JPH1028521A - Treatment of fish ovary - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fish ovary treatment method capable of efficiently taking fish eggs out of a fish ovary by simple mechanical operation. SOLUTION: This fish ovary treatment comprises placing a fish ovary 1 which contains a number of egg particles 2 covered with an ovarian membrane 10 into lukewarm saline water kept at 18-20 deg.C to swell the nuclei of the egg particles 2 by the osmotic pressure of the saline water, and dissolving protein from the egg walls 20 and connection parts between the egg walls 20 and the ovarian membrane 10, thus separating egg particles 2 from the ovarian membrane 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ovary treatment method for extracting egg particles from the ovaries of fish such as salmon and trout.

[0002]

2. Description of the Related Art Conventionally, from the ovaries of salmon, trout, etc.,
In order to separate the eggs and obtain the salmon roe, the operator rubs the muscles connected to each other on a wire mesh sieve of a predetermined mesh, passes the eggs one by one through a wire mesh, Was separated.

[0003]

[Problems to be solved by the invention]
Since it is not only used for food as it is but also used as a food material, its demand is high in recent years and it is necessary to produce it in large quantities. However, conventional manual work is inefficient,
Further, in order to cope with mass production, it is necessary to increase the number of workers, which causes a problem of increasing costs. It is an object of the present invention to efficiently separate eggs from fish ovaries by mechanical operation.

[0004]

[Means for Solving the Problems] A large number of eggs (2) are ovarian membranes (1).
Ovary (1) covered with (0) is immersed in salt water, and the epidermis of egg (2)
After tightening (20), the ovaries (1) are immersed in hot water for a short time to shrink the ovarian membrane (10), and the ovaries (1) are poured into a predetermined concentration of warm saline, and the osmotic pressure of the saline is applied. While expanding the nucleus (21) of the egg particle (2), the protein is dissolved by stirring the epidermis (20) of the egg particle (2) and the connecting portion between the epidermis (20) and the ovarian membrane (10), The egg particles (2) and the ovarian membrane (10) are separated.

[0005]

[Effects and effects] Immerse in warm salt water of a certain concentration, and epidermis (20)
The protein is dissolved by stirring the connection between the ovary membrane and the ovarian membrane (10), and the nuclei of the ovum (2) are expanded by the osmotic pressure of salt water, whereby the ovum (2) and the ) And the ovarian membrane (10) weaken, and the egg particles (2) tend to come off the ovarian membrane (10). The protein also dissolves in the epidermis (20) of the egg (2), and the epidermis (20) peels off. Thus, the egg particles (2) are easily separated from the ovarian membrane (10) and the epidermis (20) by the stirring step. Prior to the stirring step, the ovary (1) is immersed in hot water for a short time, and the ovary membrane (10) is exposed and easily removed from the ovarian membrane (10) by the pre-step of contracting the ovarian membrane (10). . Further, the ovaries (1) are immersed in salt water and the epidermis of the egg particles (2)
By tightening (20), it is possible to prevent the egg (2) from being broken in the subsequent processing steps.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be described in detail with reference to the drawings. The present invention relates to a method of treating an ovary, which is divided into an ovarian pretreatment step, a stirring step, and a post-treatment step, and will be described in order from the pretreatment step. Also,
The applicant has conceived of the present invention with the retrieval of egg grains in mind, and will describe the production of salmon roe as an example. As shown in FIG. 6, a fish ovary (1) has a large number of eggs (2) and (2) covered with an ovarian membrane (10), and the egg (2) has a nucleus (21) as a thin film epidermis.
Covered by (20). One epidermis of egg (2)
(20) is an ovarian membrane (10) with a connecting thread (3) formed of protein
Is connected to. Here, the connecting thread (3) supplies nutrients that have passed through the ovarian membrane (10) from the fish to the egg particles (2) when the ovaries (1) were present in the fish. (1)
In the state where is taken out, the connecting yarn (3) remains.

(Pretreatment step) In the pretreatment step, FIG.
As shown in (a), a plurality of ovaries (1) connected to each other
The ovarian membrane (10) is separated one by one and cuts (11) are formed on the surface of the ovarian membrane (10). This cut (11) can be easily formed by applying force to open the ovaries (1) by hand. The ovary (1), which has been cut by expanding the cut (11), is placed in a basket (7) as shown in FIG. By immersing in the salt water, the epidermis (20) of the egg (2) is tightened and slightly hardened, and the egg (2) is hardly deformed in the subsequent processing steps. Especially in the ovaries of salmon ovaries,
This tendency is remarkable. Next, as shown in FIG.
Soak the ovaries (1) with the basket (7) in hot water at 50 to 90 ° C, preferably 80 ° C for 3 to 5 seconds, and place the ovaries (1) in the basket (7).
Stir. Ovarian membrane by washing the ovaries (1) with hot water
The (10) shrinks, and the egg particles (2) are exposed from the ovarian membrane (10) and are easily taken out. Thereafter, the basket (7) is withdrawn from the hot water and drained sufficiently to complete the pretreatment step.

(Stirring step) In the stirring step, the cracked ovaries (1) are stirred at a concentration of about 10% in warm saline at 18 ° C. to 20 ° C. to remove the ovaries from the ovarian membrane (10). The egg (2) is released, and the epidermis (20) is peeled from the egg (2). Egg (2) and ovarian membrane
The mixture of (10) is filtered to take out the egg (2). The stirring step is a characteristic part of the present invention, and the procedure is described below. FIG. 2 shows a stirring tank (4) in which the ovaries (1) split into two are put.
FIG. The stirring tank (4) has a pretreated ovary (1), a pump (80) and an on-off valve (81) from a tank (8).
, A saline solution is injected. The ratio of ovaries (1) to saline is 1: 2. It should be noted that the salt water concentration and the temperature were set to the above values based on the experimental results of the applicant.

A blade rotatably driven by a motor (M1) provided outside the stirring tank (4) is provided at the bottom of the stirring tank (4).
(5) is provided. The rotation axis of the blade (5) is the stirring tank
It is tilted with respect to the axis of (4), and the forward and reverse rotation of the blade (5) is alternately switched, so that the circulating flow of salt water causes a stirring tank.
(4) It goes all over. When the ovaries (1) are stirred with the salt water, the eggs (2) are separated from the ovarian membrane (10) due to the impact on the wall of the ovaries (1) and the pressure difference of the circulating flow. Further, the blade (5) is a so-called battle type in which a plurality of stirring pieces (50) (50) having a rounded tip end are radially connected as shown in FIG. There is no risk of damaging the egg grains (2).

The stirring tank (4) has a capacity of 200 liters, and 50 kg of ovaries, 100 liters of water and 17.5 kg of salt are charged in one stirring step. At this time, a nitrate or starch may be added for the purpose of maintaining quality or the like. In addition, in the case of salmon roe production, the salt water and the ovaries (1) are not stirred immediately after being put into the stirring tank (4), but are kept stationary for about 5 minutes, and after a salting time, are stirred. Further, the stirring tank (4) is formed of stainless steel in view of corrosiveness.

By soaking in a 10% strength salt water,
The nucleus (21) of the egg (2) expands due to the osmotic pressure. Further, the protein of the connecting thread (3) between the epidermis (20) and the ovarian membrane (10) is dissolved by stirring, whereby the eggs (2) mutually and the eggs (2) are dissolved.
The binding force between the ovarian membrane (10) and the ovarian membrane (10) is weakened.
0). Also the epidermis (20) of the egg (2)
The protein also dissolves and detaches from the nucleus (21). Thus, in the stirring tank (4), the nucleus (21) of the egg particle (2) contains the ovarian membrane (10) and the epidermis (2).
0). In the salt water, the egg particles (2), the detached ovarian membrane (10) and the epidermis (20) float, and the salt water passes through an outlet valve (40) provided below the stirring tank (4). Pump (not shown)
Is sent to the separation device (6) in the next step.

As shown in FIG. 3, the separation device (6) has two stages of first and second filters (60) and (61) having meshes, and is located below the filters (60) and (61). And a diaphragm (65) to which the filters (60) and (61) are attached. The first and second filters (6
Outside the outlets (62) and (63), the diaphragm (65)
An egg outlet (64) is provided on the outside of the container. Diaphragm (65)
Is attached to the base (67) via a coil spring (66),
It is eccentrically rotated by a motor (M2) mounted eccentrically with respect to the center axis. As for the two-stage filters (60) and (61), the upper first filter (60) is coarsely provided.
Both (61) allow the passage of egg (2). In order to use the separation device (6), the ovarian membrane (10) and the egg particles are placed on the first filter (60).
The mixture of (2) is supplied together with the salt water, and the motor (M2) is energized to laterally vibrate both filters (60) and (61). Eggs (2) separated one by one can pass through the first filter (60) but cannot pass through the still connected egg (2) and ovarian membrane (10), and the first filter (60) ) Remains on. The first filter (6
0) The ovarian membrane (10) left on the top moves spirally outward by vibration and is sequentially discharged from the discharge port (62).

In the salt water having passed through the first filter (60),
In some cases, fragments of the ovarian membrane (10) are mixed in addition to the egg particles (2). Therefore, the second filter, which is finer than the first filter (60),
Fragments of the ovarian membrane (10) are removed by the filter (61) and discharged from the outlet (63). The salt water and the eggs (2) that have passed through the second filter (61) fall on the diaphragm (65), and fall into the egg outlet (6).
It is taken out sequentially from 4) As described above, since the separation of the egg particles (2) and the ovarian membrane (10) is performed in two stages, the work can be performed efficiently. In addition, the applicant sets the mesh pitch of the first filter (60) to 8 mm and the mesh pitch of the second filter (61) to 5 to 6 mm.
Can be changed depending on the size of. Further, as shown by a virtual line in FIG. 3, if a substantially conical guide plate (68) is provided on the vibration plate (65), the salt water and the egg (2) can be more efficiently supplied to the egg outlet ( 6
4) can be taken out.

(Post-treatment step) The egg (2) taken out of the separating device (6) may contain the peeled epidermis (20). For this purpose, as shown in FIG. 4, the egg (2) is placed in a 4% strength saline solution. Since the egg (2) sinks and the epidermis (20) floats on the water surface, the epidermis (20) can be separated from the egg (2). First, in the stirring step, the egg (2) absorbs 10% concentrated salt water, so the salt content is too high to be edible, but by soaking it in 4% salt water, It can be diluted to a salty taste. The raised epidermis (20) can be removed by scooping a net, tilting a container containing salt water and eggs (2), or overflowing salt water.

From the start of the stirring step to the removal of the epidermis (20), one cycle is performed in 30 minutes. Specifically, 3 minutes for the ovary (1) and the addition of the salt water, 5 minutes for the salting time, 10 minutes for the stirring, 5 minutes for the suction with the pump, and the removal of the sieve and the epidermis (20) by the separation device (6) 7 minutes. Therefore, if work is performed for 8 hours a day, 16 cycles, that is, 50 × 16 = 8
Egg grains (2) of 00 kg can be prepared. Further, the applicant has confirmed that the use of the stirring tank (4) and the separation device (6) results in a yield of the egg (2) of 80%. The egg particles (2) from which the epidermis (20) has been removed are placed in a cloth bag (70) and left in a cold and hot storage for about 12 hours, as shown in FIG. Salting means that the salt is sufficiently penetrated into the egg (2) to increase the strength of the egg (2). The drained eggs (2) are sorted according to a predetermined weight, added with a seasoning, and left in a refrigerator to become a product.

The pretreatment step can be mechanized as shown in FIG. From the upstream side, a first tank (91) containing salt water having a concentration of 3 to 5% and a second tank (9) containing hot water of about 80 ° C.
2) In order, a belt conveyor (9) to transport the ovaries (1)
Passes through both tanks (91) and (92). The belt conveyor (9) is supported for sliding by a roller (90) provided on a sliding path. If the ovaries (1), which have been cut in advance from the upstream side, are arranged and placed on the belt conveyor (9), the ovaries (1) are immersed in the first tank (91) and washed with salt water. . After that, hot water is washed in the second tank (92), and the ovarian membrane (1) is washed.
0) shrinks. Thus, the pretreatment step is completed, and the ovaries (1) are conveyed to the stirring tank (4). The belt conveyor (9) is conveyed at a constant speed, and is cleaned in the first tank (91) and the second tank (91).
The hot water is washed in the tank (92) for about the same time, but when changing the washing time and the hot water washing time, the length of the tank (91) (92) along the traveling direction of the belt conveyor (9) is changed. Just change it.

The removal of the skin (20) in the post-processing step can also be mechanized as shown in FIG. The egg (2) that has undergone the stirring step is placed on a belt conveyor (9) that transports the egg (2), and the belt conveyor (9) passes through tanks (93) (93) containing 4% salt water. Although two tanks (93) are arranged in FIG. 8, three or more tanks (93) may be provided. In salt water of tank (93),
The epidermis (20) attached to the egg (2) rises, and the egg (2) from which the epidermis (20) has been removed is taken out of the tank (93).
Draining is performed as described above.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a view showing a step of separating and cutting an ovary, FIG. 1B is a view showing a washing step with salt water, and FIG. 1C is a view showing a hot water washing step.

FIG. 2 is a longitudinal sectional view of a stirring tank.

FIG. 3 is a longitudinal sectional view of a separation device.

FIG. 4 is a diagram showing a step of soaking egg particles in salt water to separate epidermis.

FIG. 5 is a view showing a draining step.

FIG. 6 is an enlarged view of the inside of an ovary.

FIG. 7 is a view showing an apparatus in which a pretreatment process is automated.

FIG. 8 is a view showing an apparatus in which a post-processing step is automated.

FIG. 9 is a perspective view of a blade.

[Explanation of symbols]

 (1) Ovary (2) Egg grain (4) Stirring tank (10) Ovarian membrane (20) Epidermis

Claims (2)

[Claims] An ovary (1) having a large number of eggs (2) covered with an ovarian membrane (10) is poured into warm saline having a predetermined concentration, and the nucleus (2) of the eggs (2) is introduced by osmotic pressure of the saline. 21) Inflate the egg grains
The ovary which separates the egg particles (2) and the ovarian membrane (10) by stirring the epidermis (20) and the connection between the epidermis (20) and the ovarian membrane (10) to dissolve the protein, Processing method. 2. An ovary (1) covered with an ovarian membrane (10) having a large number of eggs (2) soaked in salt water to tighten the epidermis (20) of the eggs (2), ) Is briefly immersed in hot water, and subjected to a pretreatment for exposing the egg particles (2) from the ovarian membrane (10) by contraction of the ovarian membrane (10). The nucleus (21) of the egg (2) is expanded by the osmotic pressure of salt water,
The ovary which separates the egg particles (2) and the ovarian membrane (10) by stirring the epidermis (20) and the connection between the epidermis (20) and the ovarian membrane (10) to dissolve the protein, Processing method.