JPH047738Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Purpose of the invention> Industrial application field This invention relates to a reef protecting fish and shellfish such as red sea bream, and more specifically refers to fish, crustaceans, shellfish, and other fish and shellfish (hereinafter simply referred to as fish and shellfish). etc.), for example,
It is suitable for the spawning of expensive sea bream such as red sea bream, the protection and nurturing of young, immature, and adult fish, and the cultivation of seaweed beds, and it brings closer the natural enemies of sea bream such as sea bream, black sea carp, rockfish, etc. This relates to protected reefs that can be protected without any damage and that can support the growth of food organisms and algae for sea breams.

BACKGROUND ART In general, so-called artificial reefs are actively installed in the sea to create fishing grounds in place of natural fish reefs for the purpose of catching seafood and the like. These artificial reefs are used exclusively to collect mature fish and shellfish to form fishing grounds with high fishing efficiency, and are called fish collection reefs. These fishing reefs started using 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 addition, due to the abnormal depletion of marine resources, protective reefs have been proposed and implemented that do not only collect fish and shellfish, but also artificially attach and hatch eggs of fish and shellfish, and protect and nurture young fish. There is.

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

However, conventional fish reefs are unsuitable for protecting and growing red sea bream and the like, regardless of whether they are used for collecting fish or for protection. On the other hand, if conventional fish reefs are used as they are, young red sea bream and other young fish will be preyed upon by horse mackerel, rockfish, and the like, 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 on at least a part of the strand etc. so as to protrude from the strand etc.

With this rod-shaped fish reef, the shaded area formed between each fiber body protects spawning and young fish from external enemies and allows them to rest and live continuously, so it actively forms the shaded area. It is.

In addition, the fish reef described in Utility Model Application Publication No. 57-201163 consists of a truncated cone-shaped or truncated pyramid-shaped concrete base and a flocked board attached to this surface, and the surface of the flocked board is made of fibers. It is made by planting hair. In this fish reef as well, many shaded areas suitable for raising young fish and the like are formed on the surface of the flocked board.

However, all of these fish reefs actively form shaded areas, and due to the presence of these shaded areas, horse mackerel and other natural enemies approach, and as described below,
Young red sea bream and other young fish are preyed upon, making it unsuitable for protecting and raising them.

Problems to be solved by the invention This invention aims to solve the above-mentioned drawbacks, and specifically, unlike conventional fish reefs, it actively generates current passage and eddy currents while avoiding the formation of shaded areas. At the same time, we propose a protective reef suitable for raising red sea bream and other major food organisms such as mysids, green shrimp, polychaetes, and algae.

<Structure of the invention> Means for solving the problems and their effects In other words, the protective reef according to the invention is constructed by assembling plate-like growth bodies made of fibrous bodies arranged in a mesh shape into a truncated cone shape with a hollow interior. In addition, this hollow truncated cone is arranged on a base having at least one penetration part, and a support part is attached to the bottom of this base, so that the base is floated above the seabed surface. .

To explain in more detail, prior to constructing the above-mentioned protective reef, the present inventor focused on the fact that red sea bream behave differently from other fish and shellfish, and after studying their behavior, obtained the following knowledge.

First, looking at young red sea bream, young red sea bream have a habit of gathering on fish reefs. However, unlike other seafood, young red sea bream live inside the reef.
It does not enter the shaded area but is distributed around the area. Also, during the day they are distributed around fish reefs, but at night they leave the reef and rest in depressions on the sea floor nearby. In other words, it is said that the natural enemies of young red sea bream are horse mackerel, black carp, rockfish, etc. This fish has a strong fish reef habit, and enters the shaded part of the reef, where it
It often preys on young red sea bream. For this reason,
The home range of young red sea bream is narrow, and they migrate around fish reefs, but rarely go inside them.

Next, when looking at adult and immature fish, their home ranges are related to water temperature and 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. In addition, both adult and immature red sea bream are reef-like and are distributed within 200 meters around the reef, and will immediately evacuate when predators approach. ing. Furthermore, although they actively feed around fish reefs, they do not enter the interior of the reef, instead using the depressions on the sea floor around the reef as a "hiding place."

In short, a protective reef for red sea bream and other fish is constructed with a structure that does not attract horse mackerel and other natural enemies of the young fish, in other words, a structure that has no shaded areas and allows for good current passage and the formation of eddies. In conjunction with this, it is possible to create uneven areas such as sand ripples and scouring that become "hiding places" around the fish reef, and to create a structure where food organisms for adult and immature fish breed and gather. It becomes necessary.

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.

In addition, FIG. 1 is a perspective view of a protective reef according to one embodiment of the present invention, FIG. 2 is a perspective view of a protective reef according to another embodiment, and FIG. 3 is a perspective view of a protective reef according to another embodiment of the present invention. FIG. 2 is a plan view of a protective reef.

First, in FIG. 1, the reference numeral 10 generally indicates a hollow truncated cone, and 20 indicates a base, and the protective reef according to the present invention is constructed by disposing the truncated cone 10 on the base 20. There is. The truncated cone 10 is constructed by combining a plurality of plate-like growth bodies 11 into a truncated cone shape. Each plate-like growth body 11 consists of a frame 12 and a fibrous body 13, and each fibrous body 13 is usually made of, for example, nylon or other material. It consists of filaments of synthetic resin, and these filaments are combined in a network. Furthermore, the frame 12 does not necessarily have to be configured as a part of the plate-like growth body 11, but can also be configured in the shape of a truncated cone, and the fibrous body 13 can be stretched within this frame 12. The frame body 12 is made of a material having corrosion resistance and strength, and is generally made of FRP or steel material (corrosion-proof treated).

Next, the base 20 is made of, for example, concrete or synthetic resin in the shape of a flat plate, and at least one penetrating portion 21 is formed in the base 20 . Furthermore, support parts 22 are attached to at least four corners of the bottom surface of the base 20, so that the base 20 floats above the seabed when installed on the seabed.

That is, when the truncated cone 10 is constructed by combining the plate-like growth bodies 11 formed by arranging the fibrous bodies 13 in a mesh shape, the truncated cone 10 is formed through the mesh of these fibrous bodies 13.
The entire interior of the is exposed, and no shaded areas are formed inside. Therefore, red sea bream and the like enter the interior of the fiber body 13, eat food organisms and algae attached to the fiber body 13, and grow healthy. Furthermore, a penetrating portion 21 is formed in the center of the base 20, and the bottom surface of the base 20 rises from the seabed, and a window portion 23 is formed between the supporting portions 22 attached to each corner. Ru. For this reason, seawater enters through these windows 23, rises through the penetrations as a tidal current, and this tidal current flows through the network of the plate-like growths. Therefore, food organisms and algae attached to each fiber body 13 receive this current, and natural light can be absorbed, providing a good breeding place for red sea bream. In this case, even if a natural enemy such as a sea bream approaches, there is no shaded part formed inside the cone or at the bottom of the base, so these fish rarely approach due to their habits, and the red sea bream and other fish are protected from their natural enemies. It can be grown in any condition.

Since there is no place for red sea bream and the like to hide on the reef, it is sufficient to form a separate depression in the seabed around the reef.

In addition, as shown in FIG. 1, the truncated cone 10 is
Instead of being directly attached to the surface of the base 20, the truncated cone 10 can be made to float above the surface of the base 20 and the window 14 can be formed between them, as shown in FIG.

That is, the protective reef shown in FIG. 2 has a window 14 also provided between the base 20 and the truncated cone 10. With this protective reef, tidal currents enter from this window 14 as well as through the window 23 provided at the bottom of the base 20 (note that even with the protective reef shown in As shown in FIG. 3, a penetrating portion 21 is formed approximately in the center of 20.

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.

Furthermore, in the protective reefs shown in FIGS. 1 and 2, the base 20 is constructed of a flat piece, and at least four corners of the base 20 are supported by the support portions 22 as described above. Therefore, even if the seabed is uneven, the support part 22 allows for secure installation, and even if there is a strong ocean current, the window parts 14 and 23, and
It blows through the mesh, which prevents it from being washed away. In addition, the plate-like growth bodies 11, windows 14, 23, etc. allow for extremely good water passage, so even if it is installed on the seabed, sand, etc. will not be trapped there, and the effects of so-called sand drift will be avoided. It completely disappears.

<Effects of the invention> As explained in detail above, the protective reef according to the invention combines plate-like growths made of fibers arranged in a mesh pattern into a truncated cone shape with a hollow interior. is arranged on a base having at least one penetration part, and a support part is attached to the bottom of the base,
The base is made to float above the seabed surface, and a window is formed at least on the bottom side of the base.

Therefore, since the inside of the truncated cone is hollow and the sides are mesh-like, it provides water passage and generates eddy currents, accelerating the collection and reproduction of food organisms, and they become attached within two months after installation. Furthermore, the main feeding organisms, such as mysids, lobsters, crustacean larvae, and polychaetes, congregate and reproduce in far greater numbers than on conventional fish reefs, although their respective ratios vary depending on the sea area. 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. Furthermore, since the base is made of a flat piece and has a support section attached, it is possible to prevent it from sliding on a sandy beach.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a protective reef according to one embodiment of the present invention, Figure 2 is a perspective view of a protective reef according to another embodiment, and Figure 3 is a plan view of the protective reef shown in Figure 2. be. Symbols, 10... Hollow cone truncated, 11... Platy growth body, 12... Frame body, 13... Fibrous body, 20... Base, 21... Penetration part, 22... Support part, 23...
Window section.

Claims (1)

[Scope of utility model registration request] Plate-like growth bodies formed by arranging fibrous bodies in a mesh pattern are combined into a truncated cone shape having a hollow interior, and this hollow truncated cone is arranged on a base having at least one penetrating portion, and this base A reef for protecting fish and shellfish such as red sea bream, characterized in that a supporting part is attached to the bottom of the reef, and the base is raised above the seabed.