Anchor apparatus and method for cultivating aquatic animals

Abstract

To address such a problem that although a technique for applying a mark having a source display function to aquatic animals such as shellfish has been developed due to the need to prevent poaching and specify production areas, it is difficult to make a mark with arbitrary characters or figures on aquatic animals.SOLUTION: An attachment device for attaching and cultivating aquatic animals with outer shells, the attachment device has an uneven shape on an attachment object surface for attaching the aquatic animals, where the uneven shape has a shape formed by inverting a mark.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an attachment device for attaching and culturing aquatic animals, and a method for culturing aquatic animals using the attachment device.

Background Art

[0002] Due to the need to prevent overfishing and identify the origin, technologies for applying labels with origin indication functions to aquatic animals such as shellfish have been developed. For example, a method of identifying the origin of abalones by feeding abalones with multiple seaweeds of different colors and applying a two-color or more stripe pattern to the shells of abalones (see Patent Document 1), a label for shellfish characterized in that a shell powder is adhered to the opposite side of the shell at the portion where a clamping tool that sandwiches the peripheral edge of the shell of the shellfish from the front and back is applied to the inner surface of the shell (see Patent Document 2), a method of forming a label using rust generated by immersing the shell in water and reacting iron powder particles with oxygen in the water (see Patent Document 参照), a labeling method for labeled shells in which a metal piece serving as an identification piece is embedded in the ligament of bivalve shells (see Patent Document 4), a label forming method in which a coloring substance is deposited on the shell surface by chemical bonding so that the colored portion does not spread to the newly growing portion of juvenile shells (see Patent Document 5), etc. can be mentioned.

[0003] In addition, for oysters, which are a typical cultured species of bivalve shells, the shape of an attachment device for attaching and culturing oyster larvae has been studied to improve the efficiency of culturing. For example, in order to improve the adhesiveness of oysters, a disc-shaped oyster culture substrate having an attachment bed composed of fan-shaped, grid-shaped, trapezoidal, and other polygonal valleys on the surface (see Patent Document 6), an oyster culture attachment device that is a flat plate having a plurality of protruding spacers and fine irregularities on the surface for improving adhesiveness (see Patent Document 7), etc. are known.

[0004] In addition, as a technology for changing the shape of oyster shells to increase their commercial value, a step of forming a V-shaped depression by cutting out the center of the growth end side of the shelled oyster in a V-shape and inserting and engaging a forming tool having a V-shaped tip side corresponding to the cut-out portion is included, and a method for culturing shelled oysters having a heart-shaped shell outer shape is known (see Patent Document 8). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2012-023971 [Patent Document 2] Japanese Patent Publication No. 2004-141084 [Patent Document 3] Japanese Patent Publication No. 2000-300108 [Patent Document 4] Japanese Patent Application Publication No. 11-196706 [Patent Document 5] Japanese Patent Application Publication No. 6-141725 [Patent Document 6] Japanese Patent Application Publication No. 10-155386 [Patent Document 7] Utility Model Registration No. 3182951 Gazette [Patent Document 8] Japanese Patent Publication No. 2012-152179 [Overview of the project] [Problems that the invention aims to solve]

[0006] In the methods described in Patent Documents 1 and 3-5, it is difficult to mark seashells with arbitrary letters or figures. Furthermore, the method described in Patent Document 2 requires a clamping device for each individual, which poses a problem as it becomes prohibitively expensive when used on a large number of aquatic animals.

[0007] As shown in Patent Document 8, there are known methods for changing the shape of the oyster's outer shell, and by giving the outer shell a unique shape, it is possible to provide a source indication function. However, this method requires processing such as notching and insertion engagement for each individual oyster, which is extremely labor-intensive. [Means for solving the problem]

[0008] The present invention provides an attachment device for easily and inexpensively providing aquaculture animals with exoskeletons, such as oysters, with functions for identifying their own products or products from others, indicating their origin, and a method of aquaculture using the said attachment device.

[0009] In other words, the present invention is an attachment device for cultivating aquatic animals that have an exoskeleton, wherein the attachment surface of the aquatic animal has an uneven shape, and the uneven shape is an inverted version of the trademark.

[0010] Another aspect of the present invention is an adhesive device having a release portion on the adhesion surface that can be peeled off from the adhesion surface. Yet another aspect of the present invention is an adhesive device in which the convex portion of the uneven shape is formed from a release portion that can be peeled off from the adhesion surface. Furthermore, yet another aspect of the present invention is an adhesive device in which a release portion that can be peeled off from the adhesion surface is embedded in the concave portion of the uneven shape. The adhesion surface may be a synthetic resin and / or a natural resin, and the release portion may be a ceramic and / or a non-fired ceramic.

[0011] Furthermore, the present invention provides a method for cultivating aquatic animals. Specifically, the present invention provides a method for cultivating aquatic animals that includes the steps of attaching a juvenile aquatic animal having an exoskeleton to an attachment device having an uneven surface on the attachment surface of the aquatic animal, raising the aquatic animal attached to the attachment device, and harvesting the raised aquatic animal, wherein the uneven surface is an inverted mark, and the mark is transferred onto the exoskeleton of the harvested aquatic animal.

[0012] Another aspect of the present invention is a method for cultivating aquatic animals, wherein the attachment surface of the attachment device is provided with a peelable portion that can be peeled off from the attachment surface, and the mark transferred onto the outer shell of the harvested aquatic animal consists of the peelable portion that has been peeled off from the attachment surface. Another aspect of the present invention is a method for cultivating aquatic animals, wherein the convex portion of the uneven shape is formed from a peelable portion that can be peeled off from the attachment surface, and the mark transferred onto the outer shell of the harvested aquatic animal consists of the peelable portion that has been peeled off from the attachment surface. Furthermore, another aspect of the present invention is a method for cultivating aquatic animals, wherein the concave portion of the uneven shape is embedded with a peelable portion that can be peeled off from the attachment surface, and the mark transferred onto the outer shell of the harvested aquatic animal consists of the peelable portion that has been peeled off from the attachment surface. The attachment surface may be a synthetic resin and / or a natural resin, and the peelable portion may be a ceramic and / or a non-fired ceramic.

[0013] The aquatic animal in question may belong to the family Ostreidae. Furthermore, the mark may have the function of distinguishing one's own goods from those of others and / or indicating the source of the goods. [Effects of the Invention]

[0014] By using the attachment device of the present invention to cultivate aquatic animals with exoskeletons, such as oysters, it is possible to harvest aquatic animals with markings on their exoskeletons. The cultivation method of the present invention is the same as a normal cultivation method, except for the use of the attachment device of the present invention, and no special work is required.

[0015] Furthermore, the attachment device of the present invention has an uneven surface with a reversed marking, and juvenile oysters and other organisms prefer to attach to the uneven surface on the attachment substrate. After the juvenile shellfish have attached, the uneven surface makes it difficult for aquatic animals to detach during cultivation.

[0016] The attachment device of the present invention may also be provided with a detachment section that detaches from the attachment surface when harvesting aquatic animals. The detachment section forms a mark on the outer shell, and by selecting a material with color for the detachment section or by mixing in any pigment, the mark on the outer shell can be given a desired color. [Brief explanation of the drawing]

[0017] [Figure 1] It is a perspective view showing the appearance of the adherer of the embodiment. [Figure 2] It is a schematic cross-sectional view showing the concavo-convex shape of the adherer of one embodiment. [Figure 3] It is a schematic cross-sectional view showing the concavo-convex shape of the adherer of one embodiment. [Figure 4] It is a schematic cross-sectional view showing the concavo-convex shape of the adherer of one embodiment. [Figure 5] It is a schematic cross-sectional view showing the concavo-convex shape of the adherer of one embodiment. [Figure 6] It is a schematic cross-sectional view showing the concavo-convex shape of the adherer of one embodiment. [Figure 7] It is a schematic cross-sectional view showing the concavo-convex shape of the adherer of one embodiment. [Figure 8] It is a perspective view showing the aquaculture method using the adherer of the embodiment. [Figure 9] It is a photograph showing the appearance of the adherers of Examples 1 and 2. [Figure 10] It is a photograph showing the appearance of the outer shell of the abalone cultured using the adherers of Examples 1 and 2. [Figure 11] It is a photograph showing the appearance of the adherers of Examples 3 and 4. [Figure 12] It is a photograph showing the outer shell of the abalone cultured using the adherer of Example 3. [Figure 13] It is a photograph showing the outer shell of the abalone cultured using the adherer of Example 4.

Mode for Carrying Out the Invention

[0018] Hereinafter, the present invention will be described in detail based on the mode for carrying out the invention, but the present invention is not limited by the embodiment.

[0019] The attachment apparatus of the present invention and the method of cultivating aquatic animals using the attachment apparatus are applicable to aquatic animals that have an outer shell and grow attached to the attachment apparatus. The aquatic animals are preferably bivalves or crustaceans. Examples of bivalves include Pacific oysters, rock oysters, Japanese oysters, scallops, ark clams, Ezo oysters, clams, Manila clams, pen shells, pearl oysters, white pearl oysters, black pearl oysters, and Mabe oysters. Examples of crustaceans include barnacles, specifically including mountain barnacles, red barnacles, large red barnacles, black barnacles, picoloco barnacles, goose barnacles, and persebe barnacles.

[0020] More preferably, the aquatic animal in the present invention is a bivalve mollusk belonging to the family Ostreidae. Bivalves belonging to the family Ostreidae have an exoshell consisting of a left valve and a right valve, and grow by attaching the left valve to a substrate. Hereinafter, embodiments of the attachment apparatus and the cultivation method using the attachment apparatus will be described using oysters such as the Pacific oyster (Crassostrea gigas) and the rock oyster (Crossostrea nippona), which belong to the genus Crassostrea, as examples of aquatic animals. However, the present invention is not limited to these aquatic animals, but is applicable to all aquatic animals that grow by attaching their exoshell to a substrate.

[0021] Figure 1 shows a perspective view of an embodiment of the attachment device 10. The attachment device 10 is disc-shaped, but in other embodiments it may be rectangular or other flat plate-shaped, or a three-dimensional structure such as a sphere, prism, or cylinder. The surface and / or back surface of the attachment plate 10 is also called the attachment surface 12, to which juvenile aquatic animals attach. The entire surface of the attachment surface 12 is provided with a raised and recessed shape that is a horizontally or vertically inverted version of the mark. In this embodiment, the attachment surface 12 is continuously provided with raised portions 14 that are mainly horizontally inverted versions of the alphabet "HRO".

[0022] Here, a mark is preferably a letter, figure, symbol, three-dimensional shape, or color, or a combination thereof, that can be recognized by human perception and has the function of indicating the source and / or distinguishing one's own goods from those of others. When the uneven shape of the attachment surface 12 is transferred to the outer shell of the oyster, an inverted shape of the uneven shape, i.e., a mark, is formed on the outer shell, allowing consumers to easily identify the origin and producer of the oysters. When oysters are cultivated using the attachment device 10, the letters "HRO," which are the inverted shape of the convex part 14, are transferred to the left shell of the oyster, and oysters with the letters "HRO" formed on the left shell can be harvested.

[0023] Here, we will describe several embodiments of the uneven shape provided on the attachment surface of the oyster attachment device. Figures 2 to 7 are schematic cross-sectional views in the thickness direction of a plate-shaped attachment device 10, where the attachment device 10 has only one side (front surface) as the attachment surface 12. In Figures 2 to 7, the recesses 14 and / or protrusions 16 on the attachment surface are shown in cross-section in the short direction. Figure 2 is an embodiment in which a protrusion 14 is provided on the attachment surface 12, and when the attachment surface 12 is viewed from above, the protrusion 14 forms a shape that is an inverted version of the mark. When oysters grown attached to this attachment surface are harvested, a recess corresponding to the protrusion 14 is formed on the left shell. Since this recess is an inverted transfer of the shape of the protrusion 14, the mark is formed in a concave shape on the left shell.

[0024] Figure 3 shows an embodiment in which a recess 16 is provided on the attachment surface 12. When the attachment surface 12 is viewed from above, the recess 16 forms a shape that is an inverted version of the mark. When oysters grown attached to the attachment surface 12 are harvested, a protrusion corresponding to the recess 16 is formed on the left shell. This protrusion forms a mark that is an inverted version of the shape of the recess 16. Since this protrusion is a transfer of the inverted shape of the recess 16, the mark is formed as a convex shape on the left shell.

[0025] Figure 4 shows an embodiment in which a protrusion 14 is provided on the attachment surface 12. The protrusion 14 consists of a peelable portion 18 that can be peeled off from the attachment surface 12, and when the attachment surface 12 is viewed from above, it forms a shape that is an inverted version of the mark. When oysters are attached to the attachment surface 12 and grown, the left shell of the oyster adheres to the protrusion 14. When the oysters are harvested, the protrusion 14 peels off from the attachment surface 12, and the peelable portion 18 of the peeled protrusion 14 forms a mark on the left shell that is an inverted version of the shape of the protrusion 14.

[0026] Figure 5 shows an embodiment in which a recess 16 is provided on the attachment surface 12. The recess 16 has a shape that is an inverted version of the mark when the attachment surface 12 is viewed from above, and the detachment portion 18 is embedded in it. When oysters are attached to the attachment surface 12 and grown, the left shell of the oyster adheres to the detachment portion 18 embedded in the recess 16. When the oysters are harvested, the detachment portion 18 peels off from the attachment surface 12, and the peeled detachment portion 18 forms a mark on the left shell that is an inverted version of the shape of the recess 16.

[0027] Figure 6 shows an embodiment in which a protrusion 14 is provided on the attachment surface 12. When the attachment surface 12 is viewed from above, the protrusion 14 forms a shape that is an inverted version of the mark. Furthermore, the attachment surface 12 is provided with a peeling portion 18 that can be peeled off when the oyster is harvested. The peeling portion 18 is provided in layers on the attachment surface 12 with a substantially uniform thickness. The oyster attaches to the layered peeling portion 18 provided on the attachment surface 12, and as the left shell grows so that it incorporates the peeling portion 18 on the protrusion 14, a mark consisting of the peeling portion 18 is formed on the left shell at the time of harvest. The peeling portions 18 other than those on the protrusion 14 are either not incorporated into the left shell, or even if they are incorporated, they are thinner than the peeling portion on the protrusion 14. Therefore, the left shell is formed with a shape that is visible as a mark that is an inverted transfer of the shape of the protrusion 14.

[0028] Figure 7 shows an embodiment in which a recess 16 is provided on the attachment surface 12. When the attachment surface 12 is viewed from above, the recess 16 forms a shape that is an inverted version of the mark. Furthermore, the attachment surface 12 is provided with a peel-off portion 18 that can be peeled off when the oyster is harvested. The peel-off portion 18 is provided in layers on the attachment surface 12, embedding the recess 16. The oyster attaches to the layered peel-off portion 18 provided on the attachment surface 12 and grows while adhering its left shell to the peel-off portion 18. When the oyster is harvested, the peel-off portion 18 peels off from the attachment surface 12. Of the peel-off portions 18 that are adhered to the left shell, the peel-off portion 18 embedded in the recess 16 is thicker than the other peel-off portions 18, so that the left shell has a shape that is visible as a mark with the shape of the recess 16 inverted and transferred to it.

[0029] Figures 2 to 7 illustrate an embodiment of an adhesive device having a rectangular recess and / or protrusion in the short-side cross-section. However, in other embodiments, the recess and / or protrusion may have an arc-shaped, semi-circular, or triangular cross-sectional shape.

[0030] The height and depth of the uneven shape on the adhesion surface 12 are not limited, but preferably the height of the protrusions 14 or the depth of the recesses 18 are formed to be 0.1 to 5.0 mm, and more preferably 0.5 to 1.0 mm.

[0031] The attachment device 10 is manufactured from polymer materials such as natural resins and synthetic resins, or inorganic materials such as ceramics and non-fired ceramics. Specific examples of polymer materials include ABS resin, polyethylene terephthalate resin, polycarbonate resin, polyvinyl chloride resin, polypropylene resin, nylon resin, polylactic acid resin, and mixtures thereof. Examples of inorganic materials include brick, cement, gypsum, silica, plaster, geopolymers, and mixtures thereof.

[0032] Furthermore, in embodiments of an applicator equipped with a release section on the adhesion surface 12, the release section may be the polymer material, ceramics and / or non-fired ceramics mentioned above, but it is more preferable to use a material that is coated onto the adhesion surface 12. Examples of materials that are coated onto the adhesion surface 12 include cement, plaster, mortar, etc. In addition, by mixing pigments into these materials, the mark formed on the left shell of the oyster can be given a desired color.

[0033] The detachment portion 18 has sufficient adhesion to the attachment surface to prevent it from detaching during spat collection and / or cultivation. On the other hand, if the attachment device 10 is plastic, the detachment portion can be detached from the attachment surface along with the left shell of the oyster by twisting the attachment device 10 when harvesting oysters from the attachment device 10.

[0034] The attachment device 10 and the uneven shape on the attachment surface 12 can be manufactured using molding methods such as injection molding and blow molding, molding methods using molds and resin molds, machining, 3D printing, etc. The release layer 18 can be provided by painting processes such as dipping paint, spray painting, painting using spatulas, brushes, etc., or bonding processes using adhesives or static electricity.

[0035] An embodiment of the oyster farming method using the attachment device of the present invention will be described. In the oyster farming method of the present invention, oyster larvae, i.e., juvenile oysters, are attached to the attachment surface 12 of the attachment device 10, and the oysters are cultivated in the sea or in a tank. Figure 8 illustrates the state in which the attachment devices 10 are arranged to attach juvenile oysters. As shown in Figure 1, the central part of the attachment device 10 has a through hole 20 that penetrates the attachment device 10 from the front to the back. In Figure 8, a string 22 is inserted through the through hole 20, illustrating the state in which three attachment devices 10 are stacked vertically. Spacers 24 having a diameter larger than the diameter of the through hole are provided between the stacked attachment devices 10 to prevent the attachment surface 12 of one attachment device 10 from coming into contact with another attachment device 10. The stacked attachment devices 10 are referred to as a spat collection string.

[0036] The spat collection chain is placed in a sea area where oyster larvae are abundant, or in a tank where oyster larvae are artificially cultivated, and the oyster larvae attach to the attachment surface 12. This process is called spat collection. The attachment devices to which the juvenile oysters have attached are replaced with spacers 24 that are longer than the height of the oyster shells at harvest time, and stacked. Alternatively, the attachment devices may be stacked by inserting them into the gaps in the twist of the rope. This is called a hanging chain, and oyster farming is carried out by hanging the hanging chain in the sea or in a tank. The normal farming period is 1 to 2 years, but the hanging chain may be lifted out of the seawater and exposed to air once or multiple times. This process is called suppression.

[0037] When the oysters grow to harvest size, the hanging strings are lifted out of the seawater for harvesting. If the attachment apparatus 10 is plastic, twisting the attachment apparatus 10 releases the adhesion between the oyster's left shell and the attachment apparatus 10. If the attachment apparatus 10 has a detachment section 18, the detachment section 18 peels off from the attachment surface 12 along with the oyster. As a result, oysters with the inverted, uneven shape of the mark transferred to the left shell can be harvested. If the attachment apparatus 10 is not plastic, the oysters are harvested by physically removing them from the attachment apparatus 10 using a spatula or similar tool. [Examples]

[0038] The present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[0039] An embodiment of the adhesive device of the present invention was manufactured. Embodiment 1 was produced by 3D printing ABS resin into a disc with a diameter of approximately 12 cm and a thickness of approximately 2 mm, and had a series of 0.6 mm high protrusions on the adhesive surface that were horizontally reversed letters "HRO". A photograph of the appearance of Embodiment 1 is shown in Figure 9(A).

[0040] Example 2 is a disc made of PLA resin, approximately 12 cm in diameter and 2 mm thick, which was 3D printed. The adhesive surface has a series of 0.3 mm deep recesses forming the letters "HRO" in reverse. A photograph of the appearance of Example 2 is shown in Figure 9(B).

[0041] In a tank where planktonic oyster larvae were being cultivated, spat collection strings consisting of the attachment devices of Examples 1 and 2 were suspended, and it was confirmed that approximately 20 juvenile oysters (shell length about 0.3 mm) attached to each attachment device. After being cultivated in the tank until the shell length reached 1 mm or more, the spat collection strings were reassembled into suspended strings, and suspended cultivation was carried out at an oyster farm in the Okushiri area of ​​Hokkaido, after which the oysters were harvested after about 12 months.

[0042] Figure 10 shows a photograph of the left shell of a harvested rock oyster. In the figure, (A) is a rock oyster cultivated using Example 1, and (B) is a rock oyster cultivated using Example 2. It was confirmed that the uneven shape of the attachment surface from Examples 1 and 2 was transferred to the left shell of the harvested rock oyster, and that a mark consisting of the letters "HRO" was clearly formed.

[0043] Furthermore, another embodiment was manufactured. Embodiment 3 consists of a rectangular plate of PLA resin with a long side of 15 cm, a short side of 10 cm, and a thickness of 2 mm, on which a series of recesses approximately 0.5 mm deep, resembling the letters "HRO" reversed left and right, are provided on the adhesive surface. Furthermore, yellow cement is applied to the adhesive surface to a thickness of approximately 1 mm. The release portion made of yellow cement is provided in layers so that the entire adhesive surface becomes substantially flat while filling the recesses.

[0044] Example 4 consists of a PLA resin plate with a long side of 15 cm, a short side of 10 cm, and a thickness of approximately 2 mm, on which a series of protrusions approximately 0.5 mm deep, resembling the letters "HRO" reversed horizontally, are provided on the adhesive surface. Furthermore, red cement is applied to the adhesive surface to a thickness of approximately 1 mm. The release section made of red cement is provided in layers along the protrusions. Figure 11 shows photographs of the external appearance of the adhesive devices of Examples 3 and 4.

[0045] In a tank where planktonic oyster larvae were being cultivated, spat collection strings consisting of the attachment devices of Examples 1-4 were suspended, and it was confirmed that approximately 20 juvenile oysters (shell length about 0.3 mm) attached to each attachment device. After being cultivated in the tank until the shell length reached 1 mm or more, the spat collection strings were reassembled into suspended strings, and suspended cultivation was carried out at an oyster farm in the Okushiri region of Hokkaido, after which the oysters were harvested after about 4 months.

[0046] Photographs of harvested rock oysters are shown in Figures 12 and 13. Figure 12 shows rock oysters cultivated using Example 3, with (A) being a photograph of the right shell and (B) being a photograph of the left shell. Figure 13 shows rock oysters cultivated using Example 4, with (A) being a photograph of the right shell and (B) being a photograph of the left shell. In both cases, it was confirmed that the detached portions from Examples 3 and 4 were attached to the left shells of the harvested rock oysters, and that a mark consisting of the letters "HRO" was clearly formed. [Explanation of symbols]

[0047] 10. Attacher 12 Adhesion surface 14 Convex part 16 recesses 18 Peeled section 20 Through holes 22 string 24 Spacers

Claims

1. An attachment device for cultivating aquatic animals with exoshells, The attachment surface of the aquatic animal is provided with an uneven shape, The aforementioned uneven shape is an inverted version of the mark. An attachment device on which the mark is transferred onto the exoskeleton of the harvested aquatic animal.

2. The attachment device according to claim 1, wherein the mark has a function of distinguishing one's own goods from those of others and / or indicating the source.

3. The adhesive device according to claim 1 or 2, further comprising a peeling portion on the adhesive surface that can be peeled off from the adhesive surface.

4. The adhesive device according to claim 1 or 2, wherein the convex portion of the uneven shape is formed from a peelable portion that can be peeled off from the adhesion surface.

5. The adhesive device according to claim 1 or 2, wherein a peeling portion that can be peeled off from the adhesion surface is embedded in the recess of the uneven shape.

6. The aforementioned adhesion surface is a synthetic resin and / or a natural resin. The peeled portion is made of ceramics and / or non-fired ceramics. The adhesive device according to any one of claims 3 to 5.

7. The attachment apparatus according to any one of claims 1 to 6, wherein the aquatic animal belongs to the family Ostreidae.

8. A step of attaching a juvenile aquatic animal having an exoskeleton to an attachment device having an uneven surface on the attachment surface of the aquatic animal, The steps include raising the aquatic animals attached to the attachment device, The process includes the step of harvesting the aquatic animals that have been raised, The aforementioned uneven shape is an inverted version of the mark. The mark is transferred onto the exoskeleton of the harvested aquatic animal. Methods of farming aquatic animals.

9. The method for cultivating aquatic animals according to claim 8, wherein the mark has a function of distinguishing one's own goods from those of others and / or indicating the source.

10. The adhesion device is provided with a peeling portion on the adhesion surface that can be peeled off from the adhesion surface, The mark transferred onto the exoskeleton of the harvested aquatic animal consists of the peeled portion that has been removed from the attachment surface. A method for cultivating aquatic animals according to claim 8 or 9.

11. The convex portion of the aforementioned uneven shape is formed from a peelable portion that can be peeled off from the adhesion surface, The mark transferred onto the exoskeleton of the harvested aquatic animal consists of the peeled portion that has been removed from the attachment surface. A method for cultivating aquatic animals according to claim 8 or 9.

12. The recessed portion of the aforementioned uneven shape is embedded by a peelable portion that can be peeled off from the adhesion surface. The mark transferred onto the exoskeleton of the harvested aquatic animal consists of the peeled portion that has been removed from the attachment surface. A method for cultivating aquatic animals according to claim 8 or 9.

13. The aforementioned adhesion surface is a synthetic resin and / or a natural resin. The peeled portion is made of ceramics and / or non-fired ceramics. A method for cultivating aquatic animals according to any one of claims 10 to 12.

14. The aquaculture method according to any one of claims 8 to 13, wherein the aquatic animal belongs to the family Ostreidae.

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