JP4244362B1 - Treatment method for spinal cord injury in fish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the risk of life of a fish body with certainty without particularly experience or skill when damaging only the spinal cord while the fish is alive.
A processing jig 10 is inserted into the nerve arch 4 from the tail of a fish 1 to damage the spinal cord 5 near the medulla oblongata 7. At this time, care is taken not to push the spinal cord 5 together, so that the medulla and the brain are not compressed. When the special shape portion 10k on the tip side of the processing jig 10 is the first configuration example, the special shape portion 10k is inserted into the vicinity of the non-contacting position in the vicinity of the medulla and then the processing jig 10 is moved in the drawing direction. The spinal cord 5 nerve is damaged by the engaging portion g of the portion 10k, and in the case of the second configuration example of the special shape portion 10k, the spinal cord 5 nerve is damaged by the piercing effect by the sharp point e.
[Selection] Figure 4

Description

  The present invention relates to a technique for inhibiting a part of motor function by damaging the spinal nerves of live fish, for example, for facilitating the preservation and transport of live fish.

Conventionally, in order to facilitate the preservation and transportation of live fish, the applicant has stabbed the spinal cord close to the medulla of live fish with a pointed needle-like tool to suppress a part of motor function. In this technique, the position of the inside or outside of the lid of the fish near the side line or near the extension line is pierced with a needle-like tool with a sharp tip, and the tool is inserted. The tip is led to the spinal cord of the fish body, causing the spinal nerve to malfunction. (For example, see Patent Documents 1 and 2.)
On the other hand, after squeezing the fish, delay the stiffness after death and maintain freshness for a long time. A technique (for example, refer to Patent Document 3) such as suction removal from any one part of the body part, or a technique for extracting a nerve in the spine by ejecting fluid into the nerve arch from the cut portion of the posterior vertebrae ( For example, see Patent Document 4).
Furthermore, a technique for obtaining the piercing position of a blade using an image sensor when cutting the fish spinal cord with a blade is known (for example, see Patent Document 5).
Japanese Patent No. 3729844 Japanese Patent No. 3706879 JP 09-000146 A JP 07-264968 A JP 2000-4775 A

  By the way, as in Patent Documents 1 and 2, the technique of damaging the spinal nerves of live fish and suppressing a part of motor function is effective for safely transporting and storing live fish, This technique is extremely useful in providing fresh fish to consumers, but the technique of piercing the spinal cord near the medulla with a needle-like tool with a sharp tip is mistakenly Damage to the fish could cause the fish to die, and a certain amount of experience and skill were required to identify the piercing position. On the other hand, as shown in the “fish alive device” of Patent Document 5, a method for determining the piercing position of a blade using an image sensor when piercing and cutting the spinal cord of a fish with a blade is an equipment. There was a problem that it was expensive.

  Therefore, the present invention is a treatment method that suppresses the motor function by damaging the spinal cord of live fish. In particular, the spinal cord can be reliably damaged with little risk of fish life without experience or skill. The purpose is to enable processing at a low cost.

In order to achieve the above object, the present invention provides a treatment method in which the spinal cord of a live fish is damaged and the motor function is suppressed while it is alive, and the medulla is compressed from the tail of the fish into the nerve arch of the spine when inserted. After inserting a long and narrow bar-shaped processing jig with a special shape part that is difficult to form on the tip side, and inserting the special shape part at the tip of the processing jig to a predetermined position so as not to damage the medulla oblongata, The spinal cord was damaged by the special shape portion.

In this way, insert the processing jig into the nerve arch from the tail of the fish body, insert the special shape part provided at the tip of the processing jig to the predetermined position, and then damage the spinal cord with the special shape part Then, since the position far from the medulla is processed, there is no problem that causes fatal damage to the fish, and it can be constructed at low cost without any equipment costs.
In addition, from the viewpoint of suppressing the movement function of the whole body of the fish, the site that damages the spinal cord at the specially shaped part at the tip of the processing jig is preferably the spinal cord in the vicinity of the medulla as much as possible. Be careful not to damage the medulla oblongata as it may cause death. Also, when inserting the treatment jig into the nerve arch, if the spinal cord is pushed in at the same time, the medulla oblongata and brain may be compressed by the spinal cord, damaging the fish and dying, so be careful not to push the spinal cord. It is necessary to insert a jig.

Further, in the present invention, as the specially shaped portion on the distal end side of the processing jig, a rounded portion is formed at least on the distal end surface, and the jig is hooked on the spinal cord when the jig is moved to the distal peripheral surface portion in the pulling direction. In this way, an engaging portion that can damage the surface is formed.
By forming a rounded portion at least on the distal end surface of the processing jig in this way, when the processing jig is inserted into the nerve arch, it becomes slippery along the surface of the spinal cord and the spinal cord is pushed in and damages the medulla Can eliminate the fear of giving. In addition, when the jig is moved in the pull-out direction on the distal end side peripheral surface portion, an engagement portion that can be damaged by being hooked on the spinal cord is formed, so that the operation of damaging the spinal cord can be easily performed. become. In addition, when the jig is moved in the pulling direction, the engaging portion of the peripheral surface portion that can be damaged by being hooked on the spinal cord is, for example, a groove having a corner portion that is easily caught when being pulled out, or is easily caught when being pulled out. It is a stepped part.

Note that the specially shaped portion on the tip side of the processing jig may be a sharp portion with a sharp tip.
By making the tip sharply pointed in this way, when the processing jig is inserted into the nerve arch, even if it touches the spinal cord, the spinal cord only spreads outward and is not pushed forward, and the medulla oblongata The possibility of being pressed can be eliminated. In addition, the spinal cord portion in contact with the sharp portion can be partially damaged by the piercing effect.

Further, in the present invention, when the processing jig is inserted from the tail of the fish body, a cut is made in a part of the tail part of the fish body, or a local hole is made in a part of the tail part of the fish body so as to make a neural arch of the spine. Work was done so that the gate was visible.
In this way, by forming a cut or a local hole that can visually recognize the nerve arch of the fish tail vertebra, it is possible to reliably and accurately insert the processing jig into the nerve arch. Become.
In addition, it is said that there is no cerebral cortex that feels pain in fish, so it cannot be felt. Also, because fish is active in the water, even if a part of the body is damaged in the water, it is structured so that the blood coagulates in the water, so it is caused by bleeding unless it is a very fatal injury Does not lead to death. That is, it is a life form with high recovery ability.For example, even if a part of the vertebra is cut by cutting into the tail of the fish, or a part of the fish is removed together with the vertebra with a drill or the like, the state of the fish greatly changes. However, it has been confirmed that the body is resting in a stable state.

After inserting the processing jig into the nerve pylorus from the tail of the fish body of live fish, and inserting the special shape part of the shape provided at the tip of the processing jig and difficult to press the medulla to the predetermined position, If the spinal cord is damaged by the specially shaped portion, it can be processed safely even if the person to be treated does not have a special skill level, and the equipment cost is not incurred. At this time, as a special shape portion on the distal end side of the processing jig, at least a rounded portion is formed on the distal end surface, so that when the processing jig is inserted into the nerve arch, the spinal cord is pushed into the medulla oblongata. The risk of damaging the spinal cord can be eliminated by providing an engaging part that can be hooked and damaged when the jig is moved in the pull-out direction. You can do it.
In addition, by making a cut or a local hole in the fish tail so that the nerve arch of the spine can be seen, the operation of inserting the processing jig into the nerve arch can be performed reliably and accurately. It becomes like this.

Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is an explanatory view showing a state where a cut or a hole is made in a part of the tail of the fish body, FIG. 2 is an explanatory view of a first configuration example of a special shape portion at the tip of the processing jig, and FIG. FIG. 4 is an explanatory view of a fish skeleton, spinal cord, etc., FIG. 5 is an explanatory view showing an example of a processing method using a processing jig, and FIG. 6 is a hole in the tail. It is explanatory drawing which shows the example which attaches and preserve | saves a tag on both sides of a hole after that with respect to the fish which opened and processed.

  The fish spinal cord injury treatment method according to the present invention is a treatment method that suppresses the motor function by damaging the spinal cord of live fish. The spinal cord can be reliably damaged and can be processed at low cost, and is characterized by inserting and processing an elongated dedicated processing jig into the nerve arch of the spine from the tail of the fish.

Therefore, before describing the fish spinal cord injury treatment method of the present invention, an outline of a general fish skeleton, spinal cord, and the like will be described with reference to FIG.
In general, a fish 1 such as red sea bream or yellowtail has a spine 3 (spine) extending from the skull 2 as shown in FIG. 4, and the spine 3 is composed of an aggregate of a large number of vertebrae 3t. The spinal cord 5 passes through the nerve arch 1 on the back side of the vertebra 3t. The spinal cord 5 is generally connected to the medulla 7 located near the upper end portion of the elastic lid 6 (FIG. 1) and near the inner side of the elastic lid 6. 1 becomes an immediate death state.

  On the other hand, the present inventor in the above-mentioned Patent No. 3729844 and Patent No. 3706879 has a needle-like pointed tip at a position inside or outside of the lid 6 in the vicinity of the fish on the side line 8 or in the vicinity of the extension line. A technique has been proposed in which the tip of the tool is brought into the spinal cord 5 of the fish body by piercing with the tool, and the spinal nerve is dysfunctional. It is possible to almost completely lose the motor function of fish without damaging the basic ecological maintenance ability. In other words, although the fish are alive, they do not swim or rampage. For example, the equipment can be reduced in size and simplified for transportation and storage, and fresh fish in the live state. It is an epoch-making processing method that can be provided to consumers.

  However, in the above technique, it is necessary to pierce the portion of the spinal cord 5 as close as possible to the medulla oblong so as to cause dysfunction in the whole body of the fish body. If the medulla 7 is accidentally damaged, the fish 1 may be killed. was there. Moreover, experience and skill were necessary to process appropriately.

  Therefore, the present invention can damage the spinal cord 5 of the fish 1 with less risk of life of the fish without any particular experience or skill, and can reliably damage the spinal cord 5 and can be processed at low cost. In this way, an elongated dedicated processing jig 10 is inserted into the nerve arch 4 of the spine 3 from the tail of the fish body for processing.

  Accordingly, a specific example of the processing method of the present invention will be described. First, as shown in FIG. 1, a cut k is made in a part of the tail of the fish 1 (a) or a hole h is made (b). Thus, by allowing the nerve arch 4 of the vertebra 3 to be visually recognized, the subsequent processing can be easily performed even by an amateur.

  At this time, when processing the fish 1 taken out from the water on the work table, etc., it is necessary to stop the movement so that the fish 1 does not run out. It is preferable to place a holding mat or the like on 1 to prevent the fish from being damaged. Moreover, as a method for fixing the fish 1, it may be pressed by hand or may be pressed using a machine or the like.

  The position for making the incision k or opening the hole h assumes the internal structure and the position of the nerve arch 4 depending on the side line 8 of the fish 1, the width of the tail 9 and the state of the body. Determine the cutting position and drilling position.

When making the cut k, for example, using a tool such as a kitchen knife or a saw, cut out a part of the skin, meat, and bone so that the nerve arch 4 can be seen, and when making the hole h, Nerve arch 4 by punching out part of skin / meat / bone using a round or square blade, or cutting out part of skin / meat / bone using an electric drill or the like Can be made visible.
Of course, it is not an essential requirement to make the cut k, the hole h, or the like. The processing jig 10 is directly inserted into the nerve arch 4 from the tail side with reference to the position of the side line 8 or the position of the vertebra 3t. May be included.

  At this time, as described above, it is said that the fish 1 has no pain point and does not feel pain, and even if a part of the body is damaged in the water, the blood coagulates in the water. Due to the structure of the body, death due to bleeding will not occur unless it is a fatal injury. For this reason, even if the cut k is made in the fish tail and the vertebra is cut, or the hole h is made with a drill or the like, the fish maintains a stable state.

Next, as shown in FIG. 5, the processing jig 10 is inserted from the caudal nerve arch 1 to damage the spinal cord 3. The processing jig 10 will be described.
The processing jig 10 is an elongated rod-like member that can be inserted into the nerve arch 4 and, in this embodiment, is made of stainless steel that does not cause corrosion or the like, and is inserted into the nerve arch 4. In order to prevent the spinal nerves from being pushed together, the special shape portion 10k is formed at the tip.
Hereinafter, the special shape portion 10k will be described. First, as a first configuration example of the special shape portion 10k, as shown in FIG. 2, from the rounded portion r of the tip surface and the engaging portion g of the tip side peripheral surface portion. It is composed.

  In other words, although the spinal nerve of Fish 1 is structurally resistant to stretching to some extent, it is not structurally resistant to being naturally compressed when the nerve is pushed in and compressed. When the spinal nerves are pushed together, the medulla 7 connected to the tip of the spinal cord is pressed to lead to death, so that the rounded portion r makes it easy to slide along the spinal nerve when pushed, and the middle of the processing jig 10 The part is not provided with a portion having a large diameter so that a step that makes it easier to push the spinal nerve during insertion does not occur.

The engaging portion g is configured so as not to be caught on the spinal cord even when the processing jig 10 is moved in the pushing direction, and is easily hooked on the spinal cord 3 when moved in the pulling direction. For example, as shown in FIG. 2 (a), the tip portion is folded back via the rounded portion r at the tip, and the folded end portion is easily hooked as the engaging portion g, or FIG. ), It can be formed as a circumferential groove m having an engaging portion g which is not easily caught in the pushing direction and is easily caught in the drawing direction.
That is, in any case, when the processing jig 10 is inserted, there is no resistance to pushing the spinal cord 5, and when the processing jig 10 is moved in the pulling direction, the engaging portion g is caught by the spinal cord 5 and is damaged. I try to make it easier.

  When such a processing jig 10 is inserted into the nerve arch 4, the specially shaped portion 10 k is inserted as close as possible to the medulla 7 to damage the spinal cord 5 in the vicinity of the medulla 7. It is preferable. This is because the motor function of the whole fish body can be suppressed by damaging the spinal cord 5 at such a position. However, as described repeatedly, attention should be paid to the fact that damaging the medulla can cause death.

Next, a second configuration example of the special shape portion 10k at the tip of the processing jig 10 will be described with reference to FIG.
The special shape portion 10k is a sharp point e having a tapered tip, and when the processing jig 10 is inserted into the nerve arch 4, the spinal cord 5 exerts an outward force even when it contacts the spinal cord 5. Just receiving, it does not receive force in the pushing direction and there is no fear of pressing the medulla. Moreover, the portion of the spinal cord 5 in contact with the sharp point e is partially damaged by the piercing effect. In this case as well, it is preferable to insert the sharp point e to a position close to the medulla but care should be taken not to damage the medulla 7 itself.

Hereinafter, experimental examples will be described.
(Experimental example 1)
Using about 900 g of cultured red sea bream as a sample, a large cut k is made in the tail, a special processing jig 10 is inserted into the test arch 4, and the spinal cord 5 nerve is not pushed in. Was positioned near the medulla and then the treatment jig 10 was pulled forward to damage the spinal cord 5 nerve by the engaging portion g. When the spinal cord 5 was damaged and the fish body stopped moving, the processing jig 10 was pulled out and stored in a stabilization tank. When two days had passed, it was confirmed that Fish 1 was alive, and after checking the quality, the fish was squeezed and tasted with sashimi, and the quality was very good.

(Experimental example 2)
About 850 g of cultured red sea bream was used as a sample, and a hole h was drilled by an electric drill with a round blade attached to the tail. Since the fish 1 is quiet and the nerve arch 4 is visible from the cut hole h, a special processing portion 10k is inserted so that a dedicated processing jig 10 is inserted into the nerve arch 4 and the spinal cord 5 nerve is not pushed in. The spinal cord 5 nerve was damaged at the engaging portion g by stopping at a close position not in contact with the medulla and pulling the processing jig 10. When the movement of the fish body stopped, the processing jig 10 was pulled out, both sides of the opened hole h were sandwiched between tags 11 as shown in FIG. And it put into the water tank in this state, and stabilized the fish body. This fish 1 was put into a container containing 6 liters of sterile seawater, and it survived even after 2 days, so the seawater was changed and another 2 days passed. As a result of examining the quality of the sashimi, it was confirmed that it was of a good quality.

In addition, this invention is not limited to the above embodiments. Those having substantially the same configuration as the matters described in the claims of the present invention and having the same operational effects belong to the technical scope of the present invention.
For example, the material of the processing jig 10 is not limited to a stainless steel rod, and it is not an essential requirement to make a cut k or a hole h in the tail. Furthermore, the configuration of the special shape portion 10k is an example.

  When the spinal cord is damaged to suppress the motor function of fish, etc., it can be treated reliably without any special experience or skill, and it does not cost anything. It is expected to spread in a wide range in terms of providing it to consumers.

1A and 1B are explanatory diagrams showing a state in which a cut or a hole is made in a part of the tail of a fish body. Explanatory drawing of the 1st example of composition of the special shape part of the tip of a processing jig Explanatory drawing of the 2nd example of composition of the special shape part of the tip of a processing jig It is explanatory drawing, such as a skeleton of a fish, (a) is an overall view of the skeleton, (b) is an explanatory view of the abdominal vertebra, which is one of the vertebrae, viewed from the head side Explanatory drawing which shows an example of the processing method using a processing jig Explanatory drawing which shows the example which attaches a tag to both sides of a hole, and preserves it for the fish which processed by making a hole in the tail after that

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fish, 3 ... Spine, 4 ... Nervous arch, 10 ... Processing jig, 10k ... Special shape part, e ... Sharp part, r ... Earl part, g ... Engagement part.

Claims (4)

It is a treatment method that suppresses the motor function while damaging the spinal cord of live fish, and has a special shape part that is difficult to press the medulla when inserted into the nerve arch of the spine from the tail of the fish Insert a long and narrow rod-shaped processing jig formed on the tip side, insert the special shape part at the tip of the processing jig to a predetermined position so as not to damage the medulla, and damage the spinal cord with the special shape part A method for treating spinal cord injury in fish, characterized by comprising: The special shape part on the tip side of the processing jig is formed at least on the tip surface and on the tip side peripheral surface part, and when the jig is moved in the pulling direction, it is caught on the spinal cord and damaged. 2. The fish spinal cord injury treatment method according to claim 1, further comprising an engaging portion that can be provided. The fish spinal cord injury treatment method according to claim 1, wherein the specially shaped portion on the distal end side of the processing jig is a sharp portion with a sharpened tip. When inserting the processing jig from the fish tail, it is possible to visually recognize the nerve arch of the spine by making a cut in a part of the fish tail or by making a local hole in a part of the fish tail The fish spinal cord injury treatment method according to any one of claims 1 to 3, wherein the work is performed as described above.

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