JPH0327176B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an artificial spiny lobster reef used to enhance the aggregation effect of spiny lobsters.

(b) Conventional technology Conventionally, artificial Ise lobster reefs have been constructed by putting natural stones into the sea, surrounding natural stones with a steel frame,
It was known to combine concrete plates.

(c) Problems to be solved by the invention However, the ecology of spiny lobster and its growth process, etc.
At present, there are many aspects that are not clear, and the methods described above cannot be said to be compatible with the ecology of spiny lobsters, and are not very effective. Therefore, in order to obtain a good reef for collecting spiny lobsters, it is necessary to fabricate artificial spiny lobster reefs of various shapes and actually put them into the sea to experimentally confirm the shrimp collecting effect. That is essential.

Also, spiny lobsters are very timid animals.
They have a strong desire for contact, and when they are crawling in a hole, they spread their legs on both sides and prop themselves up against the wall to anchor themselves. Therefore, it is difficult to collect spiny lobsters of various sizes in a spiny lobster reef that only provides caves of a uniform size.

In addition, octopuses are the natural enemy of spiny lobsters, and when octopuses attack spiny lobsters, they usually attack from behind, so it is necessary to block off the back of the cave to prevent octopuses from entering. However, in order for the cave to be comfortable for the spiny lobsters, it is necessary for fresh seawater to constantly circulate and oxygen to be supplied, and unless these conditions are met, the Ise lobster gathering effect will not improve. .

Furthermore, spiny lobsters are not good at moving vertically, so if the reef is made three-dimensional, there is a high possibility that spiny lobsters will not gather at the top of the reef.

In view of the above-mentioned circumstances, the present invention has a high effect of attracting spiny lobsters, can protect the spiny lobsters from invasion by natural enemies such as octopuses, and has a high effect of attracting shrimps even when the reef is made three-dimensional. The purpose is to provide an artificial Ise lobster reef.

(d) Means for solving the problem Therefore, the applicant manufactured artificial spiny lobster reefs of various shapes, put them into the sea, and experimentally observed the conditions of the spiny lobster collection. We researched whether an artificial rocky lobster reef shaped like this would be suitable for a collection of rocky lobsters.

As a result, the following findings were made.

When the artificial Ise lobster reef is constructed using a flat plate, it is desirable that the plate has a rectangular shape, such as an octagon or a hexagon, with corners formed around the periphery. This is because when artificial reefs are arranged continuously, they can be arranged in high density, and furthermore, they tend to serve as a foothold for Ise lobsters when they migrate.

Further, it is preferable that a plurality of the above-mentioned flat plates are laminated. By doing so, it is not only possible to easily form a dark area within the reef that is preferred by spiny lobsters, but also to build a three-dimensional reef, which increases the collection effect.

Furthermore, it is desirable that the flat plate described above has a water passage hole in the center. This is because the water holes promote the flow of seawater within the planar plate, allowing fresh seawater to constantly flow through the Ise Lobster Reef.

It is desirable that partition walls be provided between each stacked plane plate, and that the partition walls be provided parallel to each other. This is because the spiny lobster's habitat in its natural state is usually a place with nearly parallel walls that fit its long and slender body, such as cracks in rocks.

Based on the above experimental results and the habits of Ise lobster, the artificial Ise lobster reef according to the present invention has a water passage hole 2a in the center and a corner 2b around the periphery, and has different planar sizes. It has a plurality of flat plates 2, and the flat plates are stacked so that the size becomes smaller from the bottom to the top, and a step part 2c with an open upper space is formed on the outer periphery of the flat plate. , partition walls 5 are arranged between the laminated planar plates so that at least some of the partition walls are parallel to each other and form a plurality of types of intervals W1, and the partition walls 5 are arranged in the vicinity of the water passage hole. baffle plate 5' dividing the space between the plane plates around the water passage hole between the plane plates;
It is configured by installing.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The same applies to the column "e. Effect" below.

(e) Effect In other words, the present invention provides a structure in which the laminated flat plates 2 provided with water passage holes 2a and the partition wall 5 installed between each flat plate 2 provide a foothold for spiny lobsters, the formation of dark areas, and the circulation of seawater. In terms of habitat, etc., it acts to constitute a good gathering place close to nature.

(f) Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is a front view showing an embodiment of the artificial Ise lobster reef according to the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4 is a 1, and FIG. 5 is a sectional view taken along the line - in FIG. 1.

As shown in FIGS. 1 and 2, the artificial Ise lobster reef 1 is formed into an octagonal shape with corners 2a around the periphery, and has a planar size, that is, the size as seen from above in FIG. 1. It has a total of six flat plates 2 of three different types, and these flat plates 2 are provided in a stacked manner. In addition, these flat plates 2 are stacked so that their planar size decreases as they move upward in FIG. A stepped portion 2c is formed with an open upper space to facilitate climbing of the shrimp reef.
On the underside of the flat plate 2 at the bottom of Fig. 1, legs 3 for installation on the seabed are installed evenly so that the Ise lobster reef 1 can be placed stably without moving or falling due to tides, etc., as shown in Fig. 3. There are three locations at different angles, and each plane plate 2
A large number of block-shaped partition walls 5 are provided between them. As shown in FIGS. 3 to 5, the partition walls 5 are installed so that the partition walls 5 are as parallel as possible, and the intervals W1 are also set at various intervals depending on the size of the spiny lobster. It is formed of. Further, a water passage hole 2a is bored in the center of each plane plate 2, and the partition wall 5 is arranged as appropriate so as not to block the flow of seawater between the water passage hole 2a and the outside of the plane plate 2. The arrangement is formed.

In addition, there are water holes 2 in the vicinity of the water holes 2a of each layer.
As shown in FIGS. 3 to 5, the space connecting the water hole 2a and the outer periphery of the flat plate 2 is divided so that the space a does not become an entry path for octopus, which is a natural enemy of spiny lobsters. , a plurality of baffle plates 5', and a water passage hole 2a.
(in the case of Fig. 3, eight baffle plates 5' that also serve as partition walls are arranged radially) or surrounding the water passage hole 2a (in the case of Fig. 4 and 5).
In the case of the figure, four baffle plates 5' are arranged in a rectangular shape), and these baffle plates 5'
As a result, the space around the water hole 2a between the flat plates 2, 2 is divided, and it is possible to prevent the octopus from entering from the side of the water hole 2a toward the outer peripheral part of the flat plate.

(g) Effects of the invention As explained above, it has a plurality of flat plates 2 of different planar sizes, each having a water hole 2a in the center and corners 2b around the periphery. These flat plates are stacked so that the size becomes smaller from the bottom to the top, and a stepped portion 2c with an open upper space is formed on the outer periphery of the flat plate, and between the stacked flat plates. The partition walls 5 are arranged such that at least some of the partition walls are parallel to each other and form a plurality of types of intervals W1, and the water passage holes are arranged between plane plates near the water passage holes. Since the baffle plate 5' is installed to divide the space between the flat plates in the periphery, the corner 2b serves as a foothold for the spiny lobster, and the laminated flat plates 2 are able to catch the spiny lobster despite the existence of the water holes 2a. In addition to forming a wide dark area within the reef, the water passage hole 2a promotes the flow of seawater inside and outside the Ise lobster reef 1, and the partition wall 5 provided in parallel allows the Ise lobster to maintain its natural habitat. This makes it possible to provide a cave with an environment similar to that of the Ise-Ebi Reef, and the above-mentioned conditions for a good Ise lobster reef can be satisfied.

Furthermore, a plurality of flat plates 2 of different sizes are stacked so that the size becomes smaller from the bottom to the top, and a stepped portion 2c with an open upper space is formed on the outer periphery of the flat plate. The stepped portion functions as a platform to support the spiny lobsters climbing the reef 1 from the seabed, allowing the spiny lobsters to easily reach the upper part of the reef 1, and even if the reef 1 is made three-dimensional, it is still high. It is possible to exert a collective effect.

In addition, a baffle plate 5' was installed between the flat plates near the water hole to divide the space between the flat plates around the water hole. By dividing the space between the face plates,
The baffle plate can prevent octopus, a natural enemy, from entering through the water hole located behind the spiny lobster, which lives between the partition walls with its head facing the outer periphery of the flat plate.

Furthermore, since at least some of the partition walls are arranged parallel to each other and to form multiple types of intervals W1, it is possible for these partition walls to provide cavities with various widths to the spiny lobster. One reef can provide caves for spiny lobsters of various sizes and therefore various stages of development, making it possible to collect spiny lobsters of various sizes.

As a result of experiments, the artificial lobster reef 1 shown in FIG. 1 showed a good lobster gathering effect.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the artificial Ise lobster reef according to the present invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a plan view of Fig. 1.
1, FIG. 4 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line - in FIG. 1. 1...Artificial Ise lobster reef, 2...Plane plate, 2a...
...water hole, 2b...corner, 5...partition wall.

Claims (1)

[Scope of Claims] 1. A water supply hole is provided in the center, and a plurality of flat plates of different planar sizes are formed with corners around the periphery, and the flat plates extend from the bottom to the top. The planar plates are stacked so that the size thereof becomes smaller as the size of the planar plates decreases to form a stepped portion with an open upper space on the outer periphery of the planar plates, and a partition wall is provided between the stacked planar plates, at least one of the partition walls is formed. a baffle plate arranged so that the partition walls of the parts are parallel to each other and form a plurality of spacings, and divides the space between the plane plates near the water passage hole between the plane plates near the water passage hole; An artificial Ise lobster reef constructed by installing.