JPH025727Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a seaweed reef that is used to grow and multiply seaweed to create a seaweed bed.

In recent years, especially in Japan, there has been a need to shift from fishing for catching to fishing for growing fish, in order to deal with issues such as regulation of the 200 nautical mile exclusive economic zone or deep-sea fishing, and a decline in fish and shellfish stocks. projects and marine area comprehensive development projects are being implemented.

Seaweed beds are most important when propagating sessile fish and shellfish in the shallow waters of Isone fishing grounds. Seaweed beds play an important role in increasing the number of food organisms on the seabed, providing food for algae-eating fish and shellfish, and at the same time providing protection and habitat for young children. The Isoyaki phenomenon has occurred, causing trouble for those involved in the fishing industry.

At present, cultivation techniques for edible seaweed such as Asakusanori, wakame, and kelp have been established, and cultivated seaweed is being supplied to the market. On the other hand, the technology for propagating useful seaweed necessary for the propagation of fish and shellfish is still at the research and development stage, and there have been no cases where a seaweed bed has been created over a wide area by artificially transplanting the intended useful seaweed. However, attempts and experiments are currently being carried out to create such seaweed beds.

The first method is to put substrates such as broken stones, concrete blocks, and synthetic resins on which seaweed spores (zoospores) can easily attach to the ocean floor. This method is the most commonly used basic method, but it requires waiting for natural seedling collection under the sea, making it difficult to grow the desired seaweed in a short period of time.

Secondly, in order to encourage the settlement of target seaweed spores and to adjust the water depth to the appropriate water depth for the growth of seaweed, we have developed a method of blasting the seafloor bedrock with dynamite, and a method of blasting seabed rock with shallow water depth and wide bedrock zones. A method is being used to create kelp beds by creating groves to deepen the water depth and at the same time create a flow of seawater.

The third method is to rope mother algae collected from other sea areas onto a new substrate installed in the sea area where a seaweed bed is to be created, or onto rock where reef blasting has been performed.
This is a method of installation using bags, weights, etc. Although this method is reported to be somewhat effective, the spores' attachment and growth depend on the forces of nature, and this method has not yet been established as a reliable technique.

The fourth method is transplantation of cultured seedlings. That is, spores are extracted from mother algae on land, grown on a substrate, and then artificially cultured to grow into young buds, which are then transplanted to actual seawater. The creation of seaweed beds using this method is currently in the experimental stage, and the technology has not yet been established. Furthermore, the work of transplanting cultured seaweed seedlings to actual sea areas where seaweed beds are to be created requires much more labor and expense than transplanting plants on land. Furthermore, such underwater work must rely on expert divers, and the number of such personnel is limited, which also poses a major problem.

As described above, although the creation of seaweed beds is necessary, it remains at the experimental stage, and the establishment of practical technology is desired.

The purpose of this invention is to solve the above problems and provide a seaweed reef that enables efficient and economical creation of seaweed beds.

The algae reef created by this invention consists of a cage-shaped or box-shaped main body with an open top and sunk to the seabed, and a plate that is fixed horizontally or diagonally to the main body and has a substrate on which seaweed sprouts are attached to the top surface. It consists of a removable bud protection cage that is open at the bottom and covers the top of the plate.

The type of seaweed can be selected arbitrarily depending on the purpose, but examples of seaweed useful for the proliferation of fish and shellfish include eelgrass, which is a marine flowering plant (eelgrass bed), and dendritic brown algae such as Sargassum (eelgrass bed). There are kelp species such as Garamoba), Kajime, Kurome, and Arame.

A seaweed reef is placed on the ocean floor with broken stones placed inside its body. Then, when a seaweed reef is installed on the ocean floor,
The buds of seaweed that have settled on the substrate on the plate grow sufficiently and become adults, scattering spores into the surrounding area, which then attach to seabed rocks and germinate, gradually forming a seaweed bed.

According to this invention, the sprouts of seaweed that have grown on the substrate can be attached to a plate, and this plate can be attached to the body of the algae reef on land or on a ship, where it is easy to work, and then sunk to the seabed. Compared to transplanting seaweed seedlings that have grown on the seaweed into the sea,
The labor and expense required for the work are extremely low,
Economical. In addition, a removable bud protection cage is provided, which protects the buds from damage caused by algae-eating fish and shellfish and allows them to grow reliably.When the seaweed has grown to a certain extent, the protection cage can be removed. It can improve the gathering of seafood. Furthermore, since the main body has a cage or box shape with an open top, heavy objects such as broken stones can be placed inside to prevent the algae reef from moving due to waves, currents, etc. Therefore, by using the seaweed reef according to this invention, the intended useful seaweed can be reliably grown and multiplied, and a seaweed bed can be created efficiently and economically.

Embodiments of this invention will be described below with reference to the drawings.

Figures 1 to 3 show the seabed 1 to create a seaweed bed.
This seaweed reef has a rectangular cage-shaped steel body 2 that is open at the top and is sunk to the seabed, and a seaweed reef that is fixed diagonally to the top of the body 2. The tree consists of two rectangular plastic planting plates 5 to which a substrate 4 with seedlings 3 attached is attached to the upper surface, and a removable rectangular seedling protection basket 6 having an open bottom and covering the upper part of the plates 5.

The main body 2 includes a frame 8 formed by welding a plurality of angle-shaped members 7 and having an oblique upper end;
A coarse mesh expanded metal 9 is attached to the inside of the frame 8 so as to cover the bottom and all sides, and a fine mesh (netron sheet) is attached to the inside of the expanded metal 9 to cover the expanded metal 9. )10. Plate mounting plates 11 are diagonally fixed to the upper inner surface of the tallest part and the upper inner surface of the shortest part of the frame 8, and a plurality of plate mounting bolts 12 are installed on the upper surface of each plate 11. Fixed vertically. Both ends of the two plates 5 are fixed to the mounting plate 11 by these bolts 12 and nuts 13.
Further, hanging pieces 14 are fixed to each of the four corners of the upper surface of the frame 8. Note that a large number of broken stones 15 are placed inside the main body 2 to prevent the algae reef from moving due to waves, currents, etc.

The protective cage 6 includes a frame body 17 constructed by welding a plurality of steel round bars 16, and a fine mesh (netron net) attached to the frame body 17 so as to cover the top surface and all sides of the frame body 17. sheet) consists of 18 sheets. The protective basket 6 is placed diagonally on the frame 8 of the main body 2, and although not shown, the protective basket 6
A round bar 16 at the lower end of the frame 17 is fixed with a wire to the upper surface of the chevron 7 disposed around the entire upper end of the frame 8 of the main body 2.

The above-mentioned seaweed reef is installed on the seabed in the actual sea area where seaweed bed creation is to be attempted in the following manner.

First, a substrate made of a plate-shaped sponge measuring, for example, 520 mm in length and 450 mm in width is attached to one side of a plastic plate of the same size, and spores collected from the mother algae of useful seaweed are placed on this substrate in a building on land. Let it take root. Then, this substrate is placed in an aquarium inside a building or outdoors, and the environmental conditions necessary for spore growth, such as temperature, illuminance and sunshine duration, and nutrient salts, are adjusted to allow the spores to germinate, and to form young shoots (3 Grow to about 10 cm). The seedlings that are artificially grown and cultured on the substrate in this way are weakly rooted in the substrate, and if they are released into the actual sea area as they are, there is a risk that they will fall off the substrate due to waves and currents. Select a calm place near the coast and suspend the plastic board with the substrate attached 1 to 2 meters below the sea surface for about two months to strengthen the rooting of the young shoots. The above seedling culturing method is the same as the conventional method.

Next, cut this substrate to, for example, 130 mm in length and width.
Divide into multiple relatively small substrates 4 of about 75 mm. Then, on the upper surface of the plate 5 that has been removed from the main body 2 of the algae reef, an adhesive-cum-algae thickening coating agent 19 containing nutrients necessary for the growth of the young buds 3 is uniformly applied and divided as described above. The seedlings 3 that have grown on these substrates are attached to the plate 5 by gluing the substrate 4 on which they have been prepared.

Next, on land or on a ship, a split stone 15 is put into the main body 2 from which the protective cage 6 has been removed, and the plate 5 with the young buds 3 attached is fixed to the main body 2. Then, the protective basket 6 is placed over the top of the main body 2 and fixed.

Finally, a wire rope or the like is attached to the hanging piece 14 of the main body 2, and the algae reef is suspended and installed from the ship to the seabed 1. At this time, the upper surface of the plate 5 to which the young shoots 3 are attached is made to face the direction in which the waves come.
In this way, the horizontal movement force due to wave force can be reduced.

When the algae reef is installed on the seabed 1 in this way,
The seaweed sprouts 3 that have settled on the substrate 4 on the plate 5 grow sufficiently and eventually become adults. At this time, the protective cage 6 and the net 10 of the main body 2 can prevent the algae-eating fish and shellfish from entering the algae reef, so the young buds 3 are protected from the damage caused by the algae-eating fish and shellfish, and their growth is ensured. can be done. When the sprouts 3 grow to a size (approximately 30 to 40 cm) that allows them to continue growing without being destroyed even if they are damaged by algae-eating fish and shellfish, the protective cage 6 is removed from the main body 2 and removed. do. In this way, for example, lobsters, abalone, etc. can enter the algae reef, and the algae reef also functions as a so-called fish reef.

In addition, spores are released from the seaweed when the young buds 3 grow and become adults, and the spores attach to the surrounding seabed rocks and germinate, gradually forming a seaweed bed. In this way, algae reefs grow seaweed and serve as the core of creating seaweed beds, so if necessary, new substrates on which spores can easily attach, such as rocks or concrete blocks, should be introduced around the algae reefs. and improve the environmental conditions to facilitate the formation of seaweed beds.

Figures 4 and 5 show algae reefs different from those described above.

The main body 20 of the seaweed reef is formed into a rectangular parallelepiped box shape with an open top by a horizontal bottom plate 21, four vertical side plates 22, and a plurality of chevron members 23 that are welded to each other. A chevron member 23 is horizontally fixed to the inner surface of the upper end of each of the two opposing side plates 22, and both ends of the two horizontally arranged plates 5 are fixed to these chevron members 23 in the same way as above. There is. Further, the young bud protection basket 24 is composed of a frame body 25 and a net 26 as described above. The lower end of the protective basket 24 is fitted onto the outside of the upper end of the main body 20 from above, and although not shown, a round bar 27 horizontally arranged around the entire lower end of the frame 25 is connected to the main body by a wire. It is fixed to the upper outer surface of the side plate 22 of 20. The rest is the same as in the above embodiment, and the same parts are given the same reference numerals.

The algae reef main body may be a cage-shaped or box-shaped structure with an open top so that heavy objects such as broken stones can be put therein, and its shape is not limited to that of the above embodiments.

The substrate on which the seaweed seedlings are attached can be made of any material, and in addition to sponge, polyvinyl alcohol synthetic fibers, plastic plates, tubes, etc. may be used. The material of the plate on which the substrate is attached is also
It can be changed as appropriate. The attachment of the substrate to the plate is not limited to using the algae-enhancing coating agent as in the above embodiments, but may also be done using, for example, a general adhesive or wire. The attachment of the plate to the algal reef body is also optional, and may be done with wire, for example.

The attachment of the sprout protection cage to the algae reef body is also optional, and may be done with bolts, for example. Further, the sprout protection basket may be of any type as long as it can cover the upper part of the sprouts attached to the plate and protect them from damage caused by algae-eating fish and shellfish, and its structure is not limited to that of the above embodiment.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention,
Figure 1 is a partially cutaway plan view, Figure 2 is Figure 1-
3 is an enlarged sectional view of the line shown in FIG. 1, FIGS. 4 and 5 show other embodiments of the invention, and FIG. is a sectional view taken along the line of FIG. 4; 1... Seabed, 2, 20... Main body, 3... Seaweed bud, 4... Substrate, 5... Plate, 6, 24...
...Baby bud protection basket.

Claims (1)

[Scope of utility model registration request] A cage-shaped or box-shaped main body 2 with an open top and installed submerged in the seabed 1, and a plate 5 fixed to the main body 2 horizontally or diagonally and having a substrate 4 on which seaweed sprouts 3 are attached to the upper surface. , an algae reef consisting of a removable bud protection cage 6 which is open at the bottom and covers the upper part of the plate 5.