JP2002119202A - Method of killing treatment for big fish and big fish treated by the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve freshness of a fish meat and taste of a tuna pulled up to a fishing boat in suspended animation. SOLUTION: This method carries out the killing treatment by inserting a wire like tool 1 for killing treatment from the head 8 of a big fish such as a tuna or the like to the inside of the spine 6 in the suspended animation of the fish body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for killing large fish such as tuna and a large fish treated by the method.

[0002]

2. Description of the Related Art When large fish such as tuna are caught, it is necessary to kill and process the fish quickly and reliably in order to maintain the freshness of the fish. As a processing method suitable for such a killing process, a linear killing tool is inserted from the white crest portion of the head of the fish body or a cut surface of the head, reaches the inside of the spinal column, and destroys the central nervous tissue. Methods are conventionally known. In addition, by killing the above killing tool and leaving it in the fish after the processing, and confirming the processing tool in the market, it is possible to inform consumers and traders that the fish has been processed by the above method. It is also known to inform (Japanese Utility Model Publication No. 2-37757, Japanese Utility Model Publication No. 4-36624).
No., Japanese Utility Model Publication No. 4-55516).

[0003] The killing method described above is effective as a measure for avoiding the difficulty of handling due to the tuna and the like pulled up on a fishing boat in the longline fishing method,
Since death can be caused quickly, favorable results are obtained in maintaining freshness of meat quality. On the other hand, if the person is dead before being lifted on the fishing boat, he or she will not be violent, and therefore, is actually housed in a hold without performing the above processing.

[0004] A tuna that has not been subjected to the above-mentioned processing method because it is dead before being raised on a fishing boat, and a tuna that has been raised alive and has been subjected to the above-described processing method, are provided on the market after thawing. As a result, the freshness and taste of the fish meat having been subjected to the treatment are superior. For this reason, the fact is that there is a difference in the market price of tuna depending on the presence or absence of the processing.

[0005]

However, the tuna that cannot be lifted up on a ship and are not violent are not all dead, but various types such as those in a state of temporary death and those in a rigid state after death. The present invention relates to a preferable method for maintaining the freshness of fish meat and a large amount of tuna and the like killed by the processing method for those in a state of asphyxia except for those in a state of stiffness after death or more than that of those in a suspended state. It is an object to provide shaped fish.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a large-scale method in which a linear killing tool is inserted from the head of a fish body into the spine and the processing tool is left inside the spine. In the killing method for shaped fish, the killing process is executed in a state where the fish body is suspended.

When large fish such as tuna and the like in the state of asphyxia are subjected to the above-mentioned killing treatment, when the treatment tool passes through the spinal column, the fish body cramps violently, and the phenomenon that the epidermis changes to a fresh color is recognized. Can be For comparison, such a phenomenon is not observed even if the above-mentioned treatment is applied to a rigid body after death. The freshness and taste of fish meat are also good.

In the above-described processing, it is effective to insert the entire length of the spine. However, since it is not known from the outside whether or not the entire length of the spine is inserted, the following method is used to determine this. You can take the approach.

That is, first, one end of the killing device is exposed to the outside from the cut surface of the tail of the fish at the end of the killing process. Second, the killing is completed at the end of the killing process. A method of exposing one end of the processing tool to the outside through a cutout reaching the spine of the tail of the fish; and thirdly, at the end of the killing process, connect the other end of the killing processing tool to the white of the head of the fish. Method of exposing crest portion to outside, 4th
In addition, there is a method of exposing the other end of the killing tool to the outside from the cut surface of the head of the fish at the end of the killing process.

[0010] The large fish treated as described above is frozen with the treatment tool inserted, and is thawed and supplied to the market as it is.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The killing device 1 used in the first embodiment shown in FIG. 1 is obtained by cutting a linear synthetic resin (nylon, polypropylene, or the like) into a predetermined length corresponding to a large fish body 2. Its thickness is about 3 to 5 mm. A hollow tube may be used, but in this case, plugs are fitted at both ends.

There is a relatively flexible white crest in the middle part of both eyes of the large fish body 2 such as tuna. For a large fish pulled up on board, alive and in the state of asphyxia, a hole 4 is made in a part of the skull 3 by piercing or shaving the white crest of the fish body 2 with a knife. , And cut off the tail 5 again. The cut end of the spine 6 appears on the cut surface after the tail 5 has been cut off.

Next, one end of the killing tool 1 is inserted into the hole 4 and pushed forward to push the spine 6 from the inside of the skull 3.
Through the cut end on the tail 5 side to the outside.
By inserting the killing device 1, the central nervous tissue such as the brain and spinal cord of the fish body 2 is destroyed, and the fish body 2 can be completely killed quickly. Those in a state of asphyxia will experience severe convulsions and then death.

After the killing process is completed, one end 1a of the killing tool 1 is exposed to a required length from the cut surface of the tail 5 to the outside, and the other end 1b connected to the end 1a is removed. A required length is exposed to the outside through the hole 4 on the head 8 side, and both ends 1
a, 1b is exposed and frozen and then thawed before being shipped to the market. In the market, by confirming both ends 1a and 1b of the killing device 1, the head 8 is
It can be seen that the killing device 1 has been inserted over the entire length of.

Note that the tail 5 is not completely separated,
As shown in FIG. 1C, a notch 7 reaching the spine 6 may be provided, and the end 1 a may be exposed at the notch 7.

In another embodiment shown in FIG. 2, the head 8 is cut off at the portion including the skull 3 or slightly behind. Cutting and removing the tail 5 is the same as described above. Thereafter, the killing treatment tool 1 is inserted into the spine 6 appearing on the cut surface on the head 8 side, and penetrated to the cut surface on the tail 5 side. Also in this case, both ends 1a and 1b of the killing device 1 are respectively exposed to the outside from the both ends. Without cutting and removing the tail 5, the notch 7 may be provided as shown in FIG. 1D, and the end 1b may be exposed to the outside from the notch 7.

In this case, since the brain is removed or destroyed by cutting the head 8, the above-mentioned killer 1 destroys nerve tissues such as the spinal cord inside the spinal column 6 and quickly leads to complete death.

If it is guaranteed by some method that the treatment tool 1 is inserted through the entire length of the spine, the end 1b is exposed from the hole 4 of the head 8 as shown in FIG. Or just

[0019]

As described above, according to the present invention, a large fish such as tuna, which had not been subjected to any treatment since it was in a state of asphyxia when it was lifted up on a ship, has a line on its spine. By performing a killing process in which a killer is inserted, it is possible to improve the freshness and taste of large fish supplied to the market.

[Brief description of the drawings]

1A is a front view of an embodiment; FIG. 1B is a cross-sectional view taken along line bb in FIG. 1A; FIG. 1C is an enlarged cross-sectional view taken along line cc in FIG. Part front view

FIG. 2 is a front view of another embodiment.

FIG. 3 is a front view of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Kill processing tool 2 Fish body 3 Skull 4 Hole 5 Tail 6 Spinal column 7 Notch 8 Head

Claims (6)

[Claims] 1. A killing method for a large fish in which a linear killing tool is inserted into the spine from the head of the fish and the processing tool is left inside the spine, wherein the killing process is executed in a state of the fish suspended. A method for killing large fish. 2. The method for killing large fish according to claim 1, wherein one end of the killing tool is exposed to the outside from a cut surface of the tail of the fish body at the end of the killing process. 3. The large fish according to claim 1, wherein at the end of the killing process, one end of the killing device is exposed to the outside from a cutout portion reaching the spine of the fish tail. Kill processing method. 4. The fish killing device according to claim 1, wherein at the end of the killing process, the other end of the killing tool is exposed to the outside from a white crest portion of the head of the fish body. Large fish killing method. 5. A large-size apparatus according to claim 1, wherein at the end of the killing process, the other end of the killing tool is exposed to the outside from a cut surface of the head of the fish body. A killing method for shaped fish. 6. A large fish, which is killed by the method according to any one of claims 1 to 5, and is supplied to a market with the treatment tool inserted.