JPH0332968B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention provides a system for crawling aquatic animals that prevents them from climbing up and over barriers and escaping out of enclosures at marine farms, etc. This invention relates to a movement prevention device.

``Conventional technology'' Conventionally, at marine farms and other facilities where aquatic animals are cultivated within the enclosures constructed with barriers in seawater, animals that crawl on the seabed, such as abalone and sea urchins, have been forced to climb over the barriers and migrate. Traditionally, when trying to prevent escape and restrain it on a specific seabed,
Consideration had been given to creating a structure in which the top of the barrier that would serve as an enclosure would protrude above the water surface, or by covering the top with netting to prevent people from climbing over the top of the barrier.

``Problems to be solved by the invention'' However, in the conventional method described above, where the upper end of the barrier is exposed above the water surface, it costs a lot of money to maintain wave resistance in deep water or sea areas with large waves. There was a problem. In addition, the lid method had the inconvenience of having to dive under the water and open the lid each time to feed.

The present invention was made in view of the problems of the prior art, and its purpose is to improve the habit of crawling aquatic animals not to invade gas-filled spaces when underwater. The aim is to prevent crawling aquatic animals from moving and escaping by providing air pockets horizontally at appropriate locations in the underwater portion of the barrier.

"Means for Solving the Problem" In order to achieve the above object, the movement prevention device of the present invention has an air pocket in the shape of a downward gutter with an open bottom and substantially horizontal at a suitable underwater location of the barrier object. It was installed horizontally.

Preferably, the barrier is an artificial wall such as a mesh wall, a metal plate, or a concrete wall.

Further, for the same purpose, the barrier may be a container body or a natural rock wall.

Furthermore, it is preferable that the air reservoir portion forms an air ring continuously around the inner periphery of the barrier object in order to enclose air.

"Function" The barrier is fixed in place underwater by any means so as to constitute an enclosure. A substantially horizontal downward gutter-shaped air reservoir is installed horizontally at the upper end of the barrier, and an air ring is formed around the inner circumference of the upper end of the barrier, but the upper part of the area surrounded by the barrier is , in an open state underwater.

"Embodiments" Hereinafter, embodiments of the movement prevention device for crawling aquatic animals according to the present invention will be described with reference to the drawings.

Figure 1 is a cross-sectional view of an example in which a metal or concrete plate wall is used as a barrier, Figure 2 is a cross-sectional view of an example in which a mesh wall is used as a barrier, and Figure 3 is an example in which a container is used as a barrier. FIG. 4 is a side sectional view of an embodiment in which a natural reef is used, and FIG. 5 is a perspective view of an embodiment in the form of a tower.

In the figure, 1 is a plate-shaped wall made of metal or concrete, and 2 is a mesh wall. These plate-like walls 1
An enclosure is constructed at a suitable location underwater using a net wall body 2 and serves as a barrier. As shown in FIG. 3, this barrier may be formed on the container body 4 and placed at a suitable location underwater. 3 is an air pocket formed on the inner peripheral wall of the underwater part at the upper end of the barrier, and this air pocket 3 is shaped like a downward gutter. Prevents the robot from climbing over the barrier while crawling and escaping by moving outside the barrier. This is because crawling animals have a habit of not entering gas-filled spaces when underwater.

In FIG. 4, a natural hollow or a rocky reef 5 is used as a barrier, and in this case as well, an air reservoir 3 is horizontally installed at the upper end of the barrier.

In the embodiments shown in FIGS. 1 and 2, downward gutter-like air reservoirs 3 are formed on both sides of the upper end of the barrier, but depending on the growth stage and type of the crawling animal in the appropriate place underwater, It is designed so that it can be divided into sections.

FIG. 5 shows another embodiment, in which a downward gutter 6 with an open bottom is constructed in the shape of a picture frame, an air pocket 3 is formed around its four peripheries, and support legs 7, 7, 7, 7 are provided at its four corners. It is shaped like a tower. Then, a net 8 made of polyethylene or the like is suspended from the lower outer peripheral edge of the downward gutter 6.
A large number of sandbags 9, 9, ... are placed on the edge of the hem for weight. If this is placed on the bottom of the water and a creeping aquatic animal is reared in the net 8, the animals that crawl up the inner surface of the net 8 will be fed by the air pocket 3 in the downward gutter 6 at the top. Progress is blocked and escape is prevented. This embodiment is suitable for aquaculture using the ebb and flow of the tide by installing it on a coral reef or shallow water.

``Effects of the Invention'' As described above, the present invention takes advantage of the habit of crawling aquatic animals that dislike gas in water, and creates a substantially horizontal downward gutter-shaped barrier with an open bottom at an appropriate location underwater. Since the air reservoir is placed horizontally, animals that crawl up barriers cannot overcome the air in the air reservoir, so they are prevented from moving outside the enclosure, and they are not allowed to move to specific areas such as underwater farms. It can be restrained and cultivated.

In addition, there is no need to make the upper end of the barrier protrude above the water surface or cover it as in the past, and there is no need to dive for feeding, and if it is configured in a tower shape, it can be used in any location, such as coral reefs. It has advantages such as being able to be easily moved and installed at a required location.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a cross-sectional view of an embodiment in which a metal or concrete plate wall is used as a barrier, and Fig. 2 is a cross-sectional view of an embodiment in which a mesh wall is used as a barrier. In the figures, Fig. 3 is a side sectional view of an embodiment in which the barrier is a container body, Fig. 4 is a side sectional view in the case of using a natural reef, and Fig. 5 is a perspective view of an embodiment in which the barrier is shaped like a tower. It is a diagram. DESCRIPTION OF SYMBOLS 1... Plate wall body, 2... Net wall body, 3... Air reservoir part, 4... Container body, 5... Rock reef, 6... Downward gutter,
7... Support legs, 8... Net, 9... Sand bag.

Claims (1)

[Scope of Claims] 1. A movement prevention device for creeping aquatic animals, characterized in that a substantially horizontal downward gutter-like air reservoir with an open bottom side is installed horizontally at a suitable underwater position of a barrier object. 2. Movement prevention for creeping aquatic animals as set forth in claim 1, wherein the underwater barrier includes a barrier made of an artificial wall such as a net wall, a metal plate, or a concrete wall. Device. 3. The movement prevention device for a creeping aquatic animal according to claim 1, wherein the underwater barrier is a container. 4. The movement prevention device for creeping aquatic animals according to claim 1, wherein the underwater barrier is a natural rock wall.