Rock oyster cultivation method and rock oyster cultivation tool

Abstract

To provide an oyster cultivation method and an oyster raising tool which suppress predation damage by fish at the time of oyster larvae cultivation in the sea and reduce the number of attached organisms. [Solution] A method of cultivating oysters in the sea, characterized in that a rectangular sheet (11) with a mesh-like perforated surface and symmetrical curved depressions is attached to a hanging rope (R) that is suspended vertically in the sea, with its symmetry line (11m) facing vertically, and the oyster juveniles are placed inside the curved depression with the apex of the shell pointing vertically upward, and the juveniles are also symmetrical to match the symmetry of the curved depression, with the normal direction of their outer shells facing the diameter of the hanging rope (R), and then fixed in place for underwater cultivation.

Description

[Technical Field]

[0001] The present invention 、 It prevents damage to young shellfish caused by fish and reduces the number of attached organisms. , outside The heart-shaped design increases consumers' desire to purchase. Small size Making it possible to cultivate rock oysters rock Oyster farming methods and rock Regarding oyster rearing equipment. [Background technology]

[0002] Traditionally, when cultivating oysters, especially rock oysters, the seedlings are released into the ocean, and then cultured in the sea for about two years in clumps on the seedling trays, and then the individual oysters are separated and attached directly to ear hangings or ropes, and cultured again in the sea. After that, they are cultured for one to two years, or in some cases, three years, and then landed (harvested) and shipped at the appropriate time, taking into account their size.

[0003] However, the conventional technology has the following problems. First of all, it is known that it is best to raise oysters individually from the stage when their shells are as small as possible. This is because, since they do not come into contact with each other, they can eat plankton well, which increases their productivity and also helps them to develop a regular shape. In conventional farming methods, whether they are grown on a seedling tray, or by ear hanging or direct attachment to ropes, small oysters are subject to significant damage from fish. One way to prevent this is to surround the farming area with nets, but in this case, if the nets become clogged and the tide slows down, the fish will not get full of meat, so the nets must be pulled up regularly to remove and wash any attached seaweed, which is a very time-consuming process. Furthermore, in ear-hanging farming, the oysters are simply tied to ropes and sway freely with the waves, so the bottom of their shells grows thicker as they try to attach themselves, resulting in smaller meat for their size and lowering their commercial value.In addition, the shaking causes the oysters to close their shells, preventing them from eating food, which also leads to poor meat production. Alternatively, single-sheet aquaculture, in which the fish are placed in cages, can be carried out, but this is costly and, as mentioned above, requires the effort of removing and cleaning the seaweed and other adhesions. In particular, in the case of cages, the entire surface is covered, so the impact of adhesions is enormous. Furthermore, while Pacific oysters are primarily distributed shucked, rock oysters are primarily distributed with their shells still attached. Therefore, after harvesting, the stubborn attached organisms (mussels, sea squirts, sponges, etc.) must be removed using a grinder, which can sometimes reach the same amount as the rock oysters themselves, which is a time-consuming process. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2023-64432 [Patent Document 2] Patent Publication No. 2012-152179 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in view of the above, rock When cultivating oysters underwater, it is important to prevent damage to the young oysters by fish and to ensure that there are few attached organisms. , written by Excellent workability Ta, Rock oysters of nourishment breeding techniques The purpose is to provide the techniques. The objective of the present invention is to provide a technology for inexpensively and easily cultivating small, heart-shaped oysters that are homogeneous, have a high yield, are short until shipment, are easy to convert into cash, have little variation, and stimulate purchasing desire. [Means for solving the problem]

[0006] The method according to claim 1 S-size rock The oyster cultivation equipment is made of a flexible mesh-like synthetic resin. Noshi Road was cut into a rectangle It is formed from a rectangular sheet body, rock For attaching oyster larvae to cultivate them underwater rock An oyster raising device, rectangle Both ends of one side of the sheet body Using cable ties through the mesh holesTo close it rectangle The sheet body is bent to form a pair of rising portions, and opposing sides are opened wide to form curved recesses formed symmetrically on the left and right sides, and on the inside of the curved recesses, Rocks with a major axis between 2cm and 5cm The oyster shell apex is on the rising side, and the oyster shell is also symmetrical to match the symmetry of the curved depression. rectangle When the normal direction of the lid is aligned perpendicular to the symmetrical line passing through the center of the sheet and the sheet is fixed and cultivated, rock As the oyster grows, it interferes with the long diameter end of the cap and the shell, S size rocks weighing 200g to 250g oyster of So that the outer shape is heart-shaped, Prismatic body to rectangle It is erected from the sheet body and used for hanging ropes that are hung vertically during underwater aquaculture. rock The oysters were stuck rectangle The symmetry line and the corresponding line are located at a position above the center of gravity of the seat body. hanging The rope can be passed through the mesh holes and tied together with a single tie band, making it possible to attach it. 。

[0007] The small rock oyster cultivating device according to claim 2 is the small rock oyster cultivating device according to claim 1, wherein the prismatic body is rectangle Sheet body and fasten it with screws using the mesh holes. It is characterized by being erected.

[0008] The method for cultivating small rock oysters according to claim 3 is as follows: Flexible synthetic resin mesh Noshi Road was cut into a rectangle Formed from a rectangular sheet Rock Oyster rearing equipment A method for cultivating rock oysters underwater, comprising: Both ends of one side of the sheet body Using cable ties through the mesh holes To close it rectangle The sheet body is bent to form a pair of rising sections, and the opposing sides are opened wide to form an open section, which is symmetrical. Forming a curved depression , inside the curved recess, Rocks with a major axis between 2cm and 5cm The oyster shell apex is on the rising side, and the oyster shell is also symmetrical to match the symmetry of the curved depression. rectangle The normal direction of the lid shell is aligned perpendicular to the symmetry line passing through the center of the sheet body and fixed. , and rocks As the oyster grows, the longer ends of the exoskeleton and the shell interfere with each other. and rocks oyster of The outer shape is a heart shape rectangle Sheet body and secure it with screws using the mesh holes to create a rectangle. From the seat body Prismatic body Established, lead Compared to the hanging rope that is hung directly, rock The oysters were stuck rectangle The symmetry line and the corresponding line are located at a position above the center of gravity of the seat body. hanging The rope is passed through the mesh holes and tied together with a cable tie. S size: 200g-250g Under the sea Characterized by aquaculture .

[0009] That is, Book The invention curved depression This covers the young oysters, preventing them from being eaten, and the mesh fabric allows for good tidal flow, reducing the amount of attached organisms. In particular, since it is an open type that does not cover the entire perimeter, it allows for good tidal flow and reduces the absolute amount of attached organisms. 。 Hanging Attachment to the lower rope can be done easily and inexpensively using cable ties that utilize the mesh holes. The attachment of the juvenile oysters is achieved by raising cement-based adhesives such as kaidelite. curved depression One example is a method in which the shell is lifted from the surface and part of the shell is fixed. 。 The present invention also provides a simple Convenient and inexpensive to manufacture Mesh sheet This can reduce the cost of aquaculture. That is, Rectangular sheets can be cut out from a large sheet, which contributes to the realization of inexpensive aquaculture. Two points can be easily connected by a cable tie through the mesh holes. 。 The present invention also The corners facing the growth direction create a heart-shaped shape. The major axis can also be expressed as the shell length. Furthermore, if the young oyster is properly attached with bilateral symmetry and the normal direction of the double shell surface horizontal, the oyster will continue to elongate or grow vertically downward while maintaining its current position, and will form a heart-shaped outline with a split in the middle. The term "prism" is used in a broad sense, and is not particularly limited as long as it is a structure that includes two surfaces that are roughly 90 degrees apart, such as an L-shaped metal fitting (it can also be expressed as an inverted V-shaped interference fixture or a Λ-shaped interference fixture). The material must have a hardness that can resist the growth of oysters (shell growth). In addition, the mesh holes can be used to do It can be fastened with screws, and the rectangular pillar can be easily erected. Also, the radial direction is in a broad sense, and does not strictly require a positional relationship of 90 degrees with respect to the extension direction of the rope, but it is sufficient if it is oriented toward the outside of the rope. The heart shape is sufficient if it can be seen when the lid is viewed in a plane. The present invention also provides Mesh fabric for ease of use Well hung Aquaculture can . The center of gravity of the holder to which the oysters are attached at the time of harvest refers to the center of gravity of the holder to which the oysters have been cultivated until the time of harvest. Since the size at the time of harvest is estimated in advance, the oysters can be fixed in a uniform position. Note that arranging the normal direction of the lid shell perpendicular to the line of symmetry passing through the center of the sheet body does not mean a twisted relationship, but rather means that the normal direction is oriented in the radial direction when a cylinder is imagined with the line of symmetry as its axis. [Effects of the Invention]

[0010] According to the present invention ,rock It is possible to provide an oyster cultivation method and oyster cultivation tool that suppress predation by fish at the time of oyster larvae cultivation in the sea and reduce the number of attached organisms. Furthermore, it is possible to provide technology for cultivating oysters that is easy to work with and has high added value. [Brief explanation of the drawings]

[0011] [Figure 1] 1A and 1B are a front view, a back view, and a right side view of the S-size rock oyster cultivating device of the present invention before assembly. [Figure 2] FIG. 1 is a front view of the S-size rock oyster cultivating device of the present invention after assembly. [Figure 3]This is an explanatory diagram showing how baby oysters are attached to an S-size rock oyster rearing device. [Figure 4] This is a front view of a heart-shaped shipping-sized rock oyster attached to an S-sized rock oyster rearing device. Note that for the sake of convenience, the figures are not drawn to exact scale. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, the line of symmetry referred to in the claims appears as a center line 111. In addition, the prismatic body referred to in the claims appears as a prismatic body 12. Similarly, the rectangular sheet body referred to in the claims appears as a rectangular sheet 11 in this embodiment. Here, the present invention S-size rock We will explain the shape of the oyster cultivation equipment, how it is attached to the rope, and how to cultivate small, heart-shaped rock oysters.

[0013] FIG. 1 shows the structure of the present invention. S-size rock 2 is an explanatory diagram of the oyster rearing device, (a) is a front view before assembly, (b) is a rear view, and (c) is a right side view before assembly. S-size rock This is a perspective view of the oyster cultivating device after assembly. Note that the vertical and horizontal irregularities of the cut edge, the mesh, and the sheet thickness are omitted. Hereafter, for the sake of simplicity, the S-size rock oyster cultivation tool and the S-size rock oyster cultivation method will be referred to simply as the rock oyster cultivation tool and the rock oyster cultivation method, as appropriate.

[0014] rock The oyster cultivating device 1 has a basic structure in which a rectangular sheet 11 measuring 14 cm long x 14 cm wide x 2 mm thick is attached with a square pillar 12 measuring 2 cm x 2 cm x 4 cm. The rectangular sheet 11 is preferably made of polypropylene, polyethylene, or high-density polyethylene, as these are inexpensive and have a certain degree of light resistance and chemical resistance. The rectangular pillars 12 can also be made of high-density polyethylene, but a harder acrylic resin may also be used to withstand the pressure of oyster shell growth. In any case, the materials for the rectangular sheet 11 and the rectangular pillars 12 can be determined appropriately according to the characteristics of the aquaculture area and the hanging period.

[0015] The rectangular sheet 11 is also formed in a mesh shape with 7 mm x 7 mm holes evenly spaced (in a plan view, the width of the horizontal and vertical lines is 3 mm). The rectangular pillar 12 is attached to the back of the rectangular sheet 11 at a position 1.5 cm from the bottom above the vertical center line 11 m of the rectangular sheet 11 with a washer 121, and is firmly fixed with a screw 122 so that the rectangular pillar 12 stands upright against the rectangular sheet 11. At this time, the corner of the rectangular pillar 12 is positioned at the center line 11 m, and the rectangular pillar 12 is fixed to the position before assembly. rock The oyster cultivation device 1 is formed so as to be symmetrical on both sides with respect to the center line 11 m.

[0016] When assembling, the mesh holes on the left and right sides of the upper side are fastened with binding bands 111. As a result, the upper side is bent and rises relative to the opposing lower side, forming a rising portion 11u, and the lower side is slightly curved but forms a wide, open portion 11d. rock The oyster rearing device 1 is symmetrical.

[0017] Figure 3 shows the young oysters rock 4 shows the state of attachment to the oyster cultivating tool 1, with (a) being a front view and (b) being a right side view showing the inside of the curved recess with the rectangular sheet 11 on the right side omitted. Also, for the sake of convenience, the vertical and horizontal irregularities of the cut edge and the mesh are omitted in FIG.

[0018] rock When viewed with the apex of the shell facing up toward the outer shell (right shell), the shape of a spat oyster is roughly symmetrical. Here, we will explain the case of spat oysters with a major axis of 3 cm, but in the method of the present invention, rock oysters with a major axis of 2 cm to 5 cm are used. If the major axis is less than 2 cm, even a slight misalignment can cause misalignment during growth, increasing the chances of the spat losing their balanced heart shape. If the major axis exceeds 5 cm, it takes a long time to cultivate them to that size, resulting in higher overall costs.

[0019] When attaching, the shell apex should be on the upper side (the rising part 11u) and the juvenile shell should be symmetrical. rockThe oyster rearing device 1 is fixed symmetrically to the left and right sides so that the center line 11m and the normal direction of the oyster shell plane are perpendicular to each other (so that the oyster shell plane and the center line 11m are parallel and do not intersect). By adopting this positional relationship, during underwater cultivation, rock The oyster grows straight down, and the center of the tip of the oyster shell reaches the square prism 12, forming a heart shape.

[0020] When fixing, the kaidelite is piled up on the rectangular sheet 11 approximately 4 to 6 cm from the top edge of the center line 11 m, and the shell (left shell) is placed on this.

[0021] The young oysters were attached rock Using a position 6 to 7 cm above the center line 11 m of the oyster cultivation device 1 as a guide, pass the cable tie 112 through the mesh hole and attach it to the hanging rope R. rock Attach the oyster cultivation tool 1. In this position, the weight of the square pillar 12 will also help the oysters grow until they form a heart shape. rock Even when the oysters are grown, the mounting position is above the center of gravity, so it is possible to Small size Even down to the size, the center line 11 m always faces vertically downwards by just fastening the cable tie 112 at one point. rock The oysters are stable, grow facing downwards correctly, and develop a beautiful heart shape. Small rock It becomes an oyster.

[0022] The hanging rope R is a polypropylene rope with a diameter of 2 cm. rock The intervals at which the oyster cultivating devices 1 are hung can be set as appropriate, for example, at intervals of 20 cm. Note that a predetermined number of hanging ropes R themselves are hung from the culture raft as appropriate (not shown).

[0023] As shown above rock Rock oysters grown in the oyster growing tool 1 are harvested when they are small size, weighing approximately 200 to 250 g (the long diameter of the small size oysters without the square pillar 12 is approximately 10 cm to 14 cm). At this small size, the rock oysters grow into a well-balanced heart shape (conversely, in order to harvest heart-shaped rock oysters with good balance, rock The size of the oyster cultivation equipment is set. The period of underwater cultivation is approximately one year, depending on when the cultivation begins. growth You can harvest it depending on the situation. Figure 4 shows the heart-shaped packaging in shipping size. Small rock The oysters showed signs of being attached to the oyster rearing device.

[0024] Rock oysters are larger than Pacific oysters, so demand is concentrated on the larger ones. Therefore, the larger the oyster, the higher the price per weight, and the higher the price (the higher the price they sell for). On the other hand, small oysters have a lower price per weight and are relatively light, so even if you could sell a large quantity, it has traditionally been difficult to make a profit.

[0025] On the other hand, larger rock oysters require a longer cultivation period, and the yield decreases due to various factors. In other words, there are greater uncertainties regarding the harvest. On the other hand, small oysters have a very high yield, and the time from underwater cultivation to landing and shipping is short, allowing them to be converted into cash quickly.In addition, there is little variation in growth up to small size, and they are less likely to warp or bend, maintaining a symmetrical shape, making it possible to cultivate uniform heart-shaped oysters. In addition, up to about S size, growth can be predicted, making planned farming possible, and conversely, year-round harvesting and shipping is also possible. therefore, S-size rock Rock oyster cultivation using the oyster cultivation device 1 is an inexpensive and simple cultivation method that can grow small-sized rock oysters, which have previously had low liquidity, into a heart shape that stimulates purchasing desire, and also enables planned production, making it possible to increase profitability.

[0026] The procedure for assembling the oyster larvae to the hanging rope R is as follows: Step S1: First, a large number of rectangular sheets 11 of 14 cm x 14 cm are cut out from a large sheet of mesh fabric. Step S2: Place the rectangular pillar 12 1.5 cm above the center of the bottom side of the rectangular sheet 11 and fix it from the back with a washer 121 and a screw 122. Step S3: Apply the kaydelite to the rectangular sheet 11, approximately 3 cm below the center of the top edge, to form a mound of about 2 cm. Step S4: The mesh holes at the left and right ends of the upper side are tightened with cable ties 111 to form the rising portion 11u (to form a curved recess). Note that in order to maintain the posture (to prevent the product from tipping over), the work is carried out while the product is placed on a corrugated board as appropriate. Step S5: The previously prepared baby shells (3 cm in long diameter) are arranged symmetrically on the rectangular sheet 11 and so that the center line 11m and the normal direction of the shell surface are perpendicular to each other, and the bottom of the shell is embedded in the kidelite. Step S6: Allow to cure for about half a day, being careful not to let it dry out, until it hardens to the required adhesive strength. Step S7: The rectangular sheet 11 with the juvenile shells is fastened to the hanging rope R using a cable tie 112. This is done at a position 5 cm below the center of the top side of the rectangular sheet 11. Step S8: After the predetermined number of ropes are fixed, the suspension rope R is suspended from the aquaculture raft into the sea.

[0027] The above example was explained using rock oyster juveniles with a long diameter of 3 cm, but when cultivating small rock oysters weighing 200g to 250g, the dimensions of the rectangular sheet 11 can be set appropriately to 11 to 16cm in length and width, and the distance between the fixing position of the juvenile oysters (the center of the kaidelite arrangement) and the square pillar 12 can be set appropriately to a range of 6cm to 9cm. The angle of the square pillar 12 is also not limited to 90 degrees, but can be set in the range of 60 to 120 degrees. The size of the juvenile oysters when they are fixed, their growth rate, sea temperature, currents, hanging depth, amount of plankton, etc. should be taken into consideration as appropriate. 。 [Industrial Applicability]

[0028] The present invention , MeThe young oysters are symmetrically attached to the curved, scrub-like depressions, which prevents predation and prevents excessive adhesion of fouling. This allows for the cultivation of rock oysters that are the original spindle shape and have grown without any irregular shapes, which makes it easier to remove fouling after landing, as well as to pack and ship them. [Explanation of symbols]

[0029] 1 S-size rock Oyster rearing equipment 11 Rectangular Sheets 11d Open area 11m center line 11u standing part 12 Prismatic 111 Cable ties 112 Cable ties 121 Washer 122 bis R Hanging rope

Claims

1. A rock oyster cultivating device formed by cutting a flexible synthetic resin mesh sheet into a rectangular shape, for fixing rock oyster juveniles to be cultivated in the sea. The rectangular sheet body is bent by closing both ends of one side of the rectangular sheet body with a binding band through a mesh hole to form a pair of upright portions, and the opposing side is opened wide, and curved recesses are formed symmetrically as open portions, The apex of the shell of a rock oyster juvenile, whose major axis is 2 cm to 5 cm, is positioned on the upright side inside the curved depression, and the juvenile oysters are also symmetrical to match the symmetry of the curved depression, and the normal direction of the lid shell is oriented perpendicular to the line of symmetry passing through the center of the rectangular sheet body. When the oysters are fixed and cultivated, as the rock oysters grow, the major axis ends of the lid shell and the shell will interfere with each other, and the outer shape of the small size rock oysters weighing 200 g to 250 g will be heart-shaped. This small-sized rock oyster cultivating tool is characterized in that it can be attached to a hanging rope hung vertically during underwater culturing by passing the symmetrical line and the hanging rope through a mesh hole at a position above the center of gravity of the rectangular sheet body to which the rock oysters are fixed at the time of harvesting and tying them together with a single binding band.

2. 2. The small-sized rock oyster cultivating device according to claim 1, wherein the prismatic body is erected by sandwiching a rectangular sheet body and fastening it with screws using the mesh holes.

3. A method for cultivating rock oysters underwater using a rock oyster cultivation tool formed from a rectangular sheet body obtained by cutting a flexible synthetic resin mesh sheet body into a rectangle, The rectangular sheet body is bent by closing both ends of one side of the rectangular sheet body with a binding band through a mesh hole to form a pair of upright portions, and the opposing sides are opened wide to form open portions, thereby forming curved depressions symmetrically on the left and right sides; The oyster juveniles, each with a major axis of 2 cm to 5 cm, are fixed to the inside of the curved depression with the apex of the shell facing the upright portion, and the juveniles are also fixed symmetrically to match the symmetry of the curved depression, with the normal direction of the lid shell oriented perpendicular to the line of symmetry passing through the center of the rectangular sheet body. Furthermore, as the rock oysters grow, the prisms are erected from the rectangular sheet so that they interfere with the long diameter ends of the lid and shell, giving the rock oysters a heart-shaped outer shape. For the hanging rope hanging vertically, the symmetrical line and the hanging rope are passed through a mesh hole at a position above the center of gravity of the rectangular sheet body to which the rock oysters are attached at the time of harvesting and bound with a single binding band. This method for cultivating small rock oysters is characterized by cultivating them in the sea until they reach 200g to 250g, which corresponds to the small size.

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