JPH029773B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fish reef block used to create a spawning ground for squid, sea bream, other fin fish, etc.

It is generally known that squid spawn in large numbers on the underside of boulders on the ocean floor, and on the ceilings of rock ledges and rock crevices. In particular, the opening height is 20 to 50 cm in areas with a large amount of spawning.
This is the ceiling surface of a relatively narrow space. In addition, it is important that the environment is clear and has good tidal flow. However, there are few natural reef zones that have these conditions and are suitable for spawning squid.

Against this background, the present invention provides a fish reef block that is suitable for creating a spawning ground for squid and the like and has good stability when installed on the seabed.
That is, in the present invention, a through hole having a size corresponding to 10 to 30% of the area of the flat top plate is provided in the center of the flat top plate, and a hole is provided in the center of the flat top plate on the lower side of the flat top plate. The plate-like legs are provided to extend radially around the flat top plate, and further, the lower parts of the adjacent plate-like legs are connected to each other along the periphery of the flat top plate by a connecting member. It is a fish reef block that is characterized by the fact that it is shaped like a fish.

FIG. 1 is a perspective view showing a typical embodiment of the fish reef block of the present invention.

10~ of the area of the flat top plate 1 in the center of the flat top plate 1
A through hole 2 is provided whose width corresponds to a range of 30%. The top plate 1 needs to be a flat top plate in order to form a flat ceiling surface with good water flow, which is preferred by squid. However, it is sufficient that the surface is flat as a whole, and the surface does not necessarily have to be smooth. For example, it may be a flat surface with many shallow grooves so that laid eggs can easily adhere thereto.

The through hole 2 is important for improving drainage. If the area of the through hole is less than 10% of the area of the flat top plate 1, drainage will be insufficient, and if it exceeds 30%, it will be difficult to obtain a ceiling surface with a stable atmosphere suitable for spawning.

The shape of the flat top plate 1 is not particularly limited, but in order to provide a certain degree of variation and to form a spawning place with uniform conditions throughout, it is preferable to have a regular polygonal flat top plate, particularly a regular hexagonal flat top plate. A shaped flat top plate is preferred. In the case of a regular polygonal flat top plate such as a regular hexagonal shape, there is an advantage that there is no directionality when installing the fish reef block on the seabed, it is easy to sink, and it can respond to all kinds of tidal currents even after installation.

There is no restriction on the shape of the through hole 2, but in order to form a ceiling surface with uniform conditions throughout, the through hole should be a regular polygon similar to the shape of the flat top plate, and both regular polygons should be formed. It is preferable that the diagonals are provided so that they overlap.

Further, on the lower surface of the flat top plate 1, it is necessary that the plate-shaped legs 3 are vertically arranged and arranged radially around the center of the flat top plate. By vertically arranging the plate-like legs 3 radially on the lower surface, water flows into the through hole 2 from above the flat top plate 1 and flows out radially on the lower side of the flat top plate 1, or in the opposite direction. A flow passage is obtained.

As shown in FIG. 1, the plate-shaped legs 3 are arranged in a radial manner and placed at the diagonal of the regular polygon of the flat top plate 1 to ensure uniform flow. It is preferable from the top. In this case, the plate-like leg portion 3 is usually not provided in the area where the through hole 2 is present. Further, the plate-like leg portion 3 may be provided with holes for water passage in the horizontal direction as appropriate.

Further, the legs 3 are provided to extend radially to the periphery of the flat top plate 1, and the lower portions of adjacent plate-shaped legs 3 are connected to each other by connecting members 4 along the periphery of the flat top plate 1. connected. Like this, leg 3
are connected by the connecting member 4, so that the flat top plate 1
The mechanical strength of the leg portion 3 that is vertically installed is greatly improved. In particular, it is effective to provide this connecting member 4 when the number of plate-shaped legs 3 is small and the height is high, or when the seabed where the main fish reef block is to be sunk is uneven and the tidal current is strong. The connecting member 4 may be provided not only along the periphery of the flat top plate 1 but also over the entire lower part of the plate-like leg portion 3. However, since the seabed where spawning grounds for squid etc. are created is usually uneven, it is better to provide the connecting members 4 only in the area along the periphery of the flat top plate 1, which will improve the installation stability of the fish reef block. is good.

FIG. 2 is a perspective view showing an embodiment in which the fish reef block shown in FIG. 1 is placed at the lowest stage, and further fish reef blocks are stacked on top of it.

That is, the fish reef block shown in Figure 1 is placed at the bottom, and above it, a through hole with a width equivalent to 10 to 30% of the area of the flat top plate is placed in the center of the flat top plate 1 shown in Figure 3. 2, and plate-shaped legs 3 are provided on the lower surface of the flat top plate radially around the center of the flat top plate.
This is a fish reef block that is constructed by stacking fish reef blocks arranged vertically in multiple stages. The present invention thus provides a one-stage reef block (hereinafter also simply referred to as a reef block unit).
To provide a fish reef block which is integrated as a whole by stacking other fish reef blocks on top of the bottom layer. The most preferred embodiment of the present invention is one in which several stages are stacked like this. By stacking them in this way, the water flow becomes extremely good, which is the most desirable spawning environment for squid and the like. In other words, the water flows into the through hole 2 from above the reef block unit stacked on the top layer, and flows out radially from the gaps between the reef block units formed by the hanging legs 3, or in the opposite direction. A tidal passage for the flow is obtained. Usually, the latter flow becomes an upwelling flow, which provides good spawning grounds for squid and other species.

In addition, by stacking several layers, a wide ceiling surface can be secured in a relatively narrow space with an opening height of about 20 to 50 cm, which is suitable as a spawning ground for squid and the like. At the same time, a suitable shaded environment that squid and the like like can be obtained.

As a stackable fish reef block unit, a through hole with a width equivalent to 10 to 30% of the area of the flat top plate is provided in the center of the flat top plate, and a hole in the center of the flat top plate is provided on the lower side of the flat top plate. It is not particularly limited as long as it is a fish reef block with legs hanging radially from the center. However, as a preferred embodiment, as shown in FIG. 3, the lowest fish reef block unit has a fish reef block unit in which the lower parts of adjacent plate-shaped legs are connected to each other by a connecting member along the periphery of the flat top plate. This embodiment employs a block unit. By doing so, it is possible to provide the lowest reef block unit with legs that have sufficient mechanical strength against the weight of the stacked reef block units and the unevenness of the submerged seabed. Also,
It is desirable that the reef block units be properly fixed using bolts and nuts, for example.
For this purpose, for example, nuts may be embedded in advance in the plate-shaped legs and the flat top plate, and a metal fitting having bolt holes may be used to secure the two. Alternatively, linear through holes may be provided in the reef block unit from the top to the bottom, and reinforcing bars may be passed through the holes and tightened from above and below, or the outer periphery of the reef block or the inner periphery of the through hole may be tightened without providing any through holes. In this case, a method of sandwiching and tightening the reef block units from the uppermost stage to the lowermost stage can also be adopted as appropriate.

As explained above, the present invention provides a fish reef block that takes into account the stability of installation on the seabed. The structure of the fish reef block of the present invention creates a complex shading effect along with the tidal flow.
It can also be used as a reef for holding young finfish, not just squid.

[Brief explanation of drawings]

1 and 2 are perspective views showing typical embodiments of the reef block of the present invention, and FIG. 3 is a perspective view of the reef block used in the embodiment shown in FIG. 2. 1 is a flat top plate, 2 is a through hole, 3 is a leg portion, and 4 is a connecting member.

Claims (1)

[Claims] 1. 10 to 30 of the area of the flat top plate in the center of the flat top plate.
%, and plate-like legs are provided on the lower surface of the flat top plate and extend radially from the center of the flat top plate to the periphery of the flat top plate. Furthermore, the fish reef block is characterized in that the lower portions of adjacent plate-shaped legs are connected to each other along the periphery of the flat top plate by a connecting member. 2. The flat top plate is a regular polygonal flat top plate, and a through hole in the shape of a regular polygon similar to the regular polygon is provided in the center thereof so that the diagonals of both regular polygons overlap, and 2. A fish reef block according to claim 1, wherein plate-shaped legs are provided at diagonal lines of a regular polygon of the flat top plate as the legs perpendicular to the lower surface of the flat top plate. 3 Place 10 to 30 of the area of the flat top plate in the center of the flat top plate.
A through hole with a width equivalent to The legs of the lowest stacked fish reef blocks are provided to extend radially to the periphery of the flat top plate, and the lower parts of adjacent plate-shaped legs are interconnected along the periphery of the flat top plate. A fish reef block characterized by being connected by wood.