Aquaculture net

Abstract

To provide an aquaculture net which prevents biting damage of an aquacultured object by fish, and prevents contacting the aquacultured object.SOLUTION: An aquaculture net 1 comprises: laver nets 8 which are arranged for a water surface or in the vicinity thereof; a biting damage preventing net 10 which has a bottom face net part 11 and side face net parts 12a, 12b, 13a, 13b, and is formed in a box shape whose upper part is open; and a frame body 2 to which the laver nets 8 and the biting damage preventing net 10 are installed. In the biting damage preventing net 10, the bottom face net part 11 is arranged below the laver nets 8, the side face net parts 12a, 12b, 13a, 13b are installed to the frame body 2 so as to surround the laver nets 8.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an aquaculture net used for cultivating algae such as laver and shellfish. [Background technology]

[0002] For example, in the case of Nori cultivation, Nori spores collected from the ocean are grown into filaments, and the filaments are then grown into conchospores, which are then attached to the mesh of a Nori net.The Nori net with the attached conchospores is then fixed in water, and after a certain period of time, the net is pulled out of the water and the grown Nori is harvested. During the growing period of the seaweed, the nets are fixed in the water, so the seaweed attached to the nets is eaten by fish, which causes damage to the seaweed. This type of damage occurs in the cultivation of algae such as seaweed and shellfish such as oysters.

[0003] In order to prevent or suppress damage caused by algae, a technology has been disclosed in which an algae retention member with cultivated algae attached is placed on or near the water surface, and a damage prevention net is placed underwater to prevent fish and other creatures from approaching the algae retention member (for example, Patent Document 1). Furthermore, a device has been disclosed that, when cultivating oysters on floating rafts on the sea, outputs a sound of a predetermined frequency generated by a recorder from an underwater speaker to prevent fish from approaching the farm where the raft is set up (for example, Patent Document 2). Furthermore, a device has been disclosed that prevents damage to seaweed nets by installing underwater speakers on buoys floating at the location of the seaweed nets and transmitting sounds such as the sounds of dolphins, sirens, and the sound of objects being hit hard into the sea (for example, Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-186809 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-357545 [Patent Document 3] Japanese Patent Application Laid-Open No. 2002-247926 Summary of the Invention [Problem to be solved by the invention]

[0005] When placing a feeding prevention net below the aquaculture holding members, the net is made of a material with a specific gravity heavier than water and is placed at a distance from the algae holding members placed on the water surface. It is also possible to attach weights, sinker cords, etc. to the feeding prevention net to prevent it from getting too close to the algae holding members. This anti-grazing net is placed underwater in a suspended state (like a wrapping cloth) with the ends of the net fixed to the ropes, buoyancy bodies, and anchor ropes supporting the algae-holding members, and the center of the net hanging down toward the bottom of the water. This anti-grazing net has no components to maintain the shape of the center, and there is no sufficient tension applied to this part, so it is prone to deformation in the water. For example, strong winds and waves or currents can cause the anti-grazing net to suddenly deform, causing it to come into contact with the cultivated seaweed or other products, resulting in damage.

[0006] Furthermore, since devices that output a specific sound into the water repeatedly output similar sounds, fish learn whether the sounds indicate danger or not, and after a certain amount of time they may begin to approach aquaculture rafts, seaweed nets, etc., which may reduce the device's effectiveness in preventing damage from predation.

[0007] Therefore, the present invention provides an aquaculture net that prevents damage to cultured objects by fishes and the like, and also prevents contact with the cultured objects. [Means for solving the problem]

[0008] The aquaculture net of the present invention comprises a box-shaped predator prevention net that is open at the top and has members that are placed on or near the water surface and for attaching the cultivated animals, a bottom net section that is placed approximately parallel to the water surface, and multiple side net sections that are placed approximately perpendicular to the net surface of the bottom net section, and a frame body in which the members for attaching the cultivated animals and the predator prevention net are installed, characterized in that the bottom net section is placed below the members for attaching the cultivated animals that are installed on the frame body, and the multiple side net sections are installed on the frame body so as to surround the members for attaching the cultivated animals.

[0009] The aquaculture net of the present invention is characterized in that weight members are fixed at predetermined positions on the bottom net portion and the multiple side net portions so that tension is generated on the net surface of the bottom net portion and the net surfaces of the multiple side net portions.

[0010] The aquaculture net according to the present invention has a frame body formed into a quadrangle when viewed from above, with a first frame side, a second frame side arranged opposite to the first frame side, a third frame side, and a fourth frame side arranged opposite to the third frame side, and is provided with a first guide rope installed along the first frame side in the vicinity of the first frame side, and a second guide rope installed along the second frame side in the vicinity of the second frame side, and the feeding damage prevention net has a plurality of support rings arranged in an arbitrary manner on the first side net part and the second side net part arranged opposite to each other among the plurality of side net parts. The support rings are fixed at intervals, and the first guide rope is inserted through the multiple support rings fixed to the first side mesh section, and the second guide rope is inserted through the multiple support rings fixed to the second side mesh section.When a moving member for moving the multiple support rings is operated, the support rings move along the first guide rope and the second guide rope toward the third frame side or the fourth frame side, and are installed on the frame body so as to open or cover the area around the member to which the cultivated organisms are attached.

[0011] The aquaculture net of the present invention is characterized in that the bottom net portion is constructed using nylon monofilament thread that prevents the adhesion of algae or shellfish other than the cultivated species, and has a mesh size of 50 to 400 mm.

[0012] The aquaculture net according to the present invention is characterized in that the mesh size of the plurality of side net portions is 50 to 400 mm. [Effects of the Invention]

[0013] The aquaculture net of the present invention has a predation prevention net that surrounds the cultivated animals and is formed in a box shape with an opening at the top, which prevents fish and other animals from approaching the cultivated animals and causing predation damage, and prevents the predation prevention net from unexpectedly coming into contact with the cultivated animals, thereby suppressing damage to the cultivated animals and increasing the harvest yield. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an explanatory diagram showing an overview of an aquaculture net according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is an explanatory diagram showing the configuration of the aquaculture net of FIG. 1 when viewed from the side. [Figure 3] FIG. 2 is an explanatory diagram showing another configuration example of the aquaculture net according to the first embodiment. [Figure 4] FIG. 2 is a development view of the feeding prevention net provided on the aquaculture net of FIG. 1. [Figure 5] FIG. 2 is an explanatory diagram showing the arrangement of sinker cords provided in the aquaculture net of FIG. 1. [Figure 6] 2 is an explanatory diagram showing the operation of opening the enclosure of the feeding damage prevention net provided on the aquaculture net of FIG. 1. FIG. [Figure 7] FIG. 10 is an exploded view of a feeding damage prevention net provided in an aquaculture net according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of an aquaculture net according to the present invention will be described with reference to FIGS.

[0016] [First embodiment] Fig. 1 is an explanatory diagram showing an overview of an aquaculture net 1 according to this embodiment. Fig. 1 shows the configuration of an aquaculture net 1, for example for cultivating seaweed, placed in water and viewed from above. Fig. 2 is an explanatory diagram showing the configuration of the aquaculture net 1 of Fig. 1 viewed from the side.

[0017] The aquaculture net 1 comprises a frame body 2 placed on the water surface, a seaweed net 8 (a member for attaching the cultivated material) supported and fixed to the frame body 2, and a feeding damage prevention net 10 fixed to the frame body 2 and arranged to surround the seaweed net 8. The frame 2 is formed, for example, using ropes, long boards, rod-shaped members, etc. of an appropriate thickness so as to have a quadrilateral shape when viewed from above. The quadrilateral frame body 2 is configured, for example, such that the long sides, frame sides 2a and 2b, are arranged opposite each other, and the short sides, frame sides 2c and 2d, are arranged opposite each other, so that it appears rectangular when viewed from above. Furthermore, the frame body 2 is connected and fixed at appropriate positions on each frame side, for example, at the corners (four corners) where the frame sides are connected to each other, to (multiple) floats connected to anchors fixed to the seabed, to (multiple) supports whose lower ends are fixed to the seabed, etc., and is fixed in a predetermined installation position so as not to be carried away by water currents (tidal currents), etc.

[0018] When placed in water, the feeding damage prevention net 10 is configured to have a rectangular box shape, with a rectangular bottom net portion 11 arranged parallel to the water surface, two side net portions 12a, 12b arranged perpendicular to (for example, joined to) the net surface of the bottom net portion 11, and two side net portions 13a, 13b. Note that the side net portions 12a, 12b are arranged opposite each other so that their respective net surfaces are parallel, and the side net portions 13a, 13b are arranged opposite each other so that their respective net surfaces are parallel. The side net portions 12a, 12b are arranged approximately perpendicular to each long side portion of the bottom net portion 11, and constitute the long side portions of the feeding damage prevention net 10. The side net portions 13a, 13b are arranged approximately perpendicular to each short side portion of the bottom net portion 11, and constitute the short side portions of the feeding damage prevention net 10. The bottom net portion 11 is not limited to a rectangular shape, and may be, for example, a square shape.

[0019] The bottom net part 11 constitutes the bottom part of the feeding damage prevention net 10, and is placed on the bottom side of the water when the feeding damage prevention net 10 is installed in water, and is placed below the seaweed net 8 to which seaweed conchospores and the like are attached. The feeding damage prevention net 10 is formed in a box shape with an opening at the top, and is fixed to the frame body 2 so that the part of the seaweed net 8 to which conchospores etc. are attached is placed inside the box shape. Specifically, the pest control net 10 is fastened and fixed to the frame body 2 using multiple pest control net fixing ropes 3 so that the side mesh portion 12a is positioned near the frame side 2a, the side mesh portion 12b is positioned near the frame side 2b, the side mesh portion 13a is positioned near the frame side 2c, and the side mesh portion 13b is positioned near the frame side 2d.

[0020] The aquaculture net 1 has, for example, a first predation prevention net fixing rope 3 joined and fixed along the upper edge portion of the side net portion 13a, and a second predation prevention net fixing rope 3 joined and fixed along the upper edge portion of the side net portion 13b. The first feeding damage prevention net fixing rope 3 is fixed so as to form the upper edge portion of the side net portion 13a. One end of the first feeding prevention net fixing rope 3 protrudes, for example, from the corner formed by the side mesh portion 13a and the side mesh portion 12a, and is fastened and fixed to the first end side of the frame side 2c (the position on the frame side 2a side). The other end of the first feeding prevention net fixing rope 3 protrudes, for example, from the corner formed by the side mesh portion 13a and the side mesh portion 12b, and is fastened and fixed to the second end side of the frame side 2c (the position on the frame side 2b side).

[0021] In addition, instead of providing a first anti-feeding net fixing rope 3 that is joined along the upper edge portion of the side mesh portion 13a, it is also possible to provide a anti-feeding net fixing rope 3 that connects the portion of the side mesh portion 13a on the frame side 2a side to the frame side 2c, and a anti-feeding net fixing rope 3 that connects the portion of the side mesh portion 13a on the frame side 2b side to the frame side 2c, and to fix the anti-feeding net 10 to the frame side 2c using these anti-feeding net fixing ropes 3.

[0022] The second feeding damage prevention net fixing rope 3 is fixed so as to form the upper edge portion of the side net portion 13b. One end of the second feeding prevention net fixing rope 3 protrudes, for example, from the corner formed by the side mesh portion 13b and the side mesh portion 12a, and is fastened and fixed to the first end side of the frame side 2d (the position on the frame side 2a side). The other end of the second feeding prevention net fixing rope 3 protrudes, for example, from the corner formed by the side mesh portion 13b and the side mesh portion 12b, and is fastened and fixed to the second end side of the frame side 2d (the position on the frame side 2b side).

[0023] In addition, instead of providing a second anti-feeding net fixing rope 3 that is joined along the upper edge portion of the side mesh portion 13b, it is also possible to provide a anti-feeding net fixing rope 3 that connects the portion of the side mesh portion 13b on the frame side 2a side to the frame side 2d, and a anti-feeding net fixing rope 3 that connects the portion of the side mesh portion 13b on the frame side 2b side to the frame side 2d, and use these anti-feeding net fixing ropes 3 to fix the anti-feeding net 10 to the frame side 2d.

[0024] In addition, the aquaculture net 1 is connected, for example, by a third predator-prevention net fixing rope 3 at the center (or near) of the upper edge of the side net portion 13a and the longitudinal center (or near) of the frame side 2c, thereby fixing the side net portion 13a to the frame side 2c. In addition, the aquaculture net 1 is connected, for example, by a fourth predator-prevention net fixing rope 3 at the center (or near) of the upper edge of the side net portion 13b and the longitudinal center (or near) of the frame side 2d, thereby fixing the side net portion 13b to the frame side 2d.

[0025] Each of the above-mentioned anti-feeding net fixing ropes 3 has a length that allows the seaweed net 8 to be positioned inside the box-shaped anti-feeding net 10 when the aquaculture net 1 is installed underwater (a length that allows the bottom mesh portion 11 to be positioned below the seaweed net 8). Each of the feeding damage prevention net fixing ropes 3 is similar to the ropes that make up the seaweed net 8 (the ropes fastened to the frame 2), for example. The feeding damage prevention net 10 is fixed to the frame body 2 by each feeding damage prevention net fixing rope 3 as described above, so that the edge portion of the upper end is positioned on or near the water surface.

[0026] The seaweed net 8 has a net portion between a pair (for example, two) of ropes to which seaweed conchospores and the like are attached. The seaweed net 8 has a length that allows, for example, one longitudinal end of the rope to be fastened to the frame side 2a and the other longitudinal end to be fastened to the frame side 2b, and the net portion is provided at a position appropriately spaced from the one end and the other end.

[0027] The aquaculture net 1 in Figure 1 etc. is provided with, for example, ten seaweed nets 8 including some not shown, but the number of seaweed nets 8 provided in the aquaculture net 1 is not limited to ten. The aquaculture net 1 can be provided with a number of seaweed nets 8 that can be placed (surrounded) at appropriate intervals inside the box-shaped interior of the feeding damage prevention net 10 fixed to the frame body 2. In addition, when the aquaculture net 1 is installed underwater, the seaweed net 8 is installed and fixed away from the side net portions 12a, 12b, 13a, 13b so that the mesh portions of the seaweed net 8 are prevented from coming into contact (preferably not coming into contact) with the side net portions 12a, 12b, 13a, 13b of the feeding damage prevention net 10 due to the influence of currents and waves, and the seaweed nets 8 are installed and fixed at a distance from each other so that the seaweed nets 8 are prevented from coming into contact (preferably not coming into contact) with each other. In addition, the seaweed net 8 is fastened and fixed to the frame sides 2a and 2b so that it is positioned at a depth that prevents it from coming into contact with the bottom net portion 11 of the feeding damage prevention net 10 (preferably does not come into contact with it). The seaweed net 8 can also be fastened and fixed to the frame sides 2c and 2d, and installed extending in the horizontal direction in FIG.

[0028] Fig. 3 is an explanatory diagram showing another example of the configuration of the aquaculture net 1 according to the first embodiment. For example, when the aquaculture net 1 is configured with a large frame body 2 that surrounds a wide area of ​​the sea surface, or when a short seaweed net 8 is used, two seaweed nets 8 may be connected and installed between frame side 2a and frame side 2b, as shown in Fig. 3. In more detail, for example, one end of the rope of the first seaweed net 8 is fastened and fixed to the frame side 2a. The other end of the rope of the first seaweed net 8 is fastened and fixed to one end of the rope of the second seaweed net 8. The other end of the rope of the second seaweed net 8 is fastened and fixed to the frame side 2b. That is, the first and second seaweed nets 8 are connected in the longitudinal direction and fixed so as to connect between the frame sides 2a and 2b. A plurality of seaweed nets 8 connected in the same manner as the first and second seaweed nets 8 may be installed along the frame sides 2a and 2b (for example, 10 rows, 20 nets in total).

[0029] FIG. 4 is a development view of the feeding damage prevention net 10 provided on the aquaculture net 1 of FIG. The feeding damage prevention net 10 of the aquaculture net 1 is designed to have, for example, a longitudinal length of 50 m, a lateral length (width direction) of 35 m, and a vertical length (depth) of 1.5 m. The side mesh sections 12a and 12b each have a length of 50m and a width of 1.5m, and are constructed using mesh material with a diameter of approximately 3mm and a mesh size of 1 shaku (303mm), resulting in 230.5 meshes over the 50m length. On the other hand, the side mesh sections 13a and 13b each have a length of 35m and a width of 1.5m, and are constructed using mesh material of the same thickness and mesh size as the side mesh sections 12a and 12b, with 160.5 meshes over the 35m length.

[0030] In addition, the bottom mesh portion 11 has, for example, a length of 50 m and a width of 1.5 m, and is configured using a mesh material having the same thread thickness and mesh size as the side mesh portions 12a, 12b and the side mesh portions 13a, 13b, so that it has 230.5 stitches over a length of 50 m. The bottom surface net portion 11 is formed by, for example, arranging and joining together four net portions 20, 21, 22, and 23 without any gaps in the longitudinal and lateral directions (width directions). The netting sections 20 to 23 can be made of, for example, a frog net made of a bundle of polyethylene fibers woven into a thread with a diameter of about 1 mm.

[0031] The mesh portions 20 to 23 have a mesh size of, for example, 5 sun (151.5 mm) and are configured to have 482 meshes over a length of 50 m. The net sections 20 to 23 are preferably constructed using nylon monofilament threads with a thickness of 16 to 20 (diameter 0.66 mm to 0.74 mm) to ensure sufficient strength and to prevent the adhesion of algae and shellfish other than the cultivated products that may be carried by the tidal current during the aquaculture period.The net sections 20 to 23 are preferably constructed using net material with a mesh size of 6 inches to 7.5 inches (182 mm to 227 mm) to prevent them from being swept away by the tidal current and to prevent fish that cause predation from passing through. The feeding damage prevention net 10 provided in the aquaculture net 1 is preferably constructed such that the bottom net portion 11, side net portions 12a, 12b, and side net portions 13a, 13b are made of, for example, nylon monofilament thread so that the mesh size of the net surface is 50 to 400 mm. In addition, the feeding prevention net 10 is not limited to one made of nylon monofilament thread, and in particular, for the side mesh portions 12a, 12b and the side mesh portions 13a, 13b, net material made of nylon filament thread or a mesh material made of a mixture of multiple types of thread may be used.

[0032] The side mesh sections 12a, 12b, side mesh sections 13a, 13b and mesh sections 20 to 23 all have strong ropes or the like that are thicker than the threads that form the mesh arranged around the edges to support the mesh sections. Each of the mesh sections 20 to 23 forms the bottom mesh section 11 by joining together ropes or the like that support each mesh section. The feeding damage prevention net 10 is formed into a box shape by joining together ropes, etc. at the edges of the bottom net portion 11, side net portions 12a, 12b, and side net portions 13a, 13b. The feeding damage prevention net fixing ropes 3 are joined to the ropes, etc. at the edges of each net portion.

[0033] The aquaculture net 1 is provided, for example, with a guide rope 4a extending along the frame side 2a near the frame side 2a, and a guide rope 4b extending along the frame side 2b near the frame side 2b. The guide ropes 4a and 4b are provided so as to connect between the frame side 2c and the frame side 2d, respectively. One end of the guide rope 4a is fixed to the portion where the frame side 2c and the frame side 2a are joined, or in the vicinity thereof, and the other end of the guide rope 4a is fixed to the portion where the frame side 2d and the frame side 2a are joined, or in the vicinity thereof. One end of the guide rope 4b is fixed to the joint between the frame side 2c and the frame side 2b or in the vicinity thereof, and the other end of the guide rope 4b is fixed to the joint between the frame side 2d and the frame side 2b or in the vicinity thereof.

[0034] The guide rope 4a is passed through multiple support rings 5, the support ring 5b arranged on the left side (frame side 2d side) in Figure 1, etc., and the support ring 5a arranged on the right side (frame side 2c side) in Figure 1, etc. The support rings 5, 5a, 5b through which the guide rope 4a is passed are fixed to the upper edge portions of the side mesh portion 12a by using support ring fixing ropes 6, respectively. Support ring 5b is fixed to a position on the frame side 2d side of side mesh portion 12a, and support ring 5a is fixed to a position on the frame side 2c side of side mesh portion 12a, and between support ring 5b and support ring 5a, multiple support rings 5 ​​are fixed to side mesh portion 12a, for example, at equal intervals.

[0035] The guide rope 4b is passed through multiple support rings 5, the support ring 5b being arranged on the left side (frame side 2d side) in Figure 1 etc., and the support ring 5a being arranged on the right side (frame side 2c side) in Figure 1 etc. The support rings 5, 5a, 5b through which the guide rope 4b is passed are fixed to the upper edge portions of the side mesh portion 12b by using support ring fixing ropes 6, respectively. Support ring 5b is fixed to a position on the frame side 2d side of side mesh portion 12b, and support ring 5a is fixed to a position on the frame side 2c side of side mesh portion 12b, and between support ring 5b and support ring 5a, multiple support rings 5 ​​are fixed to side mesh portion 12b, for example, at equal intervals. In Figure 1 etc., six support rings 5 ​​are fixed to each of the side mesh portions 12a, 12b, but the number of support rings 5 ​​is not limited to the above six, and a number of support rings 5 ​​according to the size of the side mesh portions 12a, 12b (feeding prevention net 10) are fixed to the side mesh portions 12a, 12b or the feeding prevention net 10.

[0036] A pulling rope 7 (moving member) is passed through the support rings 5, 5a, 5b through which the guide rope 4a is passed, and through the support rings 5, 5a, 5b through which the guide rope 4b is passed. The pulling rope 7 is passed through the support rings 5a, 5b, etc. along the way so as to connect the support ring 5a passed through the guide rope 4a and the support ring 5a passed through the guide rope 4b. In addition, the pulling rope 7 is installed so that one end is pulled out toward the frame side 2d from the support ring 5b through which the guide rope 4a is inserted, and the other end is pulled out toward the frame side 2d from the support ring 5b through which the guide rope 4b is inserted.

[0037] FIG. 5 is an explanatory diagram showing the arrangement of the sinker cords 30 provided on the aquaculture net 1 of FIG. The sinker cord 30 is installed at an appropriate position on the predator damage prevention net 10 so that when the net is placed in water, the mesh surface of each net section is taut and the box-shaped shape is maintained. The sinker cord 30 is a long wire-shaped weight member that contains, for example, lead or the like inside so that it sinks in water, and has a weight of, for example, 40 g per meter.

[0038] As shown in Figure 4, the sinker cord 30 is installed to connect the side mesh portion 12a and the side mesh portion 12b, with one end of the sinker cord 30 fixed to the upper edge portion of the side mesh portion 12a and the other end fixed to the upper edge portion of the side mesh portion 12b. In addition, the sinker cord 30 is formed in an approximately U-shape, and is configured to create tension in the height direction (depth direction when installed in water) for the side mesh portions 12a and 12b, and to create tension in the mesh surface of the bottom mesh portion 11 in the direction connecting the frame sides 2a and 2b. In other words, the sinker cord 30 is extended to connect the guide ropes 4a and 4b, and is arranged so that when each support ring 5, 5a, 5b fixed to the feeding damage prevention net 10 moves along the guide ropes 4a and 4b, it does not become an obstacle (resistance) to the movement or folding of the feeding damage prevention net 10.

[0039] The predator damage prevention net 10 shown in Figure 4, etc., has, for example, four sinker cords 30 installed, with the first sinker cord 30 being arranged along the boundary edge (e.g., the joint) (extending in the water depth direction) between the side mesh portion 12a and the side mesh portion 13b, along the boundary edge (e.g., the joint) (parallel to the water surface) between the side mesh portion 13b and the bottom mesh portion 11, and further along the boundary edge (e.g., the joint) (extending in the water depth direction) between the side mesh portion 12b and the side mesh portion 13b. That is, the first sinker cord 30 is installed in each of the mesh portions so as to be located along the frame side 2d on the frame side 2d side (near the frame side 2d).

[0040] The second sinker cord 30 is arranged along the boundary edge (e.g., the joint) (extending in the water depth direction) between the side mesh portion 12a and the side mesh portion 13a, along the boundary edge (e.g., the joint) (parallel to the water surface) between the side mesh portion 13a and the bottom mesh portion 11, and further along the boundary edge (e.g., the joint) (extending in the water depth direction) between the side mesh portion 12b and the side mesh portion 13a. That is, the second sinker cord 30 is installed in each of the mesh portions so as to be arranged along the frame side 2c on the frame side 2c side (near the frame side 2c).

[0041] For example, a third sinker cord 30 and a fourth sinker cord 30 are arranged at equal intervals between the first sinker cord 30 and the second sinker cord 30, and are respectively installed on the mesh surfaces of the side mesh portion 12a, the bottom mesh portion 11, and the side mesh portion 12b, so that when the predator damage prevention net 10 is installed in the water (fixed to the frame body 2), tension is generated on each mesh surface, causing the predator damage prevention net 10 to take on a box-like shape.

[0042] It should be noted that the anti-feeding net 10 illustrated here is provided with four sinker cords 30, but the number of sinker cords 30 is not limited to four. That is, depending on the size of the anti-feeding net 10, it may be provided with more than four sinker cords 30, for example, with multiple third sinker cords 30 (fourth sinker cords 30) etc. Also, if the anti-feeding net 10 is small, it is possible to configure the anti-feeding net 10 without providing the third sinker cord 30 (fourth sinker cord 30) etc.

[0043] The feeding damage prevention net 10 is configured so that the lower part of the box shape is heavier than the upper part by placing the sinker cord 30 in the lower part of the box shape, thereby stabilizing the shape of the aquaculture net 1 even when it is affected by waves, wind, etc., and preventing (suppressing) contact with the seaweed net 8 surrounded by the feeding damage prevention net 10.

[0044] FIG. 6 shows the operation of opening the enclosure of the feeding damage prevention net 10 placed underwater when, for example, a fishing boat or the like enters the water area enclosed by the aquaculture net 1. The feeding damage prevention net 10 is fixed so as to cover from below the seaweed net 8 having seaweed (conchospores) and the like attached thereto, which is installed on or near the water surface, and when the water surface is viewed from above, the side net portions 12a, 12b and side net portions 13a, 13b are arranged so as to surround the seaweed net 8 having seaweed (conchospores) and the like attached thereto. For example, when checking the growth status of seaweed during the cultivation period or when harvesting seaweed (harvesting the cultivated material), it is necessary to approach fishing boats, etc. to seaweed nets 8 that have conchospores, etc. attached, or seaweed nets 8 that have seaweed, etc. that have grown conchospores, etc. attached. The aquaculture net 1 is equipped with a pulling rope 7 for moving the underwater predator prevention net 10, for example, toward the frame side 2d, support rings 5, 5a, 5b for movably supporting the predator prevention net 10, and guide ropes 4a, 4b, etc., so that fishing boats and the like can approach the seaweed net 8 (a component to which the cultivated organisms are attached) to which seaweed and the like are attached and perform work.

[0045] When opening the enclosure of the feeding prevention net 10, first, for example, the fastening portion 3a of each feeding prevention net fixing rope 3 fixed to the frame side 2c is operated, and the fastening portion 3a is released to allow each support ring 5a etc. to move along the guide ropes 4a, 4b. Next, the two ends of the pulling rope 7 arranged on the frame side 2d side are pulled in the direction indicated by arrow A, and the support ring 5a and the like are moved toward the frame side 2d side. That is, the feeding damage prevention net 10, whose fixation on the side net portion 13a side has been released, is pulled toward the frame side 2d side. At this time, the side mesh portion 13a and the nearby bottom mesh portion 11 are sunk to a sufficient depth (into the water) by the second sinker cord 30 etc. installed on the side mesh portion 13a etc., the enclosure of the predation prevention net 10 becomes partially open, and the predation prevention net 10 moves toward the frame side 2d without coming into contact with the seaweed net 8 etc. installed between the frame side 2c and the frame side 2d.

[0046] By pulling the pulling rope 7 sufficiently toward the frame side 2d, the feeding damage prevention net 10 is placed in a generally folded state near the frame side 2d, opening up the area below and around the seaweed net 8. With the feeding damage prevention net 10 moved in this way, fishing boats or the like can be brought close to the seaweed net 8 to carry out work, etc. When the above work is completed and the feeding damage prevention net 10 is set up again to surround the seaweed net 8, etc., suitable ropes are connected and fixed to the two support rings 5a, and the ropes are pulled toward the frame side 2c, the side net portion 13a, etc. is moved to the vicinity of the frame side 2c, and for example, the first feeding damage prevention net fixing rope 3, etc. is fastened to the frame side 2c, and the feeding damage prevention net 10 is fixed with tension on each net surface (box-shaped). Alternatively, the feeding damage prevention net fixing rope 3 joined (fastened) to the upper edge portion, etc. of the side net portion 13a may be pulled toward the frame side 2c, and this feeding damage prevention net fixing rope 3 may be fastened and fixed to the frame side 2c.

[0047] The aquaculture net 1 described in this embodiment is configured so that the two ends of the pulling rope 7 are positioned on the frame side 2d side, and by pulling the pulling rope 7, the predation prevention net 10 (or side mesh portion 13a) is moved from the frame side 2c side to the frame side 2d side. The aquaculture net 1 according to this embodiment is not limited to the above configuration, and may be configured, for example, such that the two ends of the pulling rope 7 are positioned on the frame side 2c side, and the pulling rope 7 is passed through each of the support rings 5, 5a, and 5b, and is passed through so as to connect the support ring 5b through which the guide rope 4a is passed with the support ring 5b through which the guide rope 4b is passed. By pulling the two ends of the pulling rope 7 thus passed through the support rings 5, 5a, and 5b, the feeding damage prevention net 10 (or side net portion 13b) may be moved from the frame side 2d side to the frame side 2c side.

[0048] [Second embodiment] 7 is a development view of a predator damage prevention net 10a provided in an aquaculture net according to this embodiment. The aquaculture net is equipped with the frame 2, predator damage prevention net fixing ropes 3, guide ropes 4a, 4b, support rings 5, 5a, 5b, support ring fixing ropes 6, pulling ropes 7, and seaweed net 8, etc., as described in the first embodiment, and is configured generally in the same manner as the aquaculture net 1. Here, we will explain the parts that differ from the aquaculture net 1, i.e., the predator damage prevention net 10a that differs from the predator damage prevention net 10 of the aquaculture net 1. The aquaculture net is configured such that the length (size), quantity, spacing, etc. of each part of the frame body 2, anti-predator net fixing rope 3, guide ropes 4a, 4b, support rings 5, 5a, 5b, support ring fixing rope 6, pulling rope 7, seaweed net 8, sinker cord 30, etc. are set to fit the anti-predator net 10a.

[0049] The bottom net portion 51 of the feeding damage prevention net 10a is formed in a rectangular shape, similar to the bottom net portion 11 described in the first embodiment, and has a longitudinal length of 50 m and a width of 35 m. This bottom mesh portion 51 is constructed, for example, by arranging (joining) four mesh portions 40, 41, 42, and 43 in the longitudinal direction of side mesh portion 52a and side mesh portion 52b (extending them in the longitudinal direction of side mesh portions 53a and 53b, i.e., in the width direction of bottom mesh portion 51) without any gaps. The mesh portions 40, 41, 42, and 43 are made of a mesh material using, for example, nylon monofilament thread (thickness No. 20, diameter 0.74 mm). The mesh portions 40, 41, 42, and 43 have a mesh size (length of one mesh) of, for example, 6 sun (182 mm), and are configured to have 270 meshes over a length (width direction of the bottom mesh portion 51) of 35 m.

[0050] The side mesh portions 52a and 52b are configured, for example, using a mesh material with a diameter of about 3 mm and a mesh size of 9 sun (272.7 mm) so that there are 256.5 meshes in a length of 50 m. The side net sections 53a and 53b are constructed using a net material of the same thickness and mesh size as the side net sections 52a and 52b, with 179.5 meshes over a length of 35 m. The bottom mesh portion 51 and the side mesh portions 52a, 52b, 53a, and 53b are preferably made of a mesh material using, for example, nylon monofilament threads.

[0051] The sizes of the mesh sections constituting the feeding damage prevention net 10a are merely examples, and the mesh sections 40, 41, 42, and 43 may be made of a mesh material using polyethylene yarn as described in the first embodiment. In addition, the side mesh sections 52a and 52b and the side mesh sections 53a and 53b may also be made of a mesh material using polyethylene yarn. The net sections 40, 41, 42, 43 are preferably constructed using nylon monofilament thread with a thickness of 16 to 20 (diameter 0.66 mm to 0.74 mm) to have sufficient strength and to prevent the adhesion of algae and shellfish other than the cultivated species that are carried by the current during the aquaculture period, and using net material with a mesh size of 6 inches to 7.5 inches (182 mm to 227 mm) to prevent them from being swept away by the current and to prevent fish that cause prey damage from passing through.

[0052] The feeding damage prevention net 10a is preferably constructed such that the bottom net portion 51, side net portions 52a, 52b, and side net portions 53a, 53b are made of, for example, nylon monofilament threads and have a mesh size of 50 to 400 mm. In addition, the feeding prevention net 10 is not limited to one made of nylon monofilament thread, and in particular, for the side mesh portions 12a, 12b and the side mesh portions 13a, 13b, net material made of nylon filament thread or a mesh material made of a mixture of multiple types of thread may be used. The feeding damage prevention net 10a configured as described above can obtain the same effects as the feeding damage prevention net 10 (or the aquaculture net 1).

[0053] The aquaculture net 1 described in the first embodiment and the aquaculture net described in the second embodiment are both configured to cover the seaweed net 8 to which seaweed is attached with predation prevention nets 10, 10a to prevent damage by fish, but by appropriately adjusting the length of each net section etc. that makes up the aquaculture net 1, it can also be configured to cover components that attach or hold shellfish such as oysters, for example, to prevent damage to the farmed shellfish.

[0054] Table 1 shows the configurations of the examples of the aquaculture net of the present disclosure and the conventional aquaculture net (comparative example), as well as the effects of each aquaculture net.

[0055] [Table 1]

[0056] The aquaculture nets used in Examples 1 and 2 shown in Table 1 are both equipped with box-shaped predation prevention nets similar to the predation prevention net 10 or predation prevention net 10a of the aquaculture net 1, and surround the aquaculture target.Example 1 uses a net material made of polyethylene thread, while Example 2 uses a net material made of nylon monofilament thread. The aquaculture net used in the comparative example is a net made of nylon monofilament thread, with the central part of one piece of netting hanging down toward the bottom of the water so that the anti-feeding net surrounding the cultivated animals has a furoshiki-like shape.

[0057] When comparing the box-shaped aquaculture nets (Examples 1 and 2) with the furoshiki-shaped aquaculture net (Comparative Example), the box-shaped aquaculture net has a better underwater net shape (stability when installed underwater) than the furoshiki-shaped aquaculture net, and its net shape is more stable underwater. This prevents the net from colliding with or coming into contact with the aquaculture target (the member to which the aquaculture target is attached) surrounded by the net, and also prevents damage to the aquaculture target by fish and the like, thereby increasing the harvest yield. In addition, by preventing collisions and contact between nets, the load on the netting is distributed, thereby extending the service life of the aquaculture net.

[0058] Next, comparing the box-type aquaculture nets of Examples 1 and 2, the net using nylon monofilament thread is stronger than the net using polyethylene thread, and can prevent algae, shellfish, and other things other than the aquaculture target that have been carried by tidal currents, etc., from adhering to the net. In other words, compared to nets using polyethylene thread, the net using nylon monofilament thread can prevent the net from colliding with or coming into contact with the aquaculture target that is surrounded by the net, making it possible to increase the harvest yield.

[0059] Furthermore, the mesh size of the aquaculture net of Example 2 is larger than that of the aquaculture net of Example 1, allowing for good tidal flow, resulting in good growth of the aquaculture target organisms surrounded by the aquaculture net of Example 2. Furthermore, because the aquaculture net of Example 2 has a large mesh size, it is less likely to be swept away by tidal currents and can be made lighter.

[0060] In the aquaculture nets of Examples 1 and 2, the enclosure of the member to which the cultured material is attached can be opened by releasing the fastening of any of the feeding damage prevention nets surrounding the member to which the cultured material is attached. This prevents the feeding damage prevention net from becoming entangled around the screw propeller of a fishing boat or the like, allowing the fishing boat or the like to approach the member to which the cultured material is attached, thereby improving work efficiency. [Explanation of symbols]

[0061] 1 Aquaculture net 2 frame 2a,2b,2c,2d Frame side 3. Rope for fixing the net to prevent predation 3a Fastening part 4a, 4b Guide rope 5, 5a, 5b Support ring 6 Support ring fixing rope 7 Pull Rope 8 Seaweed net 10,10a Netting to prevent pest damage 11,51 Bottom mesh section 12a,12b,52a,52b Side mesh part 13a,13b,53a,53b Side mesh part 20,21,22,23 Amibe 30 sinker code 40,41,42,43 Amibe

Claims

1. a member placed on or near the water surface to which the cultured material adheres; a bottom net portion disposed approximately parallel to the water surface, and a plurality of side net portions disposed approximately perpendicular to the net surface of the bottom net portion, and a predator damage prevention net formed in a box shape with an open top; a frame body for installing the member to which the cultivated organisms are attached and the feeding damage prevention net; Equipped with The feeding damage prevention net is The bottom net section is disposed below the member for attaching the culture target which is installed on the frame body, and the plurality of side net sections are installed on the frame body so as to surround the member for attaching the culture target. An aquaculture net characterized by:

2. Weight members are fixed to predetermined positions of the bottom net portion and the plurality of side net portions so that tension is generated on the mesh surfaces of the bottom net portion and the plurality of side net portions.

2. The aquaculture net according to claim 1 .

3. The frame body is the frame has a first frame side, a second frame side arranged opposite the first frame side, a third frame side, and a fourth frame side arranged opposite the third frame side, and is formed into a quadrangle when viewed from above; a first guide rope installed along the first frame side and in the vicinity of the first frame side; a second guide rope installed along the second frame side and in the vicinity of the second frame side; Equipped with The feeding damage prevention net is A plurality of support rings are fixed at given intervals to each of the first and second side net portions, which are arranged opposite each other, among the plurality of side net portions; the first guide rope is passed through the plurality of support rings fixed to the first side mesh portion, The second guide rope is inserted through the plurality of support rings fixed to the second side mesh portion, When the moving member for moving the plurality of support rings is operated, the moving member moves along the first guide rope and the second guide rope toward the third frame side or the fourth frame side, and is installed on the frame body so as to open or cover the periphery of the member for attaching the culture target.

3. An aquaculture net according to claim 2.

4. The bottom net is made of nylon monofilament thread that prevents the adhesion of algae or shellfish other than the cultivated plants, and is configured to have a mesh size of 50 to 400 mm. An aquaculture net according to any one of claims 1 to 3.

5. The mesh size of the plurality of side mesh portions is 50 to 400 mm. An aquaculture net according to any one of claims 1 to 3.

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