JP5755457B2 - Heart-shaped shelled oyster, its manufacturing method, and molding tool used for the manufacturing method - Google Patents

Description

  The present invention relates to a technique for forming a shell-shaped oyster into a heart shape by using a molding tool at a growth stage.

Recent oysters are mainly cultivated and are cultivated in various parts of Japan. The applicant's association of the present application also cultivates oysters and is well known by the name of “Kujukushima Kaki” (regional collective trademark).
Oysters are contained in bivalves, and the shell of the two shells that is contained in the shell is recessed to the inside (hereinafter referred to as the “shell”), and the other is slightly flat so as to cover it. (Hereinafter referred to as “lid”). The two oyster shells and lids are connected at two points: the hinges and scallops. It is known that an oyster grows from the hinge side toward the opposite side on the growth end side opposite to the hinge side. A growth line (growth vein) is formed on the surface of the shell according to the growth on the growth end side. This growth line is like a tree ring. When the muscles of the scallops relax, the oysters open their shells around the hinges, that is, ingest food such as plankton that opens at the growth end and floats in seawater, and close the shells when the stalks contract.

  By the way, oysters cultivated in various places have different shell shapes depending on the environment in which they are cultivated, but attempts to artificially make them into specific shapes by letting them grow naturally in aquaculture fishing grounds have not been attempted. The current situation is that nothing has been done.

  The present invention was devised in view of the above-mentioned problems to solve the problems, and the object of the present invention is to provide an overall shell outline of a shelled oyster that has not been considered at all. An object is to provide a heart-shaped shelled oyster that is cultivated to have a specific shape called a heart shape and can increase the commercial value of the shelled oyster, a manufacturing method thereof, and a molding device used for the manufacturing method.

  To achieve the above object, the invention of the heart-shaped shelled oyster according to claim 1 is characterized in that the center of the growth end side of the shelled oyster opposite to the hinge of the shelled oyster is in a non-growth state. Formed into a V-shaped dent, with both sides sandwiching this, it is formed with a convex edge that is substantially rounded toward the growth direction of the shelled oyster, and the shell outline of the shelled oyster is formed into a substantially heart shape as a whole It consists of the means which was made.

  Further, in order to achieve the above-mentioned problems, the invention of the method for producing a heart-shaped shelled oyster according to claim 2 is to provide each oyster being cultured from the fishing ground 8 to 2 months before the oyster harvest period. Take out the center of the growth end side of the shelled oyster that is opposite the hinge of the shelled oyster into a V shape, and attach the shelled oyster with the V-shaped notch in the center The inside of the storage net part is housed and the tip of the hinged side of the shelled oyster is inserted and locked into one of the meshes before and after the storage net part, and the center V-shaped notch is attached to this. A net formed by forming a part of the mesh yarn on both sides of the mesh before and after the storage net part that holds and holds the shell-shaped oyster while inserting and engaging a molding machine having a corresponding V-shaped tip side. The V-shaped notch in the center of the growth end side of the shelled oyster is locked in the thread locking groove. After fixing with the front and rear meshes through the shaper, return to the fishing ground again and continue the cultivation. During the cultivation, the center of the growth end side of the shelled oyster is maintained in a non-growth state by the molding device, and V-shaped. A method of forming into a mold cavity, growing both sides of it into a convex edge with a substantially round shape toward the growth direction of the shelled oyster, and forming the shell outer shape of the shelled oyster as a whole in a substantially heart shape It is made up of.

  In order to achieve the above-mentioned object, the invention of the molding instrument used for the manufacturing method of the heart-shaped shelled oyster according to claim 3 maintains the center of the growth end side of the shelled oyster in a non-growth state. And forming a V-shaped recess, and an attachment netting device having a plurality of storage nets for storing the shelled oysters from the front and the rear, and the front end of the forming device is on the growth end side of the oysters. It is formed in a V-shaped cross section that is engaged with the central V-shaped cutout portion, and both the meshes on the front and rear of the attachment netting from the rear end opposite to the front end side of the V-shaped cross section toward the intermediate side. A mesh thread retaining groove for retaining a part of the mesh thread is formed, and the attachment mesh tool is provided with a plurality of storage mesh portions having open openings on one side surface of the base mesh, and the tip side on the hinge side And the mesh for fixing the molding device inserted and locked in the center V-shaped notch on the growth end side. Those made of means provided number based network and the storage network unit.

  According to the heart-shaped shelled oyster and its manufacturing method according to the present invention, the center of the growth end side of the shelled oyster opposite to the hinge of the shelled oyster is recessed into a non-growth state V-shape. Since both sides of the shell grow into a convex edge that is substantially rounded toward the growth direction of the shelled oyster, the shell outer shape of the shelled oyster can be formed into a substantially heart shape as a whole. Since the heart shape is a well-known shape, and it is an auspicious shape that is generally loved, the shell oyster has such an excellent shape for the first time, thereby increasing the commercial value of the shell oyster. be able to.

  Further, according to the molding tool used for the manufacturing method of the heart-shaped shelled oyster according to the present invention, the center of the growth end side of the shelled oyster is recessed into the non-growing V-shape by the V-shaped molding machine. The shelled oysters are stored in the storage mesh part of the mounting net, and the front and rear ends of the shelled oysters on the hinge side using the mesh before and after the storage mesh part to be stored. The molding machine that molds the center of the side can be held and fixed, and by the cooperative operation of the molding machine and the attachment netting tool, the shell outer shape of the shelled oysters stored in the storage net part as a whole by subsequent cultivation It has a very new and beneficial effect, such as being able to form a substantially heart shape.

(A) is a front view of a shell-shaped oyster having a heart shape showing an embodiment for carrying out the present invention, and (B) is a side sectional view of FIG. (A) is the front view of the molding machine bent into the V shape used for the manufacturing method of the heart-shaped shelled oyster which shows the form for implementing this invention, (B) is the side of the same figure (A) FIG. (A) is a front view of a wooden molding machine used for the manufacturing method of a heart-shaped shelled oyster showing a form for carrying out the present invention, (B) is a side view of the same figure (A), (C) Is a plan view of the same figure (A), (D) is a central sectional view of the same figure (B). It is a partially cutaway perspective view of the attachment netting tool used for the manufacturing method of the heart-shaped shelled oyster which shows the form for implementing this invention. (A)-(B) It is operation | work explanatory drawing in the manufacturing method of the shell-shaped oyster with the heart shape which shows the form for implementing this invention. (A)-(B) It is operation | work explanatory drawing in the manufacturing method of the shell-shaped oyster with the heart shape which shows the form for implementing this invention.

[Heart-shaped shelled oyster]
Hereinafter, a shell-shaped oyster having a heart shape will be specifically described based on an embodiment for carrying out the invention described in the drawings.

  As shown in FIG. 1, the shelled oyster 1 is similar to the conventional shelled oyster described above, and the shell 1a of the two shells 1a, 1b containing the body 1c is on the inner side. It is depressed, that is, the outer side of the shell 1a protrudes in a convex shape toward the outside, and the body 1c is contained inside the depressed portion of the shell 1a. The other lid 1b that covers the inside of the shell 1a so as to cover it is slightly flat.

  The two shells 1a and the lid shell 1b of the shelled oyster 1 are connected to each other at two locations, a hinge 1d and a scallop 1e. As described above, the growth end side 1f of the oyster 1 is located on the opposite side of the hinge 1d, and the growth end side 1f grows from the hinge 1d toward the opposite side.

  The present invention is intended to make the growth end side 1f into a heart shape by utilizing the property that the shelled oyster 1 grows toward the opposite side of the hinge 1d side. However, in the shell-shaped oyster 1 that grows in a heart shape, the two shells 1a and the lid shell 1b do not grow in exactly the same left-right symmetry. It does not take shape. For this reason, in the present invention, the expression of a substantially heart shape is used for the shape.

  The shelled oyster 1 formed in a substantially heart shape that is not a perfect symmetrical heart shape is a center of the growth end side 1f of the shell 1a and the lid 1b when viewed from the front of the shell 1a or the lid 1b. It is molded in a non-growth state by a cooperative operation of a molding machine and a net, which will be described later, and is formed in a V-shaped depression 1g. That is, the V-shaped recess 1g is formed in both the shell 1a and the lid shell 1b, and is recessed toward the hinge 1d. This V-shaped depression 1g corresponds to the V-shaped depression at the center of the upper side of the heart shape.

  The left and right sides of the growth end side 1f of the shell 1a and the lid shell 1b across the V-shaped depression 1g continue to grow by subsequent aquaculture and are substantially rounded convex edges 1h. Is formed. That is, the substantially rounded convex edge 1h is formed on both the shell 1a and the lid shell 1b. The expression that the convex edge 1h is “substantially rounded” is because the tip edge of the round has some small irregularities and is not smooth and not completely rounded. The left and right convex edges 1h correspond to the left and right convex arcs of the V-shaped depression at the center of the upper side of the heart shape.

In this way, the shelled oyster 1 is not grown at the center of the growth end side 1f and grown on the left and right sides thereof, and the growth end side 1f is rounded with a central V-shaped recess 1g and both the left and right sides thereof. Due to the shape of the convex edge 1h, the shell outline as a whole is formed in a substantially heart shape.

[Molding tools used for manufacturing heart-shaped shelled oysters]
Next, based on the form for implementing invention shown in drawing, the shaping | molding instrument used for the manufacturing method of the heart-shaped shelled oyster is demonstrated concretely.

  As shown in FIG. 2 to FIG. 4, the molding tool used for the manufacturing method of the heart-shaped shelled oyster is V-shaped while maintaining the center of the growth end side 1 f of the shelled oyster 1 in a non-growth state. The molding machine 3 is configured to mold the depression 1g, and the mounting net 4 is provided with a plurality of storage nets 6 for storing the shelled oyster 1 from the front and rear.

  The molding device 3 is formed in a V-shaped cross section in which the tip side 31 is engaged with the center V-shaped notch portion on the growth end side 1 f of the oyster 1. As the molding machine 3, a metal or plastic rectangular substrate 32 having a center bent into a V shape (see FIG. 2) or a wooden section 34 with a triangular cross section (see FIG. 3) is used. In the case where the substrate 32 is bent, a portion bent into a V shape or one of the vertices of the triangle in the wooden 34 is the tip side 31 of the molding device 3.

  In the molding machine 3 in which the center of the substrate 32 shown in FIG. 2 is bent into a V shape, for example, aluminum or stainless steel is used as the metal. When this metal or plastic one is used as the molding device 3, it can be reused many times in the manufacturing method of a heart-shaped shelled oyster. In any case, the metal or plastic molding machine 3 has a strength that allows the growth of the growth end side 1f of the shelled oyster 1 to stop its growth and maintain a non-growth state without being deformed by the growth force. Is required.

  The molding machine 3 in which the center of the substrate 32 is bent into a V-shape has four rectangular corners of the rectangular substrate 32 cut in advance into a slant 32a as illustrated, or a rounded shape (not illustrated). It is formed so that it is not injured at the corner when handling it.

  As a V-shaped angle at the center of the substrate 32, for example, a 90-degree angle is generally used, but it may be 70 to 100 degrees. However, as the bending angle becomes a small acute angle, the growth end sides 1f growing on both the left and right sides may approach each other across the molding machine 3, and conversely, As the bending angle increases to a large obtuse angle, the V-shaped recess 1g at the center of the shelled oyster 1 does not become a beautiful V-shape and does not have a substantially heart shape.

  The height of one side of the inclined side surface 32b of the V-shaped molding machine 3 used is, for example, 15 mm. The height of one side of the inclined side surface 32b of the molding device 3 is determined in consideration of the interval between meshes 51 and 61 (to be described later) of the attachment net 4 for fixing the side. In other words, the height is limited to be between the meshes 51 and 61. As will be described later, the internal spacing of the square meshes 51 and 61 is, for example, 20 mm × 20 mm, and the molding device 3 is sized to be inserted into the meshes 51 and 61. The length of the molding device 3 is, for example, 50 mm, but if it is too short, the attachment to the meshes 51 and 61 becomes troublesome.

  A mesh thread locking groove 33 is formed from the rear end opposite to the front end side 31 of the V-shaped cross section of the molding device 3 toward the intermediate side. The mesh thread locking groove 33 is formed in the center portion in the length direction of the left and right inclined side surfaces 32b bent in a V shape in the direction perpendicular to the length direction. The depth of each of the left and right mesh thread locking grooves 33 is, for example, 5 mm from the opening edge of the groove. In addition, when the molding device 3 is arranged in a V-shape that is symmetrical with respect to the plane, the straight line connecting the bottoms of the left and right mesh thread locking grooves 33 is substantially parallel to the plane. Each mesh thread locking groove 33 is formed.

  The mesh thread locking groove 33 formed in the central portion in the length direction of the molding machine 3 is held in front and rear, which will be described later, when used from both sides with the surface of the shell 1a and the lid shell 1b of the shelled oyster 1 sandwiched between them. A part of the mesh yarns 51a, 61a of both the front and rear meshes 51, 61 coming to a location corresponding to the growth end side 1f of the shell oyster 1 in the meshes 51, 61 is inserted into the groove bottom portion. Stopped. For this reason, the groove width of the mesh thread locking groove 33 is, for example, 1 mm so that both the mesh threads 51a and 61a can be inserted and locked. When the diameters of the mesh yarns 51a and 61a are larger than this, the groove width becomes wider accordingly.

  On the bottom side of the mesh thread locking groove 33 of the molding machine 3, a bottom side groove 33a formed in a wedge shape obliquely upward toward the left and right groove width directions is formed. Both mesh threads 51a and 61a inserted and locked on the bottom side of the mesh thread locking groove 33 are not easily detached by being locked on the tip side of the left and right bottom side grooves 33a.

  Further, since the distance between the tips of the left and right bottom side grooves 33a formed on the bottom side of the mesh thread locking groove 33 is about 4 mm, for example, the growth end side 1f of the shelled oyster 1 is sandwiched from the front and the back. The mesh yarns 51a and 61a of the meshes 51 and 61 can be moved back and forth at intervals of about 4 mm toward the surface side of the shell 1a and the lid shell 1b. In this case, if the interval of about 4 mm is too wide, the molding device 3 is easily displaced, and it becomes difficult to form the substantially heart-shaped shelled oyster 1 having a good shape.

  For this reason, since the shell 1a of the shelled oyster 1 and the growth end side 1f of the lid shell 1b can be opened at an interval of about 4 mm, the shelled oyster 1 has a plankton floating on the seawater with the growth end side 1f open. And so on. This prevents the growth of the left and right convex edges 1h on the growth end side 1f due to insufficient food intake and prevents the left and right convex edges 1h on the growth end side 1f from being formed into a substantially heart shape. There is nothing.

  In the wooden 34 molding machine 3 shown in FIG. 3, in the manufacturing method of the heart-shaped shelled oyster, it is disposable each time. Wooden is cheaper than metal or plastic, and there is no problem of environmental pollution even if it is dumped into the ocean. However, like the molding machine 3 using the substrate 32, this wooden 34 molding machine 3 also stops the growth of the portion without being deformed by the growth force during the growth of the growth end side 1f of the shelled oyster 1. Strength that can be maintained in a non-growth state is required.

  The wooden 34 molding machine 3 is less likely to be injured at the corner 34a than the molding machine 3 of the substrate 32. Therefore, the necessity of cutting the corner 34a obliquely or forming a rounded shape is not necessary. Although it is low, the corner portion 34a may be cut or rounded.

  The molding machine 3 made of wood 34 is formed in, for example, an isosceles triangle shape with the tip side 31 as a vertex, and the angle of the V-shaped tip side 31 is a molding machine 3 that is used by bending the substrate 32. Similarly, for example, the angle of 90 degrees is common, but 70 degrees to 100 degrees is also possible. However, as the front end side 31 becomes a small acute angle, the growth end sides 1f growing on both the left and right sides may approach each other across the molding machine 3, and conversely As the side 31 becomes an obtuse large angle, the V-shaped depression 1g at the center of the shelled oyster 1 does not become a beautiful V-shape and does not have a substantially heart shape.

  The height of one side of the inclined side surface 34b of the molding device 3 made of wood 34 is, for example, 15 mm. The height of one side of the inclined side surface 34b of the molding machine 3 is determined in consideration of the distance between the meshes 51 and 61 (to be described later) of the attachment net 4 for fixing the side surface 34b. In other words, the height is limited to be between the meshes 51 and 61. As will be described later, the internal spacing of the square meshes 51 and 61 is, for example, 20 mm × 20 mm, and the molding device 3 is sized to be inserted into the meshes 51 and 61. The length of the molding device 3 is, for example, 50 mm, but if it is too short, the attachment to the meshes 51 and 61 becomes troublesome.

  A mesh thread locking groove 35 is formed from the rear end surface 34c on the opposite side of the front end side 31 of the V-shaped section of the wooden 34 forming device 3 toward the intermediate side. The mesh thread locking groove 35 is formed in the center portion in the length direction of the left and right inclined side surfaces 34b and the rear end surface 34c in the direction perpendicular to the length direction. The depth of the mesh thread locking groove 35 is, for example, 5 mm from the opening edge of the groove of the inclined side surface 34b along the inclined side surface. Further, when the forming device 3 is arranged in a V-shape symmetrical to the plane, the bottom of the mesh thread locking groove 35 is formed so as to be substantially parallel to the plane.

  When used, the mesh thread retaining groove 35 formed in the center part of the wooden 34 in the longitudinal direction of the molding machine 3 holds the shell 1a and the shell 1b of the shelled oyster 1 from both sides. A part of the mesh yarns 51a, 61a of both the front and rear meshes 51, 61 coming to a position corresponding to the growth end side 1f of the shelled oyster 1 in the front and rear meshes 51, 61 described later is inserted and the groove bottom Locked to the part. For this reason, the width of the mesh thread locking groove 35 is, for example, 1 mm so that both mesh threads 51a and 61a can be inserted and locked. When the diameters of the mesh yarns 51a and 61a are larger than this, the groove width becomes wider accordingly.

  Formed on the bottom side of the mesh thread locking groove 35 of the wooden 34 forming machine 3 are bottom side grooves 35a formed in a wedge shape obliquely upward toward the left and right groove width directions. Both mesh yarns 51a and 61a inserted and locked on the bottom side of the mesh yarn locking groove 35 are not easily detached by being locked on the tip side of the left and right bottom side grooves 35a.

  Further, since the distance between the tips of the bottom side grooves 35a formed on the bottom side of the mesh thread locking groove 35 is about 4 mm, for example, each mesh 51 sandwiching the growth end side 1f of the shelled oyster 1 from the front and back. , 61 can be moved back and forth at intervals of about 4 mm toward the surface side of the shell 1a and the lid 1b. In this case, if the interval of about 4 mm is too wide, the molding device 3 is easily displaced, and it becomes difficult to form the substantially heart-shaped shelled oyster 1 having a good shape.

  For this reason, since the shell 1a of the shelled oyster 1 and the growth end side 1f of the lid shell 1b can be opened at an interval of about 4 mm, the shelled oyster 1 has a plankton floating on the seawater with the growth end side 1f open. And so on. This prevents the growth of the left and right convex edges 1h on the growth end side 1f due to insufficient food intake and prevents the left and right convex edges 1h on the growth end side 1f from being formed into a substantially heart shape. There is nothing.

  The attachment netting tool 4 holds and holds the shell oyster 1 from the front and back, fixes the distal end side on the hinge 1d side, and inserts and locks it at the center V-shaped notch portion on the growth end side 1f. The shell-shaped oyster 1 is formed and held in a heart shape. As shown in FIG. 4, the attachment net 4 includes a plurality of, for example, eight stages of storage nets 6 for storing the shelled oysters 1 from the front and rear.

  For example, the mounting net 4 includes eight stages of storage nets 6 in the vertical direction on one surface of a rectangular base net 5, for example. Each storage net 6 is formed with an open port 62 whose one side, for example, the upper side in FIG. 4, is opened, and the shell-shaped oyster 1 formed in a heart shape is stored and fixed from the open port 62 to the inside. It has become.

  In the rectangular base net 5, mesh threads 51a are assembled, for example, at equal intervals in the vertical and horizontal directions, and a large number of rectangular meshes 51 are formed by the vertical and horizontal mesh threads 51a. The internal spacing of each square mesh 51 is, for example, 20 mm × 20 mm. The uppermost side 52 of the base net 5 is formed in a hard rod shape, and has a strength that does not deform even if the uppermost side 52 of the base net 5 to which many shell oysters 1 are attached is hung from the sea by a rope or the like. Yes. In addition, when hanging the base net 5 upside down, the lowermost side 53 is comprised by the hard rod shape.

  For example, mesh yarns 61a are assembled at equal intervals in the vertical and horizontal directions on the surface side of each of the horizontally long storage nets 6, and a large number of rectangular meshes 61 are formed by the vertical and horizontal mesh yarns 61a. The internal spacing of each square mesh 61 is, for example, 20 mm × 20 mm, similar to the mesh 51 described above.

Each shelled oyster 1 stored inside the storage net 6 from each opening 62 is inserted into the mesh 51 of the base net 5 or one of the nets 61 of the storage net 6 at the tip side on the hinge 1d side. Fixed. Further, both the net yarn 61a on the opening 62 side of the storage net portion 6 and the net yarn 51a of the base net 5 corresponding to this are inserted into the net yarn engaging groove 33 or the net yarn engaging groove 35 of the molding machine 3. By being locked, the molding device 3 inserted and locked in the center V-shaped cutout portion on the growth end side 1 f of each shelled oyster 1 stored in the storage net 6 is provided in each of the attachment nets 4. It is fixed to the opening 62 side of the storage net 6 and simultaneously the opening 62 of the storage net 6 is closed.

[Production of heart-shaped shelled oysters]
Then, based on the form for implementing invention shown in drawing, the manufacturing method of the heart-shaped shelled oyster is demonstrated concretely.

  Eight to two months before the oyster harvest season, each oyster being cultivated is taken out from the seawater of the fishing grounds. The reason why there is a range of 8 months to 2 months is that there are fluctuations depending on the water temperature and tide level in the area. This is also because there is some variation in the shipping time.

  For example, in the case of a oyster oyster in winter, oyster larvae born around July are purchased around November and farmed. Oyster larvae are attached to the surface of scallop shells and cultured.

  Then, from around October of the following year, each oyster being cultivated is taken out of the seawater of the fishing ground and taken out, and work for making a heart-shaped shelled oyster 1 is started.

  As a work start time, it is necessary that the water temperature does not fluctuate stably, that is, the daily fluctuation of the water temperature is within 2 degrees. If the fluctuation of the water temperature is not stable, it will die or the heart-shaped shelled oyster 1 will not work well.

  Since the surface of the shelled oysters pulled up from the sea water is stuck, remove it with a hand cleaner, for example.

  With the cover shell 1b side of the shelled oyster 1 on the front side, the shell 1a side on the back side, and the center of the growth end side 1f on the opposite side of the hinge 1d of the shelled oyster 1 with scissors, for example, a depth of 5 mm to 10 mm Cut out into a V-shape. A V-shaped cutout portion 11 is formed at the center of the growth end side 1f (see FIG. 5A).

  The shell-shaped oysters 1 formed by the V-shaped cutout portions 11 are respectively stored in the storage net 6 through the opening 62, and the tip portions on the hinges 1d side of the shell-shaped oysters 1 are arranged on the front and rear sides thereof. The mesh 61 is inserted into and locked in either the mesh 61 of the storage mesh section 6 or the mesh 51 of the base mesh 5 and fixed by the mesh 61 or the mesh 51 (see FIG. 5B).

  A molding machine 3 having a V-shaped tip side 31 corresponding to this is inserted into a V-shaped cutout portion 11 at the center of the shelled oyster 1 whose tip is fixed inside the storage net 6. Match. Since the molding machine 3 has a height of about 15 mm as described above, the rear end side of the molding machine 3 protrudes from the V-shaped cutout portion 11 (see FIG. 6A).

  A net formed on the molding machine 3 with both of the net yarn 61a on the opening 62 side of the storage net part that holds the oyster 1 with the shell sandwiched therebetween and the net yarn 51a of the base net 5 at the location corresponding thereto. Each thread is locked in the thread locking groove 33 (see FIG. 6A).

  Thus, both the net yarn 61a on the opening 62 side of the storage net portion 6 and the net yarn 51a of the base net 5 at the location corresponding thereto are inserted and locked in the net yarn locking groove 33 of the molding machine 3. Thus, the molding machine 3 inserted and locked in the center V-shaped cutout portion on the growth end side 1 f of each shelled oyster 1 stored in the storage net 6 is provided for each storage net 6 of the attachment net 4. It is fixed to the opening 62 side. Further, the opening 62 is closed.

  After fixing the V-shaped notch portion 11 at the center of the growth end side 1f of the shell oyster 1 with the mesh yarns 61a and 51a of the meshes 61 and 51 before and after the attachment netting tool 4 through the molding device 3, Return to the fishing ground and continue farming for 2 to 8 months until harvest. In the case where the farming is continued by being submerged in seawater of a fishing ground, the growth end side 1f of the shelled oyster 1 to which the molding device 3 is locked may be directed upward, or conversely.

  During the harvest season, the shelled oysters 1 that have been submerged and cultured in the seawater of the fishing grounds are raised. Each shelled oyster 1 grows inside the storage net 6 of the mounting net 4, and each shelled oyster 1 grown is inserted into a V-shaped recess 1g on the tip side of the hinge 1d and the growth end side 1f. It is difficult to take out the formed molding machine 3 by fixing it with the mesh yarns 61a and 51a of the meshes 61 and 51 before and after the storage mesh part 6. For this reason, the net yarns 61a and 51a of the front and rear meshes 61 and 51 are cut, and the grown shelled oysters 1 are taken out from the inside of the storage net part 6 (see FIG. 6B).

  During this cultivation, the center of the growth end side 1f of the shelled oyster 1 is maintained in a non-growth state by the molding machine 3, so that the V-shaped notch portion 11 is inhibited from growing and formed into a V-shaped depression 1g. The On the other hand, since both sides of the oyster 1 continue to grow in the growth direction of the shelled oyster 1, it can be grown to a substantially rounded convex edge 1h.

  As a result, the shell outer shape of the shelled oyster 1 can be formed in a substantially heart shape as a whole.

  The present invention is not limited to the embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Oyster with shell 1a Shell 1b Cover shell 1c Body 1d Hinge 1e Shell pillar 1f Growth end side 1g V-shaped dent 1h Convex edge 11 V-shaped notch 3 Molding device 31 Tip side 32 Substrate 32a Inclined side 32b 33 Net thread retaining groove 33a Bottom side groove 34 Wooden 34a Corner portion 34b Inclined side surface 34c Rear end face 35 Net thread retaining groove 35a Bottom side groove 4 Attaching net 5 Base net 51 Net 51a Net thread 52 Uppermost side 53 Lowermost side 6 Storage net Part 61 mesh 61a mesh thread 62 opening

Claims (5)

The center of the growth end side of the shelled oyster, which is the opposite side of the hinge of the shelled oyster, is formed in a non-growth-shaped V-shaped depression, and both sides of the oyster are in the direction toward the growth direction of the shelled oyster. A shell-shaped oyster with a heart shape, which is formed on a rounded convex edge and the shell outline of the shell-shaped oyster is generally formed into a heart shape. Eight to two months before the oyster harvest season, each oyster under cultivation is removed from the fishing ground, and the center of the growth end side of the shelled oyster opposite to the hinge of the shelled oyster is cut into a V shape. The shell-shaped oyster having the V-shaped cutout at the center is housed in the storage mesh portion of the attachment netting device, and the shell-shaped oyster hinge is placed in any mesh before and after the storage mesh portion. A storage network that inserts and engages a front end portion on the side, inserts and engages a molding machine having a V-shaped front end corresponding to the center V-shaped notch, and sandwiches the shell-shaped oyster. Part of the mesh thread on both sides of the mesh before and after the part is respectively locked in the mesh thread locking groove formed in the molding machine to form the center V-shaped notch on the growth end side of the shelled oyster After fixing the front and rear meshes through the vessel, return to the fishing ground again and continue farming. The center of the growth end side of the oyster is kept in a non-growth state by a molding machine and formed into a V-shaped recess, and the convex edge is rounded with both sides facing the growth direction of the shelled oyster. A process for producing a heart-shaped shelled oyster, characterized in that the shell outer shape of the shelled oyster is generally formed into a heart shape. The molding tool used for the manufacturing method of the heart-shaped shelled oyster according to claim 2 includes a molding machine for molding the shell-shaped oyster into a V-shaped recess while maintaining the center of the growth end side of the shell-shaped oyster in a non-growth state, and a shell It comprises an attachment netting tool provided with a plurality of storage nets for storing the oysters from the front and the rear, and the former is engaged with a V-shaped notch at the center on the growth end side of the oysters. A mesh thread locking groove that is formed in a letter-shaped cross section and that latches part of the mesh thread on both the front and rear meshes of the attachment mesh tool from the rear end opposite to the tip side of the V-shaped section toward the middle side The mounting net has a plurality of storage nets each having an open port on one surface of the base net, and is fixed to the distal end side of the hinge side and has a V-shaped cut at the center on the growth end side. A large number of the meshes for fixing the molding machine inserted and locked in the notch are provided in the base mesh and the storage mesh part. Forming tool to be used in the shell with oyster production method in which the heart-shaped to be a butterfly. 4. A heart-shaped shelled oyster according to claim 3, wherein bottom side grooves formed obliquely upward toward the left and right groove width directions are respectively formed on the groove bottom side of the mesh thread locking groove of the molding machine. Molding equipment used in the manufacturing process. The molding machine is formed in a V-shaped cross section in which the center side of a metal or plastic substrate is bent into a V shape and the tip side is engaged with the center V-shaped notch on the growth end side of the oyster. A molding tool for use in the method for producing a heart-shaped shelled oyster according to claim 3.

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