JPH049491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to reefs for rotifers such as rotifers, daphnia, crustaceans such as shrimp, and fish in fish farms, lakes, and inland seas.

<Conventional Technology> Most of the large fish reefs currently in use are made of concrete, which requires enormous manufacturing and installation costs, and once installed, it is difficult to relocate them, and they can become buried by quicksand.

In addition, it is used as a fish reef and spawning algae for young fish and small fish.
Although cedar branches, willow roots, and sagebrush hair are used, they rot over many years and cause water quality to deteriorate.

Furthermore, Japanese Utility Model Application Publication No. 56-129272 discloses ``suspending a bag-like or cylindrical net on a fish reef frame to which a float is attached.'' Also, Akira Jigen
The microfilm (issued by the Japan Patent Office on October 25, 1982) containing the contents of the specification and drawings attached to the application No. 56-55703 (Utility Model Application No. 57-169063) contains
In a pickling fishing raft (artificial fish reef) using net fabric, a "bundle of net fabric" is disclosed as a hanging object.

<Problems to be Solved by the Invention> However, it has been found that each of the above artificial reefs has the following problems.

(1) Because the structure is such that a bundle of cylindrical nets and net fabrics is suspended directly from the reef frame, the workability of setting and replacing the reef plates (reef elements) was not good.

(2) Because the fish reef element is a bundle of cylindrical nets/net fabrics, it tends to be bulky or the nets tend to get entangled with each other, which tends to cause problems in the transport and handling of the artificial reef unit. It was.

In view of the above, an object of the present invention is to provide an artificial reef that has good workability in setting and replacing reef plates, and also has good workability in transporting and handling the artificial reef unit.

<Means for Solving the Problems> The artificial reef of the present invention solves the above problems with the following configuration.

In an artificial reef consisting of a rectangular reef frame to which a float is attached and a plurality of reef plates suspended from the reef frame at regular intervals, the reef frame consists of a plurality of rod-shaped bodies suspended in parallel. The reef plate may be provided with slits on both sides, and the reef plate is constructed by connecting upper ends of a plurality of flat mesh pipes to an upper reef plate rod, and the upper reef plate rod is engaged with each slit of the reef frame. The above-mentioned fish reef board is suspended.

<Example> Hereinafter, the present invention will be described in detail based on illustrated examples.

In the present invention, the fish reef plate 6 is composed of a plurality of flat net pipes as shown in FIG. Here, in culture ponds for rotifers and daphnia, fish reefs for young fish, and fish reefs in lakes, the net wires 2 of the flat net pipe 1 have a thickness of 0.5~
2 mm, the mesh spacing is about 3 to 30 mm, and the mesh pipe width is about 5 to 20 cm.For fish reefs in inland seas, the wire thickness of mesh pipe 1 is 2 to 6 mm, and the mesh size is 20 cm.
An extrusion molded product of polyethylene resin or polypropylene resin with a diameter of ~100 mm and a net pipe width of approximately 20 to 60 cm is optimal because it can be mass-produced at low cost.

In order to create a fish reef according to the water depth of the place where the fish reef is to be installed, a flat net pipe 1 is cut according to the length of the fish reef to be created, dozens to hundreds of them are arranged vertically at regular intervals, and the upper end is cut. The lower end is wrapped around the upper reef board rod 4 and fixed with heat welding, staples, wire, etc., and the lower end is wrapped and fixed around the lower reef board rod 5 in the same way as the upper part. The blinds are made of flat mesh pipes, which are passed through every other secondary pipe in the horizontal mesh direction perpendicular to the vertical mesh pipes, and the contact area between the horizontal mesh pipes 1' and the vertical mesh pipes 1 is bonded by heat welding or a sewing machine. The reef plate 6 is fitted into the slits 11 of a rectangular reef frame 3 in which a large number of slits 11 are carved according to the thickness of the upper reef plate rod 4 to form a suspended fish reef. 3 is suspended by a float 7 and a suspension rod.

If a fish reef is required from the upper layer, it is sufficient to shorten the suspension rod 8 or attach the float 7 directly to the fish reef frame 3.

Further, as shown in Fig. 5, the horizontal mesh pipe may be omitted for fish reefs in relatively shallow water depths, and only the vertical mesh pipe is used, with the upper end wrapped around the reef plate rod 4 and fixed, and the lower end wrapped around the weight rod 13 and fixed. In this way, each net pipe 1 becomes a curtain-like reef with individual hangings.

If the water is shallow at the location where it is installed, you can prevent it from moving due to currents or currents by setting stakes on all sides and tying the float 7 to the stakes, or lowering the anchor and tying it to the anchor in deep locations.

In places where there are strong currents or whirlpools, the problem of preventing the reef plates 6 hanging from the reef frame 3 from getting entangled with each other can be solved by connecting the lower reef plate rods 5 with connecting rods 10.

The distance between vertical mesh pipes is 1 to 2000 mm, the distance between horizontal mesh pipes is 50 to 2,00 mm, and the distance between reef plates 6 is 1 to 2,000 mm.
The mesh pipe spacing and the slit spacing can be freely selected from 30 to 2000 mm depending on the fish species and the installation location, and if damage occurs, the fish reef board 6 can be easily replaced.

The reference numeral 9 in the figure is a holding plate that prevents the reef frame 3 from falling off the numerous reef frames 6 fitted into the slits 11 of the reef frame 3.

The reef frame 3 and the reef plate rods 4 and 5 are made of stainless steel, etc., which are inexpensive, easy to process, and durable, and the lower reef plate rod 5 also serves as a weight.

<Actions and Effects of the Invention> Since the present invention has the above configuration, it has the following actions and effects.

(1) The reef plate can be set in the reef frame simply by engaging the upper reef plate rod with each slit in the reef frame and hanging it, which improves the workability of setting and replacing the reef plate. Furthermore, if the slit spacing of the fish reef frame is made small, the spacing between the fish reef frames can be arbitrarily selected depending on the purpose, such as for young fish or for the open sea.

(2) In addition, since the unit is a combination of a fish reef plate with flat net pipes connected to the above-mentioned fish reef plate rods and a rectangular fish reef frame, the artificial reef does not become bulky and the net bodies do not become entangled with each other. The unit is easy to transport and handle.

[Brief explanation of drawings]

Figure 1 is a perspective view of a flat mesh pipe that is the base material of the reef, Figure 2 is a perspective view of the reef frame, Figure 3 is a front view of the reef plate of the first example, and Figure 4 is the reef of Figure 1. Board A-A
, FIG. 5 is a front view of a fish reef plate of a second example, FIG. 6 is a side view of a fish reef plate of a second example, FIG. 7 is a plan view of a fish reef of the present invention, and FIG. 8 is a front view of a fish reef plate of a second example. FIG. 9 is a front view of the fish reef of the present invention, and FIG. 9 is a side view of the fish reef of the present invention. 1...Flat mesh pipe, 1'...Flat horizontal mesh pipe, 2
... Net wire, 3 ... Fish reef frame, 4 ... Upper reef plate rod, 5 ... Lower fish reef plate rod, 6 ... Fish reef plate, 7 ...
Float, 8... Suspension rod, 9... Presser plate, 10... Connecting rod, 11... Slit, 12... Adhesive part, 13
...A weight bar.

Claims (1)

[Claims] 1. An artificial reef consisting of a rectangular reef frame to which a float is attached and a plurality of reef plates suspended from the reef frame at regular intervals, wherein the reef frame has a plurality of reef plates suspended from the reef frame at regular intervals. slits are provided on both sides so that rod-like bodies can be hung in parallel; the reef plate is configured by connecting upper ends of a plurality of flat mesh pipes to an upper reef plate rod; and the upper reef plate rod is connected to the reef frame. An artificial reef, characterized in that the reef plate is suspended by being engaged with each slit.