JPH0354540B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fish reef/vegetation block that is installed at the bottom of oceans, rivers, and lakes and is used to promote the reproduction of fish and the growth of underwater plants. It is.

(Conventional technology) In order to solve the problem of depletion of fisheries resources and to create and maintain a good natural environment, the purpose is to artificially provide spawning grounds for fish and refuge areas for fry and young fish to protect themselves from external predators. Reef blocks with various shapes and structures have been proposed.

(Problems to be Solved by the Invention) However, conventional fish reef blocks only create a space for fish to nest, migrate, or retreat, and plant seeds and spores settle on the fish reef blocks, allowing plants to flourish. There's nothing to do.

In fish reef blocks where aquatic plants and algae do not colonize, there are few suitable targets for fish to lay their eggs.
There is a high risk that the eggs that have been laid will be washed away.
Additionally, because there is little shelter for fry and young fish to hide from predators, and they are easily preyed upon by predators, the rate at which they grow into adults is slow to improve.

Furthermore, even when fish spawn and hatch, aquatic plants do not colonize the reef block well, and when the supply of oxygen from plants is low, the balance of the small ecosystem is disrupted, causing an oxygen-deficient condition. and pose a major threat to the survival of fish.

Furthermore, in rivers and other areas where aquatic plants and algae do not thrive, it is difficult for various aquatic insects and microorganisms, such as firefly larvae, to grow, and it is completely impossible to restore the clear and elegant natural environment where fireflies fly wild. be.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fish reef/vegetation block that can reliably establish and grow plants and actively create an environment suitable for spawning, hatching, and growth of fish.

(Means for Solving the Problems) As explained below using the reference numerals in the attached drawings, in the fish reef/vegetation block of the present invention, the space including the shelf section 10 for growing plants is used for fish migration or nesting. It communicates with the storage cavity part 2, and contains or has fixed plant nutrients, plant seeds, spores, and seedlings in the plant cultivation shelf part 10 itself or in the recessed part 11 formed in the cultivation shelf part. The vegetation pine 20 is fixed.

(Example) In the fish reef/vegetation block shown in FIGS. 1 to 21, a cavity 2 for fish 9 to migrate or nest.
The cavity is surrounded by a back wall 3 of the block main body 1, a pair of left and right side walls 4 diagonally intersecting the back wall 3, and a front wall 5 parallel to the back wall 3, and is formed into a trapezoidal shape in plan view. Part 2 penetrates vertically.

The upper part of the front wall 5 of the cavity 2 is provided with a rectangular opening 6 spanning the entire width, and the side wall 4 is provided with a circular opening 7 close to the rear wall 3. These openings 6 and 7 also serve as entrances for fish, and also serve as entrances for plants 8 to enter the cavity 2.

At the lower ends of the pair of left and right side walls 4, a bottom wall 10 having a triangular shape in plan view is provided to protrude laterally.
serves as a shelf for growing plants. The bottom wall 10
Three groove-shaped upward recesses 11 are arranged in parallel along the side wall 4 on the upper surface. These upward recesses 11
A vegetation pine 20 is fitted and fixed to the area.

The block main body 1 is installed in a downstream direction on a river bed 12 at the installation location so that the bottom wall 10 is inclined with respect to the horizontal line. A shaped recess 13 is formed. Earth and gravel 14 are deposited in this concave portion 13, providing a medium on which plant seeds, spores, etc. can settle.

Upward recesses 11 are also provided on the upper surfaces 4a of the left and right side walls 4 and the bottom surfaces 6a of the openings 6 of the front wall 5, and the upper surfaces 4a of the left and right side walls 4 and the bottom surfaces 6a of the openings of the front wall 5 also serve as shelves for growing plants. It constitutes the surface part. A vegetation pine 20 is fitted and fixed in the upward recess 11. As shown in FIGS. 3 and 4, the upper surface 4a of the left and right side walls 4 in the portion where the upward recess 11 is provided.
When blocks are stacked one after another, they will not overlap with the blocks above.

When stacking blocks as shown in Figures 1, 2 and 3, the back wall 3 of the lower block
The upper surface protrusion 15 is fitted into the lower surface receiving groove 16 of the rear wall of the upper block. In order to firmly connect and integrate the upper and lower blocks, reinforcing bars 19 are inserted through the vertical holes formed by the semicircular grooves 17 on the left and right end faces of the back wall 3 and the vertical hole 18 in the center of the back wall 3. , the space around the reinforcing bars 19 is filled with cement mortar according to a conventional method.

As shown in FIG. 35, the dimension between the outer surfaces of the left and right pair of bottom walls 10, 10, which are triangular in plan view, decreases slightly toward the front side, and the dimension between the upper surface protrusion 15 and the lower surface receiver Since play is ensured between the grooves 16, the block body 1 can not only be installed in a straight line, but also can be laid with an appropriate curve.

Figures 15 to 21 show end blocks that are inserted every other step into the left and right ends of a block-stacked fish reef, and the cavity 2 for fish nesting or migration is
The rear wall 3 and left and right side walls 4 form a triangular shape in plan view, and the cavity 2 also penetrates vertically.

In the blocks shown in Figures 22 to 31,
The cavity 2 for fish nesting or migration is formed into a rectangular shape in plan view by a back wall 3, left and right side walls 4 perpendicular to the back wall, and a front wall 5, and a bottom wall 10 has a rectangular shape in plan view at the lower end of the side wall 4. It protrudes in a shape to provide a wider shelf surface for growing plants.

In the embodiment shown in FIGS. 32 and 33, a vegetation pine 20 is fixed with an adhesive 12 to an upwardly directed recess 11 formed in a shelf for growing plants. still,
The method of fixing to prevent it from being washed away may be done by driving a lock pin or the like instead of using adhesive, or simply fitting and fixing may be used depending on the flow conditions at the installation location.

In the embodiment shown in FIG. 33, the entrance/exit for fish or the opening 6 for entry of plants in the front wall 5 is as follows:
It is formed at the lower part of the front wall 5. Also, the 34th
In the embodiment shown in the figure, an opening 23 is provided in the back wall 3, which opens into a mud wall 22 such as a river. Therefore, fish and aquatic creatures that have the habit of seeking burrows in muddy soil, such as eels, pass through the opening 23 into the cavity 2.
You can go in and out.

In the embodiment shown in FIG.
is not provided, and the vegetation pine is fixed to the flat upper surface of the bottom wall 10.

The present invention can be implemented in various forms, and the shape, orientation, and arrangement of the cavity for fish migration or nesting and the shelf for growing plants are not limited to those shown in the drawings. When the vegetation pine is fixed to the block with an adhesive or the like as described above, the shelf surface for growing plants may be tilted backwards toward the front, and the vegetation recess 11 may be provided facing downward or sideways. .

(Effects of the Invention) As described above, in the block of the present invention, the space including the shelf section 10 for growing plants communicates with the fish migration or nesting cavity section 2, and the shelf section 10 for growing plants itself or Vegetation pine 20 that contains or has plant nutrients, plant seeds, spores, and seedlings fixed in the recess 11 provided in the shelf 10 for growing plants.
Because the blocks are fixed, the intended plants can be actively established and flourished on the blocks without relying on the chance of natural adhesion of seeds and spores, making it possible to efficiently create a state of coexistence between fish and useful plants. can.

Plants that are thicker than this vegetation pine 20 serve as good targets for fish to lay their eggs, and also provide cover for fry and young fish to hide from predators. significantly reduces the risk of being predated by Furthermore, since oxygen is constantly supplied from the plants that have settled on the blocks, an oxygen deficiency condition does not easily occur, and the growing environment for fish is maintained and improved. Therefore, the growth rate from eggs to adults is considerably improved, which is beneficial for the reproduction and proliferation of fishery resources.

In addition, the presence of vegetation pine 20 allows aquatic plants and algae to take root and flourish, making it easy for various aquatic insects and microorganisms such as firefly larvae to grow, restoring a good natural environment where fireflies fly turbulently. can be done.

[Brief explanation of drawings]

1 to 21 show a fish reef/vegetation block according to an embodiment of the present invention, FIG. 1 is a perspective view of the block in a laid state, and FIG. 2 is taken along M-M in FIG. FIG. 3 is a front view of the block as seen diagonally from above, and FIG. 4 is a plan view of the block as it is installed. 5 is a front view of the block, FIG. 6 is a top view of the block, FIG. 7 is a bottom view of the block, FIG. 8 is a right side view of the block, and FIG. FIG. 9 is a rear view of the block, FIG. 10 is a cross-sectional view taken along the line A--A in FIG. 5, FIG. 11 is a cross-sectional view taken along the line B--B in FIG. 5, and FIG. C in Figure 5
-C line sectional view, and FIG. 13 is D-D in FIG.
FIG. 3 is an end view of a line cut portion. FIG. 14 is a front view of the end block, FIG. 15 is a top view of the block, FIG. 16 is a bottom view of the block, and FIG. 17 is a left side view of the block. , FIG. 18 is a rear view of the block, FIG. 19 is a sectional view taken along the line E-E in FIG. 14, and FIG.
21 is a sectional view taken along the line FF in FIG. 4, and FIG.
FIG. 3 is an end view of a section cut along line GG in the figure. 22 to 31 show a fish reef and vegetation block according to another embodiment of the present invention, FIG. 22 is a front view of the block, FIG. 23 is a plan view of the block, and FIG. Figure 24 is a bottom view of the block, and the second
5 is a right side view of the block, FIG. 26 is a rear view of the block, FIG. 27 is a sectional view taken along line H--H in FIG. 22, and FIG. 28 is a cross-sectional view taken along line I in FIG. -I line sectional view, and FIG. 29 is J in FIG. 22.
-J line sectional view, and Fig. 30 is a K-J line sectional view of Fig. 22.
31 is a sectional view taken along the line K, and FIG.
FIG. 32 to 34 are longitudinal sectional views of reef and vegetation blocks according to different embodiments of the present invention, respectively. FIG. 35 is a plan view of a reef/vegetation bath according to still another embodiment of the present invention. 1... Fish reef and vegetation block, 2... Cavity for fish migration or nesting, 3... Rear wall, 4... Side wall, 5... Front wall, 6... Opening, 7... Opening. , 8...Plant, 9...Fish, 10...Bottom wall constituting a shelf for growing plants, 11...Recess for vegetation, 12...River bed, 13...Recess for vegetation, 14
... Earth and sand, 15 ... Top projection, 16 ... Bottom receiving groove, 17 ... Semicircular groove, 18 ... Vertical hole, 19 ...
...Reinforcement bar, 20... Pine for vegetation, 21... Adhesive, 22... Earth wall of river etc., 23... Opening.

Claims (1)

[Claims] 1. A space including a shelf for growing plants is connected to a cavity for migrating or nesting fish, and the space containing the shelf for growing plants or the recesses formed in the shelf for growing plants contains nutrients and plants. A fish reef/vegetation block to which vegetation pine containing or fixed seeds, spores, and seedlings are fixed.