JP2001346476A - Artificial fishing bank provided with feed culture bank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial fishing bank provided with a feed culture bank capable of growing a feed for useful fishes, effectively gathering fishes, preventing washing away of seashell and breeding polychaetans, small-sized crustaceans, etc., to be a feed for useful fishes for a long period of time. SOLUTION: This artificial fishing bank is equipped with an artificial fishing bank 50 having a space part in the inside and a porous feed culture layer provided with a great number of void parts by mutually integrating a seashell group with a mortar. The artificial fishing bank 50 is constituted of a fishing bank block 30 made of concrete furnished with four supporting legs 32 and a fishing bank frame body 40 of steel structure furnished with four supporting legs 41 to be fixed to the top side of the fishing bank block 30. Plural net baskets 47 composed of net bodies 5 for storing the feed culture layers are arranged on the top side of the fishing bank frame body 40. A space part 60 consists of a space layer at the fishing bank frame body side and a space layer at the fishing bank block side. Consequently the artificial fishing bank comprises the feed culture layer, the space layer at the fishing bank frame body side and the space layer at the fishing bank block side from the upper side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed culture for growing microanimals such as polychaetes and small crustaceans, and for gathering and continuously retaining fish that feed on these microanimals. The present invention relates to an artificial reef with a reef and a feed culture reef.

[0002]

2. Description of the Related Art In general, flowering plants such as eelgrass and koala grow on the sandy seabed in the shallow sea of the inner bay by photosynthesis, and they prosper and form eelgrass beds. Marine organisms such as sea urchins, turtles and abalones attach to such algal beds where eelgrass grows densely, and micro-animals such as polychaete and small crustaceans inhabit the complex space created by seaweeds. Furthermore, various fish that feed on these small animals gather. In particular,
The seaweed bed is a breeding ground for juveniles of useful fish, such as juveniles and juveniles of useful fish such as black porcupines, sea lions, sea bass, and turtles that feed on the aforementioned polychaetes and small crustaceans. As an important function. By the way, as described above, eelgrass and the like grow by photosynthesis, so there is a limit to the water depth suitable for growth, and the seagrass beds where eelgrass grows densely develop only in the relatively shallow coastal waters where the water depth is relatively shallow. For this reason, there is an environment in which it is difficult to establish a breeding ground for fry such as useful fish in a deep water zone. In order to artificially breed useful fish fry in such deep waters, it is necessary to first create an environment in which small animals such as polychaete and small crustaceans that can be used as food are breedable.
Various artificial reefs have been developed for breeding polychaetes, small crustaceans, and the like as feed. For example, JP-A-6-14
No. 1727, JP-B-6-77493, JP-A-7-23
No. 6385, the net is filled with shells such as oysters,
A fish collection case for artificial reefs in which polychaetes and small crustaceans are bred in the gaps between shells has been proposed. However, these fish collection cases simply fill the net with a large number of shells, and in sea areas with fast currents or large waves, the oyster shells filled inside the net will collide with each other and break easily. However, there is a problem that broken oyster shell fragments are washed away from the reticulated body, and the reproduction function of polychaetes, small crustaceans, etc. cannot be maintained for a long period of time.

In Japanese Patent Publication No. 5-48092, a fish collecting case filled with oyster shells and the like is mounted on the upper surface side of a fish reef frame made of a steel framework, and the fish collecting case and the fish collecting case are gathered in the fish collecting case. Artificial reefs that have the function of fish nests have also been proposed.However, as mentioned earlier, in sea areas with fast tides and large waves, the weight of a steel-framed reef frame made of steel is lighter. Therefore, there is a danger of falling due to the wave energy, and such a fall of the artificial reef destroys a weak net in terms of strength, thereby losing the breeding function of food at an early stage.

[0004] The present invention has been made based on the above-mentioned problems, and it is possible to multiply the feed of useful fish to effectively gather fish, and to prevent the loss of shells to prevent the useful fish over a long period of time. It is an object of the present invention to provide an artificial fish reef having a feed culture reef capable of multiplying polychaetes, small crustaceans, and the like, which are used as feed for the fish. Another object of the present invention is to provide an artificial fish reef having a feed culture reef that can stably install a fish reef block on the seabed without falling over against tides and waves.

[0005]

According to the present invention, there is provided an artificial fish reef having a feed culture reef according to claim 1, wherein the artificial fish reef having a space inside the shell and a group of shells are mutually integrated by mortar to form a large number of hollows inside. Comprising a porous feed culture layer with
The artificial reef is composed of a concrete reef block having a plurality of support legs, and a steel reef frame having a steel structure having a plurality of support legs fixed to the upper surface side of the reef block. A plurality of net cages comprising a net for storing the feed culture layer are arranged on the upper surface side of the body, and the space portion is composed of a fish reef frame side space layer and a fish reef block side space layer, and thus has a food culture layer from the upper side. It consists of a reef frame side space layer and a fish reef block side space layer.

[0006] The artificial fish reef having the feed culture reef configured as described above is used to reduce small fish that gather around the feed culture layer by the food grown in the feed culture layer and further collect in the feed culture layer. The benthic fish used as feed continually stays in the space consisting of the reef frame side space layer and the reef block side space layer formed by the reef block and the fish reef frame, and the space of the artificial reef Functions as a breeding area. Also,
Even if artificial reefs are set in deep water where algae are difficult to grow,
The feed culture reef is raised by the fish reef block and the fish reef frame, and the food culture layer can be maintained in a deep water zone suitable for the growth of algae. It functions as a breeding seaweed bed. Furthermore, by combining different materials such as a concrete reef block and a steel reef frame made of steel, a weight that can withstand wave energy can be secured, and the center of gravity of the artificial reef is stabilized by the reef block located at the bottom,
The artificial reef can be installed in a stable state for a long time without overturning even in the sea area where the tide is fast or the sea area is large,
It is also possible to prevent the destruction of the net cage due to the fall of the artificial reef. Also,
By integrating the shells housed in the net basket with mortar, it is possible to prevent the shells from being washed away due to tides and waves, to be robust for a long period of time, and to maintain the mechanism as a feed culture layer.

According to a second aspect of the present invention, there is provided an artificial fish reef having a feed culture reef according to the first aspect, wherein the fish reef block is formed into a frame-shaped top plate block and a plurality of supports integrated by the top plate block. The fish reef frame comprises a top end formed in a frame shape and a plurality of support legs integrated by the top end, and the support leg of the fish reef frame is provided on the top surface of the top plate block. It is fixed to the side. By fixing the reef frame to the upper surface side of the top plate block at the support leg in this way, a space formed inside the support leg of the fish reef block and the inside of the support leg of the fish reef frame are formed. By communicating with the space, a space composed of the fish reef frame side space layer and the fish reef block side space layer can be formed.

According to a third aspect of the present invention, there is provided an artificial fish reef provided with a feed culture reef, wherein a plurality of storage frames for positioning the net basket are provided on an upper surface side of the fish reef frame.
These housing frames are interconnected and integrated, and at least an opening communicating with the space is provided inside each housing frame.

[0009] The artificial fish reef provided with the feed culture reef configured as described above allows the net basket to be easily assembled to the artificial fish reef. In addition, fish gathering on the feed culture reef can migrate in the space of the artificial reef through the opening, and the fish nest function of the artificial reef is enhanced.

[0010] Further, in the artificial reef provided with the feed culture reef according to claim 4, the artificial fish reef according to any one of claims 1 to 3, wherein the plurality of net cages are positioned on the upper surface side of the fish reef frame. The housing frame is provided so as to protrude outward from the top end of the fish reef frame. For this reason, the fish can be effectively gathered by multiplying the feed of useful fish.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail. FIGS. 1 to 3 show an artificial reef provided with a food culture reef according to a first embodiment of the present invention. In this embodiment, an artificial reef comprising a fish reef block 30 made of concrete and a fish reef frame 40 having a steel structure. Feed culture reef 1 is attached to 50. The reef block 30 in this embodiment is
As shown in FIG. 1, a cylindrical block 31 is arranged in the center,
Four support legs 32 formed in an inverted U-shape so as to be orthogonal to each other on the outer peripheral surface of the cylindrical block 31 are radially connected to each other, and the support legs 32 are formed in a cross shape on the peripheral portion of the cylindrical block 31. These support legs 32 are integrated by a top plate block 33 formed in a rectangular frame shape. Then, the fish reef frame body 40 is fixed to the upper surface side of the top plate block 33 with anchor bolts 40A. The reef frame 40 has four supporting legs 41 made of steel.
And a rectangular frame-shaped top end 42 for integrally integrating the support legs 41 with each other.
The structure is such that 41 and the top end 42 are connected by an inclined reinforcing steel frame 43. Further, the cylindrical block 31 disposed at the center of the fish reef block 30 is formed in a hollow shape, and by filling the inside of the cylindrical block 31 with concrete 45, the total weight of the artificial reef 50 is adjusted. I have to.

On the upper surface side of the top end 42 of the fish reef frame 40, a storage frame 46 for mounting the feed culture reef 1 is fixed so as to protrude outward from the top end 42.
A net basket 47 constituted by the net 5 is stored in the inside of 46. Inside the net basket 47, a feed culture layer (not shown) composed of a large number of oyster shells integrated by mortar is stored.
The housing frames 46 are fixed to the center of one side of the top end 42, respectively, and a total of four housing frames 46 are fixed to the top end 42. Further, four housing frames 46 are provided inside each of the housing frames 46. Net basket 47
Is stored. That is, in this embodiment, four net baskets each containing an integrated oyster shell (not shown)
47 is assembled into a housing frame 46 to form a unit, and the housing frame 46
Are assembled to form a feed culture reef 1 for breeding the feed. Also, four housing frames 46 fixed to the top end 42 are provided.
Are connected in a cross shape in such a manner that both inner corners of each of the storage frames 46 are joined to each other, and the storage frames 46 thus integrated are connected.
Further, an adjacent corner of the housing frame 46 fixed to the top end 42 and the support leg 41 are integrally connected by a reinforcing steel frame 48. Then, by connecting the respective housing frames 46 in a cross shape in this manner, an opening 51 is formed in which the central portion of each of the housing frames 46 is removed, and further, the opening 51 is located at the four corners of the peripheral edge of the top end portion 42. Square opening surrounded by top end 42 and each storage frame 46
52 are formed. Each of these openings 51, 52 is a fish reef block
30 and a space 60 formed inside the fish reef frame 40. The net basket 47 for storing the integrated oyster shell (not shown) has a depth of 500 mm and a width and length of 750 m.
m, and the upper surface is closed by the net lid 53 without opening. Also, four net cages 47 accommodated in each accommodation frame 46
Are fixed to the four corners of each storage frame 46, and a partition frame 55 for positioning each net basket 47 is provided inside each storage frame 46. In the drawing, reference numeral 61 denotes a hook for hooking a wire rope 62 when the fish reef block 30 is submerged, and is fixed to the upper surface side of each support leg 32.

In this embodiment constructed as described above, a large number of oyster shells are housed in a net basket 47 and closed with a net lid 52 and then integrated with a mortar or integrated with a mortar in advance. After storing the oyster shells in the net basket 47, the net basket 47 is put on the net lid 52.
Close with. Then, as shown in FIG. 4, a complicated raised portion 20 is formed on the surface of the feed culture layer 15 stored inside the mesh basket 47, and a large number of hollow portions 21 are formed in the gaps between the shells 16. It is formed porous by these hollow portions 21. In this case, since the hollow portions 21 between the shells 16 do not have regularity in arrangement, shape, size, etc., the inside of the porous food culture layer 15 has a complicated and complicated maze shape. . Therefore, by fixing such a net cage 47 to the storage frame 46 attached to the fish reef frame body 40, a porous food culture layer having a large number of hollow portions inside is formed into an artificial fish reef.
Formed above 50. Also, before the artificial reef 50 is submerged, the cylindrical block 31 is filled with concrete 45 in accordance with the speed of the tidal current in the sea area where the artificial reef 50 is to be installed and the size of the waves, thereby reducing the weight of the artificial reef 50. adjust. Then, a wire rope is inserted into the opening 51 formed between the housing frames 46.
An artificial reef 50 is lifted by hooking a wire rope 62 on a hook 61 attached to a supporting leg 32 through 61, and the artificial reef 50 is laid down in a predetermined sea area. The artificial reef 50 in which the fish culture reef 1 is attached to the fish reef block 30 and the fish reef frame 40 is submerged on the seabed, so that polychaetes, small crustaceans, and the like are proliferated in the food culture layer 15 and are useful as food. Fish fry gather around the feed reef 1. Further, in this embodiment, the housing frames 46 accommodating the four net cages 47 are connected in a cross shape, and a plurality of net baskets 47 are gathered to form a feed culture layer by the feed culture reef 1. Since the space 60 composed of the fish reef frame side space layer and the fish reef block side space layer is formed on the lower side, more fish gather around the feed culture reef 1 and these small fish are used as food. The large benthic fish that mainly live near the seabed gather. Various fish gathering around the feed culture reef 1 continuously stay in the space 60 formed inside the artificial reef 50, and the space 60 functions as a fish breeding area. Further, in the present embodiment, the housing frame 46 for housing the feed culture reef 1 is not arranged so as to close the opening of the top end portion 42, but is connected in a cross shape so that the housing frame 46 Openings 51, 52 communicating with the space 60 are formed inside and at the four corners of the top end 42, and fish can swim through these openings 51, 52, and the reef effect of the artificial reef 50 can be enhanced. .

Further, it is assumed that the feed culture reef 1 serving as a feed culture layer is raised by the support legs 32 of the fish reef block 30 and the support legs 41 of the fish reef frame 40, and the fish reef block 30 is sunk in a deep water zone where algae cannot grow easily. Also, the feed culture layer supported by the support legs 32 and 41 can be maintained in a deep water zone suitable for algae growth. For this reason, algae can be formed on the feed culture layer, and algae beds can be created, and the breeding environment for useful fish such as fry can be expanded.

The artificial reef 50 is composed of a combination of different materials, such as a reef block 30 made of concrete and a reef frame 40 made of steel, so that a weight that can withstand wave energy can be ensured and the concrete reef 50 located on the lower side is provided. The reef block 30 stabilizes the center of gravity of the artificial reef 50, and even if the reef block 30 is sunk in a sea area where the tide is fast or in a large wave, the fish reef block 30 does not move or stabilize for a long time without falling over Can be installed in a state. In addition, by integrating the shells housed in the net basket 47 with mortar, it is possible to prevent the shells from being washed away due to tides and waves, and as described above, the net basket 47 is damaged by the falling of the reef block 30. Because there is no
It has a robust structure for a long time, and can maintain the mechanism as the feed culture layer 15. Further, the weight of the entire artificial reef 40 can be easily adjusted according to the sea area where the reef block 30 is installed, the tidal current, and the waves in the area by the amount of the concrete 45 filled in the cylindrical block 31.

FIGS. 5 and 6 show a second embodiment of the present invention, in which parts having the same functions as those of the first embodiment are denoted by the same reference numerals, and the description of the overlapping parts will be omitted, and different parts will be omitted. Will be described only.

In this embodiment, a storage frame 65 is further disposed above the storage frame 46 connected in a cross shape, and the two upper and lower feed culture layers 15 are arranged on the artificial reef 40 in a stacked state. In addition,
The storage frame 65 located at the upper part is fixed to a support frame 66 erected from a peripheral edge of the opening 51 which is an intersection of the storage frames 46. That is, the upper housing frame 65 is
Each of the storage frames fixed to close the opening 51 formed inside each of the storage frames 46 at an interval and connected in a cross shape
The storage frame 46 and the storage frame 65 located above each of the storage frames 46 are arranged in a step shape without overlapping. Therefore, in the present embodiment, by increasing the number of the storage frames 65, the food can be more efficiently proliferated, and the effect of gathering fish can be enhanced. Moreover, a space 67 is formed by the support frame 66 between each of the storage frames 46 connected in a cross shape and the storage frame 65 located on the upper side, and not only the space 60 of the artificial reef 40 but also the upper and lower A space 67 can be formed between the frames 46 and 66 as a fish breeding area.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments,
Various modifications can be made within the scope of the present invention.
For example, the material and shape of the storage basket and the net basket in each embodiment,
The basic structure such as external dimensions may be appropriately selected. Also, oysters are illustrated as shells to be filled in the storage basket, but not limited to oysters, and various shells such as turban shells and scallops may be used. Further, instead of filling the shell of a single shell, a plurality of shells may be filled in the storage basket and integrated. Also, in the first embodiment, an example is shown in which four storage frames attached to the artificial reef are connected in a radial cross shape, but three storage frames are radially connected or six storage frames are radially connected, A triangular or hexagonal opening may be formed inside these storage frames, and the number and arrangement of the storage frames or the number and arrangement of the net cages stored in the storage frames are also limited to those in the above embodiment. is not.

[0019]

According to the first aspect of the present invention, there is provided an artificial fish reef having a feed culture reef, and an artificial fish reef having a space therein, and a porous body having a large number of cavities therein by integrally integrating shells with a mortar. Comprising a bait culture layer in the form of, wherein the artificial reef is a fish reef block made of concrete with a plurality of support legs,
A plurality of nets each comprising a fish reef frame having a steel structure having a plurality of support legs fixed to the upper surface side of the fish reef block, and a net for storing the feed culture layer on the upper surface side of the fish reef frame. The baskets are arranged, and the space part is composed of a fish reef frame-side space layer and a fish reef block-side space layer, and is thus composed of a feed culture layer, a fish reef frame-side space layer, and a fish reef block-side space layer from the upper side. Fish reefs formed by fish reef blocks and fish reef frames, with small fish gathering around the food culture layer due to the food multiplied in the food culture layer, and with the small fish gathering in the food culture layer as feed. It continuously stays in the space composed of the frame side space layer and the fish reef block side space layer, and the space part of the artificial reef functions as a fish breeding area.
Also, even if the artificial reef is submerged in a deep water zone where algae cannot grow, the food culture reef will be raised by the fish reef block and the fish reef frame, and the food culture layer will be maintained in a water depth suitable for the growth of algae. Since it can be formed, algae grow on the feed culture layer and function as a seaweed bed where useful fish fry and the like breed. Furthermore, by combining different types of materials such as concrete reef blocks and steel reef frames, it is possible to secure a weight that can withstand wave energy,
The center of gravity of the artificial reef is stabilized by the fish reef block located on the lower side, and the artificial reef can be installed in a stable state for a long period of time without falling over in the sea area where the tide is fast or the sea is large, and the net cage due to the fall of the artificial reef Can be prevented from being destroyed. In addition, by integrating the shells housed in the net basket with mortar, it is possible to prevent the shells from being washed away due to tides and waves, to be robust for a long period of time, and to maintain the mechanism as a feed culture layer.

According to a second aspect of the present invention, there is provided an artificial fish reef having a feed culture reef according to the first aspect, wherein the fish reef block is formed into a frame-shaped top plate block and a plurality of support members integrated by the top plate block. The fish reef frame comprises a top end formed in a frame shape and a plurality of support legs integrated by the top end, and the support leg of the fish reef frame is provided on the top surface of the top plate block. Side, so that the space formed inside the support leg of the reef block and the space formed inside the support leg of the fish reef frame communicate with each other, so that the reef frame side space layer and It is possible to form a space composed of the fish reef block side space layer.

In the artificial fish reef provided with the feed culture reef according to the third aspect, in the first or second aspect, a plurality of storage frames for positioning the net basket are provided on the upper surface side of the fish reef frame. Since the housing frames are interconnected and integrated, and at least an opening communicating with the space is provided inside each housing frame, more fish can be gathered around the feed culture reef. ing.

Further, in the artificial fish reef provided with the feed culture reef according to claim 4, the artificial fish reef according to any one of claims 1 to 3, wherein the plurality of net cages are positioned on the upper surface side of the fish reef frame. Since the storage frame is provided so as to protrude outward from the top end of the fish reef frame, the food of useful fish can be multiplied and fish can be gathered effectively.

[Brief description of the drawings]

FIG. 1 is a perspective view of an artificial fish reef having a feed culture reef showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the artificial fish reef provided with the feed culture reef.

FIG. 3 is a plan view of the artificial fish reef provided with the feed culture reef.

FIG. 4 is an enlarged front view of a part of the feed culture layer.

FIG. 5 is a perspective view of an artificial reef having a feed culture reef according to a second embodiment of the present invention.

FIG. 6 is a partially cutaway front view of the artificial fish reef having the feed culture reef.

[Explanation of symbols]

 1 Feeding culture reef 30 Fish reef block 40 Fish reef frame 46,65 Storage frame 47 Net basket 50 Artificial reef 51,52 Opening 60,67 Space

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masaki Taniyama 1-111-506, Sorimachi, Kanagawa-ku, Yokohama-shi, Kanagawa F-term (reference) 2B003 AA01 BB03 BB08 DD01 DD08

Claims (4)

[Claims] An artificial fish reef having an artificial fish reef having a space therein, and a porous food culture layer having a plurality of cavities formed by integrating shells with each other by mortar. A reef block made of concrete having a plurality of supporting legs, and a reef frame having a steel structure having a plurality of supporting legs fixed to an upper surface of the reef block. A plurality of net cages comprising a net for storing the feed culture layer are arranged, and the space portion is composed of a fish reef frame side space layer and a fish reef block side space layer, and thus the food culture layer and the fish reef frame side space from the upper side. An artificial reef having a feed culture reef, comprising a layer and a fish reef block side spatial layer. 2. A top end portion in which the fish reef block is formed of a frame-shaped top plate block and a plurality of support legs integrated by the top plate block, and wherein the fish reef frame is formed in a frame shape. And a plurality of support legs integrated by the top end, wherein the support legs of the fish reef frame are fixed to the upper surface side of the top plate block. Equipped artificial reef. 3. A plurality of storage frames for positioning the net cage are provided on the upper surface side of the fish reef frame body, these storage frames are interconnected and integrated, and the space is provided at least inside each of the storage frames. An artificial fish reef provided with the feed culture reef according to claim 1 or 2, wherein an opening communicating with the portion is provided. 4. A plurality of storage frames for positioning said net cage on an upper surface side of said fish reef frame, and are provided so as to protrude outward from a top end of said fish reef frame. An artificial fish reef comprising the feed culture reef according to any one of the above.