JPH0350682Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to Ishizume fish reefs, and more specifically, to a new type of Ishizume fish reefs that can serve both as food and shelter.

(Prior Art and its Problems) Conventionally, it has been said that the feeding effect plays an important role as one of the factors that attract fish on fish reefs.
Therefore, as a fish reef, for example, a cage-like container with a lot of voids, such as cobblestones, is filled and sunk to the sea floor, and primary and secondary sessile organisms grow, but over time, barnacles and other sessile organisms grow. As the number of primary attached organisms increases, the distance between stones becomes narrower, restricting the flow of seawater and creating a so-called clogging condition. Furthermore, this clogging phenomenon is further accelerated in sea areas where there is drifting sand.

In this way, when the water becomes clogged, it progresses to eutrophication and even overnutrition, which becomes a factor that inhibits the production of food organisms. In other words, the dominant species will change from crustaceans to polychaetes, and polychaetes will also decrease.

(Problems of the invention) The object of the present invention is to eliminate the cause of overnutrition in the above-mentioned Ishizume fish reef, and at the same time provide a new type of Ishizume fish reef that provides food and shelter to fish.

(Means for solving the problem) In view of the fact that the cause of overnutrition in Ishizume fish reefs is the obstruction of seawater flow inside the reef, the present invention is based on the idea that the Ishizume fish reefs are constructed by replacing the Ishizumi chambers in which food is grown with cages. It is placed at the top to allow seawater to flow in from the bottom, while at the bottom there is an ocean current that forms an impact angle θ of 90 degrees or less with respect to the bottom current so that it can convert the bottom current into an upward current. A fish habitat formed by a barrier is installed to promote seawater exchange inside the Ishizume Reef to avoid overnutrition, and at the same time, the space below the Ishizume Reef can be used as a living space for fish. It is characterized by a well-balanced reef.

Such fish reefs will be suspended from the sea using ropes, etc. and installed on the seabed. Therefore, the ocean current direction is known in advance and the ocean current barrier is installed so that it forms a collision angle θ of 90 degrees or less with respect to the ocean current. It is often difficult to position and install ocean current barriers so that they form an angle. Therefore, no matter how it is installed, at least two ocean current barriers 21, 21 are installed so that there is always at least one ocean current barrier 21 having a collision angle θ of 90 degrees or less against ocean currents in all directions. For example, if there are two pieces, make a cross shape,
In the case of three sheets, it is preferable to arrange them so as to intersect each other like a manual shape, and form the fish living room 2 by setting the intersecting angle α between the adjacent walls to 90 degrees or less.

In addition, in consideration of times when the ocean current speed is high during typhoons, etc., in order to obtain an upward current that is sufficient to prevent overnutrition of the Kamigata Ishizume Reef and that does not disturb the structure of the Ishizume Reef. , it is preferable to form an opening 22 in the ocean current barrier 21 to adjust the rising ocean flow rate.

Hereinafter, the present invention will be described in detail based on specific examples shown in the accompanying drawings.

(Example) Fig. 1 is a front view of the Ishizume fish reef for both food and shelter according to the present invention, Fig. 2 is its side view, Fig. 3 is its plan view, and Fig. 4 is its - line cross-sectional view. Fig. 5 is a sectional view taken along the - line, Fig. 6 is a sectional view taken along the - line,
FIG. 7 is a sectional view taken along the - line.

In the drawing, reference numeral 1 denotes a filling chamber, which is located above the fish housing chamber 2 below and is formed as a lattice-like cage, allowing ocean current to flow in from the bottom. On the other hand, the fish living room 2 has a pair of crisscrossing ocean current barriers 21, 21 erected between the upper and lower frame members 20, 20', and a trapezoidal opening 22 is bored in the center of the barrier 21. .

In the stone reef with the above configuration, the upper stone filling chamber 1
When a food growing area is formed by filling the area with boulders, etc., and is installed on the seabed, the ocean current barrier 21 crosses the adjacent wall at an intersecting angle α.
is 90 degrees, and as a result, at least some wall portions form a collision angle θ of 90 degrees or less with respect to ocean floor currents in all directions, and as a result, the ocean currents that collide with the barrier 21 collide at the barrier portions with collision angles of 90 degrees or less. It is converted into an upward flow, flows into the upper stone filling chamber 1, and exchanges seawater between the stones.

(Effects of the invention) As is clear from the above explanation, according to the invention, the bait growing chamber 1, which has a cage shape and allows ocean currents to flow in from the bottom, has a 90° Filling stones are supported in the fish habitat chamber 2 formed by an ocean current barrier 21 that has an impact angle of less than 100 degrees and is capable of converting an impinging ocean current into an upward current toward the upper filling chamber 1, and packed into the filling chamber 1. Since the structure is configured to perform seawater exchange between the chambers 1 and 1, overnutrition is prevented in the upper feed growing chamber 1, and crustaceans that are optimal as feed can be grown. Because it can provide the perfect living space for fish,
This has the advantage of providing new fish reefs that are both food and shelter.

Furthermore, as in the embodiment, if at least two ocean current collision walls 21, 21 are disposed to intersect and the intersection angle α between the adjacent walls is 90 degrees or less, ocean current Since it is possible to provide an ocean current barrier that always has an impingement angle θ of 90 degrees or less, the work of installing fish reefs is significantly simplified.

[Brief explanation of the drawing]

Fig. 1 is a front view of the Ishizume fish reef for both food and shelter according to the present invention, Fig. 2 is its side view, Fig. 3 is its plan view, Fig. 4 is its - line sectional view, and Fig. 5 is Fig. 6 is a - line sectional view of the same.
FIG. 7 is a sectional view taken along the - line. 1... Stone filling room, 2... Fish living room, 21... Ocean current barrier, 22... Opening.

Claims (1)

[Scope of Claim for Utility Model Registration] A cage-shaped stone filling chamber 1 for food growth into which ocean current can flow in from the bottom is formed at an impact angle θ of 90 degrees or less with respect to the ocean floor current, and the impact ocean current is directed upward. It is supported in the fish habitat chamber 2 formed by an ocean current barrier 21 that can be converted into an upward ocean current to the rock filling chamber 1, and configured to exchange seawater between the stones packed in the rock filling chamber 1. Ishizume Reef is characterized by At least two ocean current barriers 21, 21 are provided so that one or more ocean current barriers 21 having a collision angle θ of 90 degrees or less are always provided against ocean currents in all directions.
are arranged intersectingly, and the intersection angle α between the adjacent walls is 90
The stone-filled fish reef as described in the above item, which is less than or equal to The stone-filled fish reef as described in the above item, wherein the ocean current barrier 21 is formed with an opening 22 for adjusting the rising ocean flow rate.