JPH0430813B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a reef for spiny lobsters that promotes the generation of iron ions and promotes spawning and landing of spiny lobsters on the bottom.

<Prior art and its problems> Spiny lobsters mainly live on the Pacific coast of Japan, and are widely known as edible because of their delicious taste. It is active at night and prefers rocky reefs. Toroko, this spiny lobster is protected by prohibiting fishing during the summer as it is the spawning season.
Since it lasts from October to May of the following year, it is considered expensive not only because of its beautiful appearance and color, but also because it is rarely available.

By the way, as mentioned above, this spiny lobster lives on rocky reefs and is active at night, so the common way to catch them is to set gillnets around the reef in the evening and catch them in the early morning. There was no way that the spiny lobsters were forced to gather in one place, nor were there any reefs exclusively for spiny lobsters. Therefore, there was no technology for establishing spiny lobsters, and as a result, spiny lobsters became expensive.

In consideration of these circumstances, the present inventors, in conjunction with the research and development of artificial fish reefs that have been carried out for a long time, aimed to develop fish reefs that are particularly suitable for spiny lobsters, by developing seabeds where spiny lobsters grow, especially rocky reefs. As a result of research into the shape and environment of the block, they developed a fish reef for spiny lobster that has a substantially hemispherical dome shape with numerous recesses formed on the wall of the block body. However, this reef for spiny lobsters did not use metal members. In general, metal parts, especially iron, are oxidized by oxygen in water, melt and float as fine particles, which are converted into iron ions when exposed to ultraviolet rays contained in sunlight, and these iron ions are It is absorbed by phytoplankton, becomes a valuable nutrient, and causes them to multiply. Zooplankton eats phytoplankton and proliferates, and eventually spiny lobsters eat this zooplankton and multiply.

On the other hand, fish reefs partially using metal members as described above have also been developed, and one example is shown in Japanese Utility Model Application Publication No. 62-65066. The fish reef shown in this publication has a hollow fish reef body with a number of holes drilled therein, and can-shaped metal members fixed to the holes.

However, since a part of the metal member here is fixed to the reef body, the metal member will rust over time, but will eventually separate as the rust progresses. Although the metal member is originally provided as a protective reef for young children, it is also likely that rusting of iron ions will occur as a side effect, so separating it is preferable in both of the above senses. do not have.

<Means for Solving the Problems> Therefore, in order to solve the above-mentioned problems, the reef for spiny lobster according to the present invention has a large number of recesses formed on the wall surface of the block main body, which is formed into a substantially hemispherical dome shape. A pipe-shaped iron member is mounted in the recess so that the entire outer periphery of the iron member is in close contact with the recess to promote the generation of iron ions and to easily separate the iron member no matter how much rust progresses on the iron member. Moreover, as long as there are iron members that have become fragmented due to rusting, the generation of iron ions is continued, thereby promoting the spawning and landing of spiny lobsters on the bottom.

<Example> Next, an example of a reef for spiny lobster according to the present invention will be described based on the drawings. 1 is a block body formed in a hemispherical dome shape, and 2 is a block body formed in the top of this block body 1. It is a hole. Reference numeral 3 denotes a recess formed in the wall surface of the block main body 1. When the recess 3 is formed only on the outer surface side of the block main body 1 as shown in FIG. When the hole is formed not only on the outer surface side but also on the inner surface side, and when it is formed in the shape of a through hole that penetrates the inside and outside of the wall surface of the block body 1 as shown in FIG. There are various configurations such as a hole, a case where the diameter of the inner part is larger than the opening as shown in FIG. Further, the shape of the recess 3 is not limited, such as when it is rounded or rectangular (or square) as shown in the figure. 4 is a pipe-shaped iron member installed in the recess 3; this iron member 4 is formed in the recess 3 in a shape that follows the wall surface of the recess, and the entire outer periphery of the iron member 4 is attached to the recess 3; It is attached tightly inside.

<Function> The spiny lobster lays eggs in the block body 1, and after hatching, it lives in the block body 1. That is, when adult spiny lobsters grow within the iron member 4 attached to the recess 3, they will spawn there. When the eggs are laid, they hatch, and the hatched young spiny lobsters are placed in a concave area 3 corresponding to their own body.
(inside the iron member 4) and grow there. Over time, when the recess 3 (inside the iron member 4) where they originally lived feels cramped, they move into another relatively large recess 3 (inside the iron member 4).
They eventually live there, and gradually move to larger recesses (inside the iron member 4). And that's where you will grow. The reason why the block body 1 is formed into a hemispherical dome shape is to make the living environment as dark as possible, considering that the spiny lobster is nocturnal.

It is also said that the biggest enemy of spiny lobsters is octopus. However, moray eels are said to be the enemy of this octopus, and moray eels do not view spiny lobsters as harmful. Therefore, in the block body 1 according to the present invention, the concave portion 3 is formed into a large rectangular shape to encourage moray eel inhabitation, thereby allowing the moray eel to prey on the approaching octopus. It can be done.

<Effects of the Invention> As described above, according to the reef for spiny lobster according to the present invention, a large number of recesses are formed on the wall surface of the block main body formed in the shape of a substantially hemispherical dome, and an iron member formed in the shape of a pipe is inserted into the wall of the block body. Since it is installed in the recess so that the entire outer periphery is in close contact, it promotes the generation of iron ions and prevents the iron member from easily separating no matter how much rust progresses. As long as the fragmented iron material is present, the generation of iron ions can be sustained, thereby promoting spawning and landing of spiny lobsters on the bottom.

[Brief explanation of drawings]

The drawings show an embodiment of the reef for spiny lobster according to the present invention, and FIG. 1A is a front view, FIG. 1B is a plan view, FIG. 2C is a bottom view, and FIG.
The A-line cut section end view, FIGS. 3 and 4 are front view A, top view B, bottom view C, and FIG.
The figures are cross-sectional views showing the main parts, of which A is a case in which the recess is formed only on the outer surface of the block body, B is a case in which the recess is formed on the inner and outer surfaces of the block body, and C is a cross-sectional view that extends through the recess. In the case where the recess is formed in the shape of a hole, Figure D shows the case where the inside diameter of the recess is enlarged. 1... Block body, 2... Hole, 3... Recessed part,
4...Iron parts.

Claims (1)

[Scope of Claims] 1. A large number of recesses are formed in the wall surface of the block main body formed into a substantially hemispherical dome shape, and an iron member formed in the shape of a pipe is installed in the recesses so that the entire outer periphery of the iron member is in close contact with the block body. A fish reef for spiny lobster that is characterized by: 2. A reef for spiny lobster according to claim 1, wherein the recess is formed on the outer surface of the block body. 3. A reef for spiny lobster according to claim 1, wherein the recessed portions are formed on both the outer and inner surfaces of the block body. 4. A reef for spiny lobster according to claim 1, wherein the recess is a through hole. 5 Claim 1, in which the recess is a bottomed hole;
The reef for spiny lobster according to paragraph 2 or 3. 6. A reef for spiny lobster according to claim 1, 2, 3, 4, or 5, in which the diameters of the openings of all the recesses are made uniform. 7 Claims 1, 2, 3, 4, or 5 in which the openings of the recesses have different diameters.
Reef for spiny lobster as described in section. 8. Claims 1, 2, 3, 4, 5, 6, or 7, wherein the diameter of the inner part of the recess is larger than the diameter of the opening. Reef for spiny lobster.