JPH11196706A - Labeling shellfish to be labeled - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply label shellfishes to be labeled in a short time, to reduce the damage to shellfish body to the minimum and to readily discriminate shellfishes by a metal detector without impairing growth and without reduction in commercial value, by embedding a metal piece in the ligament of bivalve. SOLUTION: A metal piece 5 to be labeling piece is embedded in a ligament such as an outer ligament 3 or the like of a bivalve 1 to label the shellfish to be labeled. The metal piece 5 is preferably made of a material such as stainless steel, gold or the like which does not become rusty and is not harmful to a shellfish and preferably the metal piece 5 is formed into a cylindrical shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for labeling a specific shellfish as a labeled shellfish for conducting a fishery resource survey or the like.

[0002]

2. Description of the Related Art Bivalve resources (number,
In the fisheries resource survey, which is a survey of age composition, etc., artificially made or naturally collected juvenile shellfish are labeled and released into the sea as labeled shellfish. The tagged shellfish are collected from the inside, and the amount of shellfish resources in the release sea area is estimated from data such as the recapture place, the size of the shellfish, and the capture effort (number of times of pulling a rope, fishing operation time, etc.).

[0003] In the monitoring of water environment assessment,
For example, labeled bivalves are released into the water area at a specific location, such as a coastal construction drainage site, and after a certain period of time, the labeled bivalves are collected. Investigate and compare and evaluate the environment of the water area.

[0004] Biological resource management is not limited to fisheries, but also releases labeled shellfish in the same manner as in the above case, and then captures the shellfish to capture the entire shellfish including other rare ones. This survey measures the amount of resources. If the result of the survey shows that the amount of resources decreases continuously for several years, measures such as improvement of the habitat and reproduction (population seedling release) will be taken. If the number increases, take measures such as promoting capture.

[0005] In such fishery resource surveys, monitoring of water environment assessment, biological resource management, and the like, a tag is attached to identify the released shellfish as described above. For example, paints such as paint or nail polish on the shell surface, or metal powder with adhesive added as a marking material, apply these with a brush or spray to mark, or They use a cutting tool to cut out a part of the surface of the shell and make a scratch.

Alternatively, in the case where a colored portion serving as a growth reference mac is formed on the surface of the shell, iron ions are reduced on the surface of the shell and deposited as iron on the newly grown portion of the larva so that the colored portion does not spread. This forms an iron oxide film (rust).

[0007]

In the method of applying a marking material such as a paint, if there is other deposits on the surface of the shell, it becomes difficult to distinguish the marking portion from the marking portion, or the shellfish repeatedly dives into the sediment. When leaving, signs are likely to fall off due to friction with sand or mud. Further, since the sign is present on the surface of the shell, the commercial value of the shell may be reduced.

[0008] The method of directly scratching the shell may damage the shell and may make it impossible to reproduce the shell.

The method of forming an iron oxide film (rust) on the shell surface requires one to two weeks before the film is formed. Until that time, the shell for marking cannot be released. During this time, breeding of shellfish must be carried out, and labor for breeding is also required. In addition, since the marker is present on the surface of the shell as in the case of the method using marking such as paint, the commercial value of the shell may be reduced.

[0010] Further, the coloring retention time of the colored iron rust is at most about 8 months, and the colored iron rust may be decolorized with the passage of time, making it difficult to identify the sign.

[0011] In any of the methods, the identification of the labeled shellfish after the label is attached is difficult because the human eyes directly check the presence or absence of the marking on the shell surface for each shellfish. Also, identification is almost impossible except by experts.

An object of the present invention is to eliminate the disadvantages of the prior art, to make it easy to attach a label to a shell in a short time, to have little effect on the shell, and to release the shell repeatedly after releasing the labeled shell. Signs will not be impaired even if diving into or out of quality, and even during identification after collection, even non-experts can easily identify the signs attached to the sign shells, It is an object of the present invention to provide a method for labeling a labeled shellfish that does not directly damage the shell and does not cause a decrease in the commercial value of the shellfish.

[0013]

According to the present invention, in order to achieve the above object, first, a metal piece serving as an identification piece is embedded in a ligament of a bivalve, and second, the metal piece is made of stainless steel, gold, or the like. Third, the metal pieces should be formed in a columnar shape without causing rust and no harm to shellfish.

According to the first aspect of the present invention, when the bivalve is a labeled shell, the location where the identification piece is attached is a ligament, so that damage to the shell can be minimized and growth is not impaired. . And, since the identification piece is composed of a metal piece, it can be easily inserted into the ligament, can be easily installed in a short time, there is no risk of being detached after the installation, and anyone after the installation can easily perform the identification after the installation with the metal detector. .

According to the second aspect of the present invention, in addition to the above functions, the metal piece is made of a material that does not rust, such as stainless steel or gold, and does not harm shellfish, so that the shell body after mounting is formed. The effect on the environment can be reliably reduced.

According to the third aspect of the present invention, in addition to the above operation, the metal piece is formed in a columnar shape, so that it can be easily inserted into a ligament of a shell, which is a hard tissue.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of a method for labeling a labeled shell of the present invention, FIG. 2 is a side view of the labeled shell used in the method of the present invention, and FIG. Referring to FIGS. 2 and 3, reference numeral 1 indicates a bivalve such as clams as a labeled shell, 2 indicates a shell top, and 3 indicates an external ligament existing near the shell top 2.

In order to adopt such a bivalve 1 as a labeled shell, as shown in FIG. 1, first, a plurality of bivalves 1 are collected from the habitat of the bivalve 1, and healthy solids are selected from them.

Next, for the healthy bivalve 1 selected,
The bivalve 1 is sorted by the waterproof portable metal detector 4 to check in advance whether a metal object is attached to the bivalve 1, and the bivalve 1 to which no metal is attached is adopted as a marking shell.

After measuring the shell length and weight of the bivalve 1 used as the labeled shell, a metal piece 5 serving as a discrimination piece is embedded in the outer ligament 3 of the bivalve 1 using an injector 6. In this case, the embedding portion of the metal piece 5 is the outer ligament 3, but may be the inner ligament.

The metal piece 5 is made of a material which does not rust and does not harm shellfish, for example, stainless steel, gold, titanium alloy, chromium alloy, etc., and has a length of 0.5 to 2.0 m.
It is formed in a pipe shape or a rod shape having a diameter of about 0.25 mm and a diameter of about 0.25 mm, and can be arbitrarily determined according to the size of the target labeled shellfish. In this case, the pipe type is easier to insert into the ligament, which is a hard tissue.

When the clam 5 is attached to the bivalve 1 using the injector 6, when clams are used as the bivalve 1, 200 pieces of clams can be attached per hour, and a large amount of Is possible.

Next, the waterproof portable metal detector 4 is used again to confirm whether the metal piece 5 serving as the identification piece is embedded in the bivalve 1 and the individual bivalve 1 serving as the labeled shell is selected. The bivalve 1 which has become a labeled shell with the metal pieces 5 embedded therein is returned to its habitat for resource survey, environmental monitoring and the like.

The released bivalves 1 are in a state where the metal pieces 5 are buried until they are re-captured. However, the metal pieces 5 do not harm the bivalves 1 themselves. Damage to the shell can be minimized because it is only at the external ligament 3 and does not hinder the growth of the shellfish.

The metal piece 5 is connected to the external ligament 3 as described above.
Is buried, so that it is unlikely that this will come off the bivalve 1 during the discharge period.

After a certain period of time after the release, the bivalve 1 is recaptured, the labeled shell is selected by the metal detector 4, and the data such as the number, shell length and weight are compared with those before the release, and the biological resources are determined. Grasping dynamics and habitat assessment. The discrimination of the labeled shell by the metal detector 4 can be easily performed only by searching the vicinity of the ligament of the bivalve 1 with the metal detector 4, and if the metal piece 5 is present, there is a reaction.

The results of a test for applying a label to the bivalve shell 1 using a metal piece 5 using clams are shown below. A labeled treatment test section and a non-treated control section with a label are provided, and 60 clams each having a shell length of 20 to 25 mm are accommodated in a sand-lined water tank,
The test period was 180 days, and the suitability of the labeling method using the metal pieces 5 was determined based on the retention rate of the metal pieces 5 as labels and the survival and growth of clams.

As shown in FIG. 4, there was no significant difference in the survival rate between the labeled test section and the untreated control section, which were labeled with the metal pieces. Was 97% in 1 of 60 individuals.

Further, as shown in FIG. 6, there was no significant difference in the growth of clams between the test group treated with the label and the control group without treatment. From the results of these tests, it was found that the metal piece 5 embedded in the ligament was the shell of the bivalve 1 Turned out to have no effect on the body.

[0030]

As described above, according to the method for labeling a labeled shell of the present invention, when a bivalve is used as a labeled shell, the location for attaching the identification piece is a ligament, so that damage to the shell is minimized. Ligaments are not edible and do not degrade their commercial value. And, by constituting the identification piece with a metal piece, it can be easily inserted into the ligament,
Mounting can be performed easily in a short time, there is no risk of being detached after mounting, and identification after mounting can be easily performed by anyone with a metal detector.

The metal piece is made of a material that does not rust, such as stainless steel and gold, and does not harm shellfish, so that the effect on the shell after mounting can be reduced with certainty. Therefore, it can be easily inserted into the ligament of the shell, which is a hard tissue.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a method for labeling a labeled shellfish of the present invention.

FIG. 2 is a side view of a bivalve in which the method for labeling a labeled shell of the present invention is performed.

FIG. 3 is a cross-sectional plan view of a bivalve in which the method for labeling a labeled shell of the present invention is performed.

FIG. 4 is a graph showing the survival rates of labeled and unlabeled shellfish.

FIG. 5 is a graph showing the label retention of labeled shellfish.

FIG. 6 is a graph showing changes in weight and weight gain of shellfish with and without labeling.

[Description of Signs] 1 ... Bivalves 2 ... Shell tops 3 ... External ligaments 4 ... Metal detectors 5 ... Metal pieces 6 ... Injectors

Claims (3)

[Claims] 1. A method for labeling a labeled shell, comprising embedding a metal piece serving as an identification piece in a ligament of a bivalve. 2. The metal piece does not rust such as stainless steel and gold,
2. The method for labeling a labeled shell according to claim 1, wherein the shell is made of a material that does not harm the shellfish. 3. The method according to claim 1, wherein the metal piece is formed in a cylindrical shape.