JPS63105627A - Artificial fish bank - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to an artificial fish reef that is used underwater, for example, by being submerged in the sea, and particularly to an artificial fish reef that has a space formed inside for fish and shellfish to live. It is.

``Prior Art'' Conventionally, this type of fish reef has been generally used by assembling steel or concrete into a frame to form a space inside the frame for fish and shellfish to live in.

Because these reefs have a frame-like structure, their interior space is open on both sides.
Seawater can freely flow inside and outside the reef.

``Problems to be solved by the invention'' By the way, when the temperature drops significantly in winter,
When seawater is cooled near the water surface, large convection flows occur in the vertical direction, and as a result, the cooled seawater may reach the ocean floor.

In such cases, if a conventional fish reef like the one described above is sunk on the seabed, cold seawater flowing downward in the sea can easily enter the reef from the upper part of the reef. Even warm seawater easily flows upwards, causing the water temperature within the reef to drop below a temperature suitable for fish and shellfish to live in. This has caused problems such as the fish and shellfish living in these reefs dying or moving to deeper waters where the water temperature does not drop.

This invention was made in view of the above circumstances, and even when the surrounding seawater temperature drops in winter, it is possible to suppress changes in water temperature within a fish reef and maintain a good habitat for fish and shellfish. The purpose is to provide a possible artificial reef.

"Means for Solving the Problem" The first invention is an artificial fish reef that is submerged in water and has a space inside for fish and shellfish to live in, in which the upper part of the space is closed. It is characterized by being It is desirable that a portion of the sides of this space be closed.

Further, a second invention provides an artificial fish reef that is used submerged in water and has a space formed inside for fish and shellfish to live, in which at least an upper part of the space is closed, and the space is It is characterized by being equipped with a heating means for heating the water inside. This heating means may be constructed by a heat pipe that transfers geothermal heat in the underwater ground into the space, or may be constructed so that a solar cell placed on the water surface energizes a heater placed in the space; It is conceivable to configure the space so that hot water obtained by a solar water heater placed above is introduced into the space.

"Function" According to the artificial reef of the first invention, by blocking the upper part of the habitat space for fish and shellfish, it is possible to prevent cold seawater from directly flowing in from above the reef, and to prevent the cold seawater from directly flowing in from above the reef. Prevents hot seawater from flowing upward due to convection. Furthermore, according to the artificial reef of the second invention,
By increasing the water temperature within the fish reef using a heating means, a favorable habitat for fish and shellfish is maintained.

"Embodiments" Examples of the present invention will be described below with reference to FIGS. 1 to 5.

First, the reef A of the first embodiment will be explained with reference to FIG. This fish reef A consists of a bottom frame l assembled into a square shape, a vertical frame 2 fixed to this bottom frame l,
It is constituted by an upper plate 3 fixed substantially horizontally to the upper part of this vertical frame 2. As a result, this fish reef A has a space 4 formed inside where fish and shellfish live, and the upper part of this space 4 is closed by the upper plate 3, and the sides are designed so that fish and shellfish can enter and exit and seawater can circulate. It is open to the public. Although it is desirable that the reef A is constructed of reinforced concrete, the structure is not limited to this, and for example, the frame 1.2 may be constructed of steel.

This fish reef A is used by being submerged on the seabed like a conventional artificial fish reef, and the space 4 inside thereof is provided as a place suitable for fish and shellfish to live.

According to this fish reef A, since the upper part of the space 4 is closed by the upper plate 3, even if the water temperature near the sea surface decreases in winter and vertical convection occurs, the cold seawater flows above the fish reef A. It is possible to prevent the seawater from directly flowing into the reef A, and also to prevent relatively high temperature seawater within the reef A from flowing upward due to convection. Therefore, compared to conventional fish reefs with open tops, changes in the water temperature within this fish reef A are sufficiently suppressed, and the water temperature within the fish reef A does not drop suddenly, creating conditions suitable for fish and shellfish to live in. can be maintained.

Next, the reef B of the second embodiment will be described with reference to FIGS. 2(a) and 2(b). This fish reef B has a bottom plate 5,
The side plate 6 and the top plate 7 form a hollow box shape with a space 8 inside. A partition wall 9 is provided inside the fish reef B, as shown in FIG. 2(b), and openings 10 are formed in the side plate 6 and the partition wall 9, respectively. This opening 10... serves as a seawater circulation port and an entrance/exit for seafood, and this opening IO/
The position and dimensions of the partition wall 9, the shape of the partition wall 9, etc. may be appropriately determined depending on the type of seafood to be processed. In addition, this fish reef B
It is desirable that the building be constructed of reinforced concrete, but it is not limited to this. Further, the partition wall 9 may be omitted if unnecessary.

According to this fish reef B, the upper and side parts of the space 8 are the upper plate 7.
, are closed by the side plates 6 except for the openings 10, so that convection of seawater can be prevented not only above but also to the sides of the fish reef B, further suppressing changes in water temperature inside the fish reef B. be able to.

Next, the reef C of the third embodiment will be explained with reference to FIG. Figure 3 shows this fish reef C submerged on the seabed. As shown in this figure, the fish reef C is composed of a fish reef main body II and a heat pipe 12 which is a means for heating seawater within the fish reef main body II. Fish reef body 1
1 has the same structure as the fish reef B of the second embodiment described above, so its constituent elements are designated by the same reference numerals as in FIG. 2, and a description thereof will be omitted. A lower part of the heat pipe 12, that is, a heat absorption part 12a is buried in the seabed ground 13 below this fish reef body 11, and this heat pipe I
The upper part of the fish reef body 11, that is, the heat dissipating part 12b is located within the internal space 8 of the fish reef body 11.

Based on the above configuration, this fish reef C has not only the fish reef main body 11 acting in the same manner as the above-mentioned fish reef B to suppress changes in water temperature in the internal space 8, but also the heat pipe 12 pumping up geothermal heat. This heats the internal space 8. Therefore, according to this fish reef C, even if the decrease in water temperature inside the fish reef body II cannot be sufficiently suppressed by preventing convection alone, it is possible to maintain the internal water temperature in a condition favorable for habitat = 7- It is.

According to this fish reef C, geothermal heat is transferred to the heat pipe 12.
Since heating is performed only by pumping water up, no artificial energy is required and there are no operating costs. In addition, since the top and sides of the reef body 11 are closed except for the opening 10, the warmed water inside does not wastefully flow out of the reef body 11, and a sufficient heating effect can be obtained. .

In addition, in this fish reef C, the number of installed heat pipes 12 and the heat radiation amount thereof may be determined as appropriate depending on the type of target seafood and the expected degree of water temperature drop. Also,
As shown by the two-dot chain line in FIG. 3, the heat pipe 12 may be buried around the fish reef body 11 and penetrated through the side wall 6, so that the heat radiating portion 12b is disposed in the space 8.

Next, referring to FIG. 4, the fish reef of the fourth embodiment will be described. This fish reef is similar to the above-mentioned fish reef C, that is, the fish reef main body 1.1 is configured similarly to the above-mentioned fish reef B.
and a heating means I4. Heating means 1
4 includes a solar cell I6 floating on the sea surface by a buoy 15, and a cable 1 attached to the reef body ll.
7 and an electric heater 18 that is energized by the solar cell 16.

According to this fish reef, like the above-mentioned fish reef C, it is possible to maintain a good environment by heating the space 8 inside the fish reef body 11 with the heating device 14, and it is possible to use natural energy called solar heat. The operating costs are not very high.

Next, the fish reef E of the fifth embodiment will be explained with reference to FIG. This fish reef E consists of a fish reef main body 11 similar to the above-mentioned fish reefs C and D, and a heating means I9. The reef main body I is heated by hot water obtained by the solar water heater 21.
It is composed of a hot water heater 22 that heats the space 8 in the room, and a pipe line 23 that circulates the hot water. This fish reef E can also achieve exactly the same effect as the fish reefs C and D described above. In addition, in this fish reef E, the water in the space 8 may be directly passed through the solar water heater 21 and heated without using the hot water heater 22.

Hereinafter, embodiments of the present invention have been described, but the present invention is not limited to the embodiments described in section 1. For example, in the first invention, the shape of the reef may be any suitable shape. Further, in the second invention, various shapes of the reef body can be considered, and the heating means may be any suitable means other than the above embodiments, and by providing the heating means with an appropriate water temperature control means, It is also possible to control the water temperature within the reef itself.

Note that this invention is not limited to adhesives used in the sea, and can of course be used in freshwater such as lakes and marshes.

"Effects of the Invention" As explained in detail above, according to the artificial reef of the first invention, since the upper part of the space where fish and shellfish live is closed, vertical convection can be prevented, and the surrounding water temperature can be lowered. It is possible to suppress changes in the water temperature inside the fish reef, even when the fish and shellfish are living in the reef, thereby preventing the fish and shellfish living in the reef from dying or moving elsewhere. In addition, closing a portion of the side portion of the space and shifting it can also prevent horizontal convection, which has the effect that the above effect is further enhanced.

Further, according to the artificial reef of the second invention, since at least two parts of the space mentioned above are closed and a heating means is provided for heating the water in this space, the artificial reef of the first invention is provided. In addition, it has the effect of maintaining a good habitat for fish and shellfish.In addition, if natural energy such as geothermal heat or solar heat is used as a heating means, operating costs can be reduced. The effects of -J2 can be obtained without the need for.

[Brief explanation of the drawing]

1 to 5 are diagrams showing embodiments of the present invention. Fig. 1 is a perspective view showing the overall schematic structure of the first embodiment, and Fig. 2 shows the second embodiment, of which (a) is a perspective view showing the overall schematic structure, and (b) is an elevational sectional view. , FIGS. 3 to 5 are elevational cross-sectional views showing the overall schematic configurations of the third to fifth embodiments, respectively. -]l- A, B, C, D, E... Fish reef (artificial fish reef), 4.
8...Space, 3.7...''1 board, 6...
・Side plate, 12 ・・Heat pipe (heating means), 14・
... Heating means, 16 ... Solar cell, 18
... Heater, 19 ... Heating means, 21
...Solar water heater.

Claims (6)

[Claims] (1) An artificial reef that is used submerged in water and has a space inside for fish and shellfish to live in, characterized in that the upper part of the space is closed. (2) The artificial reef according to claim 1, wherein a part of the side of the space is closed. (3) In an artificial reef that is submerged in water and has a space inside for fish and shellfish to live in, at least the upper part of the space is closed and the water in this space is heated. An artificial fish reef characterized by being equipped with heating means. (4) The artificial reef according to claim 3, wherein the heating means is constituted by a heat pipe that transfers geothermal heat in the underwater ground into the space. (5) The artificial reef according to claim 3, wherein the heating means is configured to energize a heater arranged in the space by a solar cell arranged on the water surface. (6) The artificial reef according to claim 3, wherein the heating means is configured to guide hot water obtained by a solar water heater placed on the water surface into the space. .