JPH0443014Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is constructed so that they are stacked on the bank of a river in stages or on a steep slope, have a cavity inside, and allow fish to enter the cavity. Regarding the improvement of fish nest blocks.

[Conventional technology]

Various types of fish nest blocks have been developed and put into practical use on river banks, each having a cavity into which young fish can enter.

FIG. 5 illustrates such a block.

A conventional fish nest block 1 installed on a riverbank has an opening 2 on the front side facing the waterway, so that young fish and the like can freely enter and exit the cavity 3 inside the fish nest block 1.

Traditionally, it was thought that fish nest blocks like this were a place where young fish could live safely in the cavity, but in reality, most of them are not safe because there is no protection against large fish and other external enemies. It has recently become clear that it will not be used as a place.

[The problem that the idea attempts to solve]

From this perspective, there is a need to reconsider the shape and livability of conventional fish nest blocks installed on riverbanks.

The present invention was researched and developed in view of these circumstances, and the purpose is to provide an improved fish nest block that is equipped with a protective body at the waterway side opening of the fish nest block so that young fish can actually use it. do.

[Means to solve the problem]

The present invention provides a fish nest block for riverbanks having a cavity, which includes a horizontal locking rod provided parallel to the opening surface near the lower edge or near the upper edge of the opening on the waterway side of the block, and a large number of elongated tape-like rods. artificial grass, and a flexible fixture for locking the artificial grass to the locking rod, each of the flexible fixtures has two hollow cylinders with a part of the circumference cut out, and the outer diameters of the flexible fixtures are parallel to each other. One of the hollow cylinders removably holds the artificial grass through a round rod, and the other hollow cylinder removably and slidably locks on the locking rod. This is a fish nest block that is characterized by

[Effect]

In the present invention, a freely movable floating or hanging body consisting of a tape-like long and thin multi-strand body, that is, artificial grass, is attached like a curtain to the opening of a fish nest block, thereby providing a shelter-like habitat for fish.

The position and direction of the opening of the block to which the floating body or hanging body of the present invention is attached like a curtain is not limited as long as it opens into the waterway.

At the attachment part of the artificial grass of the fish nest block of this invention,
As shown in FIG. 3, a flexible fixture 8 is made by connecting two cylinders 9 and 10 in parallel with each other with a part of the circumference missing.
Use. The round rod can be held by pushing open the missing portion of the cylinder of the flexible fixture 8 and fitting the round rod into the cylinder. FIG. 2 shows the installed state. It can be easily attached and detached.

〔Example〕

An example is shown in FIG.

In this embodiment, the waterway example opening 2 of the fish nest block 1 is
A round bar 5 is placed horizontally on the lower edge 4 of the opening 2 in parallel with the opening 2,
A synthetic resin-based artificial grass 6 was attached to this. The round bar 5 may have both ends bent and the ends embedded in the frame of the block 1, with some of the reinforcing bars of the block 1 exposed.

An example of artificial grass 6 is shown in FIG. The artificial grass 6 has a synthetic resin tape 7 with a bulk specific gravity of about 0.5 attached to the mounting tool 8.
A large number of them are installed in parallel, and underwater,
It stands up straight, almost like grass, and sways in the flow of water. The substrate for this artificial grass should preferably have a smooth surface and either algae will not adhere to it or algae will easily peel off, and a synthetic resin product with excellent weather resistance and corrosion resistance is preferable.

The artificial grass fixture 8 has a shape as shown in FIG. 3, for example, and consists of a holding part 9 that holds the artificial grass 6 together with a round rod, and a locking part 10 that locks on the round rod 5.
Preferably, a plastic product is elastic enough to be easily installed and removed.

FIG. 4 shows another embodiment in which a hanging body 11 hung like a curtain is attached to the opening surface of a fish nest block. The hanging body 11 is made of a large number of tapes 12 having a specific gravity of 1.2 or more arranged in parallel, and is preferably made of a synthetic resin product mixed with a material having a high specific gravity.

In the river where the fish nest block 1 of the embodiment shown in FIG. 1 was installed, young fish were observed to enter the fish nest block 1 and live there safely.

[Effect of idea]

In the fish nest block of the present invention, it has been observed that a moderate amount of sand accumulates in the cavity of the block, which provides an environment suitable for the production of fish eggs, and also provides a cavity for young fish to live safely. The purpose of the installation is achieved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a perspective view of an example of artificial grass, Fig. 3 is a perspective view of an example of its locking part, and Fig. 4 is a perspective view of another embodiment. FIG. 5 is a perspective view of an example of a fish nest block. 1... Fish nest block, 2... Opening, 3... Hollow, 4... Lower edge, 5... Round bar, 6... Artificial grass,
7... Tape, 8... Mounting tool, 9... Clamping part, 1
0...Locking part, 11...Hanging body, 12...Tape.

Claims (1)

[Scope of Claim for Utility Model Registration] In a fish nest block for a river bank having a cavity, a horizontal locking rod provided near the lower edge or near the upper edge of an opening on the waterway side of the block parallel to the opening surface; It comprises a large number of elongated tape-shaped artificial grass and a flexible fixture that locks the artificial grass to the locking rod, and each of the flexible fixtures has two pieces with a part of the circumference cut off. Hollow cylinders are fixed in parallel on the outer diameter, one of the hollow cylinders removably holds the artificial grass via a round rod, and the other hollow cylinder is removably attached to the locking rod. A fish nest block characterized by being slidably locked.