JP2020099230A - Fish blood removal processing method - Google Patents

Abstract

To provide a fish blood removal processing method for providing whole fish which is reduced in fishy smell and excellent in freshness holding property.SOLUTION: There is provided a fish blood removal processing method, comprising the steps of: cutting a head and a belly of a fish 1 along an outer edge of a gill 14, for forming a slit SL for communicating a pericardial cavity 11 of the fish 1 with an external part of a fish body; implanting a tubular instrument 2 into a heart 17 of the fish 1 through the slit SL; fixing the tubular instrument 2 to the heart 17; and press-fitting a liquid into a blood circulatory system of the fish 1 through the tubular instrument 2 for discharging blood of the fish 1 to the external part of the fish body.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for blood removal processing of fish by pressurizing a liquid into a vascular system.

Blood in the fish body is the root of the fish's fishy odor and is one of the factors that promote the deterioration of freshness. Therefore, removing blood from the fish body is a very important task for maintaining the quality of the fish.

Conventionally, as a quality maintaining means for processed products obtained by processing fish for long-term storage such as frozen, dried fish, smoked fish, etc., blood removal treatment by pressurizing a liquid into the vascular system of fish has been performed (Patent Document 1). In this bleeding process, the blood in the blood vessel can be replaced with another liquid, so that the blood can be removed more reliably than the bleeding process in which the blood is simply caused to flow out from the cut blood vessel.

Here, the blood bleeding process of the fish by press-fitting the liquid into the conventional vascular system is performed on the premise that the fish is processed, so when inserting the tube for press-fitting the liquid into the vascular system, As shown in Reference 1, it was common knowledge to incise the abdomen of a fish. For this reason, fish with sufficient blood removal were not offered as round fish without internal organs removal.

However, the decrease in freshness of fish progresses immediately after landing, and even for whole fish that circulate within a short time after landing, a sufficient blood removal method should be used to reduce fishy odor and improve freshness retention. It has been demanded.

JP, 9-149761, A

The present invention has been made in view of such problems of the related art. One of the objects of the present invention is to provide a method for removing blood from a fish for providing a round fish with reduced fishy odor and excellent in freshness retention.

Means for Solving the Problems and Effects of the Invention

According to the method for blood removal treatment of fish according to the first aspect of the present invention, the head and the abdomen of the fish are cut along the outer edge of the gills to form the slits that communicate the pericardial cavity of the fish with the outside of the fish body. The step of inserting the tubular device into the heart of the fish through the slit, the step of fixing the tubular device to the heart, and the liquid being pressed into the vascular system of the fish through the tubular device. Accordingly, the step of discharging the blood of the fish to the outside of the fish body can be included. As a result, the state of the whole fish is maintained even if blood is sufficiently removed, so that it is possible to provide the whole fish with reduced fishy odor and excellent freshness retention.

Further, according to the method for removing blood from a fish according to the second aspect of the present invention, the flow rate of the liquid to be press-fitted is 1 L/min for a fish having a fish weight of 2 kg or less, and a fish weight of 2 kg or more and less than 5 kg. Can be set to 1.5 L/min, and the fish weight of 5 kg or more can be set to 2 L/min. As a result, blood can be efficiently discharged to the outside of the fish body while suppressing damage to the vascular system due to press-fitting of the liquid.

Furthermore, according to the method for removing blood from fish according to the third aspect of the present invention, the liquid to be press-fitted can have a hydrogen concentration in the range of 0.7 to 1.6 mg/L. As a result, hydrogen, which is an excellent reducing agent, spreads throughout the vascular system of the fish, so that the oxidation of tissues in the fish body is suppressed, and it is possible to provide a fish that is more excellent in freshness retention.

It is explanatory drawing of the structure of a hamachi, and the solid line shows the external appearance of a hamachi, and the broken line has shown the position and shape of the body cavity in the body of a hamachi. It is explanatory drawing of the 1st process in the Example of this invention which targets the yellowtail shown in FIG. It is explanatory drawing of the state at the time of completion of the 1st process concerning FIG. It is a figure which shows an example of the tubular instrument used for this invention. FIG. 5 is an explanatory view showing a state in which the tubular device shown in FIG. 4 is inserted into a heart and fixed.

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a fish blood removing method for embodying the technical idea of the present invention, and the present invention does not specify the fish blood removing method as follows. In addition, the present specification does not specify the members described in the claims to the members of the embodiments. Unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described in the embodiments are not intended to limit the scope of the present invention thereto, but are merely descriptions. It's just an example. The sizes and positional relationships of members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same names and reference numerals indicate the same or similar members, and detailed description thereof will be appropriately omitted. Further, each element constituting the present invention may be configured such that a plurality of elements are configured by the same member and one member also serves as a plurality of elements, or conversely, the function of one member is performed by a plurality of members. It can be shared and realized.
(Hamachi 1)

INDUSTRIAL APPLICABILITY The present invention is a blood bleeding method that can be widely used for fish in general, and is particularly suitable for use in cultured fish such as red sea bream, amberjack, yellowtail, and yellowtail. Here, as an example, a use example of the Hamachi 1 shown in FIG. 1 will be described.

As shown in FIG. 1, there is a pericardial cavity 11 which is a body cavity containing a heart 17 in the inner part of the gill lid 13 of Hamachi 1 and which is a body cavity containing an organ of the digestive system. It is isolated from the abdominal cavity 12 by a thin diaphragm.

It is desirable to perform live tightening and nerve tightening on Hamachi 1 in advance. As a specific example of the tightening method, there is a method of first inserting a pick between the eyebrows to destroy the brain (live tightening), and then inserting a wire along the spine to destroy the spinal cord (nerve tightening).
(First step)

In the present embodiment, as the first step, the head and abdomen of the yellowtail 1 are cut along the outer edge of the gills 14. More specifically, the gill lid 13 is lifted, and a blade is inserted into the membrane 15 under the gill 14 and the tip portion 16 of the sickle along a cutting line CL shown by a dashed line in FIG. Separate and. As a result, as shown in FIG. 3, a slit SL that connects the pericardial cavity 11 and the outside of the fish body is formed. From the slit SL, the arterial sphere 18 in the pericardial cavity 11 and the heart 17 connected to the caudal side can be seen.

No further incision is made in the present invention. Therefore, the organ contained in the abdominal cavity 12, which is a body cavity isolated from the pericardial cavity 11, is not exposed to the outside air. This feature allows the rest of the process to be performed while maintaining a good roundness of the fish.
(Second step)

In the second step, the injection needle 2 shown in FIG. 4 (corresponding to an example of “a tubular device” in the claims) is inserted into the heart 17 through the slit SL.

The injection needle 2 is made of a stainless steel tube having an outer diameter of about 3 mm, and projections 21 are provided at positions of about 20 mm and about 40 mm from the tip. The protrusion 21 projects about 1 mm from the surface of the stainless pipe, and is characterized by a shape that does not cause sharp angulation and that does not easily damage the vascular system of the fish. Further, the base end side of the injection needle 2 is connected to the discharge port of the pump via the tube 3 and the like, and from there, it is diluted water (corresponding to an example of "liquid" in the claims. Details will be described later). Is to be injected.

Note that the tubular device may be made of other metal or plastic that has a hardness that allows it to be pierced into the wall of the ventricle of the fish to be treated and that is resistant to corrosion, even if it is not made of stainless steel. The outer diameter of the tubular device is preferably about 3 mm for fish with a body weight of more than 1.5 kg, but smaller for fish with a body weight of less than 1.5 kg, because the heart size will be smaller. It is good to use one. In this case, the height of the protrusions may be made lower so that the protrusions are closer to the apex and provided at a narrower interval.

The injection needle 2 is inserted into the heart 17 from the caudal side of the ventricle 171 toward the arterial sphere 18. As shown by the broken line in FIG. It is a degree. At this time, be careful not to pierce the portion other than the puncture opening with the tip of the injection needle 2.
(Third step)

In the third step, the injection needle 2 is fixed to the heart 17. Specifically, as shown in FIG. 5, the portion of the arterial sphere 18 in which the injection needle 2 is inserted is pinched by the pinch 4. At this time, it is desirable that the pinch 4 holds the position between the two protrusions 21 of the injection needle 2.

As a result, even when a force is applied in the length direction of the injection needle 2, the projection 21 and the pinch 4 engage with each other, so that the injection needle 2 does not come out of the heart 17.
(Fourth step)

In the fourth step, the dilution water is pressed into the vascular system of Hamachi 1 via the injection needle 2.

The dilution water is seawater that has been sterilized by ozone sterilization, ultraviolet sterilization, or the like and diluted with water. If seawater cannot be sterilized, an aqueous solution prepared by dissolving salt in water may be used instead of the diluting water.

The dilution water is pressed into Hamachi 1 at a flow rate of 2 L/min. As a result, the blood pressure in the vascular system of Hamachi 1 becomes high, and blood is discharged mainly from the gap of the puncture opened in the ventricle 171 of the heart 17 by the injection needle 2 and the fragile portion of the capillaries of the gills 14. About 5 minutes after the start of press-fitting, it can be confirmed that the discharged liquid became substantially colorless and the blood in the vascular system was replaced with the diluting water.

In addition, it is desirable to change the flow rate of press-fitting according to the fish weight, such as 1 L/min for fish with a fish weight of 2 kg or less (such as red sea bream) and for fish with a fish weight of 2 kg or more and less than 5 kg (such as amberjack). On the other hand, 1.5 L/min is suitable, and 2 L/min is suitable for fish having a fish weight of 5 kg or more (such as yellowtail and yellowtail). If the flow rate is in accordance with this standard, blood can be efficiently discharged to the outside of the fish body while suppressing damage to the vascular system due to the injection of dilution water.

In addition, the press-fitting time may be appropriately extended if the discharged liquid is reddish even after 5 minutes have elapsed from the start of press-fitting. On the contrary, when the reddishness disappears from the discharged liquid before the lapse of 5 minutes from the start of the press-fitting, the press-fitting may be finished earlier.
(About liquid to be pressed)

The flavor of fish can be improved by appropriately adding food additives such as flavors, seasonings, and antioxidants to the liquid that is pressed into the vascular system of the fish.

Further, by dissolving or dispersing hydrogen so that the concentration of hydrogen in the liquid is in the range of 0.7 to 1.6 mg/L, hydrogen, which is an excellent reducing agent, spreads in the vascular system of fish, and oxidation of tissues in fish Can be suppressed, and the freshness retention of fish can be further enhanced.
(Action effect)

In the present invention, as shown in the above-mentioned Examples, the liquid is pressed into the vascular system by the incision of only the pericardium to perform the blood removal process. Can be provided. That is, it is possible to provide a round fish with reduced fishy odor and excellent freshness retention.

INDUSTRIAL APPLICABILITY The present invention can be particularly preferably used for cultured fish such as red sea bream, amberjack, yellowtail, and yellowtail that are distributed as round fish.

DESCRIPTION OF SYMBOLS 1... Hamachi 11... Peripheral cavity 12... Abdominal cavity 13... Gill lid 14... Gill 15... Membrane 16... Comb tip 17... Heart; 171... Ventricle 18... Arterial ball 2... Injection needle; 21... Protrusion 3... Tube 4 … Pinch SL… Slit CL… Cutting line

Claims (3)

By cutting the head and abdomen of the fish along the outer edge of the gills, forming a slit that communicates the pericardial cavity of the fish with the outside of the fish body,
Inserting a tubular instrument into the heart of the fish through the slit;
Securing the tubular device to the heart;
A method of bleeding fish, comprising the step of discharging the blood of the fish out of the body of the fish by pressurizing the liquid into the vascular system of the fish through the tubular device. The method of removing blood from a fish according to claim 1,
The flow rate of the liquid to be press-fitted is
1 L/min for fish weighing less than 2 kg,
1.5 L/min for fish weighing more than 2 kg and less than 5 kg,
A blood bleeding method of 2 L/min for fish weighing 5 kg or more. The method for removing blood from a fish according to claim 1 or 2,
The liquid to be injected is
A method for removing blood from a fish having a hydrogen concentration in the range of 0.7 to 1.6 mg/L.

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