JP7128764B2 - tail number calculation method, tail number calculation device, tail number measurement method, tail number measurement system, tail number calculation program - Google Patents

Description

The present invention relates to a fish number calculation method for calculating the number of fish in a cage, a fish number calculation device, a fish number calculation program, a fish number measurement method and a fish number measurement system for measuring the number of fish in a cage.

The technique disclosed in Patent Document 1 is known as a conventional technique. In Patent Literature 1, a cylindrical body, which is a guide through which fish pass, and a detection electrode attached to the cylindrical body are used. When a fish passes through the cylinder, the potential of the detection electrode changes, and the counting section detects the change in potential and counts.

Japanese Patent Application Laid-Open No. 2005-78108

However, the prior art has a problem that the number of fish cannot be measured unless all the fish in the cage pass through the cylinder. Therefore, an object of the present invention is to make it possible to determine the number of fish, which is the number of fish, based on information obtained while the fish are swimming in a fish cage.

In this specification, the state corresponding to the state where there are no fish in the cage is defined as the reference state, the time when the number of fish in the cage is known is defined as the initial state, and the time when the number of fish in the cage is investigated is defined as the time of investigating the number of fish. In addition, N ₀ is the number of fish in the initial state, V ₀ is the value proportional to the average volume of fish in the initial state, and the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes installed in the fish cage. C dif0 is the value corresponding to C _dif0 , V ₁ is the value proportional to the average volume of the fish at the time of the fish number survey, and C _dif1 is the value corresponding to the difference between the capacitance between the measurement electrodes at the time of the fish count survey and the reference state. do.

The fish number calculation device of the present invention calculates the number of fish, which is the number of fish in the cage. The tail number calculation device includes at least a recording unit and a tail number calculation unit. The recording unit records the value ΔC related to the amount of change in capacitance obtained as ΔC=C _dif0 /(N ₀ ·V ₀ ). The number _- of-tails calculation unit calculates the number of tails N1 at the time of surveying the number of tails as _{N1=Cdif1 / (} ΔC·V1).

The fish number measuring system of the present invention measures the fish number, which is the number of fish in the cage. The fish number measurement system includes a set of measurement electrodes installed in the pen, a capacitance measuring device that measures the capacitance between the measurement electrodes, a recording unit, a variation calculation unit, and a fish number calculation unit. A computing device is provided. The change amount calculation unit calculates a value ΔC related to the amount of change in capacitance such as ΔC=C _dif0 /(N ₀ V ₀ ) based on the result measured by the capacitance measurement device, and stores it in the recording unit Record. The number-of-tails calculation unit calculates the number of tails N ₁ during the number-of-tails survey as N ₁ =C _dif1 /(ΔC·V ₁ ) based on the results measured by the capacitance measuring device.

The capacitance between the measurement electrodes can be measured while the fish is swimming in the fish tank. Also, the value proportional to the average volume is information that can be obtained even when the fish are swimming in a fish tank. According to the tail number measuring system of the present invention, the number of fish can be measured while the fish are swimming in the fish tank. Further, according to the tail number calculation device of the present invention, the number of fish can be obtained from the information obtained while the fish are swimming in the fish tank.

The figure which shows the structural example of the number-of-fishes measuring system of this invention. The figure which shows the image of the number-of-fishes measuring system of this invention. The figure which shows the structural example of the number-of-tails calculation apparatus of this invention. FIG. 10 is a diagram showing a processing flow of a method for measuring the number of fish according to the first embodiment; The figure which shows the processing flow of the number-of-fishes measuring method of a modification. The figure for explaining the outline of the simulation. The figure which shows the simulation result assuming the fish of the shape like a tuna. The figure which shows the simulation result assuming an elongated fish. The figure which shows the simulation result assuming the fish of a thick and short shape.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail. Components having the same function are given the same number, and redundant description is omitted.

FIG. 1 shows a configuration example of the fish number measuring system of this embodiment, and FIG. 2 shows an image of the fish number measuring system of this embodiment. FIG. 3 shows a configuration example of the number-of-tails calculation device of this embodiment. FIG. 4 shows the processing flow of the method for measuring the number of fish according to this embodiment. In this specification, the state corresponding to the state where there are no fish in the cage 900 is defined as the reference state, the time when the number of fish in the cage 900 is known is defined as the initial state, and the time when the number of fish within the cage 900 is investigated is defined as the time of investigating the number of fish. In addition, N ₀ is the number of fish in the initial state, V ₀ is the value proportional to the average volume of fish in the initial state, and the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes installed in the fish cage. C dif0 is the value corresponding to C _dif0 , V ₁ is the value proportional to the average volume of the fish at the time of the fish number survey, and C _dif1 is the value corresponding to the difference between the capacitance between the measurement electrodes at the time of the fish count survey and the reference state. do. "A state corresponding to a state in which there are no fish in the pen 900" includes not only a state in which there are no fish in the pen 900, but also a state in which the capacitance between the measurement electrodes is equivalent to a state in which there are no fish in the pen 900. I'm in. "A value proportional to the average volume of fish" includes not only the average volume of fish but also a value proportional to the volume, such as the cube of any one of length, height, and width. The “value corresponding to the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes” means the difference in the voltage indicating the capacitance output from the capacitance measurement device 300, It also includes the difference between values that are discretely digitized like digital signals.

The diameter of the fish preserve 900 at sea level is several tens of meters (for example, 40 meters), and the depth is several meters to several tens of meters. A set of measurement electrodes 200 is installed in the pen 900 . The measurement electrodes 200 may also have a diameter of several tens of meters and an interval of several meters to several tens of meters. In FIG. 2, it is installed in the vertical direction of the fish pen 900, but it may be installed in the horizontal direction. For example, if it is a rectangular fish tank, it is considered easier to install it in the horizontal direction. It should be noted that the surface of the measurement electrode 200 is covered with an insulator because it is desirable that the measurement electrode 200 is insulated from seawater.

The fish number measurement system 10 measures the fish number, which is the number of fish in the cage. The fish number measurement system 10 includes a set of measurement electrodes 200 installed in a fish tank 900, a capacitance measurement device 300 that measures the capacitance between the measurement electrodes 200, a recording unit 190, and a change amount calculation unit 110. A tail number calculation device 100 having a tail number calculation unit 120 is provided. Note that the technology disclosed in Japanese Patent Application Laid-Open No. 2011-214923 or the like may be used for the capacitance measuring device 300 .

Based on the result measured by the capacitance measuring device 300, the change amount calculation unit 110 calculates and records a value ΔC related to the amount of change in capacitance, such as ΔC=C _dif0 /(N ₀ V ₀ ). It is recorded in the section 190 (S110). Based on the result of measurement by the capacitance measuring device 300, the tail number calculation unit ₁₂₀ calculates the tail number N1 at the time of the tail number survey as _{N1=Cdif1 / (} ΔC·V1) (S120). Note that the number-of-tails calculation device 100 does not need to include the amount-of-change calculation unit 110 as long as the value ΔC calculated in advance is recorded in the recording unit 190 . The tail number calculation device 100 may be operated in conjunction with the capacitance measuring device 300 or the like as a part of the tail number measurement system 10, or the previously acquired tail number N ₀ , value V ₀ , value C _dif0 , value V ₁ , the tail number calculator 100 may be used alone, using the value C _dif1 .

The processing flow of the tail number measurement method and the tail number measurement system will be described with reference to FIG. First, the capacitance measurement device 300 measures and records the value _CS corresponding to the capacitance between the measurement electrodes 200 in a reference state in which there are no fish in the fish preserve 900 (S310: reference state). measurement step). The value CS may be recorded in the recording unit ₁₉₀ of the tail number calculation device 100, but may be recorded in another recording medium. Next, the size of the fish to be put into the cage 900 is confirmed, the number of fish N ₀ and the value V ₀ proportional to the average volume are obtained, A value _C0 corresponding to the capacitance is measured (S320: initial state measurement step). The value V ₀ proportional to the average volume is, for example, the average value of the unit values in which the length and area of each fish are measured using a sensor such as a camera, sonar, and infrared sensor, and the unit is the cube of the length. is obtained as the value _V0 . However, it is not limited to the method using these sensors, and may be obtained by some other method. Then, the value ΔC related to the amount of change in capacitance is ΔC=C _dif0 /(N ₀ V ₀ )
However, C _dif0 =C ₀ -C _S
is obtained and recorded (S110: change amount calculation step). The change amount calculation step S110 may be performed by the change amount calculation unit 110 of the tail number calculation device 100 and recorded in the recording unit 190 . However, you may calculate using another computing device. Note that the change amount calculation step S110 may be performed before the fish count calculation step S120, which will be described later, and thus may be performed after the fish count measurement step S330.

When investigating the number of fish in the cage 900 (at the time of investigating the number of fish), a value V1 proportional to the _average volume of fish in the cage 900 is acquired, and the capacitance measurement device 300 measures the distance between the measurement electrodes 200. _A value C1 corresponding to the capacitance is measured (S330: step of measuring the number of fish). _The method of obtaining the value _V1 may be the same as the method of obtaining the value V0, or may be another method. Then, in the tail number calculation unit 120, the tail number N ₁ at the time of the tail number survey is N ₁ =C _dif1 /(ΔC·V ₁ )
However, C _dif1 =C ₁ -C _S
(S120: tail number calculation step). The value ΔC may be recorded in advance in the recording unit 190 of the tail number calculation device 100 . Alternatively, the value C _dif1 may be input to the tail number calculation device 100, or the tail number calculation unit 120 may also calculate C _dif1 =C ₁ -C _S with the input as the value C ₁ . It should be noted that the processing performed by the tail number calculation device 100 in steps S310 to S330 may be executed by installing a tail number calculation program in a computer, or may be performed by a person using a general-purpose calculation program such as a spreadsheet program. may be executed.

The step S330 for measuring the number of fish when investigating the number of fish and the step S120 for calculating the number of fish may be repeated any number of times when the number of fish in the pen 900 is desired to be investigated. The capacitance between the measurement electrodes 200 can be measured while fish are swimming in a fish tank. Also, the value proportional to the average volume is information that can be obtained even when the fish are swimming in the fish tank 900 . Therefore, according to the fish number measuring method and the fish number measuring system 10 of this embodiment, the number of fish can be measured while the fish are swimming in the pen 900 . Further, according to the fish number calculation method and the fish number calculation device 100 of the present embodiment, the number of fish can be obtained from the information obtained while the fish are swimming in the pen 900 .

[Modification]
FIG. 1 shows a configuration example of the fish number measuring system of this modified example, and FIG. 2 shows an image of the fish number measuring system of this modified example. FIG. 3 shows a configuration example of the number-of-tails calculation device of this modified example. FIG. 5 shows the processing flow of the method for measuring the number of fish according to this modification. This modification differs from the first embodiment in that one set of reference electrodes 210 is used.

As in Example 1, a set of measurement electrodes 200 is installed in the fish preserve 900 . In FIG. 2, it is installed in the vertical direction of the fish preserve 900, but it may be installed in the lateral direction. The reference electrode 210 may be installed in water near the measurement electrode 200 within a range where it is not affected by the measurement electrode 200 . The reference electrode 210 may be installed outside the pen 900 or may be installed in a place in the pen 900 where there are no fish. The capacitance of the parallel plate capacitor is proportional to the area of the plates and inversely proportional to the distance between the plates. Theoretically, the capacitance between the reference electrodes 210 and the capacitance between the measurement electrodes 200 can be made the same by setting the distance to 1/10 of the spacing of 200 . Although 1/10 is used in the above example, other values may be used. When the reference electrode 210 is used, there is a risk of errors due to differences from the actual measurement electrodes 200, but errors due to changes in the salinity of seawater and changes in seawater temperature are less likely to occur. It should be noted that both the measurement electrode 200 and the reference electrode 210 are desirably insulated from the seawater, so the surface may be covered with an insulator.

The fish number measuring system 11 of this modified example measures the number of fish, which is the number of fish in the cage. The fish number measurement system 11 includes a set of measurement electrodes 200 installed in the pen 900, a set of reference electrodes 210 installed in the vicinity of the measurement electrodes 200, the capacitance between the measurement electrodes 200 and the reference electrodes. A capacitance measuring device 301 for measuring a value corresponding to a difference in capacitance between 210 , and a tail number calculating device 101 having a recording unit 190 , a variation calculating unit 111 , and a tail number calculating unit 121 . For the capacitance measuring device 301, the technique disclosed in Japanese Patent Application Laid-Open No. 2011-214923 may be used. The electrostatic capacitance between the reference electrodes 210 is adjusted or corrected so that it falls within a predetermined error range, with the electrostatic capacitance between the measurement electrodes 200 when there are no fish in the fish preserve 900 as a target value. You should leave it. “Adjustment” means fine adjustment of the spacing of the reference electrodes 210 and the like. "Correction" means correction on an electric circuit or correction on a program. For example, the capacitance is corrected by connecting a variable capacitor in parallel with the reference electrode 210, or the correction value is set in the program in the capacitance measuring device 301. The "predetermined error" may be appropriately set based on the allowable error in measuring the number of fish.

The capacitance measuring device 301 measures a value C _dif0 corresponding to the difference between the capacitance between the measurement electrodes 200 and the capacitance between the reference electrodes 210 in the initial state. The change amount calculation unit 111 calculates a value ΔC related to the amount of change in capacitance as ΔC=C _dif0 /(N ₀ V ₀ ) based on the measurement result of the capacitance measurement device 301, and outputs the value ΔC to the recording unit. 190 (S111). Also during the number of fish, the capacitance measuring device 301 measures the value C _dif1 corresponding to the difference between the capacitance between the measurement electrodes 200 and the capacitance between the reference electrodes 210 . Based on the measurement result of the capacitance measuring device 301, the tail number calculation unit ₁₂₁ calculates the tail number N1 at the time of the tail number survey as _{N1=Cdif1 / (} ΔC·V1) (S121). Note that the number-of-tails calculation device 101 does not need to include the change amount calculation unit 111 as long as the value ΔC calculated in advance is recorded in the recording unit 190 . The tail number calculation device 101 may be operated in conjunction with the capacitance measuring device 301 or the like as a part of the tail number measurement system 10, or the previously acquired tail number N ₀ , value V ₀ , value C _dif0 , value V ₁ , the number-of-tails calculator 101 may be used alone, with the value C _dif1 .

The processing flow of the tail number measurement method and the tail number measurement system will be described with reference to FIG. First, the electrostatic capacitance between the reference electrodes 210 is adjusted or corrected so that it falls within a predetermined error range, with the electrostatic capacitance between the measurement electrodes 200 in the state where there are no fish in the fish preserve 900 as a target value. (S210: reference electrode adjustment step). Next, the size of the fish to be put into the cage 900 is confirmed, the number of fish N ₀ and the value V ₀ proportional to the average volume are acquired, and the capacitance measurement device 301 is used to measure the initial state between the measurement electrodes 200. A value C _dif0 corresponding to the capacitance difference between the capacitance and the reference electrode 210 is measured (S321: initial state measurement step). Then, the value ΔC related to the amount of change in capacitance is ΔC=C _dif0 /(N ₀ V ₀ )
is obtained and recorded (S111: change amount calculation step). The change amount calculation step S111 may be performed by the change amount calculation unit 111 of the tail number calculation device 101 and recorded in the recording unit 190 . However, you may calculate using another computing device. Note that the change amount calculation step S111 may be performed before the tail count calculation step S121, which will be described later, and may be performed after the tail count measurement step S331.

When it is desired to investigate the number of fish in the cage 900 (when investigating the number of fish), a value V1 proportional to the _average volume of fish in the cage 900 is obtained, and the capacitance measurement device 301 measures the distance between the measurement electrodes 200. A value C _dif1 corresponding to the difference in capacitance between the capacitance and the reference electrode 210 is measured (S331: step of measuring the number of tails). _The method of obtaining the value _V1 may be the same as the method of obtaining the value V0, or may be another method. Then, in the tail number calculation unit 121, the tail number N ₁ at the time of the tail number survey is N ₁ =C _dif1 /(ΔC·V ₁ )
(S121: tail number calculation step). The value ΔC may be recorded in advance in the recording unit 190 of the tail number calculation device 101 . It should be noted that the processes performed by the tail number calculation device 101 in steps S210 to S331 may be executed by installing a tail number calculation program in a computer, or may be executed by a person using a general-purpose calculation program such as a spreadsheet program. may be executed.

The step S331 for measuring the number of fish when investigating the number of fish and the step S121 for calculating the number of fish may be repeated any number of times when the number of fish in the pen 900 is desired to be investigated. The capacitance between the measurement electrodes 200 can be measured while fish are swimming in a fish tank. Also, the value proportional to the average volume is information that can be obtained even when the fish are swimming in the fish tank 900 . Therefore, even with the fish number measuring method and the fish number measuring system 11 of this modified example, the number of fish can be measured while the fish are swimming in the pen 900 . Also, with the fish number calculation method and the fish number calculation device 101 of the present modified example, the number of fish can be obtained from the information obtained while the fish are swimming in the pen 900 . Further, as described above, the use of the reference electrode 210 makes it difficult for errors to occur due to changes in the salinity of seawater and changes in seawater temperature.

<Simulation>
In the above-described tail number calculation method, tail number calculation device, tail number measurement method, tail number measurement system, and tail number calculation program, the following formula ΔC = C _dif0 / (N ₀ V ₀ )
N1= _{Cdif1 /} (ΔC· _V1 )
is used to obtain the _number of tails N1. These equations are based on the assumption that the change in capacitance between the measuring electrodes 200 is dependent on the fish volume. Since the capacitance is proportional to the dielectric constant, intuitively, the change in capacitance per unit volume when the volume N ₀ ·V ₀ between the measurement electrodes 200 changes from seawater to the dielectric constant of cultured fish There is a hypothesis that the number of fish N ₁ can be obtained by obtaining the value ΔC corresponding to the amount of fish and dividing the value C _dif 1 corresponding to the change in capacitance by the value V ₁ corresponding to the average volume of fish and the value ΔC when investigating the number of fish. i think i get However, since the capacitance of a parallel plate capacitor is proportional to the area of the plates and inversely proportional to the spacing, the above formula is not accurate in a strict sense. Therefore, a simulation was performed to confirm whether the above formula can be used to actually calculate the number of fish. The simulation assumes that fish grow in a similar shape (constant ratio of length, width, and height).

FIG. 6 shows a diagram for explaining the outline of the simulation. FIG. 7 shows a simulation result assuming a fish shaped like a tuna, FIG. 8 shows a simulation result assuming a long and narrow fish, and FIG. 9 shows a simulation result assuming a thick and short fish. The measurement electrodes in FIG. 6 had an inter-electrode distance (interval) of 20 m, an electrode size of 200 mm long×200 mm wide×100 mm high, and the electrodes were covered with an insulator having a thickness of 5 mm. With 1 coulomb of electric charge accumulated between the measurement electrodes, one measurement electrode was set to 0 V and the voltage of the other measurement electrode was obtained to obtain the capacitance between the measurement electrodes. In FIG. 6, 81 (9×9) farmed fish of different sizes are shown. In the simulations shown in Figures 7 to 9, the position and number of cultured fish are selected in consideration of their size. In the simulation, the dielectric constant of the cultured fish part at the chosen location was changed from seawater to cultured fish.

In the simulations of Figures 7-9, the cylinder was turned sideways and used as a fish. Based on ×1.0, fish that are 1.2 times longer (×1.2), 1.4 times longer (×1.4), and 1.6 times longer (×1.6) are in the cage 900. I assume you are in

In the example of FIG. 7, there are the following four types of sizes.

×1.0: diameter 0.10m, length 0.5m
×1.2: diameter 0.12m, length 0.6m
×1.4: diameter 0.14m, length 0.7m
×1.6: diameter 0.16m, length 0.8m
In the example of FIG. 8, there are the following four types of sizes.

×1.0: diameter 0.040m, length 0.5m
×1.2: diameter 0.048m, length 0.6m
×1.4: diameter 0.056m, length 0.7m
×1.6: diameter 0.064m, length 0.8m
In the example of FIG. 9, there are the following four types of sizes.

×1.0: diameter 0.5m, length 0.1m
×1.2: diameter 0.6m, length 0.12m
×1.4: diameter 0.7m, length 0.14m
×1.6: diameter 0.8m, length 0.16m
In the measurement before fish insertion in FIGS. 7 to 9, the capacitance is obtained in a state without fish (reference state). Since the analysis conditions differ depending on the size of the cultured fish, the simulation results of the capacitance in the absence of fish are slightly different in FIGS. In the measurement at the time of input, 10 fish of size x1.0, 20 fish of size x1.2, and 10 fish of size x1.4 were introduced. The on-time measurement corresponds to the capacitance measurement in the initial state described above. Constant measurements 1 to 6 in FIGS. 7 to 9 show six examples set as examples of the number of fish survey. Then, the size distribution and number of farmed fish at the time of each fish count survey are set. The fact that the number of fish has decreased since the time of input is assumed that there are dead farmed fish.

The average volume and the number of tails calculated in the right column indicate the number of tails calculated according to the above formula. The average area and the number of tails calculated in the column to the right of it show the case where the average area was used instead of the average volume to calculate the number of tails. In addition, the average length and the number of tails calculated in the column to the right of it show the case where the number of tails was calculated using the average length instead of the average volume. This takes into account that capacitance is proportional to area and inversely proportional to length, so instead of using volume (unit of length cubed), use area (unit of length squared) or length. This is to confirm the results used.

From the results of FIGS. 7 to 9, it can be seen that the error is within 1 fish (within about 3%) when the number of fish is calculated by the above formula using volume. On the other hand, when using area and length, we can see that the number of tails is completely different. Therefore, it can be seen that the above formula using volume can be used substantially as a formula for calculating the number of fish, which is the number of fish in the cage. Therefore, the fish number measuring method and the fish number measuring system shown in the first embodiment and the modified example can measure the number of fish while the fish are swimming in the pen 900 . Further, the tail number calculation method and the tail number calculation device can obtain the number of fish based on information obtained while the fish are swimming in the pen 900 .

[Program, recording medium]
The various types of processing described above may not only be executed in chronological order according to the description, but may also be executed in parallel or individually according to the processing capacity of the device that executes the processing or as necessary. In addition, it goes without saying that appropriate modifications are possible without departing from the gist of the present invention.

Further, when the above configuration is implemented by a computer (processing circuit), the processing contents of the functions that each device should have are described by a program. By executing this program on a computer, the above processing functions are realized on the computer.

A program describing the contents of this processing can be recorded in a computer-readable recording medium. Any computer-readable recording medium may be used, for example, a magnetic recording device, an optical disk, a magneto-optical recording medium, a semiconductor memory, or the like.

Also, the distribution of this program is carried out by selling, assigning, lending, etc. portable recording media such as DVDs and CD-ROMs on which the program is recorded. Further, the program may be distributed by storing the program in the storage device of the server computer and transferring the program from the server computer to other computers via the network.

A computer that executes such a program, for example, first stores the program recorded on a portable recording medium or the program transferred from the server computer once in its own storage device. Then, when executing the process, this computer reads the program stored in its own recording medium and executes the process according to the read program. Also, as another execution form of this program, the computer may read the program directly from a portable recording medium and execute processing according to the program, and the program is transferred from the server computer to this computer. Each time, the processing according to the received program may be executed sequentially. In addition, the above processing is executed by a so-called ASP (Application Service Provider) type service, which does not transfer the program from the server computer to this computer, and realizes the processing function only by the execution instruction and result acquisition. may be It should be noted that the program in this embodiment includes information that is used for processing by a computer and that conforms to the program (data that is not a direct instruction to the computer but has the property of prescribing the processing of the computer, etc.).

Moreover, in this embodiment, the device is configured by executing a predetermined program on a computer, but at least a part of these processing contents may be implemented by hardware.

10, 11 fish number measurement system 100, 101 fish number calculation device 110, 111 variation calculation unit 120, 121 fish number calculation unit 190 recording unit 200 measurement electrode 210 reference electrode 300, 301 capacitance measurement device 900 fish tank

Claims (8)

A method for calculating the number of fish, which is the number of fish in a fish tank, comprising:
The state corresponding to the state where there are no fish in the cage is the reference state, the time when the number of fish in the cage is known is the initial state, and the time when the number of fish in the cage is investigated is the time of investigating the number of fish,
N ₀ is the number of fish in the initial state, V ₀ is the value proportional to the average volume of fish in the initial state, and the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes installed in the fish cage Let C _dif0 be the corresponding value, V ₁ be the value proportional to the average volume of the fish at the time of the fish count survey, and C _dif1 be the value corresponding to the difference in the capacitance between the measurement electrodes at the time of the fish count survey and the reference state. ,
The value ΔC related to the amount of change in capacitance is ΔC=C _dif0 /(N ₀ V ₀ )
A change amount calculation step to be obtained as
N ₁ = C _{dif1 / (ΔC V 1 )}
A tail number calculation step that calculates like
The number of tails calculation method to perform. A fish number calculation device for calculating the number of fish, which is the number of fish in a fish tank,
The state corresponding to the state where there are no fish in the cage is the reference state, the time when the number of fish in the cage is known is the initial state, and the time when the number of fish in the cage is investigated is the time of investigating the number of fish,
N ₀ is the number of fish in the initial state, V ₀ is the value proportional to the average volume of fish in the initial state, and the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes installed in the fish cage Let C _dif0 be the corresponding value, V ₁ be the value proportional to the average volume of the fish at the time of the fish count survey, and C _dif1 be the value corresponding to the difference in the capacitance between the measurement electrodes at the time of the fish count survey and the reference state. ,
ΔC=C _dif0 /(N ₀ ·V ₀ )
A recording unit that records the value ΔC related to the amount of change in capacitance obtained as
N ₁ = C _{dif1 / (ΔC V 1 )}
A tail count calculation unit that calculates like
A tail number calculation device comprising: A method for measuring the number of fish, which is the number of fish in a fish tank, comprising:
The state corresponding to the state where there are no fish in the cage is the reference state, the time when the number of fish in the cage is known is the initial state, and the time when the number of fish in the cage is investigated is the time of investigating the number of fish,
N ₀ is the number of fish in the initial state, V ₀ is the value proportional to the average volume of fish in the initial state, and the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes installed in the fish cage Let C _dif0 be the corresponding value, V ₁ be the value proportional to the average volume of the fish at the time of the fish count survey, and C _dif1 be the value corresponding to the difference in the capacitance between the measurement electrodes at the time of the fish count survey and the reference state. ,
a reference state measuring step of measuring a value _CS corresponding to the capacitance between the measurement electrodes when there are no fish in the fish preserve;
an initial state measurement step of measuring the _{value C0} corresponding to the capacitance between the measurement electrodes in the initial state and obtaining the number of tails _N0 and the value V0;
a tail number survey time measurement step of measuring _a value C1 corresponding to the capacitance between the measurement electrodes at the time of fish count survey and obtaining _a value V1;
The value ΔC related to the amount of change in capacitance is ΔC=C _dif0 /(N ₀ V ₀ )
However, C _dif0 =C ₀ -C _S
A change amount calculation step to be obtained as
N ₁ = C _{dif1 / (ΔC V 1 )}
However, C _dif1 =C ₁ -C _S
A tail number calculation step that calculates like
Counting method to perform. A method for measuring the number of fish, which is the number of fish in a fish tank, comprising:
The state corresponding to the state where there are no fish in the cage is the reference state, the time when the number of fish in the cage is known is the initial state, and the time when the number of fish in the cage is investigated is the time of investigating the number of fish,
N ₀ is the number of fish in the initial state, V ₀ is the value proportional to the average volume of fish in the initial state, and the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes installed in the fish cage Let C _dif0 be the corresponding value, V ₁ be the value proportional to the average volume of the fish at the time of the fish count survey, and C _dif1 be the value corresponding to the difference in the capacitance between the measurement electrodes at the time of the fish count survey and the reference state. ,
A set of reference electrodes is installed in the vicinity of the fish preserve,
a reference electrode adjustment step of adjusting or correcting the capacitance between the reference electrodes so that it falls within a predetermined error range from the capacitance between the measurement electrodes when there are no fish in the fish cage; ,
Initial state measurement for measuring the value C _dif0 corresponding to the difference between the capacitance between the measurement electrodes and the capacitance between the reference electrodes in the initial state, and obtaining the number of tails N ₀ and the value V ₀ a step;
a tail number investigation time measurement step of measuring a value C _dif1 corresponding to the difference between the capacitance between the measurement electrodes and the capacitance between the reference electrodes at the time of the tail _number investigation, and acquiring the value V1;
The value ΔC related to the amount of change in capacitance is ΔC=C _dif0 /(N ₀ V ₀ )
A change amount calculation step to be obtained as
N ₁ = C _{dif1 / (ΔC V 1 )}
A tail number calculation step that calculates like
Counting method to perform. A fish number measuring system for measuring the number of fish, which is the number of fish in a fish tank,
The state corresponding to the state where there are no fish in the cage is the reference state, the time when the number of fish in the cage is known is the initial state, and the time when the number of fish in the cage is investigated is the time of investigating the number of fish,
N ₀ is the number of fish in the initial state, V ₀ is the value proportional to the average volume of fish in the initial state, and the difference between the initial state and the reference state of the capacitance between a pair of measurement electrodes installed in the fish cage Let C _dif0 be the corresponding value, V ₁ be the value proportional to the average volume of the fish at the time of the fish count survey, and C _dif1 be the value corresponding to the difference in the capacitance between the measurement electrodes at the time of the fish count survey and the reference state. ,
the measurement electrode;
a capacitance measuring device for measuring the capacitance between the measurement electrodes;
a tail number calculation device having a recording unit, a change amount calculation unit, and a tail number calculation unit;
with
The change amount calculation unit
Based on the results measured by the capacitance measuring device,
ΔC=C _dif0 /(N ₀ ·V ₀ )
Calculate the value ΔC related to the amount of change in capacitance as in and record it in the recording unit,
The tail count calculation unit
Based on the results measured by the capacitance measuring device,
N ₁ = C _{dif1 / (ΔC V 1 )}
A tail number measurement system characterized by calculating as follows. The fish number measurement system according to claim 5,
Also provided is a set of reference electrodes placed in water,
The capacitance between the reference electrodes is adjusted or corrected so as to fall within a predetermined error range from the capacitance between the measurement electrodes when there are no fish in the fish cage,
The value C _dif0 is a value corresponding to the difference between the capacitance between the measurement electrodes and the capacitance between the reference electrodes in the initial state,
The fish number measurement system, wherein the value C _dif1 is a value corresponding to a difference between the capacitance between the measurement electrodes and the capacitance between the reference electrodes when the fish number is investigated. The fish number measurement system according to claim 6,
The number-of-tails measuring system, wherein the capacitance measuring device outputs data corresponding to a difference between the capacitance between the measurement electrodes and the capacitance between the reference electrodes. A tail number calculation program for causing a computer to function as the tail number calculation apparatus according to claim 2 .

Images