JPH0463658B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to the habitat and development of shrimp such as spiny lobster, benthic fish, and other general small reef fish and shellfish (hereinafter also simply referred to as spiny lobster). This invention relates to a fish reef block suitable for breeding.

(Prior Art and Problems to be Solved by the Invention) Several fish reef blocks intended for the propagation of spiny lobsters and the like have been known. For example, fish reef blocks such as ceramic solid rectangular fish reefs and FRP abalone, sea urchin, and rock lobster reef blocks are known. However, these fish reef blocks do not necessarily fully take into account the natural habit of spiny lobsters and the like, which prefer slit-like holes and crevices on slopes such as rocky areas. There were also problems in terms of the type and number of holes suitable for the habitat of spiny lobsters, etc., and in terms of defense against external enemies.

In view of these circumstances, the present invention provides a fish reef block that takes into consideration the original habits of spiny lobsters, secures holes suitable for their habitat according to their stages of growth, and is also excellent in terms of defense against external enemies. It is.

(Means for Solving the Problems) The present invention intends to solve the above problems and employs the following configuration. That is, in the present invention, a plurality of vertical leg wall plates are arranged radially with one end of each leg wall plate positioned at the center of a circle, and a slope plate having a downward slope from near the upper end of the leg wall plates is provided. This is a fish reef block characterized in that the slope plate is provided with a plurality of slit-like through holes of different sizes from the front surface to the back surface.

The vertical leg wall plate serves as a support leg for a slope plate that is provided almost vertically and has a downward slope from near its upper end, and also functions as a wall surface that forms a space within the fish reef block. By radially arranging these leg wall plates, non-directionality and positional stability as a fish reef block are ensured.

The greatest feature of the present invention is that a slope plate having a downward slope is provided from near the upper end of the vertical leg wall plate, and a plurality of slit-like through holes of different sizes are bored in the slope plate from the front surface to the back surface. This is what is being done. It is important that the slit-like through-holes in the slope plate suit the habits of spiny lobsters, which prefer holes and cracks on sloped surfaces such as rocky areas, and contribute to their propagation. . Here, the slit-like shape refers to a through hole in which the ratio of the length to the width of the through hole is 3 or more.

FIG. 1 is a perspective view showing a typical embodiment of the fish reef block of the present invention.

In FIG. 1, four vertical leg wall plates 1 are arranged radially, that is, in a cross shape in this case, with one end of each leg wall plate positioned at the center of a circle, and near the upper end of each leg wall plate 1. A slope plate 2 having a downward slope is provided. In addition, although the slope plate 2 is generally a substantially flat plate having a quadrilateral shape, a curved plate may also be used.
The downward slope may be a downward slope as a whole, and may be a step-like downward slope, for example. In addition, the slope of the slope plate 2 can be appropriately determined by taking into consideration the height of the leg wall plate 1, the horizontal spread of the fish reef block, the number and size of through holes drilled in the slope plate 2, etc. good. In view of the habits of spiny lobsters, etc., it is preferable that the slope be about 30 to 6 degrees.

The slope plate 2 has grooves 3 arranged in a lattice pattern on its surface, and a plurality of through holes 4 of different sizes extending from the bottom of the groove to the back surface of the slope plate. The shape of the through-hole 4 needs to have a slit-like cross section, such as a horizontally long quadrilateral shape as shown in FIG. 1, due to the habits of spiny lobsters and the like as described above. The depth of the through hole 4 can be set to a desired depth by appropriately selecting the thickness of the slope plate 2, but it is also possible to make the through hole not perpendicular to the surface of the slope plate but at a certain degree of inclination. The depth of the through-hole can also be adjusted by adopting a mode in which the through-hole is bored in a leaning manner, or a mode in which a cylindrical object is inserted into the through-hole even if the slope plate is small.

In addition, from the perspective of targeting spiny lobsters of different sizes at various growth stages, through holes 4
It is necessary that through-holes of different sizes are bored as appropriate.

Furthermore, by providing through holes in the leg wall plate 1 from the front surface to the back surface, it is possible to increase the number of through holes and to improve water passage.

In Figure 1, grooves 3 are provided in a lattice pattern on the surface of the slope plate, and the presence of these grooves facilitates the movement of spiny lobsters etc. from one through hole to another, especially for escaping foreign predators. This has the advantage of making it easier to move around. Therefore, in addition to the configuration of the grooves shown in FIG. 1, it is also good to use, for example, a sloped plate having a considerable thickness and to communicate the through holes with tunnel type grooves.

Further, both the slope plate and the leg wall plate do not necessarily have to have a planar structure, and may have a bone structure such as a lattice shape, for example.

A space is formed between the slope plate and the leg wall plate, using these as walls, but in order to make this space a communicating space, it is necessary to connect the front side of the leg wall plate and one end of the slope plate. It is sufficient to use a leg wall plate obtained by cutting a portion of the leg wall plate located below the corresponding tangent that comes into contact with the leg wall plate.

Spiny lobsters and the like can enter appropriate through-holes in the slope plate, sometimes reaching other through-holes via grooves, and can escape predators by swimming in the space formed between the slope plate and the leg wall plate. .

FIG. 2 is a perspective view showing another aspect of the invention. A major feature of the embodiment shown in FIG. 2 is that the slope plate is formed of a panel section 2-a having a number of through holes, and a frame section 2-b into which the panel section is fitted, and the panel section and the frame section can be attached and detached. It can be configured freely. The advantage of such a configuration is that the panel portion 2-a can be replaced with a panel portion having an optimal through hole 4 as appropriate depending on the type of fish and shellfish such as spiny lobster to be used. Panel part 2-a and frame part 2
A typical example of the fixing means (b) is a means of tightening and fixing the other part to a nut embedded in one of the panel part and the frame part in advance using a bolt, as shown in FIG. Any fixing means such as fitting and fixing may be employed.

(Operations and Effects) The fish reef block of the present invention has the following excellent effects as a fish reef block by employing the above configuration. First, since the through-holes are drilled in the slope plate, an environment similar to that found in holes such as cracks on slopes of rocky areas, etc., which spiny lobsters and the like like, can be obtained. In addition, by drilling through holes of different sizes, it is possible to target spiny lobsters at various growth stages. Due to the presence of different through-holes, a through-hole of an appropriate size remains in one of the through-holes, and it is possible to cope with environmental changes over time. Furthermore, the presence of through holes and spaces between the slope plate and the leg wall plate makes it easy to defend against external enemies.
In the embodiment in which grooves are provided between the through holes, it is possible to escape from external enemies and easily move between the through holes. In addition, the presence of the through-hole allows for good drainage, and since the through-hole is provided in the slope plate, there is no possibility that sand and mud will accumulate inside the through-hole and cause it to become clogged. In addition, the positional stability is good, there is relatively no directionality, and there are almost no so-called nets such as fish reefs.

In addition, in an embodiment in which a panel part with a removable slope plate is constructed with a frame part, there are many practical advantages such as the ability to create an optimal reef block according to the target fish by changing the panel part as appropriate. have

[Brief explanation of the drawing]

FIGS. 1 and 2 are oblique views of a typical reef block of the present invention. 1 is a leg wall plate, 2 is a slope plate, 2-a is a slope plate panel portion, 2-b is a slope plate frame portion, 3 is a groove, and 4 is a through hole.

Claims (1)

[Scope of Claims] 1. A plurality of vertical leg wall plates are arranged radially with one end of each leg wall plate positioned at the center of a circle, and the leg wall plate has a downward slope from near the upper end thereof. A fish reef block 2 characterized in that a face plate is provided, and a plurality of slit-like through holes of different sizes from the front surface to the back surface are bored in the slope plate.Four leg wall plates are provided on each leg wall plate. The fish reef block 3 according to claim 1, which is arranged in a cross shape with one end located at the center of the circle.The through holes of the slope plate are grooves formed in a grid pattern on the surface of the slope plate. The fish reef block according to claim 1, which has a through hole extending from the bottom to the back surface of the slope plate. 4. Claim 1, in which the slope plate is composed of a panel portion having a plurality of through holes and a frame portion into which the panel portion is fitted, and the panel portion and the frame portion are detachable.
Fish Reef Block 5 as described in Section 5 A patent in which the leg wall plate is a leg wall plate in which a portion of the leg wall plate located below the corresponding tangent line where the front surface of the leg wall plate and one end of the slope plate abut is cut off. Fish reef block 6 according to claim 1. Fish reef block according to claim 1, wherein the leg wall plate is a leg wall plate having a through hole formed from the front surface to the back surface of the leg wall plate.