JPS5914737A - Artificial fish bank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an artificial fish reef, and more particularly to an artificial fish reef to which floating algae easily adhere. The purpose is to create an environment suitable for the inhabitation of abalone, sea urchin, and other seafood that prefers seaweed as food, and to promote their proliferation.

Conventional fish reefs have a good circulation of ocean currents, plenty of food such as plankton, and a space suitable for preventing external enemies and gathering fish and shellfish.The structure is generally made of concrete, steel, or FRP. It is equipped with openings and habitats that allow access to ocean currents and seafood. and ζroga,
Sea urchin.

Abalone and other fish and shellfish often prefer S algae as food, and conventional fish reefs have not necessarily been suitable habitats for these fish and shellfish. In other words, conventional fish reefs have not been designed to actively retain seaweed, and they do not have structures or dimensions that make it easy for floating algae to stick or get caught.

The i9J was created in view of the above circumstances, and its gist is an artificial reef characterized by having a rising wall surface with a large number of through holes.

There are many floating algae floating in shallow waters, and the hook catches the flowing algae in the perforated part, and has the effect of retaining the algae on the reef wall.

Therefore, compared to conventional fish reefs, it is possible to create an environment suitable for the inhabitation of fish and shellfish such as abalone and sea urchin, which prefer seaweed as food, and to promote their proliferation.

The shape of the through hole O can be freely selected from rectangular, diamond-shaped, round, etc., and its size is about 6 to 50 clL in internal diameter. 3cII
If it is below L, if it is sunk on the seabed, shellfish etc. will stick to it and block the through hole, reducing the ability to catch floating algae, and if it is more than 50 clL, it will be too large and it will be difficult to catch floating algae. The inner diameter is preferably 10 (!IL~60).

The vertical wall with perforations is made of synthetic resin (FRP) reinforced with glass fiber or fibers with a high elastic modulus, or steel rods lined with resin, assembled in a lattice shape.
If a rectangular, diamond-shaped, or hexagonal hole is provided, the ratio of the surface of the hole to the wall surface is large, and the effect of catching seaweed is excellent and suitable. It is also possible to use concrete construction, but in this case, the effect will be slightly lower due to the lower proportion of perforated surfaces compared to those assembled in a lattice pattern. Further, the wall surface may be constructed by punching a large number of through holes in a board such as an FRP board, or the wall surface may be constructed by stretching a metal net 1, a synthetic fiber mesh, etc., and the mesh may be used as the through holes.

The height of the wall is usually 2 m or less, and depending on the shape of the reef, it is necessary to attach a heavy submerged base such as concrete to the bottom end to make the wall a stable standing surface. It is preferable for the rising wall surface to rise perpendicularly to the seabed so as to have a wide contact surface with the ocean current, but depending on the structure of the reef, it may be made to have a diagonal rising surface.

This fish reef generally has an ocean current of 0.2
A rising wall with perforations is sunk in the direction of the ocean current in a shallow water area with a speed of about m/agC.

Breaking wave zone with water depth of 7-81 rL or 10-20 rL. , I
When building a building in a non-breaking wave zone, strong wave force acts on it (particularly in a wave breaking zone), so it is necessary to ensure the strength of the wall to withstand this wave force and to stabilize the condition of the building. In addition, the materials that make up fish reefs are F, which can withstand seawater for long periods of time.
Needless to say, it is necessary to use corrosion-resistant materials such as RP, synthetic resin-lined steel, and concrete.

Hereinafter, a fish reef according to an embodiment will be explained using the drawings.

The artificial reef shown in Fig. 1 has a lattice wall 3 made of unsaturated polyester resin reinforced with glass fibers and having a large number of through holes 2 installed vertically on a rectangular parallelepiped concrete submerged base 1. is made up of. The lattice wall 3 has a height of about 1.2 m and a width of about 1 m. This fish reef has a lattice wall 3 submerged in a shallow sea area vertically in the direction of the ocean current.

The sunken fish reef has the strength and stability to withstand wave force, and the water flowing along with the ocean current is caught in the through hole 2 and is held in place, and it has been observed that fish, abalone, etc., gather in high density around it. Ta.

The fish reef shown in FIG. 2 has a cubic frame 4 made of concrete with 15 squares on each side on top of a submerged base 1 made of concrete, and a lattice wall 6 with grid-like through holes 5 made of FRP on one side. It is constructed by attaching.

The fish reef shown in FIG. 3 is constructed by assembling steel bars lined with synthetic resin in a lattice pattern on the diagonally rising sides of a truncated hexagonal pyramidal frame 7 made of concrete, and forming a lattice wall with a lattice-shaped through hole 8. 9. This fish reef has an inclined lattice wall 9 and a stable truncated hexagonal pyramid shape, so it can be sunk in shallow water without installing a submerged base, and has the strength to withstand wave force 2.
It has stability.

[Brief explanation of the drawing]

The drawings show an embodiment of the artificial reef according to the present invention, and Figure 1 is a perspective view of a reef consisting of one wall, #g
FIG. 2 is a perspective view of a cube-shaped fish reef, and FIG. 6 is a side view of a truncated hexagonal pyramid-shaped fish reef. 1... Submerged base, 2... Through hole, 3...
... Lattice wall, 4 ... Cubic frame, 5 ...
...Through hole, 6...Lattice wall, 7...
Frame with truncated hexagonal pyramid, 8... Through hole, 9...
・Lattice wall.

Claims (1)

[Claims] An artificial fish reef characterized by having a rising wall surface with a large number of through holes.