JPS6217488B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an artificial floating fish reef that is easy to transport and transport to the installation sea area, has good assembly and workability, and allows seaweed to adhere and propagate in a short period of time to form a natural fish reef. .

Traditionally, fish aquaculture has been widely carried out in many sea areas in order to cope with the depletion of fish and marine product resources due to overfishing. Fish reefs are attracting attention,
Many proposals have been made. Among these artificial reefs, submerged artificial reefs, such as large hollow concrete blocks or steel blocks built underwater, and ones made by sinking industrial waste such as abandoned ships and buses to the seabed, are used as swimming layers for schools of fish. It is difficult to limit the habitat of fish and fishes to the seabed, and it is difficult to plan for the migratory growth of fish in the surface and middle layers of the sea, and when installing them, there is a problem in that a great deal of labor is required for transportation, transportation, and installation work. On the other hand, there are floating fish reefs for the purpose of cultivating fish not only on the seabed but also on the surface and mid-sea floor. A floating fish reef is disclosed in 1965-39665, in which a tape-like object or rope-like object is attached to a tape holder. However, these cannot be said to be sufficient in terms of their function as fish reefs, durability, and handling workability.

Fish attracting functions of fish reefs include shading effect by creating appropriate shaded areas for fish, feeding effect that attracts fish in search of plankton and nutritional salts that collect on and around the reef itself, and reef structures that disturb tidal currents. It is necessary to have an abundance of nutritional salts, a vortex effect caused by the sound generated when the current hits a structure, and an escape effect that provides a place for small fish to escape.

The present inventors have made extensive studies on floating fish reef units and floating fish reefs that have improved the drawbacks of conventional artificial reefs, have excellent durability and workability, and have excellent fish-attracting effects, and have discovered the present invention.

That is, the present invention comprises at least two frames in which at least three plastic rod-shaped supports are fixed by plastic floating bodies having a specific gravity of less than 1.0, which are provided with a fixing mechanism for the rod-shaped supports, and a net-like material and/or
Or it relates to a floating fish reef formed by fixing floating fish reef units connected by ropes with mooring ropes and anchors.

Hereinafter, the present invention will be explained specifically and in detail based on the drawings. FIG. 1 is a perspective view showing one example of the floating fish reef of the present invention, and the floating fish reef consists of two frames in which three plastic rod-shaped supports 1 are fixed by plastic floating bodies 2 having a specific gravity of less than 1.0. This is a floating fish reef in which a net 4 and a rope 5 are attached to a net 3 and a frame 3 is connected to each other, and when the floating fish reef is installed in the sea, it can be attached to any floating body by a rope 6 on the top as shown in the figure. A marker buoy 9 is attached via a rope 8, and the lower part is moored and fixed with an anchor 7 using a rope 6.

The floating fish reef unit of the present invention and the plastic floating bodies constituting the floating fish reef are plastic molded products having a fixing mechanism for integrally fixing the rod-shaped support to which the net-like object is attached, and having a specific gravity of less than 1.0, as described below. It is necessary that The specific gravity of this plastic floating body allows the floating body to float in water, and it is not only designed to have buoyancy to float the floating fish reef at a desired depth, but also to prevent seaweed from attaching when the floating fish reef is installed stably over a long period of time. This is important from the viewpoint of reducing the buoyancy caused by shellfish and the durability of the floating body itself, and preferably the floating body has closed cells or hollow pores with an apparent specific gravity of 0.3 to 0.6. Examples of plastics include polyolefins such as polyethylene and polypropylene, polyamides, and ABS resins. In addition, the rod-like supports fixed by the floating body and forming the frame include flexible rod-like and cylindrical bodies made of synthetic resin in various shapes such as circles and corners, and these are made of glass fiber,
It may be reinforced with reinforcing fibers such as carbon fibers. Both ends of this rod-shaped support may be attached with devices for fixing it to the floating body, but in order not to impede its function as a floating fish reef, it is preferable that it is cylindrical, lightweight, and strong. When the rod-shaped support is a cylindrical body, the interior thereof can be filled with foamed polyolefin having a lower specific gravity, or gas can be enclosed to make it lighter and heavier and increase buoyancy. Plastics constituting such a rod-shaped support include the aforementioned polyethylene, polypropylene, polyamide, and the like.

Examples of the net-like material include various net materials conventionally used as fishing nets, knitted fabrics, belts, net-like materials made from non-woven fabrics, and film-like materials. When using a non-woven fabric or film-like material, it is preferable to reinforce it with a high-strength filament such as polyamide or polyester. More preferably, it is made of a hydrophilic material to which nutrients and seaweed easily adhere and are difficult to fall off, and has a fine uneven structure on its surface, such as twisted yarn or knitted fabric, especially polyamide, which has high mechanical strength and excellent durability. It is best to use synthetic fiber material.
This net-like material not only blocks light rays on the fish reef of the present invention, forms a shadow area in the sea, and provides a fish-collecting function, but also allows seaweed etc. to attach and grow in a short period of time, making the fish reef natural. Reduce the resistance of the reef itself to external forces such as tidal currents. From this point of view, the size of the net-like material is 30 to 300 m2 ^.
In the case of net fabric, it is best to use twine netting with a thickness of 30,000 to 150,000 denier with a mesh size of 20 to 60 cm. Furthermore, the netting should be installed so that it weighs 5 to 15% in air per weight of the floating fish reef unit; outside this range, the shaded area as a fish reef may not be sufficient, and the floating fish reef may not be as buoyant. This is not desirable as it may interfere with

Next, the method of fixing and attaching the plastic floating body, the rod-shaped support body, and the net-like body to each other will be described in detail.

As for the fixing mechanism of the rod-shaped support provided on the plastic floating body, it is sufficient that the rod-shaped support can be easily attached and fixed and is preferably removable. Although it can be used, a clamping type is preferable.

FIG. 2 is a perspective view showing an example of a floating body equipped with such a clamping type fixing mechanism. Two cylindrical molded products are stacked on each other with the grooves 10 corresponding to each other, and four holes 11 are provided for inserting a rod-shaped support into the grooves 10 and fixing them together. It is. This clamping type floating body is placed in the groove 10.
The support can be more firmly fixed by placing rubber packing such as SBR or NBR. Further, when the support body has a circular cross section, the groove portion 10 is formed into a semicircular shape. Although FIG. 2 shows an example in which the grooves 10 are provided with four grooves intersecting each other at right angles, a larger number of grooves may be provided depending on the number of fixed rod-shaped supports. However, if the area of the rod-shaped support fixing portion of the floating body, that is, the groove portion, becomes too large, the rod-shaped support will not be sufficiently fixed, and the durability as a floating fish reef will be lost, which is not preferable. Therefore,
The support fixing area (groove surface area) of the floating body is at least 1.5 of the surface area of the rod-shaped support that fits into this groove.
It is better to double the setting. In other words, the length of the support fixing groove of the floating body is at least the diameter of the rod-shaped support.
It should be 1.5 times. Furthermore, FIG. 3 shows an example of another floating body constituting the floating fish reef unit or floating fish reef of the present invention, which has an external shape with an angle θ of 90° or less, preferably 30 to 60°, and has a support attached to it. The structure is provided with fixing holes 12, and a floating fish reef unit using this floating body has low resistance to tidal currents, and the floating fish reef has excellent stability in the sea.

Further, it is preferable that the frame consisting of the rod-shaped support and the floating body be provided with a fitting for connecting the frames with a rope or other connecting device and for attaching a net-like object.

The floating fish reef unit of the present invention having the above-mentioned configuration has the basic structure shown in FIG. 1, which functions as a floating fish reef by installing a plurality of them in the sea, but more preferably It is preferable to connect and assemble the floating fish reef unit to the structure shown in FIGS. 4 and 5.

Figures 4 and 5 show an example of a preferred assembly structure of a floating reef according to the present invention, in which a floating reef unit consisting of a rod-shaped support 1, a floating body 2, and a net 4 is assembled using the rod-shaped support 1 or a rope 5. FIG.

FIG. 4 shows an N type with a trihedral shape, and FIG. 5 shows a W type with a tetrahedral shape. By integrating a plurality of units in this manner, the floating fish reef becomes three-dimensional, increasing its volumetric efficiency, and increasing its shading effect and effect as an escape place. The function as a fish reef (shading, eddy current effect) can be achieved by extending another net, such as a highly strong net with a mesh size of 60 cm or more, in the lower space (the part where the net is not stretched). It is also possible to increase the height and use it to strengthen the reef itself.
Furthermore, small fish can be helped to escape by making the size of the mesh larger on the outside facing side and smaller on the inside side.

Furthermore, by vertically connecting the floating fish reef in multiple stages with rope-like objects, the floating fish reef according to the present invention is made three-dimensional, the shading effect is increased, and the function as a fish reef is improved.

As described above, by combining various floating fish reef units according to the present invention, it is possible to respond to changes in marine environmental conditions and target fish species, and to fully exhibit its function as a fish reef. In addition, plastic materials
Because it uses thermoplastic synthetic fibers, it has excellent seawater resistance and durability, and is lightweight, making it easy to assemble and process.
It has features such as excellent construction properties and can be fully effective as a floating fish reef.

The following example will be described.

Example 1 A plastic fixture shown in FIG. 2 was molded from polyethylene. The basic shape of the plastic fixture is circular, with an outer diameter of 60 cm and an inner diameter of 35 cm.
cm, thickness 10cm, weight 8.9Kg, apparent specific gravity.
It was 0.92. Further, the groove part was formed into a semicircular shape to fit the rod-shaped support having an outer diameter of 168 mm, and its diameter was 172 mm, which was 4 mm larger than the rod-shaped support. Further, the intersection angle between the grooves was set to 60 degrees. The rod-shaped support used was an existing polyethylene pipe with an outer diameter of 168 mm, an inner diameter of 150 mm, and a length of 5 m. The weight of the pipe was 20.7Kg. Furthermore, polyethylene foam with an expansion ratio of 30 times was inserted into the internal space of the pipe. The buoyancy of the foam was 88Kg. The net material was made of polyamide synthetic fiber, and a twine of about 100,000 d was made, and a frogmata knotted net with a mesh size of 30 cm was made from the twine. Furthermore, the mesh of this mesh was expanded to form a nearly square mesh to form a mesh of 5 m x 10 m, and the outer periphery of the mesh was fixed and reinforced with a mesh reinforcing rope made of a polyamide material with a diameter of 7 mm to form a mesh. did. The weight of this net was 10.5Kg.

As shown in Figure 1, the rod-shaped support is clamped at both ends using plastic fixtures, and a 3 mm thick plastic fixture is used at the fixed part to prevent the rod-shaped support from coming off and to improve impact resistance at the fixed part. A triangular frame was created by attaching rubber packing with good seawater and weather resistance and firmly fixing it with bolts and nuts. The upper frame and the lower frame were connected and fixed using a frame connecting rope made of a polyamide material with a diameter of 30 mm. The connection was made using a metal ring pre-attached to a plastic fixture. The net-like material is attached to a frame made of a polyamide rope that fixes the frames formed in this manner. The attachment method was to create a floating fish reef by binding and fixing the net reinforcing rope of the net, the frame body, and the frame connection rope using a binding rope made of polyamide material with a diameter of 10 mm. As shown in Figure 1, the resulting pelagic reef was constructed using a plastic marker buoy and a polyamide-based material with a diameter of 50 mm.
The system was secured using a mooring rope and a 5-ton concrete anchor block. The water depth at the installation location is
100m, and the depth of the floating fish reef body from the water surface was approximately 20m. The floating fish reef according to the present invention had a surplus buoyancy of about 500 kg at the time of installation, and had good shape stability underwater at the time of installation. The weight of the net material accounted for 8.3% of the total aerial weight of the floating fish reef, which caused a turbulent flow against the tidal current and had a sufficient shading effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the basic structure of the floating fish reef of the present invention, and FIG. 2 is a perspective view of a floating body equipped with a fixing mechanism for a rod-shaped support constituting the floating fish reef unit of the present invention.
FIG. 3 is a perspective view showing another aspect of the floating body, and FIGS. 4 and 5 are perspective views showing one example of a preferable assembly structure of the floating fish reef according to the present invention. 1: Rod-shaped support, 2: Floating body, 3: Frame, 4: Net fabric, 5, 6: Rope, 7: Anchor, 8: Floating body,
9: Sign buoy, 10: Groove, 11: Hole, 12:
mounting hole.

Claims (1)

[Claims] 1. A floating fish reef consisting of at least two frames in which at least three plastic rod-shaped supports are fixed by a plastic floating body with a specific gravity of less than 1.0, which is equipped with a fixing mechanism for the rod-shaped supports, and connected by a net and/or rope. A floating reef where units are fixed with mooring ropes and anchors.