JP2007218831A - Fish monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fish monitoring system capable of detecting death of fish in a water tank by using simple devices and a simple detection method. <P>SOLUTION: The fish monitoring system is provided with the water tank 2, having both an outer wall 3 and an inner wall 4. The width of an inner wall 5 is substantially the same as the width W of the outer wall 4 and uniform size between P0-P1, narrowed from both sides between P1-P2 into a width d, in such a way as to draw an arc, and uniform in the width d between P2-P4 (where the length L of the outer wall 4 is a reference axis; the position of the outer wall 4 on the upstream side is P0; a center part of the outer wall 4 in the longitudinal direction is P1; the position of the outer wall 4 on the downstream side is P4; and points substantially equally dividing the section between P1-P4 into three are P2 and P3 from the upstream side). The bottom surface and a side surface of a partition plate 6, having a height lower than the inner wall 5 by one step are joined to the inner wall 5 at the position of P3 at the section surrounded by the inner wall 5. A photoelectric sensor 7, comprising both a light projector 7a and a light receiver 7b for detecting dead bodies of fish and dirt, etc. inside the water tank 2, is installed on the outer wall 4 at P2 and P3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fish monitoring system for monitoring fish in an aquarium.

In recent years, in order to investigate the safety of water pollution caused by harmful substances such as wastewater and agricultural chemicals, a water test method has been used to investigate the contamination of acute toxic substances by judging the life and death of fish in fish tanks. Yes. As a fish monitoring system used in such a water test method, the water to be evaluated is circulated in the aquarium, the fish accommodated in the aquarium is imaged using a video camera, etc. One that can be transmitted to a remote place via priority or the like is known (Patent Document 1). In addition, this fish monitoring system is equipped with a water temperature adjustment device for adjusting the water temperature to an arbitrary temperature and a filtration filter for removing rough debris in the water, near the inlet for water in the tank. The environment in the aquarium can be adjusted.
JP 2001-235463 A

  However, since the fish monitoring system disclosed in Patent Document 1 observes fish in the aquarium with captured images, an image analyzer must be used to automatically detect the death of fish. The analysis method becomes very complicated, such as performing time correlation of captured images.

  This invention is made | formed in view of such a point, and it aims at providing the fish monitoring system which can detect the death of the fish in an aquarium with a simple apparatus and a detection method.

  The fish monitoring system according to the present invention is configured such that the width of the other end side is narrower than the one end side, the water tank containing the monitoring fish together with the water, and the water stored in the water tank from one end side to the other end side of the water tank. Circulating means, a sensor arranged near the liquid level on the other end of the water tank as a detection area, and the output of the sensor is input to detect the presence of action-stopping fish in the detection area and to an external device And a control means for outputting a detection signal.

  According to the present invention, it is possible to easily detect the death of a fish by attaching a sensor to the detection unit by providing a detection unit with a flow path narrowed on the downstream side in the aquarium, and including a sensor in the detection unit. it can.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a front view of a fish monitoring system according to the first embodiment of the present invention. FIG. 2 is a plan view of the fish monitoring system.

  The wooden installation stand 1 has a storage space inside, and is provided with a door or the like for blindfold (not shown). A water tank 3 made of acrylic is placed on the installation table 1. The aquarium 3 is surrounded by an outer wall 4 so as to have a box shape with an upper surface opened, and has a double structure in which an inner wall 5 having the same height as the outer wall 4 is formed inside the outer wall 4. .

  On the upper surface of the water tank 3, a removable aluminum lower cover 22 and an upper cover 23 made of transparent acrylic are disposed on the lower cover 22. The lower lid 22 made of aluminum has openings 22a and 22b having substantially the same area as the breeding part A and the detection part B at positions corresponding to the upper surfaces of the breeding part A and the detection part B of the aquarium 3, which will be described later. It is provided. A support plate 27 made of acrylic that supports the lower lid 22 is passed to the bottom surface between the opening hole 22a and the opening hole 22b.

  The upper lid 23 is composed of two members, an upper lid 23-1 above the rearing part A described later and a lower lid 23-2 above the detection part B described later. A small hole 23a serving as a bait inlet is provided at a position substantially corresponding to the center of the part A, and a small hole 23b serving as a fish carcass outlet is provided at a position corresponding to the approximate center of the detection part B to the upper lid 23-2. ing. On the upper surfaces of the small holes 23a and 23b, slide type lids 24a and 24b are provided which slide and rotate so as to rotate about the pivots 25a and 25b, respectively. A plurality of air holes (not shown) are formed in the upper lid 23 made of acrylic.

  FIG. 3 is a plan view of the fish monitoring system with the lower lid 22 and the upper lid 23 removed.

  The inner wall 5 is formed so that the width varies depending on the length direction. Here, the left hand side of the paper surface is defined as an upstream side, which will be described later, and the right hand side of the paper surface is defined as the downstream side. Using the length L of the outer wall 4 as a reference axis, the position of the outer wall 4 on the upstream side is P0, the central portion in the length direction of the outer wall 4 is P1, the position of the outer wall 4 on the downstream side is P4, and further between P1 and P4 If the points to be divided into about three equal parts are P2 and P3 from the upstream side, the width of the inner wall 5 is substantially the same as the width W of the outer wall 4 from P0 to P1, and the width d from P1 to P2 It gradually narrows from both sides so as to draw a gentle arc until it becomes, and the width d from P2 to P4 is constant. Furthermore, a partition plate 6 that is one step lower than the inner wall 5 is joined to the inner wall 5 at the bottom and side surfaces at a position P3 surrounded by the inner wall 5. Here, in the part surrounded by the inner wall 5, the area P0 to P3 is a breeding part A, the area P2 to P3 is a detection part B, and the area P3 to P4 is an overflow pit C.

  On the front surface of the inner wall 5, a projector 7 a of the photoelectric sensor 7 is provided at a position of P 2 to P 3 and at the height of the partition plate 6, and on the rear surface of the inner wall 5 facing the projector 7 a, the projector 7 a A light receiver 7b for receiving the light is installed. As shown in FIG. 6, this photoelectric sensor 7 is electrically connected to a control device 8 provided in the storage space of the installation table 1, and the detection signal of the photoelectric sensor 7 has a timer circuit inside. Is output to the control device 8 provided.

  A water supply port 9 for supplying water is provided near the upstream side P0 on the bottom surface of the water tank 3, and a water supply pipe 10 is inserted into the breeding part A from the bottom surface of the water tank 3 through the water supply port 9. Yes. Further, the water supply pipe 10 is provided with a water supply nozzle 11 having a plurality of water supply holes 11a in the width direction at the tip, and a water supply valve 10a for adjusting the amount of water supply is provided in the middle part. Further, on the bottom surface of the water tank 3, a drain port 12 is provided in the vicinity of P1, and an overflow drain port 13 described later is provided between P3 and P4 surrounded by the inner wall 4. The drainage port 12 and the overflow drainage port 13 are respectively connected to a drainage pipe 14 and an overflow drainage pipe 15 provided in the storage space of the installation table 1. The drain pipe 14 is provided with a drain valve 14a for adjusting the amount of drainage. Here, the water supply pipe 10 and the overflow drain pipe 15 are connected to a filtration layer 16 for filtering water provided inside the installation base 1, and the water is filtered by the pump 17 by driving the pump 17. → Water tank 3 → Overflow drain pipe 15 → Filter tank 16 In addition, an air ejector 26 that ejects air from the entire width W direction of the water tank 3 is provided on the bottom surface on the upstream side of the water tank 3.

  Next, the operation of the fish monitoring system configured as described above will be described.

  4 is a partial front view showing a state of using the apparatus, and FIG. 5 is a cross-sectional view taken along line A-A ′ of FIG. 4.

  Water is supplied from the water supply pipe 10 to the breeding part A at a constant amount Q through a water supply nozzle 11 that spreads in the width direction. The water supplied in this way flows through the breeding part A and overflows from the upper part of the partition plate 6 which is the lowest side wall surrounding the breeding part A by a certain amount Q. The overflowing water flows out into the overflow pit C and is drained from an overflow drain port 13 disposed on the bottom surface of the overflow pit C. When cleaning the breeding part A, the drainage valve 14a can be opened to drain the water from the breeding part A.

  In this way, the breeding part A in which water circulates is bred with fish 20. Here, when the fish dies in the breeding unit A, the fish carcass 21 floats near the water surface of the detection unit B, which is the downstream part of the breeding unit A. When the fish carcass 21 floats near the water surface, the photoelectric sensor 7 provided around the height of the partition plate 6 of the detection unit B detects the fish carcass 21 and outputs a detection signal to the control device 8. The control device 8 uses a timer circuit to determine whether the detection signal is input for a predetermined time or more, and outputs a signal to an external device when the detection signal is input for a predetermined time or more. This external device has a function of sounding a buzzer, etc., and notifies the manager etc. away from the fish monitoring system of the death of the fish.

  As described above, the present invention collects fish carcasses and garbage in the detection unit B by narrowing the width of the downstream portion of the inner wall 5 and easily installs the photoelectric sensor 7 near the water surface of the detection unit B. It is possible to detect the corpse 21 and garbage floating on the water surface.

  Moreover, since the partition plate 6 is installed in the full flow path width of the detection part B, the flow volume of water can be taken large, making the change of a water surface gentle.

  Furthermore, by providing a timer circuit in the control device 8, a detection signal is output to the external device only when the fish stays for a certain period of time or longer. It can be determined with a simple device.

  Furthermore, since the section from P1 to P2 of the inner wall 5 draws a gentle arc, vortices due to water flow are unlikely to occur, and it is possible to prevent the fish carcasses 21 from stopping in the vicinity of P1. Further, by providing the air ejector 26 on the upstream side of the water tank 3, the bubbles coming out of the air ejector 26 move together with the water flow, so that the fish carcasses 21 are easily transported to the detection unit B.

  In this embodiment, a transmissive photoelectric sensor composed of a projector and a light receiver is used, but a reflective photoelectric sensor may be used.

1 is a front view of a fish monitoring system according to an embodiment of the present invention. It is a top view of the same fish monitoring system. It is a top view of the state which removed the cover of the same fish monitoring system. It is a left view of the fish monitoring system. It is a partial front view which shows the mode at the time of the specification of the fish monitoring system. FIG. 5 is a cross-sectional view taken along the line A-A ′ of FIG. It is a block diagram of the same fish monitoring system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Installation stand, 3 ... Water tank, 4 ... Outer wall, 5 ... Inner wall, 6 ... Partition plate, 7 ... Photoelectric sensor, 8 ... Control apparatus, 9 ... Water supply port, 10 ... Water supply pipe, 11 ... Water supply nozzle, 12 ... Drain port, 13 ... overflow drain port, 14 ... drain pipe, 15 ... overflow drain pipe, 16 ... filtration tank, 17 ... pump, 20 ... fish, 21 ... carcass of fish, 22 ... lower lid, 23 ... upper lid, 24 ... Slide type lid, 25 ... pivot, 26 ... air ejector.

Claims (6)

A water tank in which the width of the other end side is formed narrower than the one end side and accommodates monitoring fish together with water;
A circulating means for circulating water contained in the water tank from one end side to the other end side of the water tank;
A sensor arranged as a detection region near the liquid surface on the other end side of the water tank;
A fish monitoring system comprising: control means for inputting the output of the sensor, detecting the presence of a behavior-stopping fish in the detection area, and outputting a detection signal to an external device. The circulating means is
A filtration tank for filtering water supplied into the water tank;
A pump for pumping water from the filtration tank;
A water supply pipe for supplying water pumped up to the one end side of the water tank;
The fish monitoring system according to claim 1, further comprising: a drain pipe for discharging water drained from the other end side of the water tank to the filtration tank. The water tank is provided with a partition wall lower than the height of the inner wall of the water tank on the other end side, and by this partition wall, an overflow pit into which water overflowing from the breeding tank flows into one end side and the other end side. 2 minutes,
The fish monitoring system according to claim 1, wherein the photoelectric sensor is installed in accordance with a height of the partition wall immediately before the partition wall of the breeding tank.   4. The fish monitoring system according to claim 3, wherein the water tank is formed such that a side wall forms a gentle arc from the breeding tank to the overflow pit. Air blowing means for supplying air bubbles into the water contained in the water tank;
The fish monitoring system according to claim 1, wherein the circulation unit circulates the bubbles together with the water from one end side to the other end side of the water tank.   2. The fish monitoring system according to claim 1, wherein the control unit outputs a detection signal to the external device when the presence of the action-stopping fish in the detection area is detected for a predetermined time.

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