JPH047739Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Purpose of the invention> Industrial application field This invention relates to fish and shellfish protection reefs in Thailand, etc. ), it is suitable for the spawning of fish such as sea bream and flounder, the protection and cultivation of young, immature, and adult fish, and the cultivation of seaweed beds. Pertains to protected reefs that can be grown in a protected state without attracting natural enemies such as rockfish.

Conventional technology Generally, in order to effectively catch fish and shellfish, so-called artificial reefs are installed in the sea in place of natural fishing reefs.
Active efforts are being made to create fishing grounds.
These artificial fishing reefs are used exclusively to gather mature fish and shellfish to form fishing grounds with high fishing efficiency, and are called fishing reefs for collecting fish. These fishing reefs began with the use of industrial waste such as old ships, old cars, and old tires, but recently they have been made by assembling and molding concrete, steel, stone, synthetic resin, etc. into box shapes, lattice shapes, etc. is being used.

In response to this, due to the abnormal depletion of marine resources, protective reefs have been proposed and implemented to not only collect fish and shellfish, but also to attach eggs of fish and shellfish, hatch them, and protect and nurture young fish. .

This protective reef forms a habitat and protection environment suitable for the protection and growth of young fish, etc. Specifically, it is suitable for the settlement and habitation of diatoms and other food organisms, and is suitable for the continued growth of young fish, etc. It is necessary to meet conditions such as being fit for rest and residence.

However, regardless of whether conventional fish reefs are used for collecting fish or for protection and cultivation, sea bream and flounder, unlike other fish and shellfish, tend to dislike the shaded areas of fish reefs. If conventional fish reefs that are actively formed are used, young fish such as sea bream and flounder will be preyed upon by natural enemies such as horse mackerel and rockfish, making the purpose unattainable.

In other words, Utility Model Application No. 61092 (1977) and Utility Model Application No. 61092 (1977)
The fish reef described in No. 16095 is a so-called rod-shaped fish reef, and in this fish reef, a fibrous body is provided in at least a part of the strand etc. so as to protrude from the strand etc.

In this rod-shaped fish reef, a shaded area is actively formed between each fiber body, and this shaded area protects spawning and young fish from natural enemies and provides a place where they can continuously rest and live. be.

Furthermore, the fish reef described in Utility Model Application Publication No. 57-201163 is made by attaching a flocking board to the surface of a truncated conical or truncated pyramid-shaped concrete base, and planting fibers on the surface of the flocking board. . In this fish reef, many shaded areas suitable for growing young fish are formed on the surface of the flocked board, and these shaded areas protect the young fish from natural enemies.

However, any fish reef actively forms shaded areas, and as described later, it is not suitable for protecting and growing fish such as sea bream and flounder, which dislike these shaded areas.

Problems to be solved by the invention This invention aims to solve the above-mentioned drawbacks, and specifically, unlike conventional fish reefs, it does not form a shaded area as much as possible, and actively allows water to pass through inside. Furthermore, by promoting the generation of eddies, it is possible to protect natural enemies such as horse mackerel from approaching, and at the same time, it is possible to protect sea bream, flounder, etc., which can successfully breed mysids, green shrimp, polychaetes, and other main prey organisms. We propose a protective reef suitable for breeding.

<Structure of the invention> Means for solving the problems and their effects In other words, the protective reef according to the present invention has a structure in which a plate-like growth body having a mesh fibrous body is interposed between a plurality of supports protruding from the surface of a base. At the same time, a predetermined space is surrounded by these plate-like growth bodies, at least one penetration part is formed in the base, a support part is attached to the bottom surface of the base, and further, the above-mentioned It is characterized by being provided with a through part and a window part communicating with the space.

To explain in more detail, before constructing this protective reef, the inventor focused on the fact that fish such as red sea bream behave differently from other fish, and after examining this behavior, he came up with the following findings. Obtained.

First, looking at young red sea bream, young red sea bream have a habit of gathering on fish reefs. However, unlike other fish, young red sea bream do not enter the interior of the reef, that is, the shaded area, but instead migrate around the reef. Also, during the day they are distributed around fish reefs and migrate, but at night they leave the reef and find depressions on the sea floor nearby and rest there.

It is generally said that the natural enemies of young fish such as sea bream and flounder are horse mackerel and rockfish. These fish, such as horse mackerel and rockfish, have strong reef properties and actively enter the shaded areas formed by fish reefs, where they prey on young fish such as sea bream and flounder. For this reason, young fish such as sea bream and flounder have a narrow range of activity, but they have the habit of not entering the interior of fish reefs, that is, the shaded areas.

Next, when looking at adult and immature fish, their home ranges are related to water temperature and water depth, but they generally move in shallow layers of 30 meters or less with water temperatures of 16 to 19 degrees Celsius, and their home ranges extend over several kilometers. However, adult fish such as sea bream and flounder, as well as immature fish, are strongly reef-like, and if a reef exists, they will be distributed within 200 meters of the surrounding area.
They immediately evacuate when their natural enemies approach, but they never enter the interior of the reef, that is, the shaded area, and in this respect they are similar to young fish. Furthermore, although they actively feed around fish reefs, they do not go inside the reefs, instead using the depressions on the sea floor around the reefs as hiding places.

In short, a protective reef for sea bream, flounder, etc., has a structure that does not attract fish that are natural enemies of the young fish, such as horse mackerel and other natural enemies, in other words, a structure that has no shaded areas and allows for good flow of current and the formation of eddies. Along with this, an uneven area created by sand ripples, scouring, etc. is created as a "hiding place" around the fish reef, and the structure is constructed so that food organisms for adult fish and immature fish can breed and gather. It becomes necessary. Furthermore, since protective reefs for sea bream, flounder, and the like are installed in shallow waters with relatively high waves, they must be constructed with a structure that can withstand these external forces, and this structure must be compact and highly portable.

The present invention was established based on the above-mentioned findings, and the structure of these means and their operation will be explained in more detail with reference to the drawings as follows.

Note that FIG. 1 is a perspective view of a protective reef according to one embodiment of the present invention, and FIGS. 2 and 3 are perspective views of protective reefs according to other embodiments, respectively.

First, in Fig. 1, reference numeral 1 indicates a base, 2 indicates a support, and 3 indicates a plate-like growth body.The base 1 is made of a flat plate-shaped material, such as concrete, steel, reinforced synthetic resin such as FRP, etc. Configure.

A plurality of supports 2 are vertically mounted on this base 1. The strut 2 is usually made of the same material as the base 1 and is integrally constructed, but the strut 2 does not have to be made of the same material. It can also be constructed so that it can be easily assembled near the installation location. In addition, each pillar 2 is
As shown in the figure, it is not necessary to arrange them at each corner of the quadrilateral, but they can be arranged in any manner.

Next, a plate-like growth body 3 is inserted between each strut 2. In this case, the plate-like growth bodies 3 can be integrally fixed between the struts 2, but longitudinal grooves (not shown) are formed between the adjacent struts 2 on their opposing surfaces, and the plate-like growth bodies 3 can be fixed between the struts 2. It can be inserted between the pillars 2 via the longitudinal groove in a freely assembled manner. In addition, each plate-like growth body 3
consists of a frame 3a and a fibrous body 3b, and each fibrous body 3b is usually made of a filament of nylon or other synthetic resin, and the fibrous bodies 3b of these filaments are combined to form a network. . Further, although the frame 3a is usually configured in a rectangular shape, it can be configured in any shape.Furthermore, the frame 3a can be configured from any material as long as it has corrosion resistance and a certain degree of strength. .

Next, in the base 1 having a flat structure as described above, at least one penetrating portion 1a is formed, for example, approximately in the center. Also, on the bottom of the base 1,
Support parts 4, such as blocks, are attached to at least the four corners, and windows 5 are formed between these support parts 4. Therefore, when installed on the seabed, the base 1 rises from the seabed, and the current flows from the window 5 between the support parts 4 through the internal space 6 surrounded by the penetration part 1a and the plate-like growth body 3. Make it fluid.

That is, when the plate-like growth body 3 having the fibrous bodies 3b combined in a mesh shape is inserted between the struts 2, the internal space 6 is completely exposed through the mesh of the fibrous bodies 3b, and the space 6 is completely exposed inside and outside. No shadow is formed at all. Therefore, sea bream, flounder, etc. enter the internal space 6 and grow by eating food organisms, algae, etc. attached to the fiber body 3b. Also, base 1
A penetrating portion 1a is formed in the center of the base 1, and a window 5 is formed between the supporting portions 4 on the bottom surface of the base 1.
Since this window portion 5 communicates with the penetration portion 1a and the interior 6, the seawater entering the window portion 5 rises as a tidal current through the penetration portion 1a and reaches the interior 6, and the tidal current flows through the plate-like proliferators 3. It is distributed through the network of Therefore, the food organisms and algae attached to each fiber body 3b grow in response to this current, and they can receive sufficient natural light, providing a good breeding place for sea bream, flounder, and the like. In this case, even if a natural enemy such as a horse mackerel approaches, the entire internal space 6 will be exposed and no shadow will be formed, and the bottom of the base 1 will also rise to the surface, allowing the tide to flow there. Therefore, no shadows such as stagnation of seawater are formed. For this reason, fish such as red sea bream rarely enter the interior due to their habit, and sea bream and flounder can be raised while being protected from natural predators.

In addition, for places where sea bream and flounder can hide, it is sufficient to form a separate depression on the seabed around the fish reef.

Further, as shown in FIG. 2, a new window 7 can be formed between the plate-like growth body 3 and the base 1.

That is, the protective reef shown in FIG. 2 has a window 7 also provided between the base 1 and the plate-like growth body 3. With this protective reef, the tidal current enters and rises through the window 7 as well as through the window 5 provided at the bottom of the base 1.

Therefore, compared to the protective reef shown in Figure 1, the formation of tidal currents is promoted, and along with this, eddy currents occur, which promotes the growth of food organisms, the collection of insects, and the proliferation of algae, resulting in a favorable environment. It becomes a fish reef.

In addition, in the protective reefs shown in Figures 1 and 2, the base 1 is made of a flat piece, and this base 1
At least four corners of the support portion 4 are supported by the support portion 4 as described above. Therefore, even if the seabed is uneven, it can be firmly installed by the support part 4, and even if there is a strong ocean current, it will not blow through the windows 5, 7 and the mesh, thereby preventing it from being washed away. In addition, because the mesh of the plate-like growth body 3 and the windows 5, 7, etc., allow for extremely good water flow, even when installed on the seabed,
Sand and the like are not stopped there, and the effects of so-called drifting sand are completely eliminated.

Furthermore, when the structure is as shown in FIGS. 1 and 2, a lid member 8 can be attached as shown in FIG. have

<Effects of the invention> As explained in detail above, in the protective reef 2 according to the present invention, plate-like growth bodies having mesh fiber bodies are inserted between the pillars protruding from the surface of the base, and these A predetermined space is surrounded by the proliferating body, at least one penetrating portion is formed in the base, and the base is floated above the support portion to form a window portion between the support portions.

Therefore, each member can be assembled freely, has excellent portability, and has no problem in terms of strength.

In addition, the entire interior space is exposed through the mesh, allowing water to pass through and creating eddy currents.
Accelerates the collection and reproduction of food organisms, and they become attached within two months after installation. Furthermore, although the proportions of mysids, lobsters, crustacean larvae, and polychaetes, which are the main feeding organisms, differ depending on the sea area, they can collect and reproduce in far greater numbers than on conventional fish reefs. Because there is tidal flow, there is little impact from drifting sand. Furthermore, since it is designed to minimize the incidence of light from above as well as the shaded areas from the sides, it can be sufficiently protected from natural enemies. Also, if the base is made of a flat piece,
Since the support part is attached, it can prevent sliding on sandy beaches.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a protective reef according to one embodiment of the present invention, and FIGS. 2 and 3 are perspective views of protective reefs according to other embodiments, respectively. Code, 1... Base, 2... Strut, 3... Platy growth body, 3a... Frame body, 3b... Fibrous body, 4... Support part, 5, 7... Window part, 6... Space, 8...lid member.

Claims (1)

[Scope of utility model registration request] Inserting a plate-like growth body having a mesh fibrous body between a plurality of pillars protruding from the surface of the base,
A predetermined space is surrounded by these plate-like growth bodies, at least one penetration part is formed in the base, a support part is attached to the bottom surface of the base, and the penetration part and the space are further provided between these support parts. A reef for protecting fish and shellfish in Thailand, etc., characterized by having a window communicating with the reef.