JPH0337401Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an artificial fish reef to which simulated seaweed is attached.

[Conventional technology]

In recent years, in order to cope with the trend of decreasing habitats for fish due to the devastation of bedrock embankments where seaweed grows, which is the habitat of fish, due to trawling methods, the installation of artificial fish reefs has been actively carried out. proposals have been made. The most widely used of these is concrete block fish reefs, which can be easily mass-produced. There is also a proposal to plant artificial seaweed made of synthetic resin and place it on the ocean floor.

[Problem that the invention attempts to solve]

Such concrete block fish reefs are easy to produce, but on the ocean floor where there are strong currents and waves, the sand at the bottom of the concrete block is gouged out by the current that collides with the bottom of the concrete block, causing the concrete block to topple over or become sandy. In many cases, the reefs become buried and are no longer able to function as fish reefs. In addition, it has been reported that alkaline content such as lime in the concrete blocks dissolves and prevents the growth of seaweed, so concrete block fish reefs are currently not producing the expected effects.

Therefore, an object of the present invention is to provide a novel artificial reef with simulated seaweed that eliminates the drawbacks of the conventional concrete block reef.

[Means to solve the problem]

In order to achieve the above object, the artificial fish reef with simulated seaweed according to the present invention has a concrete box body with an open top surface and a plurality of window-like openings formed on the side walls, and is made of natural stones with uneven surfaces on the side walls. A plurality of seaweed-attached bodies are arranged so as not to overlap each other in the vertical direction, and a box is placed between the plurality of seaweed-attached bodies and between the seaweed-attached bodies and the box body. In addition to forming a seawater flow path from the floor of the body to the top of the seaweed adhesion, stones of a size that fits between the spaces are laid at an appropriate height, and the top of the seaweed adhesion is It is characterized by having artificial simulated seaweed attached to it.

[Effect]

Since seaweed deposits are made of natural stones,
Unlike concrete blocks, alkaline content does not elute, and the side walls have uneven surfaces, which are the same conditions as natural rocks, creating an environment where seaweed can easily adhere to them. Furthermore, since multiple seaweed bodies are placed inside a concrete box, there is a risk that the sand at the bottom of these seaweed bodies may be gouged out by tides and waves, causing them to fall over or be buried in sand. There is no. Furthermore, the concrete box has multiple window-like openings formed in the side wall, and seawater flow paths are formed between each seaweed-attached body, so these window-shaped openings and seaweed-attached bodies As seawater flows through the seawater flow channels between the bodies in a complex manner, the time the seawater stays inside the box increases, and microorganisms such as plankton and shellfish carried in the seawater become attached to seaweed. The probability of adhesion to naturally grown seaweed and artificial seaweed artificially attached to seaweed bodies increases. Therefore, a good feeding ground is created for migratory fish. In addition, the seawater flow passages between the seaweed deposits provide suitable hiding places for fish.

〔Example〕

The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a perspective view of an artificial reef according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof.
In addition, in FIG. 3, the leaves of the pseudo seaweed are omitted to avoid complexity.

In the artificial reef 1 according to the present invention, the concrete box body 2, which is rectangular in plan view, has an open top surface and a closed bottom surface. Furthermore, window-like openings 3 are formed in the four side walls. The box body 2 is provided with legs 4 at four corners, and the legs 4 are embedded in sandy soil so that the box body 2 is stably installed on the seabed. Note that reinforcing reinforcing bars may be buried in the box 2 at appropriate locations.

A plurality of seaweed adherents 5 (six in the illustrated embodiment) are arranged inside the box 2. Each of these seaweed-attached bodies 5 is made of natural stone and has an uneven surface on the side wall portion. As the natural stone, it is preferable to use a rock from which alkaline content and metal components do not leach onto the surface, and for example, andesite, granite, etc. are suitable.
The uneven surface of the side wall of the seaweed adhering body 5 promotes the adhesion of seaweed and provides a hiding place for fish and shellfish, and may be formed by carving a flat stone, but it can also be formed by blasting a natural rock with dynamite. It is convenient to use a block of stone that has been formed into a roughly cubic shape or one that is not shaped into a square shape, as such a block of stone will have uneven surfaces on its side walls without any special processing. . Appropriate intervals are placed between these seaweed adherents 5, and this interval forms a seawater flow path 6. Further, it is preferable to provide a space between the seaweed adherent body 5 and the box body 2 to form a seawater flow path 7.

These seaweed adherents 5 allow natural seaweed to adhere to themselves and grow, but it takes time for the seaweed to grow, and most seaweed grows in the spring and dies in the fall, so it can be used throughout the year. In order to ensure adhesion of plankton and thereby promote the guidance of migratory fish, artificial simulated seaweed 8 is attached to each seaweed adherent 5. In order to attach the simulated seaweed 8 to the seaweed attachment body 5 made of natural stone, a hole is drilled in the upper part of the seaweed attachment body 5, the root of the simulated seaweed 8 is embedded in the hole, and mortar is poured into the hole to harden it. Bye. As pseudo-seaweed, synthetic resin films such as polyethylene and polystyrene, which have a specific gravity smaller than that of water, can be used, for example, as ``Habutae-nori'', which is a monolobed seaweed as shown in the front view of Figure 4 and the side view of Figure 5. '' is suitable because it is easy to manufacture. This pseudo seaweed 8 has a leaf part 8a, a stem part 8b and a root part 8c.
It is equipped with The leaf part 8a has a central part 8a ₁ and a leaflet part 8.
_a2 , and as shown in FIG. 5, a large number of small protrusions 8d are formed on the surface of the leaf, and uneven surfaces are formed on both the front and back surfaces throughout the leaf. Such an uneven surface can be easily formed by, for example, press-molding the simulated seaweed 8 using a mold with a rough surface. This pseudo seaweed 8 may be planted one by one in each of a plurality of small holes 9 made in the seaweed adhering body 5 as shown in FIG. A plurality of plants (for example, four plants) may be planted in each hole 10. Further, such small holes 9 and large holes may be provided together.

Types of seaweed that can be used as a model for pseudo-seaweed include the above-mentioned "Habotaenori", as well as the family Hitoaceae, the family Shiogata, the family Aminaceae, the family Hanemaceae, the family Iwazutaceae, the family Amitaceae, and the family Ami. Urinaceae, Urinaceae, Kelp family, Hondastra family, Ushikenori family, Rataraceae, Ryuumontaceae, Southern flower family, Coral family, Mukadenori family, Tsukasanori family, Mirinaceae, Atsuba Noriaceae, Hasushigusa, Suginoriaceae, Daisufamily, Mutsunagifamily, Igisidae, Konohanaidae,
Examples include the Fujimatsu family.

In addition, if stones of a size that can fit in the gaps are laid at an appropriate height in the gaps between each seaweed-attached body 5 and between each seaweed-attached body 5 and the box body 2, it is possible to create a better hiding place for fish. This is desirable because it provides a breeding ground and spawning area. However, even in this case, the height at which the stones are filled in these gaps must be limited so that the seawater flow paths 6 and 7 can be secured at a sufficient depth.

There are no particular restrictions on the dimensions of the box 2, the seaweed adherents 5, and the pseudo seaweed 8, but in the case of the above example, the box has a width of 170 cm, a length of 210 cm, and a height of 90 cm.
cm, the diameter of the window-like opening is 20 cm, the length of one side of the seaweed adherent is 50 cm to 60 cm, and the height of the pseudo seaweed 8 is preferably about 60 cm.

On the seabed, where there is a risk that the entire box 2 may be buried in sand, such burying can be easily prevented by installing the frames 2 in two or three tiers. In this case, the formation of the legs 4 of the upper box body 2 may be omitted.

Next, the function of this artificial reef 1 will be supplementarily explained. According to the above-mentioned dimensions, the concrete box 2 weighs more than 1 ton, and each seaweed adherent 5 made of natural stone weighs about 300 kg, so it can be used even on the seabed with strong currents and waves. It won't get swept away or fall over. In addition, seaweed adherents 5
Since the area of the bottom of the box 2 is extremely large compared to when the box 2 is installed alone on the seabed, even if some sand on the seabed at the bottom of the box is gouged out by the tidal current, the box 2
The chance of it falling is extremely small. Further, since the window-like opening 3 formed in the box body 2 communicates with the seawater flow passages 6 and 7, the seawater a flowing in from the window-like opening 3 flows into each seawater flow passageway 6, as shown in FIG. , 7, follows a complicated course while colliding with the seawater flowing in from other window-like openings 3, stays in the seawater flow passages 6 and 7 for a while, and then exits from the box body 2. . Therefore, microorganisms such as plankton and young shellfish carried by seawater become seaweed adherents 5.
The probability of adhesion to natural seaweed and artificial artificial seaweed 8 that grows on the seaweed increases significantly. Furthermore, the uneven surface formed on the simulated seaweed 8 prevents microorganisms and the like attached to the simulated seaweed 8 from being washed away by the current, thereby improving the colonization rate of the microorganisms and the like.

[Effect of idea]

As described above, according to the present invention, since a plurality of seaweed-attached bodies are placed inside a concrete box, there is no possibility that these seaweed-attached bodies will fall or be buried by currents or waves. There is no risk of them colliding with each other and damaging them, and they can maintain their function as a fish reef for many years.
The seaweed-attached body made of natural stone does not elute alkaline content like concrete blocks, and since the side walls have uneven surfaces, seaweed can easily grow there. In addition, since the seawater that enters through the window-like opening of the box body and flows through the seawater flow path between the seaweed adherents has a long residence time inside the box body, the rate of attachment of microorganisms to seaweed and pseudo-seaweed increases, and migratory fish. In addition to forming a particularly good feeding ground, the seawater flow passages between the seaweed deposits provide suitable hiding places for fish, resulting in the formation of an excellent fish reef as a whole. In particular, the seawater flow passages have a depth that reaches from the floor of the box to the top of the seaweed deposits, and since these seawater flow passages communicate with each other, there is no external interference around each seaweed deposit. Seawater circulates sufficiently, and therefore microorganisms, seaweed, etc. adhere uniformly over the entire surface of each seaweed-attached body, providing an efficient feeding ground. In addition, stones of a size that fits between the seaweed bodies that form seawater flow channels are laid at an appropriate height, so that they work together with the uneven surfaces of the side walls of each seaweed body. In addition to providing better hiding places and spawning places for fish, it creates a suitable environment for hiding places for various edible fish that require relatively large spaces, not just sea urchins and abalone. It can attract edible fish.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the artificial reef according to the present invention, Figure 2 is its front view, Figure 3 is its top view, Figure 4 is its front view showing an example of simulated seaweed, and Figure 5 is its side view. FIG. 6, and FIG. 7 are diagrams each showing a mode in which pseudo seaweed is attached to a seaweed adherent. 1...Artificial fish reef, 2...Box body, 5...Seaweed adhering body, 6...Seawater flow passage, 8...Pseudo seaweed.

Claims (1)

[Scope of utility model registration request] In a concrete box with an open top surface and a plurality of window-like openings formed on the side walls, a plurality of seaweed deposits made of natural stone with uneven surfaces on the side walls are placed so as not to overlap each other in the vertical direction. A seawater flow path is formed between the plurality of seaweed-attached bodies and between the seaweed-attached bodies and the box body to reach the top of the seaweed-attached bodies from the floor surface of the box body. At the same time, each flow path is made to communicate with each other, stones of a size that fits between them are laid at an appropriate height, and artificial simulated seaweed is placed on the top of the seaweed adhesion. An artificial fish reef with simulated seaweed.