JPH07255317A - Method for creation of marine ranch and block therefor - Google Patents

Abstract

PURPOSE:To provide the subject method intended to raise shellfish or small fish by creating a habitat suitable for them at the shallow-sea bottom with abundant large stones where such a marine ranch has been hard to create. CONSTITUTION:Triangular pyramidal blocks 1 each wrapped with a string 3 with sea algal seeds attached thereto are put among large stones at the sea bottom and set stably; then, sea algae grow thick from the strings, forming a space suitable for fish and shellfish inhabitation. The blocks can be sunk to the sea bottom by being carried by man.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a marine ranch in a shallow sea where the geology of the seabed is unsuitable for habitat of seaweed, for example, the seabed of large natural stone and the water depth is about 5 m or less, and its method. Regarding the blocks used for creation.

[0002]

2. Description of the Related Art There is known a technique for breeding seafood by constructing an ocean ranch by providing an artificial reef on the seabed. In such a case, a fish reef is loaded and carried on a work boat, and it is submerged on the seabed to construct an ocean ranch. However, for example, in a shallow sea with a depth of about 5 m or less, the operation of the work boat is hindered, and under the geological conditions where large natural stones that are unsuitable for the growth of seaweeds are around the seabed, Creation is difficult.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for constructing a suitable marine ranch under such conditions and a block used for the construction.

[0004]

In order to solve the above-mentioned problems, the present invention is characterized by arranging a block entrained with seaweed seeds on the seabed to promote the growth of seaweeds. This is how to build a farm. In this case, it is preferable to entrain the seaweed seeds by winding the string-shaped body to which the seeds are attached around the block.

The block used for carrying out the above method is a block made of a triangular pyramid, and a groove for winding a cord is provided on the surface, and one surface of the triangular pyramid is used as the top surface, and a large number of the top surfaces are provided. A marine ranch construction block is preferable, which is characterized in that the projections and depressions are provided while the anchor bolts are projected at the base of the triangular pyramid. The unevenness provided on the top surface is suitable as a broom pattern, that is, a fine uneven pattern that can be formed when sweeping the surface of unconsolidated concrete with a broom vertically and horizontally because seaweed easily roots. Is. The block may be made of ordinary concrete, but it is more preferable if it is made of porous concrete or concrete containing iron powder or ferrite.

[0006]

The method of constructing an offshore farm according to the present invention is for constructing a farm by manpower in a shallow sea where a work boat cannot operate. For this reason, a string of seaweed seeds is wrapped around the triangular pyramid block, and the one side of the triangular pyramid faces up and the natural stone is placed between the stones on the seabed and arranged. However, it is intended to grow seaweed. The prosperous seaweed can create an environment suitable for the habitation of seafood.

The size of this block is such that the length of one side of the triangular pyramid is 30 to 40 cm and the weight is 10 to 30 kg, and it can be easily handled by manpower in the sea.
The string-like body may have any shape as long as it can be wound around the block, and the material is not limited. For example, fiber bundles made of natural fibers or artificial fibers, woven strings,
Use braid, rope, rope, tape, etc.

[0008] In the marine ranch constructed by the method of the present invention, seaweeds grow in shallow water and serve as food for seafood.

[0009]

EXAMPLE FIG. 6 shows a conceptual diagram of the method for constructing an ocean ranch of the present invention. The seaweed 13 does not flourish in the shallow water where the large stones 10 are scattered on the seabed 12. Also, work boat 1
It was difficult to build a marine ranch because 4 could not operate freely. In the present invention, the small block 1 is carried to the vicinity by the work boat, and the worker 15 lays it in the gap 11 of the large stone 10 on the seabed, and the seaweed 13 is made to grow in this block.

FIG. 1 is a plan view of a marine ranch construction block 1 according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a perspective view thereof. The block 1 of the present invention has a block shape of a triangular pyramid, and a groove 4 for winding a string 3 around the upper surface 2 and the side surface 5 of the triangular pyramid. A string to which seaweed seeds are attached is wound around the groove 3.

By making the block 1 of the present invention into a triangular pyramid shape, it can be easily inserted and installed between natural stones having a large seabed. Also, the stability after installation is good. If the block moves after installation, it adversely affects the growth of seaweed, but in the present invention, the block does not move, so there is no concern. In the installation of the block of the present invention, one surface of the triangular pyramid is installed so that the upper surface 2 is provided, so that the area where the seaweed grows can be wide.

As the string 3, a twisted string to which seaweed seeds are adhered and which is made by twisting vinyl chloride having a thickness of about 1 mm into a thickness of about 10 mm is used. The groove 4 for winding the string 3 was provided so that the string 3 could be wound around the side surface and the upper surface of the triangular pyramid, as shown in FIGS. The figure shows an example of that.
I made a big notch 7 so that the strings could gather there. The number, arrangement and size of the grooves 4 and the notches 7 are arbitrary and are not limited to those shown in FIGS.

If a corrugated pattern such as a broom pattern is provided on the upper surface 2 of the triangular pyramidal block 1, seaweed is more likely to grow. That is, it is preferable that the seaweeds grown from the string 3 adhere to the uneven surface of the block and easily grow, and the seaweeds easily grow on the surrounding natural stones. The hook 8 is provided at the lower end of the triangular pyramid. The hook 8 is used as a hanging hook when manufacturing or transporting the block 1.
Also, after the block 1 is installed on the seabed, the hook 8 acts as an anchor bolt to enter the seabed sand layer, contribute to the stability of the block, and prevent the block from moving, so that an environment suitable for the growth of seaweed can be created. Be useful.

FIG. 4 shows the block 1 of the embodiment as a large stone 1 on the sea floor.
FIG. 5 is a plan view of the step of arranging in the gap 11 of 0, and FIG. 5 is a side view showing a situation where the seaweed 13 has started to grow in the block 1. In FIG. 5, the hook 8 is an anchor bolt and the seabed 1
It also shows the situation where the stability of the block is secured by penetrating No. 2. The block 1 of the present invention may be made of ordinary concrete, but if it is made of porous concrete having a large porosity of about 10 to 30%, seaweed is likely to adhere to the surface of the porous concrete. It is possible to create an environment suitable for the growth of seaweed.

Also, when it is manufactured from concrete containing iron powder or ferrite, seaweed is likely to adhere to the surface, and an environment suitable for the growth of seaweed can be created. The iron powder or ferrite replaces a part of the fine aggregate, and may be 5% or more of the volume of the fine aggregate, and the entire amount may be replaced, but from the viewpoint of cost, the replacement amount is preferably 50% or less.

[0016]

EFFECTS OF THE INVENTION Since the method of constructing an ocean ranch of the present invention is constructed as described above, a diver dives into a shallow sea, which was difficult to construct in the past, and easily forms a suitable habitat for seafood. It contributes to the growth of shellfish such as abalone and turban and small fish. The block of the present invention can be held by a person and can be stably deposited on the seabed, and seaweed that has come out of the string can grow and form a suitable seafood habitat space.

[Brief description of drawings]

FIG. 1 is a plan view showing a block of an embodiment.

FIG. 2 is a side view of a block of the embodiment.

FIG. 3 is a side view of a block of the embodiment.

FIG. 4 is a plan view of Oishi.

FIG. 5 is a side view of Oishi.

FIG. 6 is a conceptual diagram of creating an ocean ranch.

[Explanation of symbols]

 1 Block 2 Top 3 String 4 Groove 5 Side 6 Side Ridge 7 Notch 8 Hook 10 Oishi 11 Gap 12 Seabed 13 Seaweed 14 Workboat 15 Worker 16 Sea Surface

Claims (5)

[Claims] 1. A method for constructing a marine ranch, which comprises arranging a block entrained with seaweed seeds on the seabed to promote the overgrowth of seaweeds. 2. The entrainment of the seaweed seed is to wind a string-shaped body to which the seed is attached around a block.
How to create the marine ranch described. 3. A block made of a triangular pyramid, wherein a groove for winding a string-like body is provided on the surface, and one surface of the triangular pyramid is used as a top surface, and a large number of irregularities are provided on the top surface. An ocean ranch construction block characterized by protruding anchor bolts at the base of the cone. 4. The marine ranch construction block according to claim 3, wherein the block is made of porous concrete. 5. The marine ranch construction block according to claim 3, wherein the block is made of concrete containing iron powder or ferrite powder.