present disclosure includes a breeding tank 1. Shellfish are raised in the breeding tank 1. There are no limitations on the type of shellfish that can be raised in the breeding tank 1. Shellfish in the present disclosure include shell-bearing mollusks. The mollusks may be marine or freshwater mollusks. Examples of such mollusks include mollusks from the classes Polyplacophora, Gastropoda, Cephalopoda, Bivalvia, and Scaphopoda. In particular, the shellfish farming system of the embodiment is suitable for the class Polyplacophora. Examples of the class Polyplacophora include the subclass Nutella, the subclass Incus, the subclass Mytilus, the subclass Triangularis, the subclass Meretrix, and the subclass Pseudocarpus. Preferred examples of shellfish include shellfish that feed on phytoplankton including microalgae. Specific examples of shellfish include blood shells, Akazara oysters, pearl oysters, short-necked clams, Azuma shiitake, Pectinella spp., Siberian anemones, oysters, corbiculatus, pen shells, moon oysters, cockles, hard clams, clams, scallops, surf clams, Pacific scallops, hard clams, giant clams, razor clams, and purple mussels. Examples of oysters include species belonging to the family Pectiniidae or the order Ostrichidae.

[0014] When breeding shellfish, breeding water is stored in the breeding tank 1. Depending on the type of shellfish, seawater or diluted seawater can be used as the breeding water, but deep-sea water is preferable. Alternatively, artificial breeding water with adjusted components and temperature, such as artificial seawater, can be used as the breeding water.

[0015] Algae that serve as food for shellfish are added to the breeding water as needed. Algae cultured in an algae culture tank 6 can be used as the algae added to the breeding water. The algae used for breeding shellfish are typically non-sessile algae, with microalgae being particularly preferred. Examples of microalgae include diatoms, haptophytes, and prasinophytes. More specific examples of microalgae include algae from the genera Chaetoceros, Isochrysis, Pavlova, Pyramimonas, and Tisochrysis.

[0016] The breeding water may contain salts, minerals such as calcium, and pH adjusters. The breeding tank 1 may also be equipped with aquaculture equipment known to those skilled in the art, including an aeration device, a temperature control device, and breeding cages for housing shellfish.

[0017] Figure 2 is a functional block diagram showing an example configuration of the shellfish farming system shown in Figure 1. The illustrated breeding tank 1 is equipped with a chlorophyll turbidity meter 11, a water quality sensor 12, and a circulation device 13, the algae culture tank 6 is equipped with a chlorophyll turbidity meter 61 and a circulation device 62, and the wastewater tank 8 is equipped with a chlorophyll turbidity meter 81 and a circulation device 82.

[0018] The chlorophyll turbidity meter 11 measures the chlorophyll fluorescence intensity and / or turbidity in the breeding tank 1. Because algae contain chlorophyll for photosynthesis, it is generally understood by those skilled in the art that there is a positive correlation between the algae concentration in the environment and the chlorophyll fluorescence intensity and turbidity. The chlorophyll turbidity meter 11 may be, for example, a chlorophyll turbidity meter equipped with an optical sensor known by those skilled in the art. It is preferable that the chlorophyll turbidity meter 11 be electrically connectable to an external device and capable of acquiring chlorophyll fluorescence intensity data and / or turbidity data from the connected external device in real time. In this embodiment, the chlorophyll turbidity meter 11 is electrically connected to the control device 4, and the control device 4 acquires chlorophyll fluorescence intensity data and / or turbidity data in the breeding water of the breeding tank 1 in real time.

[0019] In the embodiment, the breeding tank 1 includes one or more water quality sensors 12. The water quality sensor 12 measures the water quality in the breeding tank 1. The water quality to be measured may include one or more of CO2 concentration, water temperature, pH, and dissolved oxygen (DO). Therefore, in the embodiment, the water quality sensor 12 may include one or more selected from the group consisting of a CO2 sensor, a water temperature sensor, a pH sensor, and a DO sensor. These sensors may be sensors known by those skilled in the art that correspond to the object to be measured. The water quality sensor 12 is preferably electrically connectable to an external device and capable of acquiring water quality data from the connected external device in real time. In the embodiment, the water quality sensor 12 is electrically connected to the control device 4, and water quality data of the breeding water in the breeding tank 1 is acquired by the control device 4 in real time.

[0020] The circulation device 13 circulates the breeding water in the breeding tank 1. The circulation device 13 may be, for example, a water pump known to those skilled in the art. It is preferable that the circulation device 13 be electrically connected to the control device 4 and have its output electrically controlled. For example, if the oxygen concentration or CO2 concentration in the breeding tank 1 decreases, or if the pH increases or decreases, the control device 4 can change the circulation rate of the breeding water in the breeding tank 1 using the circulation device 13. Alternatively, if the water in the breeding tank 1 must be homogeneous to accurately measure chlorophyll fluorescence intensity and / or turbidity, the circulation device 13 may circulate the water in the breeding tank 1 continuously or in response to the control of the control device 4.

[0021] The shellfish farming system of the present disclosure includes a water supply device 2 for supplying water to the breeding tank 1 and a drainage device 3 for draining water from the breeding tank 1. The water supply device 2 and the drainage device 3 are fluidly connected to the breeding tank 1. In this disclosure, the term "fluid connection" includes both direct connection by a water pipe and a connection without direct connection (at least constantly) by a water pipe but ensuring fluid movement. Therefore, the fluid connection may be, for example, a connection in which fluid movement is ensured from an upstream tank to a downstream tank via a water pipe and a connected water faucet. "Run-through" breeding can be achieved by simultaneously supplying water via the water supply device 2 and draining water via the drainage device 3 at the same flow rate. When this type of water supply and drainage is performed, the breeding water in the breeding tank 1 is at least partially replaced. Furthermore, the flow rate of the breeding water passing through the breeding tank 1 can be increased by increasing the water supply rate (and drainage rate) while maintaining the same flow rate of the water supply and drainage. In this case, the rate at which the breeding water in the breeding tank 1 is replaced increases.

[0022] The water supply device 2 may include one or more pieces of equipment selected from a water tank, fluid pipes, pumps, valves, etc. necessary for water supply. For example, the water supply device 2 may include a pump and water pipes that directly pump seawater and supply it to the breeding tank 1. Alternatively, the water supply device 2 may include a water tank, fluid pipes, and valves configured to supply breeding water, such as pre-pumped deep-sea water, by gravity.

[0023] The drainage device 3 may include one or more pieces of equipment selected from fluid pipes, pumps, valves, etc. necessary for drainage. Alternatively, the drainage device 3 may include a water receiver and water pipes configured to drain the breeding water overflowing from the breeding tank 1 by gravity. When such a drainage device 3 is used, the same amount of breeding water as the breeding water supplied from the water supply device 2 is drained, facilitating free-flow aquaculture. The drainage device 3 may be fluidly connected to a drainage tank 8 that stores the wastewater. Algae contained in the wastewater stored in the drainage tank 8 can be recovered by a filter and reused. The drainage tank 8 may be equipped with a chlorophyll turbidity meter 81. The drainage tank 8 may also be equipped with a circulation device 82 for circulating the wastewater. The drainage device 3 may also be equipped with a filter (electrically connected to the control device 4 and controlled independently of the valve) to prevent algae from flowing out. For example, if sensors in the breeding tank 1 detect a deterioration in water quality, the drainage device 3 under the control of the control device 4 will open the drainage valve from the breeding tank 1 to the drainage tank 8, and the water supply device 2 will supply new breeding water.However, if the algae-feeding rate of the shellfish has not decreased and / or there is a large amount of algae in the breeding tank, the filter of the drainage device 3 will not be opened, and only the valve will be opened, allowing the algae to remain in the breeding tank.

[0024] The shellfish farming system of the present disclosure includes a control device 4. As illustrated for different system components throughout this specification, the control device 4 can determine whether or not to take control action for the corresponding system component, based on values ​​measured by sensors or measuring devices (e.g., based on measurement thresholds that can be set by the user). For example, the point at which the control device instructs the stopping / restarting of feeding or the start / stop of drainage can be adjusted by the user by arbitrarily changing the thresholds of the sensor measurements. In this way, system control can be automated. Thresholds may also be referred to as reference values.

[0025] The control device 4 controls the water supply device 2 and / or the drainage device 3 based on the algae concentration in the breeding tank 1. The control device 4 may control the water supply device 2 and / or the drainage device 3 so as to prevent the algae in the breeding tank 1 from flowing out when the algae concentration in the breeding tank 1 is high (i.e., when the amount of algae is such that it would take a long time for the shellfish in the breeding tank to consume it). Alternatively, the control device 4 may control the water supply device 2 and / or the drainage device 3 so as to reduce the flow rate of breeding water supplied and drained through the water supply device 2 and / or the drainage device 3 when the algae concentration in the breeding tank 1 is high. The control device 4 may control so as to increase the flow rate of breeding water supplied and drained through the water supply device 2 and / or the drainage device 3 when the algae concentration in the breeding tank 1 is low (i.e., when the amount of algae is such that it can be sufficiently consumed in a short time by the shellfish in the breeding tank). This allows the benefits of a larger supply of fresh breeding water to be enjoyed in situations where the unnecessary flow of algae is avoided. Furthermore, the control device 4 of the embodiment may control the water supply device 2 and / or the drainage device 3 to at least partially replace the breeding water in the breeding tank 1 when the algae concentration in the breeding tank 1 falls below a reference value. Such replacement of the breeding water can be easily achieved by using the water supply device 2 and the drainage device 3 to perform free-flowing water supply and drainage. The reference value for the algae concentration can be set to an appropriate value based on, for example, the allowable amount of algae that can be discharged from the breeding tank 1 due to water supply and drainage. By performing the above-described control, the amount of algae that is discharged before being consumed by shellfish in the breeding tank 1 can be reduced, allowing the algae to be used efficiently.

[0026] Alternatively, the control device 4 may control the water supply device 2 and / or the drainage device 3 to adjust the flow rate of the water supply and drainage depending on the rate at which the shellfish are preying on algae in the breeding tank 1. The rate at which the shellfish are preying on algae in the breeding tank 1 can be determined by calculating the decrease in algae concentration per unit time based on the measurements of the chlorophyll turbidity meter 11 and / or the chlorophyll turbidity meter 61. The control device 4 can control the water supply and drainage rate so that the faster the preying rate is, the higher the rate of water supply and drainage.

[0027] In an embodiment, the control device 4 may be electrically connected to the chlorophyll turbidity meter 11 in the breeding tank 1. Such an electrical connection allows the control device 4 to acquire data on chlorophyll fluorescence intensity and / or turbidity in the breeding tank 1 in real time. Furthermore, in an embodiment, the control device 4 may determine the algae concentration in the breeding tank 1 based on the chlorophyll fluorescence intensity and / or turbidity in the breeding tank 1. The control device 4 may control the water supply device 2 and / or the drainage device 3 based on the determined algae concentration in the breeding tank 1. The control device 4 may determine the algae concentration in the breeding tank 1 based on the chlorophyll fluorescence intensity and / or turbidity and a predetermined relationship between the chlorophyll fluorescence intensity and / or turbidity and the number of algae cells per volume of breeding water. Alternatively, the measured value of the chlorophyll fluorescence intensity and / or turbidity itself may be used as a numerical value indicating the algae concentration. Information on the algae species contained in the breeding tank 1 and information on the amount of chlorophyll contained in the cells of the algae species may be used to determine the algae concentration.

[0028] In this embodiment, the control device 4 controls the water supply device 2 and / or the drainage device 3 based on water quality data. Examples of such water quality data include the CO2 concentration, water temperature, pH, and DO in the breeding tank 1. The water quality data can be acquired in real time from a water quality sensor 12 in the breeding tank 1 that is electrically connected to the control device 4. If the environment in the breeding tank 1, as indicated by the water quality data, becomes unsuitable for breeding shellfish, the control device 4 may control the water supply device 2 and / or the drainage device 3 to at least partially replace the breeding water in the breeding tank 1. For example, CO2 concentration and pH generally have a negative correlation, while oxygen concentration and pH have a positive correlation. Therefore, if the correlation between these two values ​​disappears or deviates from the normal correlation, foreign matter may have entered the breeding tank 1, and replacement of the breeding water may be desirable. This type of breeding water replacement can be performed in the same way as replacing the breeding water based on the algae concentration in the breeding tank 1.

[0029] In an embodiment, the control device 4 controls the circulation device 13 based on data on the algae concentration and / or water quality in the breeding tank 1. The control device 4 may be electrically connected to the circulation device 13 and control the output of the circulation device 13. Such output control can be performed, for example, by the control device 4 controlling the output of a water flow pump included in the circulation device 13 using a method known to those skilled in the art. For example, if there is a decrease in DO, an increase in CO2 concentration, or a deviation of pH from the normal range, it may be necessary to circulate the water in the aquarium. In such cases, the control device 4 can activate the circulation device 13 or increase its output to promote water circulation.

[0030] The shellfish farming system of this embodiment includes an illumination device 5. The illumination device 5 is not limited as long as it can emit light suitable for algae photosynthesis, and may include LEDs, fluorescent lamps, or incandescent lamps. The light emitted by the illumination device 5 preferably includes visible light having a wavelength of 400-700 nm. The illumination device 5 may be constantly lit to promote algae photosynthesis.

[0031] The control device 4 of the embodiment controls the illumination device 5 based on the algae concentration and / or water quality data in the breeding tank 1. Therefore, it is preferable that the control device 4 is electrically connected to the illumination device 5. The control device 4 performs optimal light illumination for shellfish breeding based on the algae concentration and / or water quality data in the breeding tank 1. For example, if the carbon dioxide concentration in the breeding tank 1 rises above a certain level, it is suspected that the shellfish in the breeding tank 1 are suffering from an oxygen deficiency. In such a case, the control device 4 can turn on the illumination device 5 or increase the illumination intensity to promote photosynthesis of the algae and supply oxygen.

[0032] The shellfish farming system of this embodiment includes an algae culture tank 6 and an algae supplying device 7 that supplies algae from the algae culture tank 6 to the breeding tank 1. Algae, which serves as food for the shellfish to be supplied to the breeding tank 1, is cultivated in the algae culture tank 6. The algae culture tank 6 is fluidly connected to the algae supplying device 7. The algae supplying device 7 may include one or more pieces of equipment selected from fluid pipes, pumps, valves, etc. necessary for algae supply, and is fluidly connected to the algae culture tank 6 and the breeding tank 1. For example, the algae supplying device 7 may include a pump and water pipes for supplying algae from the algae culture tank 6 to the breeding tank 1. Alternatively, the algae supplying device 7 may include fluid pipes and valves configured to supply algae from the algae culture tank 6 by gravity. The algae supplying device 7 may also be electrically connected to the control device 4. This electrical connection allows the control device 4 to control the algae supplying device. For example, after the breeding water in the breeding tank 1 is replaced by the water supply device 2 and / or the drainage device 3, the control device 4 can supply new algae to the breeding tank 1 by controlling the algae supply device 7.

[0033] The algae culture in the algae culture tank 6 can be carried out using a medium for algae known by those skilled in the art. Alternatively, the algae culture can be carried out using seawater, diluted seawater, or seawater to which additional components have been added. The algae culture tank 6 can be equipped with a temperature control device, a circulation device, and / or a light irradiation device for the algae culture, and these devices can be electrically connected to the control device 4 for data acquisition and / or control.

[0034] In this embodiment, the control device 4 controls the algae supplying device 7 based on one or more selected from the group consisting of the algae concentration in the breeding tank 1, the algae predation rate of the shellfish in the breeding tank 1, and water quality data of the breeding tank 1. For example, if the algae concentration in the breeding tank 1 decreases and the shellfish are not being fed sufficiently, the control device 4 can control the algae supplying device 7 to supply new algae to the breeding tank 1.

[0035] The algae culture tank 6 of the embodiment may be equipped with a chlorophyll turbidity meter 61 and / or a circulation device 62. The chlorophyll turbidity meter 61 is preferably electrically connected to the control device 4, thereby allowing the control device 4 to acquire chlorophyll fluorescence intensity data and / or turbidity data within the algae culture tank 6. The control device 4 may determine the algae concentration within the algae culture tank 6 based on this data, and may then decide whether or not to supply algae to the cultivation tank 1 based on this data. The description regarding the determination of the algae concentration within the cultivation tank 1 can be applied to such determination of the algae concentration. If the water within the algae culture tank 6 is not uniform, the water within the algae culture tank 6 may be circulated by the circulation device 62, either continuously or under the control of the control device 4.

[0036] The algae culture tank 6 of the embodiment may include a water quality sensor. This water quality sensor is connected to the control device 4 and can be used to acquire data (e.g., data similar to that acquired by the water quality sensor 12 in the culture tank 1) that is the basis for decisions required by the control device 4 regarding water supply, drainage, light irradiation, circulation of fluids in the culture tank 1 or the algae culture tank 6, and / or algae supply.

[0037] The shellfish farming system of this embodiment further includes a drainage tank 8 fluidly connected to the drainage device 3, and the control device 4 controls the water supply device 2 and / or the drainage device 3 based on one or more selected from the group consisting of the algae concentration in the breeding tank 1, the algae predation rate of the shellfish in the breeding tank 1, water quality data in the breeding tank 1, the algae concentration in the algae culture tank 6, and the algae concentration in the drainage tank 8. The algae concentration in the drainage tank 8 may be determined based on chlorophyll fluorescence intensity and / or turbidity acquired by a chlorophyll turbidity meter 81. The description regarding the determination of the algae concentration in the breeding tank 1 is applicable to such determination of the algae concentration. The algae concentration in the drainage tank 8 may be used by the control device 4 to control the water supply device 2 and / or the drainage device 3 as an indication of the degree of algae outflow from the breeding tank 1. For example, if the algae concentration in the drainage tank 8 is high and therefore the amount of algae outflow from the breeding tank 1 is estimated to be large, the control device 4 may control the water supply device 2 and / or the drainage device 3 to prevent the algae from outflowing from the breeding tank 1. If the water in the drainage tank 8 is not uniform in order to accurately measure the chlorophyll fluorescence intensity and / or turbidity, the water in the drainage tank 8 may be circulated by the circulation device 82 either continuously or under the control of the control device 4. <Shellfish Cultivation Method>

[0038] Next, an example of a shellfish farming method using the shellfish farming system of the embodiment will be described with reference to the flowchart of Figure 3.

[0039] In step S1, algae are cultivated in the algae culture tank 6. The turbidity in the algae culture tank 6 is measured by a chlorophyll turbidity meter 61, and the measurement data is sent to the control device 4. The control device 4 determines that algae can be supplied when the algae concentration in the algae culture tank 6 exceeds a reference value. Alternatively, the control device 4 may determine that algae can be supplied when the algae concentration in the breeding tank 1 falls below the reference value.

[0040] In step S2, the algae supplying device 7 supplies algae from the algae culture tank 6 to the breeding tank 1. The supply of algae continues until the algae concentration in the breeding tank 1 reaches a desired (or predetermined) value.

[0041] In step S3, the turbidity in the breeding tank 1 is measured by the chlorophyll turbidity meter 11. The measured turbidity data is sent to the control device 4. The control device 4 determines the algae concentration in the breeding tank 1 based on the turbidity.

[0042] In step S4, the water quality sensor 12 measures the water quality data in the breeding tank 1. The measured water quality data is sent to the control device 4.

[0043] In step S5, the control device 4 determines whether it is appropriate to perform one or more of the following: water replacement, circulation control, and light irradiation. If it is determined that it is appropriate, the process proceeds to step S6. If it is determined that it is not appropriate, the process proceeds to step S7.

[0044] In step S6, the control device 4 controls one or more devices selected from the group consisting of the water supply device 2, the drainage device 3, the circulation device 13, and the irradiation device 5 based on the decision made in step S5, thereby performing one or more devices selected from the group consisting of rearing water replacement, circulation control, and light irradiation.

[0045] In step S7, the control device 4 determines whether or not it is necessary to supply algae based on the algae concentration and / or water quality data in the breeding tank 1. If it is determined that it is necessary, steps S2 and onward are repeated. If it is determined that it is not necessary, steps S3 and onward are repeated.

[0046] The control device 4 described above can be, for example, a general-purpose computer system as shown in Fig. 4. The computer system shown in the figure includes a CPU (Central Processing Unit, processor) 901, a memory 902, a storage 903 (HDD: Hard Disk Drive, SSD: Solid State Drive), a communication device 904, an input device 905, and an output device 906. The memory 902 and the storage 903 are storage devices. In this computer system, the CPU 901 executes a predetermined program loaded on the memory 902, thereby realizing the functions of the control device 4.

[0047] The control device 4 may be implemented by one computer or multiple computers. The control device 4 may also be a virtual machine implemented on a computer. The program for the control device 4 may be stored on a computer-readable recording medium such as a HDD, SSD, Universal Serial Bus (USB) memory, a Compact Disc (CD), or a Digital Versatile Disc (DVD), or may be distributed via a network. The computer-readable recording medium may be, for example, a non-transitory recording medium. The electrical connections described in this disclosure, particularly the electrical connections between the control device and any or all of the system components illustrated in FIG. 2, may be connections via electrical wires, optical fibers, cables, etc., or may be connections via wireless telecommunications such as Wi-Fi.

[0048] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention.

[0049] The present disclosure includes the following embodiments: (Item 1) A shellfish farming system comprising a breeding tank for raising shellfish, a water supply device for supplying water to the breeding tank, a drainage device for draining water from the breeding tank, and a control device, wherein the control device controls the water supply device and / or the drainage device based on the algae concentration in the breeding tank. (Item 2) The shellfish farming system described in Item 1, wherein the breeding tank further comprises a chlorophyll turbidity meter for measuring chlorophyll fluorescence intensity and / or turbidity, and the control device determines the algae concentration based on the chlorophyll fluorescence intensity and / or turbidity. (Item 3) The shellfish farming system described in Item 1 or 2, wherein the control device controls the water supply device and / or the drainage device to at least partially replace the breeding water in the breeding tank when the algae concentration in the breeding tank falls below a reference value. (Item 4) The shellfish farming system of any one of Items 1 to 3, wherein the breeding tank further comprises a water quality sensor that measures water quality data, and wherein the control device further controls the water supply device and / or the drainage device based on the water quality data. (Item 5) The shellfish farming system of Item 4, wherein the water quality sensor includes one or more selected from the group consisting of a CO2 sensor, a water temperature sensor, a pH sensor, and a DO sensor. (Item 6) The shellfish farming system of Item 4 or 5, further comprising an illumination device for irradiating the breeding tank with light, and wherein the control device controls the illumination device based on the algae concentration and / or the water quality data. (Item 7) The shellfish farming system of any one of Items 4 to 6, further comprising an algae culture tank and an algae supply device that supplies algae from the algae culture tank to the breeding tank, and wherein the control device controls the algae supply device based on one or more selected from the group consisting of the algae concentration, the algae predation rate of shellfish in the breeding tank, and the water quality data. (Item 8) A shellfish farming system according to any one of Items 4 to 7, wherein the breeding tank further comprises a circulation device for circulating breeding water in the breeding tank, and the control device controls the circulation device based on the algae concentration and / or the water quality data.(Item 9) The shellfish farming system of Item 7, further comprising a drainage tank fluidly connected to the drainage device, and the control device controls the water supply device and / or the drainage device based on one or more selected from the group consisting of the algae concentration in the breeding tank, the algae predation rate of shellfish in the breeding tank, the water quality data, the algae concentration in the algae culture tank, and the algae concentration in the drainage tank. (Item 10) A method of farming shellfish, comprising cultivating shellfish using the shellfish farming system of any one of Items 1 to 9.

[0050] REFERENCE SIGNS LIST 1 breeding tank 2 water supply device 3 drainage device 4 control device 5 irradiation device 6 algae culture tank 7 algae supply device 8 drainage tank 11 chlorophyll turbidity meter 12 water quality sensor 13 circulation device 61 chlorophyll turbidity meter 62 circulation device 81 chlorophyll turbidity meter 82 circulation device

Claims

1. A shellfish farming system comprising a breeding tank for raising shellfish, a water supply device for supplying water to the breeding tank, a drainage device for draining water from the breeding tank, and a control device, wherein the control device controls the water supply device and / or the drainage device based on the algae concentration in the breeding tank.

2. The shellfish farming system of claim 1, wherein the breeding tank further comprises a chlorophyll turbidity meter for measuring chlorophyll fluorescence intensity and / or turbidity, and the control device determines the algae concentration based on the chlorophyll fluorescence intensity and / or turbidity.

3. A shellfish farming system as described in claim 1 or 2, wherein the control device controls the water supply device and / or the drainage device to at least partially replace the breeding water in the breeding tank when the algae concentration in the breeding tank falls below a standard value.

4. A shellfish farming system as described in claim 1 or 2, wherein the breeding tank further comprises a water quality sensor that measures water quality data, and the control device further controls the water supply device and / or the drainage device based on the water quality data.

5. The shellfish farming system of claim 4, wherein the water quality sensor includes one or more selected from the group consisting of a CO2 sensor, a water temperature sensor, a pH sensor, and a DO sensor.

6. A shellfish farming system as described in claim 4, further comprising an illumination device for irradiating light into the breeding tank, and wherein the control device controls the illumination device based on the algae concentration and / or the water quality data.

7. The shellfish farming system of claim 4, further comprising an algae culture tank and an algae supply device that supplies algae in the algae culture tank to the breeding tank, wherein the control device controls the algae supply device based on one or more selected from the group consisting of the algae concentration, the algae predation rate of shellfish in the breeding tank, and the water quality data.

8. A shellfish farming system as described in claim 4, wherein the breeding tank further comprises a circulation device for circulating the breeding water in the breeding tank, and the control device controls the circulation device based on the algae concentration and / or the water quality data.

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