JP2016086651A - Juvenile fish protection reef - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a juvenile fish protection reef capable of protecting a juvenile fish living in water from being preyed on by a bird, providing a habitat environment comfortable for the juvenile fish, and easily and properly performing various works such as installation, collection, and replacement of artificial seaweed.SOLUTION: The juvenile fish protection reef is provided with: a post 2 that is fixed to stand on a water bottom B; an artificial seaweed assembly 3 that has a plurality of artificial seaweed pieces 5 dangling in water W and are installed to be attached around the post; and a flange member 4 that is attached around the post so as to be positioned higher than an installation position of the artificial seaweed assembly and obstructs a part lower than an attachment position thereof from a water surface S side, which is above the attachment position.SELECTED DRAWING: Figure 8

Description

  The present invention can protect juvenile fish inhabiting underwater from bird predation, and can provide a comfortable habitat for the juvenile fish. It is related to the protection reef of juvenile fish which can perform various operations such as easily and appropriately.

  Patent Document 1 is known as a technique for providing a comfortable habitat for young fish in the sea, lake, pond, river, and the like. Patent Document 1 “Fish reefs for bottom bream fish” can be protected from natural enemy fish (scorpion fish) by releasing pheasant larvae, which are represented by bottom bream fish, into shelter-type reefs. By releasing juvenile pheasants into sheltered reefs, they can be safely dispersed while protecting them from natural enemies. For the purpose of obtaining an optimal fish reef for use in such a case, the two left and right frame bodies can be opened and closed freely at the top of the bottom-shaped side trapezoidal cylinder with the bottom and top open. Attach to. At the back of both frames, a fish body that allows larvae (pheasant groupfish) to pass through and a net that cannot pass natural enemy fish (scorpionfish) is attached. Attach the bottom plate to the bottom of the cylinder. This fish reef has a structure in which the bottom of the cylindrical body is installed so as to be substantially in contact with the sea bottom, and artificial seaweed is attached to the inside and outside of the fish reef.

Japanese Patent Laid-Open No. 7-184509

  In the fish reef of the background art, artificial seaweed is attached inside and outside, and a net body through which juvenile fish can pass without providing artificial seaweed is provided at the top of the cylinder. For this reason, the shadow of artificial seaweed is hardly formed around the top of the cylinder, and there are few hiding places where young fish can hide themselves. In addition, juvenile fish can only enter and leave the net at the top of the cylinder with few hiding places. For these reasons, there is a problem that when the juvenile fish swim around the top of the cylinder, that is, near the sea surface, birds tend to prey.

  In addition, since the cylinder is open only at the top and closed at the sides and bottom, sea water and the like are accumulated inside it, and when replacing a fish reef, it is heavy and difficult to lift. It was.

  If the form of attachment of artificial seaweed to the fish reef is individual, the more the number of artificial seaweed is increased, the more time is required to replace the artificial seaweed. If the number of artificial seaweeds is reduced, the space between the artificial seaweeds tends to be widened, and it becomes difficult to secure a sufficient place to hide young fish.

  When installing a fish reef, it is necessary to fix the bottom of the cylinder to the seabed. When there is an obstacle on the sea floor, the obstacle must be removed from the area where the bottom of the cylindrical body is fixed and its surroundings, which takes time for installation work. In addition, if the fish reef cannot be installed on a flat seabed, artificial seaweed will be offset, and the hiding place for the juvenile fish will not be evenly secured around the cylinder, but will be narrowed.

  The present invention was devised in view of the above-described conventional problems, and can protect a juvenile fish inhabiting underwater from bird predation and provide a comfortable habitat for the juvenile fish. It is also possible to provide a protective reef for juvenile fish that is possible and can easily and appropriately perform various operations such as installation, recovery, and replacement of artificial seaweed.

  A protective reef for juvenile fish according to the present invention has a post fixed to the bottom of the water, a number of artificial seaweed pieces hanging underwater, and an artificial seaweed assembly installed around the post, Attached to the periphery of the post above the position where the artificial seaweed assembly is installed, and is provided with a gutter member that shields the lower side than the installation position from the water surface side above the installation position. To do.

  The artificial seaweed assembly has a winding member having a length that is wound around and attached to the periphery of the post, and a number of the artificial seaweed pieces are laid out on the winding member and joined to the winding member. It is attached.

  A number of the artificial seaweed pieces are attached to the winding member within an attachment range that exceeds the circumference of the post.

  When the artificial seaweed assembly is provided on the post in a plurality of stages along the height direction, the artificial seaweed assemblies adjacent to each other in the height direction are provided so as to partially overlap each other. To do.

  In the protection reef for juvenile fish according to the present invention, it is possible to protect the juvenile fish that live in the water from bird predation, and to provide a comfortable habitat for the juvenile fish, and to install and collect them. Various operations such as replacement of artificial seaweed can be easily and appropriately performed.

It is a side view which shows suitable one Embodiment of the protection reef of the juvenile fish based on this invention. It is the figure which looked down at the protection reef of the juvenile fish shown in FIG. 1 from the top. It is a figure which shows a mode that the artificial seaweed assembly with which the protection reef of the juvenile fish shown in FIG. 1 was equipped was expand | deployed planarly. It is explanatory drawing explaining the joining state of the artificial seaweed piece and winding member of the artificial seaweed assembly shown in FIG. It is a schematic explanatory drawing explaining the state which attached the winding member of the artificial seaweed assembly shown in FIG. 3 to the post. It is explanatory drawing explaining the state which attached the artificial seaweed assembly shown in FIG. 3 to the post. It is explanatory drawing explaining the operation state which installs the protection reef of the juvenile fish shown in FIG. It is a side view which shows the state which installed the protection reef of the juvenile fish shown in FIG. 1 in the water bottom. It is a perspective view of the protection reef of the juvenile fish installed in the water bottom shown in FIG. It is a side view at the time of attaching the artificial seaweed assembly to the post of the protection reef of the juvenile fish shown in FIG.

  Hereinafter, preferred embodiments of a protective reef for juvenile fish according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view of a juvenile fish protection reef according to the present embodiment, FIG. 2 is a view of the juvenile fish protection reef shown in FIG. 1 as viewed from above, and FIG. 3 is a juvenile fish protection reef shown in FIG. FIG. 4 is a diagram illustrating a state in which the artificial seaweed assembly provided in FIG. 3 is developed in a plan view, FIG. 4 is an explanatory diagram for explaining a joining state of the artificial seaweed piece and the winding member of the artificial seaweed assembly illustrated in FIG. FIG. 6 is an explanatory diagram for explaining a state in which the wound member of the artificial seaweed assembly shown in FIG. 3 is attached to the post, and FIG. 6 is an explanatory diagram for explaining a state in which the artificial seaweed assembly shown in FIG. 3 is attached to the post. FIG. 7 is an explanatory diagram for explaining a state in which the protective reef for juvenile fish shown in FIG. 1 is installed on the bottom of the water. FIG. 8 is a side view showing a state in which the protective reef for juvenile fish shown in FIG. 9 is a perspective view of a protective reef for juvenile fish installed at the bottom of the water shown in FIG. 8, and FIG. It is a side view of a case where the artificial seaweed assembly mounted in upper and lower stages in the infant fish protection reef posts shown in.

  As shown in FIG. 1 and FIG. 2, the protective reef 1 for juvenile fish according to the present embodiment is a straight pile-shaped or rod-shaped post 2 having a vertical length, and artificial seaweed installed on the post 2. It is comprised from the assembly 3 and the eaves member 4 which is located above the installation position of the artificial seaweed assembly 3 and is attached to the post 2. The juvenile fish protection reef 1 is installed at a place where juvenile fishes such as the sea, lakes, ponds and rivers inhabit natural or aquaculture. All members constituting the protective reef 1 for juvenile fish are made of a corrosion-resistant material.

  The post 2 is made of FRP or metal and is formed in a hollow cylindrical shape having openings at upper and lower ends. The post 2 is fixed by being embedded in the bottom B (including the seabed, the same applies below) on the lower end 2a side, and is erected from the bottom B toward the underwater W (including the sea, the same applies below) (FIGS. 8 and 10). reference).

  The vertical length of the post 2 is such that the upper end 2b side is exposed upward from the water surface S (including the sea surface, the same applies hereinafter) with the lower end 2a side embedded and fixed in the bottom B, or the upper end 2b side is The length reaches the vicinity of the water surface S.

  The artificial seaweed assembly 3 has a large number of artificial seaweed pieces 5 and is installed around the post 2. Each artificial seaweed piece 5 is made of a synthetic resin such as polypropylene or polyester, and is formed of a soft string-like or strip-like long member that can be flexibly deformed. The material characteristics such as the specific gravity of the artificial seaweed piece 5 hang down in the water W, and such a material may be selected through experiments and the like.

  Specifically, as shown in FIGS. 3 and 4, the artificial seaweed assembly 3 includes a large number of artificial seaweed pieces 5 and a winding member 6. The winding member 6 is a flexible member that is flexible and deformable, made of synthetic resin such as nylon, and is formed by a belt-like or belt-like long member that can be wound around and attached to the periphery of the post 2. The length dimension of the winding member 6 is at least a length that is wound around the post 2 and attached.

  In the illustrated example, the winding member 6 includes a flat tubular tube 6a and a binding band 6b inserted through the tube 6a. The tube 6a and the binding band 6b are formed of a synthetic resin material. The winding member 6 may be a single binding band 6b. The binding band 6b has a buckle portion 6c having an engaging claw protruding at one end in the length direction, and a protrusion hooked on the engaging claw is the length of the binding band 6b on the other end 6d in the length direction. A large number are arranged along the direction, and when the other end 6d side is inserted into the buckle portion 6c and tightened, one of the protrusions is engaged with the engaging claw and the tightened state is maintained.

  As a matter of course, the winding member 6 is not limited to tightening using the binding band 6b, but may be any attachment method that can hold the wound state, such as binding a belt-like or belt-like long member. Also good.

  As shown in FIG. 3, the artificial seaweed pieces 5 are attached to the winding member 6 so that the artificial seaweed pieces 5 are aligned so that both ends of the artificial seaweed pieces 5 are approximately aligned in the length direction. On the other hand, the winding member 6 is directed in a direction in which the length direction intersects with the length direction of the artificial seaweed pieces 5 (for example, a direction orthogonal to each other), and in this state, the two are joined. Is done. In other words, a large number of artificial seaweed pieces 5 are arranged in a direction intersecting with the winding member 6 on the long winding member 6, and the artificial seaweed pieces 5 are joined and attached to the winding member 6 in this state. .

  The winding member 6 and the artificial seaweed piece 5 are joined by adhesion or fusion. FIG. 4 shows a joined state between the artificial seaweed piece 5 and the winding member 6. As shown in FIG. 4 (A), the winding member 6 may be placed on and joined to the artificial seaweed pieces 5 laid out side by side, or the midway portion in the length direction of the artificial seaweed pieces 5 is divided and wound. You may make it join the edge part of the divided artificial seaweed piece 5 to the both sides of 6 width direction.

  In the illustrated example, the joining position of the artificial seaweed piece 5 to the winding member 6 is approximately the center in the length direction of the artificial seaweed piece 5. May be brought close to the end of the artificial seaweed piece 5. If the winding member 6 is joined to the center of the artificial seaweed piece 5, as shown in FIG. 6, the artificial seaweed piece 5 is short by folding around the winding member 6, and the overlap between the artificial seaweed pieces 5 is dense. It becomes. If the winding member 6 is joined to the end of the artificial seaweed piece 5, although not shown, the artificial seaweed piece 5 is long and has a form in which the artificial seaweed pieces 5 overlap little.

  As shown in FIG. 5, the artificial seaweed assembly 3 is provided on the protective reef 1 for juvenile fish by attaching the winding member 6 so as to be detachable around the post 2. Many artificial seaweed pieces 5 are preferably attached to the winding member 6 in an attachment range R exceeding the circumference of the post 2 (see FIG. 3).

  By configuring in this way, the artificial seaweed piece 5 is installed around the post 2 without a gap. That is, the length dimension of the winding member 6 and the laying dimension R of the artificial seaweed pieces 5 with respect to the winding member 6 may be set so as to exceed the peripheral length of the post 2.

  When the artificial seaweed assembly 3 having the configuration shown in FIG. 3 is installed on the post 2, the artificial seaweed piece 5 is folded back by the winding member 6 wound around the post 2 as shown in FIG. The artificial seaweed piece 5 that hangs down from one of the two sides is taken as the inside, and the artificial seaweed piece 5 that hangs down from the other in the width direction hangs down so as to overlap the outside of the artificial seaweed piece 5 inside. Thereby, the swimming path P covered with the outer artificial seaweed piece 5 is formed between the inner artificial seaweed piece 5 </ b> A and the outer artificial seaweed piece 5 </ b> B using the folding by the winding member 6.

  The artificial seaweed pieces 5 installed on the post 2 are installed at any height position in the underwater W including a height position that can contact the water bottom B.

  The eaves member 4 is made of FRP or metal and is provided integrally with the post 2. The eaves member 4 and the post 2 may be integrally formed, or may be separately produced and joined together with an adhesive or the like. The eaves member 4 is attached to the periphery of the post 2 so as to be positioned above the installation position of the artificial seaweed assembly 3, and the lower side than the installation position is shielded from the water surface S side above the installation position. .

  In the illustrated example, the eaves member 4 has a disk shape, but may not be a disk shape or a circle as long as the upper side of the attachment position to the post 2 is blocked from the water surface S side.

  The dredging member 4 has a function of blocking the artificial seaweed assembly 3 installed below it from the water surface S with a spread. That is, the artificial seaweed assembly 3 is provided directly below the dredging member 4. In the illustrated example, the trough member 4 is provided directly above the artificial seaweed assembly 3 and on the upper end 2 b side of the post 2. A protrusion 7 having an appropriate length is formed between the flange member 4 and the upper end 2c of the post 2 so as to protrude upward from the flange member 4.

  The protrusion 7 serves as a mark indicating the position of the protective reef 1 for juvenile fish, and at the same time, is used as a grip portion when the protective reef 1 is collected for maintenance or the like. Of course, as long as it has the effect | action which shields the lower part from the attachment position from the water surface S side above an attachment position, it may be provided in the upper end 2c of the post | mailbox 2.

  The dimensional relationship between the dredging member 4 and the artificial seaweed piece 5 of the artificial seaweed assembly 3 is designed so that the dredging member 4 has a disk shape with an outer diameter D as shown in FIG. When the artificial seaweed piece 5 flatly developed in a circular shape at a flat place has the outer diameter dimension d, the outer diameter dimension D of the dredging member 4 covers the artificial seaweed piece 5 below the installation position from above. , D / 2 ≦ D <d is set with respect to the outer diameter d of the artificial seaweed piece 5 so that the sunlight or the like reaches the outer edge side of the artificial seaweed piece 5.

  Next, the effect | action of the protection reef 1 of the juvenile fish which concerns on this embodiment is demonstrated. First, production of the protective reef 1 for juvenile fish will be described. For example, the post 2 with the trough member 4 is integrally formed. On the other hand, the artificial seaweed piece 5 is joined and attached to the winding member 6 to produce the artificial seaweed assembly 3. And the artificial seaweed piece 5 is provided under the dredging member 4 by winding the winding member 6 around the post 2.

  Next, installation on the bottom B will be described with reference to FIGS. The protective reef 1 for juvenile fish is brought into the field, and the lower end 2d of the post 2 is placed on the bottom B. Next, the hose 9 connected to the discharge port of the pump 8 that discharges compressed air is inserted from the upper end 2 c of the post 2, and the compressed air is supplied to the inner space of the post 2 while pressing the post 2 against the water bottom B.

  Mud, sand, and gravel are pushed out together with water from the periphery of the lower end 2a side of the post 2 by the compressed air, whereby the lower end 2a side of the post 2 pressed against the bottom B is buried in the bottom B. The post 2 is erected on the underwater W. In the standing post 2, the eaves member 4 is positioned below the water surface S and the upper protrusion 7 is exposed upward from the water surface S, or the protrusion 7 (the upper end 2 c of the post 2) is the water surface S. Located nearby.

  On the other hand, when recovering the protective reef 1 for juvenile fish, the protruding portion 7 or the trough member 4 is grasped and pulled out. Thereby, the lower end 2a side of the post 2 is pulled out from the bottom B, and the protective reef 1 is pulled up from the water W.

  In the protective reef 1 for juvenile fish according to the present embodiment described above, a large number of artificial seaweed pieces 5 that hang down in the water W are provided around the post 2 fixed to the bottom B. Can create an environment. Since the eaves member 4 is installed around the post 2 above the installation position of the artificial seaweed assembly 3 and shields the lower side of the installation position from the water surface S side above the installation position. Thus, it is possible to surely create a shadow that the young fish hides, and to prevent the young fish swimming around the artificial seaweed piece 5 under the cage member 4 from being preyed by birds or the like.

  The protective reef 1 for juvenile fish according to the present embodiment is mainly composed of a hollow cylindrical post 2 having openings at upper and lower ends, and grips the protruding portion 7 and the trough member 4 when exchanging and collecting. If it is pulled out, water and the like inside the post 2 are drained, so that it is lightweight during work and can be easily lifted.

  Since the artificial seaweed assembly 3 having the artificial seaweed pieces 5 is configured, the artificial seaweed pieces 5 can be installed on the posts 2 by attaching the artificial seaweed assemblies 3 to the posts 2. Compared with attaching the book to the post 2 individually, the artificial seaweed piece 5 can be provided very simply. Therefore, a large number of artificial seaweed pieces 5 can be attached without any trouble, and the large number of artificial seaweed pieces 5 can sufficiently secure a hiding place for juvenile fish.

  Since it is a protective reef 1 for juvenile fish mainly composed of posts 2 such as piles, even if there are obstacles in the bottom B, it can be installed easily and reliably by pushing them away. Is simple and has a pile shape, so that even if the bottom B is not flat, it can be installed upright so that it does not tilt. In addition, the hiding place for the juvenile fish can be sufficiently secured with an even spread around the post 2.

  As described above, the protective reef 1 for juvenile fish according to the present embodiment can protect the juvenile fish that live in the water from bird predation and can provide a comfortable habitat for the juvenile fish. And various operations such as recovery and replacement of the artificial seaweed pieces 5 can be performed easily and appropriately.

  The artificial seaweed assembly 3 has a winding member 6 having a length to be wound around and attached to the periphery of the post 2, and a large number of artificial seaweed pieces 5 are laid on the winding member 6 and joined to the winding member 6. Therefore, a large number of artificial seaweed pieces 5 can be efficiently provided on the protective reef 1 for juvenile fish simply by winding the winding member 6 around the post 2 and attaching it.

  Since the artificial seaweed pieces 5 are laid out and joined and attached to the winding member 6, no matter how many artificial seaweed pieces 5 are arranged, the artificial seaweed pieces 5 can be attached to the winding member 6 all at once by laying down.

  The wrapping member 6 can be attached to any position between the lengthwise ends of the artificial seaweed piece 5, and when the artificial seaweed piece 5 is attached to the center of the artificial seaweed piece 5, By folding and double, the hiding place of the juvenile fish can be doubled, and at the same time, the double gap can be used as the swimming passage P for juvenile fish. On the other hand, when attached to the end of the artificial seaweed piece 5, the artificial seaweed pieces 5 are less overlapped and widened, and relatively large juvenile fish can be made to swim easily.

  By making the winding member 6 made of a synthetic resin, if the winding member 6 wound around the post 2 is cut with a cutting tool such as a cutter, the old artificial seaweed assembly 3 can be removed very easily at once, It can be replaced with a new artificial seaweed assembly 3 smoothly.

  A large number of artificial seaweed pieces 5 are attached to the wrapping member 6 in the attachment range R exceeding the circumference of the post 2, so that it is possible to prevent gaps in the artificial seaweed pieces 5 around the post 2, depending on birds, etc. Predation of juvenile fish can be prevented appropriately.

  The dredging member 4 has a disk shape with an outer diameter D, and the artificial seaweed assembly 3 has an outer diameter d of an artificial seaweed piece 5 flatly developed in a circular shape, and the outer diameter of the dredging member 4 D is set to 1 / 2d ≦ D <d with respect to the outer diameter d of the artificial seaweed piece 5, so that the sun can reach the outer edge of the artificial seaweed piece 5 while preventing predation by birds and the like. And can create a habitat suitable for young fish.

  In the above embodiment, the case where the single artificial seaweed assembly 3 is provided on the post 2 has been described. However, as shown in FIG. 10, the artificial seaweed assembly 3 is disposed on the post 2 in the height direction. A plurality of stages may be provided along two or more stages.

  In this case, the artificial seaweed assemblies 3 adjacent in the height direction are provided so as to partially overlap each other. Specifically, the lower end of the artificial seaweed piece 5 of the upper artificial seaweed assembly 3A (the lower end position is indicated by F in the figure) is the upper end of the artificial seaweed piece 5 of the lower artificial seaweed assembly 3B (in the figure, The upper end position is indicated by G). In this way, when the artificial seaweed assembly 3 is provided in multiple stages and it is desired to ensure a wide habitat environment for the juvenile fish, the artificial seaweed pieces 5 are disposed without gaps in the height direction of the post 2, and the juvenile fish protection reef 1 It is possible to properly protect the juvenile fish that have entered the pond.

1 Protective reefs for juvenile fish 2 Post 3 Artificial seaweed assembly 4 Dredging member 5 Artificial seaweed piece 6 Wrapping member B Water bottom D Outside diameter size of dredging member d Outside diameter size of artificial seaweed piece flattened in a circular shape R Artificial seaweed Installation range of piece S Water surface W Underwater

Claims (4)

A post fixed to the bottom of the water,
An artificial seaweed assembly having a large number of artificial seaweed pieces hanging down in the water and installed around the post;
Attached to the periphery of the post above the position where the artificial seaweed assembly is installed, and is provided with a gutter member that shields the lower side than the installation position from the water surface side above the installation position. A protective reef for young fish.   The artificial seaweed assembly has a winding member having a length that is wound around and attached to the periphery of the post, and a number of the artificial seaweed pieces are laid out on the winding member and joined to the winding member. The protective reef for juvenile fish according to claim 1, which is attached.   The juvenile fish protection reef according to claim 2, wherein a large number of the artificial seaweed pieces are attached to the winding member within an attachment range exceeding a circumference of the post.   When the artificial seaweed assembly is provided on the post in a plurality of stages along the height direction, the artificial seaweed assemblies adjacent to each other in the height direction are provided so as to partially overlap each other. The protective reef for juvenile fish according to any one of claims 1 to 3.

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