Patent Description:
In general, electroencephalography (EEG), electromyography (EMG) or electrocardiography (ECG), which is a test method that evaluates the function of brain, muscles or heart by recording activity potential that is generated when brain is active, muscle fibers or heart contract, performs tests by sensing an electrical change in brain, muscles or heart.

As muscles are controlled by nerves and a fine current always flows through muscles, it is possible to determine whether muscles normally act including even peripheral nerves by checking the current through a needle or an electrode and recording the current using an electromyography system.

Accordingly, EMG is usually used when there is a problem with a peripheral nerve and a muscle, and particularly, and is used to find out the state of muscles that weakens muscles such as muscle atrophy and nerve disorders.

As described above, a bio signal measurement technology is used in various fields such as not only EMG, but also electrocardiography (ECG) and electroencephalography (EEG) that is a brain wave measurement.

Document <CIT> discloses an on-line fish electrocardiogram collecting method and an on-line fish electrocardiogram-collecting device based on the swimming state. Therefore, two collection electrodes are buried near the heart to collect fish's ECG signals.

Document <CIT> describes an aquaculture system, relating to a system for aquaculture, to be used in environments where the aquaculture system is exposed to the elements such as in an open ocean environment.

Document <CIT> is relating to an injection device for injecting a vaccine or the like into an injection body such as an animal, in particularly a fish.

Document <CIT> relates to a water-quality evaluation method and a system based on fish electrocardiogram indexes.

Recently, a technology that performs tests such as EMG, EEG, and ECG for a plurality of fish that have genetic information similar to that of human has been developed. For example, a system for performing EMG on Zebrafish, which is a vertebrate having genetic information similar to that of human, of a plurality of fish has been developed.

However, according to EMG systems for fish in the related art, it is difficult to simultaneously examine a plurality of fish and there is a trouble of inserting and fixing a fish into an agarose gel or a coil electrode.

Further, there are problems in the process of supplying medicines into a fish in the related art. The problems are described hereafter with reference to the following figure.

<FIG> is an exemplary view of a bio signal measuring device of fish according to the related art.

As shown in <FIG>, a bio signal measuring device of fish <NUM> of the related art needs to change an oral needle every time to change a medicine. For example, in order to provide a first medicine <NUM> to a fish F, it is required to put a first oral needle <NUM> connected to the first medicine <NUM> into the mouth of the fish F and then measure a bio signal through an electrode <NUM>. Thereafter, in order to provide a second medicine <NUM> to the fish F, it is required to pull out the first oral needle <NUM> and then connect the fish F to a second oral needle <NUM> connected to the second medicine <NUM>.

Since it was required to separate and change the oral needle connected to the fish F every time to change a medicine in the related art, it was required to modify the circuit connected to the oral needle that was grounded. Further, when switching the oral needles, it was difficult to fix the fish F and the electrode because the fish F falls or the attached electrode is detached. Further, as it was required to increase the numbers of packs keeping medicines and oral needles in proportion to the number of fish F, the test environment was complicated, causing mistakes frequently.

In order to solve the problems described above, an object of the present invention is to provide a bio signal measuring device of fish that can easily inject a necessary medicine into a plurality of fish and can easily fix the fish and electrodes during the change of medicines.

The objects to implement in the present invention are not limited to the technical problems described above and other objects that are not stated herein will be clearly understood by those skilled in the art from the following specifications.

In order to achieve the objects of the present invention, a bio signal measuring device of fish according to claim <NUM> is provided.

In an embodiment of the present invention, the fixing unit may have: a fixing main body forming a body; a fish seat formed on the top of the fixing main body so that the fish is fixed therein; and a needle seat formed in a hole shape, in which an oral needle may be inserted, in the front of the main body to communicate with the fish seat, and the fish seat may be formed in a groove shape corresponding to the shape of the fish so that the fish is fixed in an erected position.

In an embodiment of the present invention, the fixing unit may further have drains formed in both sides of the fixing main body, and the drain may discharge a medicine discharged from the gills of the fish to the outside from the main body.

In an embodiment of the present invention, the fixing unit may further have: a coupling groove formed at a side of the fixing main body; and a coupling protrusions formed at the other side of the fixing main body to be fitted in the coupling groove formed in another adjacent fixing main body, and the coupling groove and the coupling protrusion may maintain the gap between adjacent fixing main bodies.

In an embodiment of the present invention, the fixing unit may further have: a pad seat formed in the fixing main body in a groove shape that can fix an electrode pad of the electrode unit; and a wire hole formed in the rear of the main body to communicate with the pad seat, and the wire hole may be provided so that a wire connected to the electrode pad fixed in the pad seat is inserted therein.

In an embodiment of the present invention, the medicine storage unit may include a plurality of medicine storages keeping different medicines.

In an embodiment of the present invention, the bio signal measuring device of fish may further include a medicine valve unit disposed between the medicine storage unit and the medicine mixing unit, in which the medicine valve unit may include medicine valves disposed to correspond to the medicine storages, respectively, to control the amount of medicines to be supplied to the medicine mixing unit from the medicine storages and whether to supply medicines.

In an embodiment of the present invention, the medicine mixing unit may include: a medicine exchanger mixing the medicines provided from the medicine storage unit; and a plurality of medicine receivers disposed to correspond to the medicine storages, respectively, to provide the medicines in the medicine storages to the medicine exchanger.

In an embodiment of the present invention, the medicine distribution unit may include: a medicine distributor receiving the mixed medicine from the medicine mixing unit; and medicine distribution branches diverging from the medicine distributor to provide the mixed medicine to a plurality of fish, respectively.

In an embodiment of the present invention, the needle unit may be disposed between the medicine distribution unit and the fixing unit to correspond to the fixing unit.

In an embodiment of the present invention, the needle unit may include: an oral needle connected to the medicine distribution unit to receive a medicine and configured to be inserted into the mouth of the fish to inject a medicine; and a needle holder fixing the oral needle.

In an embodiment of the present invention, the needle holder may adjust a height and an insertion depth of the oral needle.

In an embodiment of the present invention, the bio signal measuring device of fish may further include a ground unit fixed to the oral needle.

In an embodiment of the present invention, the electrode unit may include: an electrode pad fixed to the fixing unit; and an electrode connected to the electrode pad to measure a bio signal of the fish.

Hereinafter, the present invention is described with reference to the accompanying drawings. However, the present invention may be modified in various different ways and is not limited to the embodiments described herein. Further, in the accompanying drawings, components irrelevant to the description will be omitted in order to obviously describe the present invention, and similar reference numerals will be used to describe similar components throughout the specification.

Throughout the specification, when an element is referred to as being "connected with (coupled to, combined with, in contact with)" another element, it may be "directly connected" to the other element and may also be "indirectly connected" to the other element with another element intervening therebetween. Further, unless explicitly described otherwise, "comprising" any components will be understood to imply the inclusion of other components rather than the exclusion of any other components.

Terms used in the present invention are used only in order to describe specific exemplary embodiments rather than limiting the present invention. It will be further understood that the terms "comprises" or "have" used in this specification, specify the presence of stated features, steps, operations, components, parts, or a combination thereof, but do not preclude the presence or addition of one or more other features, numerals, steps, operations, components, parts, or a combination thereof.

Hereinafter, embodiments are described in detail with reference to the accompanying drawings.

<FIG> is a picture of a bio signal measuring device of fish according to the present invention, and <FIG> are perspective views of a fixing unit of the bio signal measuring device of fish according to an embodiment of the present invention.

<FIG> is a plan view of the fixing unit of the bio signal measuring device of fish according to an embodiment of the present invention, and <FIG> is a side view of the fixing unit of the bio signal measuring device of fish according to an embodiment of the present invention.

<FIG> is an exemplary view showing the configuration of the bio signal measuring device of fish according to an embodiment of the present invention, and <FIG> is a picture of the fixing unit of the bio signal measuring device of fish according to an embodiment of the present invention.

As shown in <FIG>, a bio signal measuring device of fish <NUM> includes a fixing unit <NUM>, a medicine storage unit <NUM>, a medicine valve unit <NUM>, a medicine mixing unit <NUM>, a medicine distribution unit <NUM>, a needle unit <NUM>, a ground unit <NUM>, and an electrode unit <NUM>.

The fixing unit <NUM> is provided to fix fish and may be provided in several pieces. Although a first fixing unit <NUM>, a second fixing unit <NUM>, a third fixing unit <NUM> and a fourth fixing unit <NUM> are shown in the figures of the present invention, the number of the fixing units is not limited thereto. That is, a plurality of fixing units <NUM>, <NUM>, <NUM>, <NUM> may be provided and connected to each other in parallel, and the number of the fixing units <NUM>, <NUM>, <NUM>, <NUM> may be increased or decreased, if necessary, to simultaneously examine a plurality of fish F.

Hereafter, the configuration of the fixing unit <NUM> is described in detail on the basis of the first fixing unit <NUM> of the bio signal measuring device of the present invention.

The first fixing unit <NUM> have a fixing main body <NUM>, a fish seat <NUM>, a needle seat <NUM>, a drain <NUM>, a first coupling groove 1115a, a second coupling groove 1115b, a first coupling protrusion 1116a, a second coupling protrusion 1116b, a pad seat <NUM>, and a wire hole <NUM>.

The fixing main body <NUM> may form the body of the first fixing unit <NUM>. The fixing main body <NUM>, as shown in the figures, may have a rectangular parallelepiped shape, but is not limited thereto.

The fish seat <NUM> may be formed on the top of the fixing main body <NUM> so that the fish F can be fixed therein. In detail, the fish seat <NUM> may be provided by forming a groove in a shape corresponding to the shape of the fish F so that the fish F can be fixed in an erect position. Here, the fish F may be Zebrafish.

The needle seat <NUM> may be formed in a hole shape, in which an oral needle of the needle unit <NUM> can be inserted, in the front of the fixing main body <NUM> to communicate with the fish seat <NUM>.

That is, the needle seat <NUM> may be provided so that the oral needle inserted through the needle seat <NUM> is inserted into the mouth of a fish fixed in the fish seat <NUM>.

The drain <NUM> is formed at both sides of the fixing main body <NUM> to discharge the medicine discharged from the gills of the fish F to the outside from the fixing main body <NUM>.

The first coupling groove 1115a and the second coupling groove 1115b may be formed at a side of the fixing main body <NUM>.

The first coupling protrusion 1116a and the second coupling protrusion 1116b may be formed at the other side of the fixing main body <NUM> to be fitted in the coupling grooves formed in another adjacent fixing main body.

In detail, the first coupling protrusion 1116a may be formed in a shape corresponding to the first coupling groove 1115a and the second coupling protrusion 1116b may be formed in a shape corresponding to the second coupling groove 1115b. For example, the first coupling protrusion 1116a of the first fixing unit <NUM> is fitted in the first coupling groove of the adjacent second fixing unit <NUM> and the second coupling protrusion 1116b is fitted in the second coupling groove of the second fixing unit <NUM>, whereby the first fixing unit <NUM> and the second fixing unit <NUM> can be combined.

The coupling grooves and the coupling protrusions provided as described above can maintain the gap between adjacent fixing main bodies.

The pad seat <NUM> is formed in the fixing main body <NUM> in a groove shape that can fix a first electrode pad <NUM> of the electrode unit <NUM>.

The wire hole <NUM> may be formed in the rear of the fixing main body <NUM> to communicate with the pad seat <NUM>. The wire hole <NUM> provided as described above may be provided so that a wire connected to the first electrode pad <NUM> fixed in the pad seat <NUM> is inserted therein.

The medicine storage unit <NUM> can keep medicines to be supplied to the fish F fixed on the fixing unit <NUM>.

The medicine storage unit <NUM> may have a plurality of medicine storages keeping different medicines. For example, as shown in the figures, the medicine storage unit <NUM> may include a first medicine storage <NUM>, a second medicine storage <NUM>, a third medicine storage <NUM>, and a fourth medicine storage <NUM>, and different medicines can be kept in the respective medicine storages. However, the number of the medicine storages is not limited thereto.

Dissolved oxygen may be further included in the medicine kept in the medicine storage unit <NUM> so that the fish F can be kept alive by breathing even while bio signals of the fish F are measured.

For example, any one of the medicine storages of the medicine storage unit <NUM> keeps liquid containing dissolved oxygen to be able to keep supplying dissolved oxygen even while a medicine is not supplied to the fish F. The medicine storage unit <NUM> having this configuration can enable the fish F to keep breathing and alive when an examination is in progress or even when not.

The present invention described above can measure more accurate bio signals in comparison to measuring bio signals of a dead fish or dying fish by enabling the fish F to keep breathing.

The medicine valve unit <NUM> may be disposed between the medicine storage unit <NUM> and the medicine mixing unit <NUM>. The medicine valve unit <NUM> may be provided to correspond to the medicine storages one to one, thereby controlling the amount of medicines to be supplied to the medicine mixing unit <NUM> from the medicine storages and whether to supply medicines.

For example, a first medicine valve <NUM> may be disposed between the first medicine storage <NUM> and the medicine mixing unit <NUM> to control the amount of medicine to be supplied to the medicine mixing unit <NUM> from the first medicine storage <NUM> and whether to supply a medicine.

A second medicine valve <NUM>, a third medicine valve <NUM>, and a fourth medicine valve <NUM> may also be connected to the second medicine storage <NUM>, the third medicine storage <NUM>, and the fourth medicine storage <NUM>, respectively, to perform the same function as the first medicine valve <NUM>.

The medicine valve unit <NUM> having this configuration can make various medicines be more easily mixed by selectively opening/closing the medicine valves.

The medicine mixing unit <NUM> is provided to mix the medicines provided from the medicine storage unit <NUM> and includes a medicine exchanger <NUM>, a first medicine receiver <NUM>, a second medicine receiver <NUM>, a third medicine receiver <NUM>, and a fourth medicine receiver <NUM>.

The medicine exchanger <NUM> may be provided to mix the medicines provided from the medicine storage unit <NUM>.

The medicine receivers are provided to correspond to the medicine storage one to one to provide the medicines in the medicine storages to the medicine exchanger <NUM>.

For example, the first medicine receiver <NUM> is connected to the first medicine storage <NUM>, thereby being able to provide the medicine provided from the first medicine storage <NUM> to the medicine exchanger <NUM>.

The second medicine receiver <NUM>, the third medicine receiver <NUM>, and the fourth medicine receiver <NUM> may also be connected to the second medicine storage <NUM>, the third medicine storage <NUM>, and the fourth medicine storage <NUM>, respectively, to perform the same function as the first medicine receiver <NUM>.

The medicine distribution unit <NUM> is provided to receive the mixed medicine from the medicine mixing unit <NUM> and distribute the mixed medicine to a plurality of fish F, and may include a medicine distributor <NUM>, a first medicine distribution branch <NUM>, a second medicine distribution branch <NUM>, a third medicine distribution branch <NUM>, and a fourth medicine distribution branch <NUM>.

The medicine distributor <NUM> can be provided with the mixed medicine from the medicine mixing unit <NUM>.

The first medicine distribution branch <NUM>, the second medicine distribution branch <NUM>, the third medicine distribution branch <NUM>, the fourth medicine distribution branch <NUM> may diverge from the medicine distributor <NUM> to provide the mixed medicine to a plurality of fish F.

The needle unit <NUM> may be provided to inject the medicines distributed from the medicine distribution unit <NUM> to a plurality of fish F, respectively. The needle unit <NUM> is disposed between the medicine distribution unit <NUM> and the fixing unit <NUM> and may be provided as several pieces to correspond to the fixing units <NUM> one to one.

For example, a first needle unit <NUM> may be disposed between the first medicine distribution branch <NUM> and the fixing unit <NUM> to inject a medicine into the fish F fixed on the first fixing unit <NUM>.

A second needle unit <NUM>, a third needle unit <NUM>, and a fourth needle unit <NUM> may also be connected to the second fixing unit <NUM>, the third fixing unit <NUM>, and the fourth fixing unit <NUM>, respectively, to perform the same function as the first needle unit <NUM>.

In detail, the first needle unit <NUM> may include a first oral needle <NUM> and a first needle holder <NUM>.

The first oral needle <NUM> is connected to the medicine distribution unit <NUM> and provided with a medicine, and is inserted into the mouth of the fish F to inject the medicine into the fish F.

The first needle holder <NUM> may fix the first oral needle <NUM>. The first needle holder <NUM> may be provided to adjust the height of the fixed first oral needle <NUM>.

The first needle holder <NUM> may be provided to adjust the position of the first needle <NUM> in accordance with the distance from the mouth of the fish F.

The configuration of the first needle holder <NUM> is described in detail with reference to the following figures.

<FIG> is a perspective view showing a lower needle holder of a needle unit of the bio signal measuring device according to an embodiment of the present invention, <FIG> is a perspective view showing an upper needle holder of the needle unit of the bio signal measuring device according to an embodiment of the present invention, and <FIG> is a plan view showing the assembly of the fixing unit and the needle unit of the bio signal measuring device according to an embodiment of the present invention.

As shown in <FIG>, the first needle holder <NUM> may be formed by combining a lower needle holder 1612a and an upper needle holder 1612b.

The lower needle holder 1612a may have a lower fixing body <NUM>, lower fixing walls 1613a, a lower needle seat groove <NUM>, lower couplers <NUM>.

The lower fixing body <NUM> forms the body of the lower needle holder 1612a and may have a cuboid shape. However, the shape of the lower fixing body <NUM> is not limited thereto.

The lower fixing walls 1613a are disposed at the upper portion of the lower fixing body <NUM> and may extend toward the upper portion of the lower fixing body <NUM>. The lower fixing walls 1613a may be provided in a pair and spaced apart from each other at both sides of the upper portion of the lower fixing body <NUM>.

The lower needle seat groove <NUM> in which the first oral needle <NUM> can be seated may be formed between the pair of lower fixing walls 1613a.

The lower coupler <NUM> may extend toward the upper portion from the lower fixing walls 1613a.

The upper needle holder 1612b may have an upper fixing body <NUM>, upper fixing walls 1616a, an upper needle seat groove <NUM>, and upper coupling grooves <NUM>.

The upper fixing body <NUM> forms the body of the upper needle holder 1612b and may have a cuboid shape. However, the shape of the upper needle holder <NUM> is not limited thereto.

The upper fixing walls 1616a are disposed at the upper portion of the upper fixing body <NUM> and may extend toward the upper portion of the upper fixing body <NUM>. The upper fixing walls 1616a may be provided in a pair and spaced apart from each other at both sides of the upper portion of the upper fixing body <NUM>.

The upper fixing walls 1616a may be formed to correspond to the lower fixing walls 1613a so that the upper and lower fixing walls can be brought in contact with each other.

The upper needle seat groove <NUM> in which the first oral needle <NUM> can be seated may be formed between the pair of upper fixing walls 1616a. That is, the first oral needle <NUM> may be inserted and fixed in the lower needle seat groove <NUM> and the upper needle seat groove <NUM>.

The upper coupling grooves <NUM> may be formed in groove shapes in the upper fixing walls 1616a. The upper coupling grooves <NUM> may be formed in shapes at positions that enables the lower couplers <NUM> to be inserted and fixed therein. That is, the lower needle holder 1612a and the upper needle holder 1612b can be combined by coupling the lower couplers <NUM> and the upper coupling grooves <NUM>. In this case, the first oral needle <NUM> may be inserted and fixed in the lower needle seat groove <NUM> and the upper needle seat groove <NUM>.

The first needle holder <NUM> may further have a guide rail <NUM>.

The guide rail <NUM> may be coupled to connect the first needle holder <NUM> and the fixing main body <NUM> of the fixing unit <NUM>. The guide rail <NUM> can enable the first oral needle <NUM> coupled to the first needle holder <NUM> to move only straight at a height and a position that correspond to the needle seat <NUM>.

In detail, when inserting the first oral needle <NUM> fixed to the first needle holder <NUM> into the needle seat <NUM>, it is difficult to insert the first oral needle <NUM> into the small needle seat <NUM>.

However, when the guide rail <NUM> is used, the first needle holder <NUM> moves straight in the longitudinal direction of the guide rail <NUM> without laterally moving, so it is possible to easily adjust the insertion depth of the first oral needle <NUM> in the needle seat <NUM>.

Further, though not shown, the first needle holder <NUM> may further have a movement control mechanism that limits the movement distance when moving on the guide rail <NUM>.

In detail, the movement control mechanism can allow the first needle holder <NUM> to move a predetermined distance at a time and can fix the first needle holder <NUM> at the position when there is no additional operation. For example, a control mechanism having teeth may be disposed between the lower needle holder 1612a and the guide rail <NUM> so that the lower needle holder 1612a moves only by one step in accordance with the shape of the teeth every time it moves.

The movement control mechanism can make it easy to adjust the insertion depth of the first oral needle <NUM> in the mouth of the fish F.

The first needle holder <NUM> having the configuration describe above can allow for a stable examination by fixing the first oral needle <NUM> inserted in the fish F at appropriate height and depth.

Further, according to the present invention, the first needle unit <NUM> is fixed without a need for replacement and change even when the medicine storage unit <NUM>, the medicine valve unit <NUM>, the medicine mixing unit <NUM>, and the medicine distribution unit <NUM> are changed, so it is convenient.

The second needle unit <NUM> may also include a second oral needle <NUM> and a second needle holder <NUM> and the function thereof is the same as that of the first needle unit <NUM>.

The ground unit <NUM> can be grounded by being fixed to the oral needle. In detail, the first ground unit <NUM> is fixed to the first oral needle <NUM> and is grounded, and the first oral needle <NUM>, as described above, is fixed without a need for replacement even when a medicine is changed. Accordingly, there is no possibility of the mistake that a user forgets grounding after replacing an oral needle when replacing a medicine, so examinations can be stably performed.

The second ground unit <NUM> can be fixed to the second oral needle <NUM> and can be grounded. As described above, the ground unit <NUM> may be provided and fixed to correspond to each of the oral needles one to one.

The electrode unit <NUM> is configured to be attached to the fish F to measure bio signals of the fish F and may correspond to the fixing unit <NUM> one to one.

For example, the electrode unit <NUM> may include a first electrode unit <NUM>, a first electrode pad <NUM>, and a first electrode <NUM>.

The first electrode pad <NUM> may be fixed to the first fixing unit <NUM>. In detail, the first electrode pad <NUM> may be seated in the pad seat <NUM> of the first fixing unit <NUM>. A wire extending downward from the first electrode pad <NUM> may extend outside through the wire hole <NUM> from the pad seat <NUM> to be connected.

The first electrode <NUM> may be connected to the first electrode pad <NUM> and the fish F to measure bio signals of the fish F. In this state, since the fish F is fixed in the fish seat <NUM>, it is possible to easily fix the first electrode <NUM> and measure bio signals.

The second electrode unit <NUM> may also include a second electrode pad <NUM> and a second electrode <NUM> to perform the same function as the first electrode unit <NUM>.

As described above, since the present invention measures bio signals while keeping a fish F alive, it is possible to obtain an accurate examination result and it is possible to simultaneously measure bio signals with several fish F fixed.

Further, it was required in the related art to replace oral needles to replace medicines and modify the circuit grounded for the oral needles. Further, there was the inconvenience that a fish falls down or an electrode is separated when an oral needle is replaced. However, according to the present invention, since it is possible to replace medicines without changing the fixing unit <NUM>, the needle unit <NUM>, and the ground unit <NUM>, a quick examination is possible and the mistake of non-grounding can be prevented.

Further, in the related art, when the number of fish was increased, it was required to increase the numbers liquid packs and oral needles in proportion to the number of fish, so the examination environment was complicated and there were frequent mistakes. However, according to the present invention, there is no need for increasing the number of the medicine storages in correspondence to the number of fish F, so medicine can be saved, which is economical.

An effect of the present invention having the configuration described above is to be able to simultaneously measure bio signals of several fish.

It is not required to replace the oral needles every time to replace medicines and there is no possibility of making a mistake of not connecting the ground unit.

Since a medicine kept in one medicine storage is shared by several fish, it is possible to reduce consumption of medicines, which is economical.

The effects of the present invention are not limited thereto and it should be understood that the effects include all effects that can be inferred from the configuration of the present invention described in the following specification or claims.

The above description is provided as an exemplary embodiment of the present invention and it should be understood that the present invention may be easily modified in other various ways within the scope of the claims.

Therefore, the embodiments described above are only examples and should not be construed as being limitative in all respects. For example, the components described as single parts may be divided and the components described as separate parts may be integrated.

Claim 1:
A bio signal measuring device (<NUM>) for measuring bio signals of fish comprising:
a fixing unit (<NUM>) for fixing fish, wherein the fixing unit (<NUM>) comprises a fish seat (<NUM>) having a groove corresponding to the shape of the fish so that the fish is fixed therein;
an electrode unit (<NUM>) configured to be attached to the fish to measure a bio signal of the fish; characterized in that the bio signal measuring device further comprises:
a medicine storage unit (<NUM>) for storing medicines to be supplied to the fish fixed on the fixing unit (<NUM>), wherein the medicine storage unit (<NUM>) includes a plurality of medicine storages for storing different medicines, and one of the medicine storages keeps liquid containing dissolved oxygen to be supplied to the fish so that the fish is enabled to keep breathing and alive when an examination is in progress or even when not;
a medicine mixing unit (<NUM>) for mixing the medicines provided from the medicine storage unit (<NUM>);
a medicine distribution unit (<NUM>) for receiving the mixed medicines from the medicine mixing unit (<NUM>) and distributing the mixed medicines to each of a plurality of fish;
a needle unit (<NUM>) injecting the medicines distributed from the medicine distribution unit (<NUM>) to each fish, wherein the needle unit (<NUM>) comprises an oral needle connected to the medicine distribution unit (<NUM>) to receive the medicine and configured to be inserted into the mouth of the fish to inject the medicines.