JP6903811B1 - Fish cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cage having a stable steric hindrance above the water surface and capable of protecting aquaculture products from birds. SOLUTION: It has an upper surface, a side surface portion and a bottom surface portion, the upper surface portion is an opening surface substantially coincide with the water surface, the side surface portion extends from the water surface side to the water bottom side, and the bottom surface portion is downward substantially parallel to the opening surface. The side rope and the bottom surface integrally form a cage body 30 for accommodating marine products, and the side rope 21 forming the outer edge of the opening surface of the upper surface and the side rope 21 are attached to the side rope 21 at substantially regular intervals. A plurality of first floating bodies 22, an upwardly extending first strut 28 fixed to the side rope 21 at substantially regular intervals, and fixed to the inside of the side rope 21 on the opening surface at a distance from the side rope 21. The second floating body 23, the second support column 29 attached to the second floating body 23, and the first support column 28 and the second support column 29 are connected, and one end is above the water surface of the second support column 29. A cage comprising at least one first class 25 whose other end is fixed above the water surface of the first strut 28 at the position of. [Selection diagram] Fig. 4

Description

The present invention relates to a cage provided with a mechanism for protecting aquaculture products from predation of birds and the like.

Usually, large fish such as tuna are cultivated in a large net cage provided on the sea. In aquaculture at sea, there is a problem that neighboring seabirds flock to the cage for food, especially from autumn to spring, which hinders feeding. The problem of seabirds extends not only to the predation of seabirds, but also to the predation of the fish themselves (especially fry). In addition, there is also a problem that the amount of fish feed is reduced when seabirds flock around the cage.

As a method for preventing damage to farmed fish by birds, for example, Non-Patent Document 1 describes that in rice field crucian carp farming, measures are taken to stretch a fishing line above the rice field. This is a method in which a thread-like member is tied to a stake, a tree, a pillar of a building, etc., which points vertically to the ground around the rice field, and stretched above the rice field without slack. The formation of filamentous steric hindrance above the rice field has the effect of making it difficult for fish-eating birds such as herons to approach the water surface of the rice field.

Fisheries Technology, 4 (1), 1-6 (2011)

Since the method described in Non-Patent Document 1 fixes the thread-like member to a pile or the like fixed on land, it can be relatively easily achieved to stretch the thread-like member above the water surface without slack. When tying a tegus or a rope to a large cage installed on the sea, especially a net cage, even if a stake for laying a rope is fixed to the periphery of the cage, the movement of the stake cannot be stopped like on land. It is difficult to maintain a tight state such as a rope. Therefore, even with reference to Non-Patent Document 1, it is not possible to provide an effective steric hindrance above the water surface.

The present invention provides a cage that has stable steric hindrance above the surface of the water and is capable of protecting aquaculture products or their food from birds in fish cages on water, especially large net cages on the sea. The purpose.

The present invention provides the following in order to solve the above problems.
(1) An aquaculture cage laid in water used for growing marine products inside, which has an upper surface, a side surface portion and a bottom surface portion, and the upper surface is an opening surface substantially coincide with the water surface. The side surface portion extends from the water surface side to the water bottom side, the bottom surface portion is arranged downward substantially parallel to the opening surface, and the side surface portion and the bottom surface portion integrally form a cage body for accommodating marine products. A side rope forming the outer edge of the opening surface of the upper surface, a plurality of first floating bodies attached to the side rope at substantially regular intervals, and a first strut extending upward fixed to the side rope at substantially regular intervals. A second floating body fixed to the inside of the side rope on the opening surface at a distance from the side rope, a second support column attached to the second floating body, and one end thereof. The two columns are provided with at least one first rope fixed above the water surface, and the other end of the first rope is fixed to the first support, the first floating body, or the side rope. The cage was made.
(2) The other end of the first rope is fixed above the water surface of the first strut, and the first strut connects the first strut and the second strut above the water surface. The cage of (1).
(3) The cage of (2), which is provided with a plurality of first ropes, and the second support and the plurality of first pillars are connected to each other by the first rope.
(4) The cage according to any one of (1) to (3), wherein the first support column is attached to at least a part of the first floating body.
(5) A curtain net extending substantially vertically on the water surface at a constant height is further provided above the position of the side rope, and the curtain net surrounds the space above the cage body. One of the cages (1) to (4) fixed to one support.
(6) One end of a plurality of second ropes is fixed to the second floating body, and the other end of the second rope is fixed to a plurality of places on the side rope, respectively, (1) to (1). One of the 5) cages.
(7) An aquaculture cage laid in water used for growing marine products inside, which has an upper surface, a side surface portion, and a bottom surface portion, and the upper surface is an opening surface that substantially coincides with the water surface. The side surface portion extends from the water surface side to the water bottom side, the bottom surface portion is arranged downward substantially parallel to the opening surface, and the side surface portion and the bottom surface portion integrally form a cage body for accommodating marine products. A side rope forming the outer edge of the opening surface of the upper surface, a plurality of first floating bodies attached to the side rope at substantially regular intervals, and a first strut extending upward fixed to the side rope at substantially regular intervals. A second floating body fixed to the inside of the side rope on the opening surface at a distance from the side rope, a second support column attached to the second floating body and extending upward, and one end thereof is the first. The said, with at least one first rope fixed to two stanchions, such that the first rope obstructs the flight path of a seabird flying in accordance with the feeding position or direction of the fish and shellfish. A cage in which the other end of the first class is fixed at a predetermined position other than the second support of the cage.

According to the present invention, there is provided a cage that has stable steric hindrance above the surface of the water and can protect aquaculture products or their food from birds in a cage on the water, particularly a large net cage on the sea. It is possible.

It is a top view which shows the example of the side lining for installing a plurality of cage main bodies in the float type large split net cage which is one Embodiment of the cage of this invention. It is a top view which shows the structure of one Embodiment of the cage net formed in the region A of the float type large split net cage of FIG. FIG. 2 is a cross-sectional view taken along the line BB'of the cage net of FIG. FIG. 2 is a cross-sectional view taken along the line CC'of the cage net of FIG. It is a perspective view which shows the example of the shape of the 2nd floating body and 2nd column. It is a schematic diagram which shows the role of the 2nd floating body and the 2nd support, and shows the positional relationship of each support and a rope on the water surface. (A) shows a case where the second floating body and the second strut are not provided and the bird rope is stretched using only the first strut. (B) shows a state in which the rope is loosened when the bird rope is stretched using only the first support without providing the second floating body and the second support. (C) shows a case where a bird rope is stretched between the two first columns and the second column fixed to the second floating body. It is a top view which shows the relationship between the cage of this invention and a feeding ship. It is a top view which shows the other embodiment of the bird class. Only the side rope, the second float, part of the first strut, the second strut, the bird rope and additional bird rope are shown schematically. It is a partial side view which shows the 1st aspect of the method of fixing a 1st support to a cage net. It is a partial side view which shows the 2nd aspect of the method of fixing a 1st support to a cage net.

In the present specification, "downward" refers to a direction vertically from the water surface to the bottom of the water, and "upper" refers to a direction opposite to the downward direction perpendicular to the water surface. On the other hand, the "horizontal direction" refers to a direction perpendicular to the vertical direction. In the present specification, the "top surface" and the "bottom surface" refer to the surface located at the uppermost position and the surface located at the lowermost position in one object, and the "side surface" means the upper surface and the bottom surface sandwiched between the upper surface and the bottom surface. Refers to the plane perpendicular to. The term "rectangular" as used herein does not indicate a perfect rectangle, but includes a substantially rectangular shape. Similarly, terms such as "rectangular parallelepiped", "prism", "cylinder", "hemisphere", "constant", "vertical", "match", "center", and "parallel" also indicate that they are not necessarily perfect. is not it.

<Corf>
Hereinafter, embodiments of the cage of the present invention will be exemplified, but the scope of the present invention is not limited to the following embodiments.
One embodiment of the cage of the present invention is a cage for aquaculture laid on water, which is used for growing marine products inside, and has an upper surface, a side surface portion and a bottom surface portion, and the upper surface thereof is abbreviated as a water surface. It is a matching opening surface, the side surface portion extends from the water surface side to the water bottom side, the bottom surface portion is arranged downward substantially parallel to the opening surface, and the side surface portion and the bottom surface portion integrally store marine products. A side rope that forms the main body of the cage and forms the outer edge of the opening surface of the upper surface, a plurality of first floating bodies attached to the side rope at substantially regular intervals, and an upper portion fixed to the side rope at substantially regular intervals. A first strut extending to the surface, a second floating body fixed to the inside of the side rope on the opening surface at a distance from the side rope, and a second floating body attached to the second floating body and extending upward. A strut and at least one first rope having one end fixed above the water surface of the second strut are provided, and the other end of the first rope is the first strut, the first rope. It is characterized in that it is fixed to a floating body or the side rope.

Another embodiment of the cage of the present invention is a fish cage laid in water used for growing marine products inside, which has an upper surface, a side surface portion and a bottom surface portion, and the upper surface portion is a water surface. It is an opening surface that substantially coincides, the side surface portion extends from the water surface side to the water bottom side, the bottom surface portion is arranged downward substantially parallel to the opening surface, and the side surface portion and the bottom surface portion integrally contain marine products. A side rope that forms the main body of the cage and forms the outer edge of the opening surface of the upper surface, a plurality of first floating bodies attached to the side rope at substantially regular intervals, and fixed to the side rope at substantially regular intervals. A first strut extending upward, a second floating body fixed to the inside of the side rope on the opening surface at a distance from the side rope, and a second floating body attached to the second floating body extending upward. A seabird that comprises two stanchions and at least one first rope with one end fixed to the second stanchion, the first rope flying in accordance with the feeding position or direction of the fish and shellfish. The other end of the first rope body is fixed at a predetermined position other than the second strut of the cage so as to obstruct the flight path of the fish cage.

The type, shape, material, etc. of the cage of the present invention are not particularly limited as long as it is a cage for aquaculture laid on water such as the sea. Hereinafter, it is also referred to as "middle-split net cage" and "large-split net cage"), and a float-type cage is preferable. The float type cage is a cage composed only of rope, and unlike the raft type that uses a steel pipe (iron pipe) or a polyethylene frame, it does not use a hard frame, so there is no risk of the frame bending or breaking. , Less susceptible to waves and wind. Therefore, it is possible to create and install a very large cage with a side of 20 to 80 m. FIG. 1 schematically shows an example of a lateral upholstery structure for installing a plurality of cage main bodies for a float type large split net cage, which is an embodiment of the cage of the present invention. In the float type large split net cage 10, ropes called side tensions 13 in which a large number of floats (not shown) are fixed at regular intervals are installed in the sea in a grid pattern, and are placed at the tips and sides of each side. It is formed by applying tension with a square block 11 installed on the seabed via a stretched anchor rope 12. The square block 11 is a block of concrete of 20 to 100 tons and acts as a heavy stone. By applying tension to the side tension 13 by the weight of the square mass 11, the grid-like structure formed by the side tension 13 is maintained.

A cage net is installed inside each of the grid-shaped rectangles formed by the lateral tension 13 of FIG. 1. FIG. 2 is a top view showing the structure of one embodiment of the cage body formed inside the region A of the float type large split net cage of FIG. 3 is a cross-sectional view taken along the line BB'of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line CC'of FIG. The cage net 20 has an upper surface, a side surface portion, and a bottom surface portion, and the upper surface is an opening surface arranged so as to coincide with the water surface W. A side rope 21 exists so as to surround the opening surface. The side ropes 13 and the side ropes of the cage net 20 are fixed so as to be pulled by dozens of fixed ropes 27 per side. The cage net 20 has a side rope 21, a side surface portion extending downward from the side rope 21, and a bottom surface portion arranged downward in parallel with the opening surface, and the side surface portion and the bottom surface portion are integrally formed. A cage net body 30 for accommodating marine products is formed. In the cage of the present invention, the side surface portion and the bottom surface portion do not necessarily have to be a net body, and if a marine product can be stably stored in water, for example, one side may be a flat plate without gaps, or one or both. May be fence-shaped, but it is preferable that both are composed of a net. In the illustrated example, the cage net main body 30 is formed in a rectangular parallelepiped, and the shape is maintained constant in water by attaching sinkers (weights) 34 such as sandbags at regular intervals along the side of the bottom surface portion. The side surface portion and the bottom surface portion do not necessarily have to be clearly separated like a prism or a cylinder, and may be formed in a hemispherical shape or a pyramid shape having an apex at the bottom integrally. The cage net 20 fixes the side rope 21 so as to be pulled by the side tension 13 and several tens of fixing ropes 27 per side.

First floating bodies 22 are attached to the outer circumference of the side rope 21 at regular intervals. A plurality of first columns 28 extending further upward are attached to the side rope 21. In the present invention, there may be at least two first columns 28 facing each other with the water surface W surrounded by the side ropes 21 sandwiched between them, but preferably, a large number of the first columns 28 are attached to the side ropes 21 at regular intervals as shown in the illustrated example. This is attached. More preferably, in the first support column 28 to which a large number of the lines are attached, a curtain net 32 extending vertically from the position of the side rope 21 to the water surface W at a constant height is provided in the space above the cage net 20. It is fixed so as to surround it. The curtain net 32 is useful for preventing the fish from jumping out of the cage when the marine product inside is a fish, and the height is not particularly limited, but is usually 0.5 to 2.0 m. Degree. In order to stabilize the shape of the opening of the cage net 20, a rope is attached between an arbitrary point of the side rope 21 and a point facing the water surface W surrounded by the side rope 21, and the lining 24 is provided. It may be formed. As shown in FIG. 4, the lining 24 may be stretched between the roots of the two first columns 28, or a plurality of linings 24 may be stretched in parallel with each other.

It is preferable that the muscle rope 31 is fixed to the side surface portion of the cage net main body 30 so as to extend in the vertical direction from the upper end to the lower end of the cage net main body 30. It is more preferable that a plurality of muscle ropes 31 are fixed at regular intervals in the left-right direction along the side surface of the cage net main body 30. The rope 31 makes it possible to reinforce the cage net body 30 and stabilize its shape.

In the cage of the present invention, at least one float is arranged on the water surface W surrounded by the side rope 21. In the examples of FIGS. 2 to 4, the second floating body 23 corresponds to this. The second floating body 23 is preferably fixed to the lining 24 near the water surface W (the lining 24 in this case corresponds to the "second class" of the present invention). By fixing the second floating body 23 to the lining 24, the second floating body 23 is surely fixed at a predetermined position on the water surface W surrounded by the side rope 21. More preferably, a fixing rope 26 is further stretched between the second floating body 23 and another lining 24 in the vicinity. A sinker 33 for stabilizing on water may be attached to the second floating body 23 downward. A second support column 29 extending upward from the second floating body is fixed to the second floating body 23. A bird rope 25 (corresponding to the "first rope" of the present invention) is stretched so as to connect the second support 29 and at least one (two in the illustrated example) first support 28. The bird rope 25 needs to be stably stretched above the water surface W. Preferably, it can interfere with the flight path of the bird when preying on the bait discharged from the feeding vessel while flying, that is, at a height at which a bird-proof effect is exerted, specifically 0.5 to 2 from the water surface W. Stretched to be maintained 5.5 m above, especially 1.5-2.0 m above.

In the examples of FIGS. 2 to 4, the bird rope 25 is stretched so as to connect the first support 28 and the second support 29, but the bird rope 25 exerts a bird prevention effect as described above. It suffices if it is stretched to a height, and it is not always necessary to fix the first support column 28 and the second support column 29 so as to connect them. At least one end of the bird rope 25 is fixed to the second support column 29, and the feeding position is above the water surface W, preferably 0.5 to 2.5 m above the water surface W, and more preferably 1.5 to 2. The other end may be fixed to any part of the cage as long as it is maintained 0.0 m above. For example, the bird rope 25 may connect the second strut 29 and the first floating body 22, or the bird rope 25 may connect the second strut 29 and the side rope 21 (FIG. FIG. Not shown). In these embodiments, the bird rope 25 is stretched at an angle to the water surface, but at least a part of it is maintained at a height at which the bird protection effect is exhibited.

FIG. 5 illustrates the shapes of the second floating body 23 and the second support column 29. In the example of FIG. 5A, a commercially available fishing float is used as the second floating body 23, and the second support column 29 is pierced into the second floating body 23. FIG. 5B shows a shape in which three floats are grouped together by a rope 51 to form a second floating body 23, and a second support column 29 is pierced into the second floating body 23. The shapes of the second floating body 23 and the second support column 29 are not limited thereto.

In the cage of the present invention, the second floating body 23 and the second strut 29 play an important role in order to stably stretch the bird rope 25 above the water surface W. FIG. 6 is a schematic view showing the relationship between each support and the rope on the water surface W for showing the roles of the second floating body 23 and the second support 29. When the second floating body 23 and the second strut 29 are not provided, it is assumed that the bird rope 25 is stretched between the two first strut 28 fixed at the position of the side rope 21 (FIG. 6A). However, especially in a large cage, in order to stretch the bird rope 25 while maintaining the height, it is necessary to apply a considerably strong tension, and the risk of bending or bending of the support is higher than that of the small cage. In addition, there is also a problem that the columns are easily tilted because they are easily affected by wind and waves. If the strut is tilted, broken, bent, or the like, the bird rope 25 becomes loose, and it becomes difficult to maintain the bird rope 25 at an effective height for bird prevention (FIG. 6B). In the cage of the present invention, the length of the rope to be stretched is shortened by stretching the bird rope 25 between at least two first pillars 28 and the second pillar 29 fixed to the second floating body 23. Can be done (Fig. 6C). As a result, it is possible to stably maintain the height of the bird rope 25 with a low tension that does not cause the support to tilt or break, and it is also possible to make it less susceptible to the influence of waves and wind. Is.

FIG. 7 shows a schematic top view showing the relationship between the cage and the feeding ship of the present invention. The method of feeding the cultured marine products (cultured fish, etc.) in the cage is not particularly limited, but in the case of a large cage, a method of feeding the feed from the feeding boat toward the inside of the cage is usually adopted. The feeding vessel 71 stops near the cage and, if necessary, is moored to the cage with a rope or the like so as not to move due to wind, waves, tides, or the like. The feeding vessel 71 injects food from the stop position toward the water surface in the cage, that is, the water surface surrounded by the side rope 21 in the drawing. Most of the damage caused by seabirds such as seagulls occurs when seabirds prey on food near or above the landing area 72 of the food. However, by stretching the bird rope 25 above the landing area 72 of the bait, the flight path of the seabird is obstructed, which makes it possible to reduce the predation of the bait by the seabird. When the stop position of the feeding vessel 71 is set to a predetermined position, that is, when the landing area 72 of the bait is within a substantially predetermined range, at least one is above the predetermined range as shown in the illustrated example. By arranging the bird-proof rope 25 of the book, it is possible to have a bird-proof effect. In the illustrated example, the bait landing area 72 is one, and only one bird rope 25 is arranged. However, the bait landing area 72 may be a plurality, and in that case, each water landing area 72 may be provided. It is desirable to arrange a plurality of bird ropes 25 so as to correspond to the area 72.

In the example shown in FIGS. 2 to 4, a bird rope 25 is stretched between one second strut 29 and two first strut 28, but one second strut 29 and three. A bird rope 25 may be stretched between the first support column 28 and the above. In addition, two or more second columns 29 may be arranged, and a bird rope 25 may be stretched on each of the second columns 29. Further, above the cage net 20, not only the bird rope 25 fixed to the second support column but also an additional bird rope may be stretched.

FIG. 8 shows a schematic top view of another embodiment of the bird class. FIG. 8 schematically shows only the side rope 21, the second floating body 23, a part of the first strut 28, the second strut 29, the bird rope 25, and the additional bird rope 81 of the cage. FIG. 8A shows an embodiment in which the four bird ropes 25 are fixed so as to connect the second support column 29 and the four first support columns 28, respectively. In FIG. 8B, two bird-proof ropes 25 are fixed so as to connect the second support column 29 and the two first support columns 28, respectively, and the middle of each bird-proof rope 25 and the first of each of the two bird-proof ropes 25. An embodiment in which an additional bird rope 81 is fixed so as to connect each of the columns 28 is shown. In FIG. 8C, two bird-proof ropes 25 are fixed so as to connect the second support column 29 and the two first support columns 28, respectively, and cross over the two bird-proof ropes 25. Shown is an embodiment in which three additional bird ropes 81 are fixed so as to connect two first struts 28 so as to cross each other. As described above, if at least one bird-proof rope 25 can connect the second support column 29 and the first support column 28, it is not always necessary to fix all the bird-proof ropes 25 to the second support column 29. The number and arrangement of the bird rope 25 and the additional bird rope 81 can be appropriately adjusted depending on the size of the cage to be installed, the number of flying birds, and the like.

In the cage of the present invention, the first support column 28 is required to be stably maintained vertically with respect to the water surface W. By maintaining the first support column 28 vertically, it becomes easy to maintain the position of the bird rope 25 at a height effective for bird prevention in the cage of the present invention. FIG. 9 shows a first aspect of the method of fixing the first support column 28 to the cage net main body 30. FIG. 9 is a partial side view of the cage as viewed from the outside. At least two tamaco 91 formed of a metal ring are attached to the attachment position of the first floating body 22 of the side rope 21 so as to be separated from each other in the left-right direction along the side rope 21. A rope 92 is passed through the loop of each Tamako 91, and the first floating body 22 is fixed to the side rope 21 from the outside of the cage using the rope 92. In order to prevent the tamaco 91 from rubbing against the first floating body 22, the contact portion of the rope 92 with the tamaco 91 may be covered with a rubber hose (not shown) or the like from the outside of the tamaco 91. In the illustrated example, the first floating body 22 is fixed so that the major axis direction of the first floating body 22 is along the side rope 21. At least one first support column 28 is fixed to the first floating body 22. Preferably, the first support column 28 is inserted into the first floating body 22 vertically with respect to the water surface W. Since the first floating body 22 is strongly fixed to the side rope 21 at at least two places via the tamaco 91, rotation about the long axis is unlikely to occur. Therefore, the first support column 28 fixed to the first floating body 22 is less likely to fall down and is maintained vertically with respect to the water surface W. When the curtain net 32 is used, the upper end of the curtain net 32 is fixed to the first support column 28, so that the curtain net 32 can be stably stretched high.

FIG. 10 shows a second aspect of the method of fixing the first support column 28 to the cage net main body 30. FIG. 10 is a partial side view of the cage as viewed from the outside. In the second aspect, the first support column 28 extends downward along the muscle rope 31 installed on the side surface of the cage net main body 30. The first support column 28 may be directly fixed to the muscle rope 31, but may be inserted into a tubular fixing member 101 attached to the muscle rope 31 as shown in the illustrated example. The fixing member 101 is preferably a member made of a flexible and high-strength material, such as a fire hose. The lower end of the fixing member 101 is closed so that the first support column 28 does not move further downward. By fixing the first support column 28 not only in the vicinity of the water surface W but also in the side surface portion of the cage net main body 30, the first support column 28 is more stably maintained vertically with respect to the water surface W. When the curtain net 32 is used, the upper end of the curtain net 32 is fixed to the first support column 28, so that the curtain net 32 can be stably stretched high.

In the above description, the float type large split net cage is exemplified, but the cage of the present invention is not limited to the float type large split net cage. For example, in a raft-type cage using a frame, the shape of the opening peripheral edge of the water surface W is fixed, and it is easier to attach a support column (first support column) perpendicular to the water surface W than the float type. .. It is possible to put a bird rope between a plurality of struts because the struts are less likely to fall over. However, in order to maintain the bird rope in a high tension state, it is necessary to apply a certain amount of tension, and the support may break or bend due to the strong tension even if it is a raft type cage. obtain. Therefore, the present invention is useful not only for float type large split net cages but also for other types of cages such as raft type cages.

<How to protect farmed fish products from birds>
The method of the present invention is a method of protecting aquaculture products to be cultivated from birds by using the above-mentioned cage of the present invention. Specifically, it is a cage for aquaculture laid in water, and has an upper surface, a side surface portion, and a bottom surface portion, the upper surface portion is an opening surface substantially coincide with the water surface, and the side surface portion is from the water surface side to the water bottom. Extending to the side, the bottom surface is arranged downward substantially parallel to the opening surface, and the side surface portion and the bottom surface portion integrally form a cage body for accommodating marine products, and form the outer edge of the opening surface of the upper surface. A side rope, a plurality of first floating bodies attached to the side rope at substantially regular intervals, a first support column fixed to the side rope at substantially regular intervals, and the above on the opening surface. A second floating body fixed to the inside of the side rope away from the side rope, a second support extending upwardly attached to the second floating body, and one end fixed above the water surface of the second support. Using a cage with at least one first rope and the other end of the first rope fixed to the first strut, the first floating body, or the side rope. It is a method of cultivating marine products.

In the method of the present invention, it is possible to protect aquaculture products from predation from birds such as seabirds by using the above-mentioned rope body, that is, a cage having a bird cage stretched above the opening surface of the cage. Is. The term "predation, etc." as used herein includes not only direct predation of aquaculture fishery products, but also predation of food fed to aquaculture fishery products.

The cultured marine product is not particularly limited as long as it is a marine product that is usually cultivated on water such as the sea, and may be any of fish, crustaceans, mollusks, echinoderms, shellfish, and seaweeds. In particular, fish, and fish such as tuna, yellowtail, and salmon, which are usually cultivated in large cages, are preferable.

10 ... Large split net cage 11 ... Square block 12 ... Anchor rope 13 ... Side lining 20 ... Raw cage 21 ... Side rope 22 ... 1st floating body 23 ... 2nd floating body 24 ... Lining (2nd rope body)
25 ... Bird rope (1st rope)
26, 27 ... Fixed rope 28 ... 1st prop 29 ... 2nd prop 30 ... Corf net body 31 ... Muscle rope 32 ... Curtain net 33, 34 ... Sinker 51 ... Rope 71 ... Feeding ship 72 ... Bait landing area 81 … Additional bird rope 91… Tamako 92… Rope 101… Fixing member

Claims (7)

An aquaculture cage laid in water used to grow marine products inside.
It has an upper surface, a side surface, and a bottom surface, and the upper surface is an opening surface that substantially coincides with the water surface, the side surface portion extends from the water surface side to the water bottom side, and the bottom surface portion is arranged downward substantially parallel to the opening surface. The side surface portion and the bottom surface portion integrally form a cage body for accommodating marine products.
The side rope forming the outer edge of the opening surface of the upper surface and
A plurality of first floating bodies attached to the side rope at substantially regular intervals,
The first strut extending upward, which is fixed to the side rope at substantially regular intervals,
A second floating body fixed to the inside of the side rope on the opening surface at a distance from the side rope,
A second support column attached to the second floating body and extending upward,
It comprises at least one first class body whose one end is fixed above the water surface of the second strut.
The other end of the first rope is fixed to the first strut, the first floating body or the side rope.
A cage having no cage net extending in the vertical direction in the water below the second floating body . Claim 1 in which the other end of the first rope is fixed above the water surface of the first strut, and the first strut connects the first strut and the second strut above the water surface. The cage described in. The cage according to claim 2, wherein a plurality of first ropes are provided, and the second support and the plurality of first pillars are connected to each other by the first rope. The cage according to any one of claims 1 to 3, wherein the first support is attached to at least a part of the first floating body. A curtain net extending substantially vertically on the water surface at a constant height is further provided above the position of the side rope, and the curtain net is attached to the first support column so as to surround the space above the cage body. The cage according to any one of claims 1 to 4, which is fixed. Any one of claims 1 to 5, wherein one end of a plurality of second ropes is fixed to the second floating body, and the other end of the second rope is fixed to a plurality of positions on the side rope. The cage described in item 1. An aquaculture cage laid in water used to grow marine products inside.
It has an upper surface, a side surface, and a bottom surface, and the upper surface is an opening surface that substantially coincides with the water surface, the side surface portion extends from the water surface side to the water bottom side, and the bottom surface portion is arranged downward substantially parallel to the opening surface. The side surface portion and the bottom surface portion integrally form a cage body for accommodating marine products.
The side rope forming the outer edge of the opening surface of the upper surface and
A plurality of first floating bodies attached to the side rope at substantially regular intervals,
The first strut extending upward, which is fixed to the side rope at substantially regular intervals,
A second floating body fixed to the inside of the side rope on the opening surface at a distance from the side rope,
A second support column attached to the second floating body and extending upward,
It comprises at least one first class body, one end of which is fixed to the second strut.
The other end of the first rope is in a predetermined position other than the second strut of the cage so that the first rope obstructs the flight path of the seabird flying in accordance with the feeding position or direction of the fish product. It is fixed to,
A cage having no cage net extending in the vertical direction in the water below the second floating body .

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