JP5963429B2 - Underwater installation structure and aquatic organism propagation method - Google Patents

Description

The present invention is installed in the bottom of the water or between the bottom and the surface of the water (generally referred to as “underwater”) for the purpose of propagation of aquatic organisms such as seafood, planktons, algae, seaweeds, and leafy organisms. relate to that water installed structure.

A typical example of this type of structure is an artificial reef. Artificial fish reefs include structures such as concrete blocks and abandoned boats that are submerged in the sea floor to serve as fish dwellings, and sinking natural waste materials such as thinned wood to release nutrients from the artificial reefs into the water, algae, etc. Some lichens promote the formation of fish nests and the establishment of a school of fish.
As an example of the former artificial fish reef, the thing of patent document 1 can be mentioned, for example.

This artificial fish reef is made up of concrete hollow blocks, and seaweed seedlings are planted on its surface, and natural rocks and shells are mixed or pasted on the concrete material.
Examples of the latter artificial reef include those described in Patent Document 2 and Patent Document 3. The artificial fish reef described in Patent Document 2 is a concrete reef described in Patent Document 3, which is a mixed reef of rubble-thinned-thinned material in which rubble is housed in a frame made by cross-connecting thinned timber in multiple stages. Is one in which a nutrient component is supported on concrete so that the nutrient component gradually elutes from the structure.

Noto 3092961 (see FIG. 8) JP 2002-218861 A JP-A-2005-341887

By the way, the latter artificial fishing reef is advantageous to the former artificial fishing reef in that the nutritional component is released to compensate for the nutritional deficiency in the seawater and to breed the target aquatic organism. However, since the conventional artificial fish reef described above releases or diffuses nutrient components using the flow of water such as tidal currents, there is a problem that the nutrient components are lost early and the fishing effect is reduced. There is. Therefore, it is necessary to replace the artificial reef itself or replenish nutrients, but it is necessary to lift the artificial reef or work by diving work, so there is a problem that the cost and work burden are large .
In addition, nutrient components may diffuse over a wide range due to the flow of water such as tidal currents, which also has the problem that the fishing effect is reduced.

  The present invention has been made to solve the above-described problems, and can release nutrient components over a long period of time. By constantly retaining a certain amount of nutrient components in a certain region, the intended water tank An object of the present invention is to provide an underwater installation structure that can stably establish living organisms, maintain a high concentration of fish over a long period of time, and can be easily supplemented with nutrients.

  As a result of intensive research by the inventors of the present invention, a liquid or semi-liquid nutrient component having a specific gravity greater than that of the surrounding water is contained in the substrate in a sealed state, and the nutrient component is converted into the substrate by the natural diffusion action of the nutrient component. It has been conceived that the above problem can be solved by discharging from the discharge part.

That is, the invention according to claim 1 is an underwater installation structure that is installed in water for the purpose of aquatic organism growth, and a substrate installed in the water and provided on the substrate and having a specific gravity higher than that of surrounding water. A housing part that contains a large nutrient component and is shielded except for the discharge part so that the nutrient component housed from other than the discharge part is not dispersed in water, and disturbs the surface of the nutrient component or the nutrient A water flow suppression unit that suppresses the generation of a water flow that stirs the components, the discharge unit is formed on a ceiling portion of the housing unit, and the water flow suppression unit is provided on a ceiling side of the storage unit. A shielding body that surrounds the discharge portion and shields the water flow and retains the nutrient component released from the discharge portion is formed therein, and the shielding body is formed on the side wall and Necessary range for aquatic life In some configured to have a size of holes or gaps to allow ingress and egress of water, and a pore size of the formed in the ceiling portion of the shield aquatic organisms can enter and exit. The invention according to claim 2 is an underwater installation structure installed in water for the purpose of aquatic organism growth, and a substrate installed in the water and a nutrient having a specific gravity greater than that of surrounding water. And containing the ingredients, and containing the nutrients contained from other than the release part so as not to be dispersed in the water, except for the release part, and shielding the formed nutrition part, A water flow suppression unit that suppresses the generation of water flow to be stirred, and the discharge unit is formed on a ceiling portion of the storage unit, and the water flow suppression unit is provided on a ceiling side of the storage unit, It surrounds the discharge part to shield the water flow and includes a brush-like shield formed on the inside of the retention part for retaining the nutrient component released from the discharge part. According to a third aspect of the present invention, a biological carrier for promoting the propagation and establishment of the aquatic organisms may be provided on the surface of the water flow suppression unit or the inner region of the water flow suppression unit.

Examples of the water flow suppression unit include a shielding plate (wall), a lid provided on the discharge unit, and the like, but the surface of the nutrient component is disturbed or floated on the surface of the nutrient component. You may suppress generation | occurrence | production of the water flow which stirs a component. A float may be floated on the surface of the nutrient component, and as described in claim 4, the float is formed of a component having a specific gravity smaller than that of the nutrient component and greater than that of surrounding water, and floated on the surface of the nutrient component. Thus, a water flow suppression layer that suppresses the generation of water flow that disturbs the surface of the nutrient component or stirs the nutrient component may be used. Such a water flow suppression layer can also more effectively suppress the generation of water flow that disturbs the surface of the nutrient component or stirs the nutrient component.

In order to facilitate the replenishment of the nutrient component to the storage unit, as described in claim 5 , a replenishment unit communicating with the interior of the storage unit and a lid for opening and closing the replenishment unit may be provided. Since the nutrient component has a specific gravity greater than that of the surrounding water, the replenishment operation can be easily performed even in the water simply by pouring from the replenishment unit, and it is also possible to pour the nutrient component into the storage unit from the ship or on land using a hose.

According to a sixth aspect of the present invention, the discharge part may be provided with a cylinder projecting from the housing part, and the nutrient component may be discharged from an opening of the cylinder.

As described in claim 7, it is preferable to provide a biological carrier in this staying portion. Ribbon-like, strip-like or brush-like forms can be used as the form of the organism carrier, and the breeding and establishment of aquatic organisms can be promoted by hanging, standing or laying. .
As described in claim 8 , a thickener may be added to the nutritional component to suppress the stirring action by the water flow. In this case, as described in claim 9 , the stirring suppression means may be configured by a partition member provided in the housing portion. Moreover, when using organic nutrients, such as an amino acid, it is preferable to mix an anti-corruption agent with the said nutrient component as described in Claim 10 .

According to the present invention, the nutrient component having a specific gravity greater than that of the surrounding water is accommodated in the accommodating portion, and the nutrient component is naturally prevented by preventing the surface of the accommodated nutrient component from being disturbed or stirred by the water flow. It is gradually released from the discharge part by the diffusion action of. Therefore, it is possible to have the nutritional component stored in the storage unit for a long period of time, and it is not necessary to replenish or replace frequently. In addition, by allowing the released nutrient components to stay around the underwater installation structure, the breeding and establishment of aquatic organisms can be stably maintained over a long period of time.
Furthermore, supplementation of nutrient components can be performed relatively easily from the ship or on land, so that the burden on the operator can be reduced and supplementation can be performed at low cost.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[First embodiment]
FIG. 1 is an exploded perspective view illustrating the configuration according to the first embodiment of the underwater installation structure of the present invention.
The underwater installation structure 1 includes a base body 11 that contains nutritional components and is installed at the bottom of the water, a cylindrical shield 14 placed on the base body 11, and a biological carrier that is stored inside the shield body 14. It is roughly composed of a body 16.

[Substrate]
As shown in FIG. 1, the base body 11 is provided in a box-shaped base body 110 having a storage portion 111 for storing a nutrient component and a ceiling portion of the storage portion 111, and the nutrient component stored in the storage portion 111 is submerged in water. And a ceiling portion 112 that suppresses it from being dispersed.
The ceiling portion 112 is formed with one or a plurality of (four in the illustrated example) discharge holes 113 inside the region where the shield 14 is installed (the region indicated by the two-dot chain line in FIG. 1). Has been. The discharge hole 113 communicates with the storage portion 111 so that the nutrient components in the storage portion 111 can be discharged into water.
In this embodiment, the nutrient component may be replenished from the discharge hole 113. However, in this embodiment, the supplementary hole 114 for supplementing nutrients to a region of the ceiling 112 that does not interfere with the shield 14 outside the region. And can be opened and closed by a lid 115.

The base 11 can be formed of concrete, stone, wood, resin, metal, or the like. When the base 11 is installed on the bottom of the water, it is preferably formed of concrete or stone having a large specific gravity in order to enhance stability.
Of course, the base body 11 may be formed of metal, resin, or wood. However, when the base body 11 is formed of resin or wood, it is preferably fixed to the bottom of the water with an anchor or attached with a ballast so that the base body 11 does not flow.
Moreover, in order to prevent corrosion and deterioration of the base | substrate 11 by the accommodated nutrient component, and the leakage of a nutrient component, the inner wall of the accommodating part 111 may be given a resin coating etc., or the separate body formed with resin etc. You may make it fit this container inside the accommodating part 111. FIG.

[Shield]
The shield 14 has a purpose of suppressing the generation of a water flow in the vicinity of the discharge hole 113 of the base 11 and the discharge hole 113 so that nutrient components are naturally released from the housing portion 111 without depending on the water flow. It is installed on the substrate 11 for the purpose of accelerating the generation of algae and the incentive of fish by retaining the released nutrient components in a certain region.
The shield 14 includes a cylindrical shield body 140 that is open at both upper and lower ends, and a top plate 141 that closes the upper opening of the shield body 140.
A hole 143 is formed in the top plate 141 so that aquatic organisms such as fish can enter and exit, and a plurality of holes 142 through which a water flow can enter and exit are formed around the shield body 140.

In the illustrated example, one relatively large square hole 143 is formed in the top plate 141. However, the hole 143 has a size and shape that allows aquatic organisms to enter and exit. Good.
For example, a plurality of small circular holes 143 may be formed in the top plate 141, and the holes 143 may not be formed in the top plate 141 as long as aquatic organisms can enter and exit from the holes 142.
Further, if no water flow is generated around the discharge hole 113 of the base 11, the top plate 141 is not particularly required.

The hole 142 is formed mainly for the purpose of introducing a water flow necessary for aquatic life to the shield body 140. As long as this purpose can be achieved, the size and shape of the hole 142 and the arrangement position in the shield body 140 are not limited. However, as long as possible, a material that does not cause a water flow around the discharge hole 113 of the base body 11 is selected.
If the object can be achieved, for example, the shape of the hole 143 may be a slit-like shape formed in the vertical direction as in the illustrated example, or may be a round hole shape or a square hole shape. May be. Further, if this purpose can be achieved by the hole 143 of the top plate 141, the hole 142 may not be provided.

[Biological support]
The organism carrier 16 is provided for the purpose of assisting the retention of nutrient components in the shield body 140 and promoting the propagation and establishment of aquatic organisms.
In this embodiment, the biological carrier 16 includes a support member 162 fixed in the shield body 140 and a ribbon-like, brush-like or strip-like suspension member 161 suspended from the support member 162. . A contact prevention member may be appropriately interposed between the suspension members 161 and 161 so that adjacent suspension members 161 do not contact each other.

The suspension member 161 is preferably selected from a material that is easy to generate and settle aquatic organisms such as algae and seaweeds, and examples thereof include fibers and resins having a large number of irregularities on the surface. As a material of this kind of fiber or resin, those generally used for artificial fish reef can be used. For example, a bioadhesive resin composition as described in JP 09-118775 A is used. It may be used.
For example, seeds such as algae and seaweeds to be generated may be planted in the suspension member 161 in advance.

[Nutrition ingredients]
As a nutrient ingredient used for underwater installation structure 1 of the present invention of the above-mentioned composition, a liquid or semi-liquid inorganic nutrient and organic nutrient can be used. The specific gravity of this nutrient component is preferably slightly larger than that of the surrounding water, and is preferably about 1.05 to 1.3. If the specific gravity is smaller than this, the nutritional components are diffused and released at an early stage. If the specific gravity is larger than this, the nutritional components are not easily diffused and the fish collection effect cannot be enhanced.

An inorganic nutrient salt or useful organic matter obtained by adding an inorganic salt or an organic salt to these inorganic nutrients or organic nutrients may be used as a nutrient component.
By adding an inorganic salt or an organic salt, the decay of organic nutrients such as amino acids can be delayed. For example, by adding about 10 to 30% by weight, preferably about 20% by weight, of an inorganic salt or useful salt to an amino acid, the decay of nutrient components can be delayed by about one year.

Since the nutrient component has a specific gravity greater than that of water (including seawater), the nutrient component can be poured into the accommodating portion 111 from the replenishment hole 114 in water. Further, since the specific gravity is larger than that of water, the nutrient component accumulates at the bottom in the accommodating portion 111 and the water flow around the discharge hole 113 is suppressed, so that the nutrient component is gradually released from the surface by natural action. 113 is released into the shield body 140.
Furthermore, by adding alginic acid, gelling agent, agar, etc. to increase the viscosity, the influence of stirring by the water flow can be reduced, and the release of nutrients from the release holes 113 by natural diffusion can be facilitated. it can.

[Action]
The operation of the underwater installation structure 1 of the present invention having the above configuration will be described with reference to FIG.
FIG. 2 is a cross-sectional view when the underwater installation structure of FIG. 1 is installed on the bottom of the water.
Since the nutrient component N has a specific gravity greater than that of the surrounding water, the nutrient component N can be introduced into the accommodating portion 111 from the replenishment hole 114 in water, or can be introduced from the ship or on land by connecting a hose to the replenishment hole 114. .
Although water is in contact with the surface of the nutrient component N accommodated in the accommodating portion 111, the water flow is shielded by the shield 14 placed on the discharge hole 113, and the surface of the nutrient component N is disturbed. Nutritional ingredients are not agitated. Therefore, the nutrient component N is gradually released from the release hole 113 into the shield body 140 due to the spontaneous release action. The nutrient component N released into the shield body 140 stays inside the shield body 140 by adhering to the suspension member 161 of the biological carrier 16 or floating between the suspension members 161. In addition, generation of algae and seaweeds and establishment of the suspension member 161 are promoted. Thereby, fish gather around the underwater installation structure 1, and a fish nest and a school of fish are formed.
Since the nutrient component N continues to be released from the housing portion 111 over a long period of time, the above action is maintained over a long period of time, and the fish nest and the school of fish are fixed around and inside the underwater installation structure 1.

[Second Embodiment]
Next, an underwater installation structure 1 ′ according to the second embodiment of the present invention will be described with reference to FIG. 3. FIG. 3 is a cross-sectional view when the underwater installation structure is installed on the bottom of the water according to the second embodiment of the present invention. In FIG. 3, the same portions and the same portions as those of the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The underwater installation structure 1 ′ of the second embodiment is different from the underwater installation structure 1 of the first embodiment in that a cylindrical discharge cylinder 117 is provided in the discharge hole 113 of the ceiling portion 112. The cover 118 is covered so as to wrap the opening portion of the discharge cylinder 117. A gap is formed between the cover 118 and the opening of the discharge cylinder 117, and the nutrient component N is released into the shield body 140 through this gap.

By adopting such a configuration, the influence of the water flow can be further suppressed, and the underwater installation structure 1 ′ of the present invention is also installed in water with a fast tide or water flow to promote the propagation of algae, seaweeds, etc. Fish nests and school of fish can be established.
In this embodiment, the replenishment port 114 is provided with a conducting tube 119 extending to the bottom of the storage unit 111, and fresh nutritional component N is introduced from the replenishment port 114 under the old nutritional component N in the storage unit 111. It has come to be. By doing in this way, promotion of the decay of the fresh nutrient component N by a part of the old nutrient component N remaining in the accommodating part 111 can be suppressed.

[Third embodiment]
Next, an underwater installation structure 1 ″ according to the third embodiment of the present invention will be described with reference to FIG. 4. FIG. 4 (a) shows an underwater installation according to the third embodiment of the present invention. Fig. 4B is a plan view of the partition wall when the structure is installed on the bottom of the water, and in Fig. 4, the same portions and the same portions as those of the embodiment of Fig. 1 are denoted by the same reference numerals and detailed description is given. Is omitted.

  The difference between the underwater installation structure 1 ″ of the third embodiment and the underwater installation structure 1 of the first embodiment is that a plurality of layers of partition walls 120 are provided in the vertical direction in the housing portion 111. The partition 120 suppresses the surface of the nutrient component N from being disturbed or stirred by the influence of the water flow in the housing portion 111, and the release hole 113 is released by spontaneous release as much as possible. Provided to be released from the

As shown in the plan view of FIG. 4 (b), the partition wall 120 is formed with a plurality of holes 120a, or the partition wall 120 is formed of a mesh-like member so that the contact area between the nutrient component N and water exceeds a certain level. To maintain.
By adopting such a configuration, the influence of the water flow can be further suppressed, and the underwater installation structure 1 ″ of the present invention can be installed even in water with a fast tide or water flow to promote the propagation of algae, seaweeds, etc. Fish nests and school of fish can be established.

  In addition, a higher water flow suppression effect can be obtained by combining the discharge cylinder 117 and the cover 118 of the second embodiment. Further, the partition wall is not limited to the horizontal direction as shown in FIG. 4 and may be provided in the vertical direction.

[Fourth embodiment]
Next, an underwater installation structure 2 according to a fourth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 5A, in this embodiment, a bottomed cylindrical storage cylinder 24 that stores a nutrient component N is stored in a base body 21 that is formed in a box shape or a frame shape. In the illustrated example, the number of the accommodating cylinders 24 accommodated in the base body 21 is six, but the number may be other than this.

Nutrient components are released from the opening 24 a of the storage cylinder 24, but a cover 25 in which the diameter of the opening 25 a is appropriately adjusted may be attached to the upper end of the storage cylinder 24 in order to adjust the discharge amount.
In this embodiment, the nutrient component is replenished from the opening 24 a of the storage cylinder 24.
In FIG. 5, for convenience of illustration, a part is omitted, but in this embodiment, a brush-like shield 24 is provided on the upper portion of the base 21 in order to suppress the water flow around the opening 24a. It arrange | positions so that the opening 24a may be surrounded. And generation | occurrence | production of algae, a seaweed, etc. is accelerated | stimulated because the inner side of the shield 24 becomes a retention part which retains the released nutrient component.

Also in this embodiment, a biological carrier may be provided in the shield 24. However, when the shield 24 is formed as a brush, strip, or ribbon as shown in the figure. Alternatively, these surfaces may be used as a biological support.
Moreover, as shown in FIG.5 (b), the water flow suppression layer Na is floated on the surface of the nutrient component N accommodated in the accommodation cylinder 24 by floating the material whose specific gravity is smaller than the nutrient component N and larger than the surrounding water. May be formed. The water flow suppression layer Na is formed of an oil and fat component or the like, and the nutrient component N is diffused into the water from the opening 24a through a gap or a hole such as a tear formed in the water flow suppression layer Na while infiltrating or passing through the water flow suppression layer Na. The It is possible to suppress the surface disturbance and stirring of the nutrient component N that forms such a water flow suppression layer Na. Such water flow suppression means Na also acts as stirring suppression means.

[Fifth embodiment]
Next, an underwater installation structure 3 according to a fifth embodiment of the present invention will be described with reference to FIG.
In FIG. 6, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In this embodiment, a cylindrical shield 34 is attached on the discharge hole 113 of the ceiling portion 112. The shield 34 is formed with a plurality of openings 341 through which nutrient components are released in the upper bottom portion and the peripheral surface portion. Another shield for further suppressing the water flow may be provided around the shield 34.
In this embodiment, aquatic organisms such as algae and seaweeds are easily settled by roughening the surface of the shield 34 or forming irregularities or grooves. That is, in this embodiment, the surface of the shield 34 constitutes a biological carrier.

[Sixth embodiment]
Next, an underwater installation structure 4 according to a sixth embodiment of the present invention will be described with reference to FIG.
In FIG. 7, the same parts and the same members as those of the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The underwater installation structure 4 of this embodiment is configured such that the shield 14 and the biological carrier 16 are removed from the underwater installation structure 1 ′ of the second embodiment, and the biological carrier 46 is laid on the top surface of the ceiling 112. is there.
In the underwater installation structure 4, the side wall 44 of the base body 11 erected around the ceiling portion 112 functions as a shield that suppresses the water flow. Further, the region surrounded by the side wall 44 functions as a retention portion that retains the nutrient components released from the bulging tube 117.
Since the underwater installation structure 4 of this embodiment is small and has a simple configuration, it is suitable for use in a bay or an aquaculture pond where little water flow is generated.

Although a preferred embodiment of the present invention has been described, the present invention is not limited to the above description.
For example, in the above description, the structure installed mainly on the bottom of the water was described as an example, but the underwater installation structure of the present invention is installed in a floating state between the bottom of the water and the surface of the water using an anchor or a float. It is also possible to do.
In addition, although the quadrangular shape is illustrated and described as the basic shape of the underwater installation structure 1, 1 ', 1 ", 2-4, a round shape, an oval shape, a polygonal shape, Various shapes such as an indefinite shape are possible.

Furthermore, the organism carrier 16 is not limited to one suspended from the support member 162, and may be a rod-like or plate-like relatively hard member as long as it can promote the generation and establishment of algae, seaweeds, and the like. These may be erected from the ceiling portion 112 of the base 11 or the wall surface of the shield body 140.
Moreover, each means demonstrated in 1st embodiment-6th embodiment can be combined suitably, for example, the shield 24 of 4th embodiment shown in FIG. 5 is shown in FIGS. It is also possible to provide the substrate 11 of the first to third embodiments, and it is also possible to apply the water flow suppression layer Na shown in FIG. 5 to the nutrient component N of other embodiments. Furthermore, a plate-like or ball-like float may be floated on the surface of the nutrient component N as long as the water flow can be suppressed in a state where it floats on the surface of the nutrient component N in the same manner as the water flow suppression layer Na. . In addition, since these water flow suppression means also perform stirring suppression of a nutrient component, it functions also as stirring suppression means.

Furthermore, the water flow suppression layer Na of FIG. 5B can be implemented independently of the other embodiments in combination with the base body, the accommodating portion, and the discharge port of the other embodiments.
1, 2, 3, 4, 5, and 6 and the cover or lid of FIGS. 3, 5, and 7 can be used as other types of shields, lids, and covers. In addition to the porous material, it is possible to use, for example, a structure in which a plurality of wells as shown in FIG. 8 are assembled, and this surface can be used as a biological carrier.

  The present invention is not limited to fish reefs installed in the sea, rivers, and lakes, but can be widely applied to farms for the purpose of breeding aquatic organisms such as seafood and algae.

It is a disassembled perspective view explaining the structure concerning 1st embodiment of the underwater installation structure of this invention. It is sectional drawing when the underwater installation structure of FIG. 1 is installed in the water bottom. It is sectional drawing when it concerns on 2nd embodiment of this invention and the underwater installation structure is installed in the water bottom. (A) concerning 3rd embodiment of this invention, sectional drawing when an underwater installation structure is installed in a water bottom, (b) is a top view of a partition. FIG. 5A is a perspective view of an underwater installation structure according to a fourth embodiment of the present invention, and FIG. 5B is an enlarged cross-sectional view of a storage cylinder showing an example in which a water flow suppression layer is formed on the surface of a nutrient component. It is a perspective view of an underwater installation structure concerning a fifth embodiment of the present invention. It is sectional drawing of the underwater installation structure concerning 6th embodiment of this invention. It is a perspective view which shows an example of the member which can be used instead of the shield of FIG. 1, 2, 3, 4, 5, 6 or the cover or lid | cover of FIG.

1,1 ′, 1 ″ Underwater installation structure 11 Base body 110 Base body 111 Housing part 112 Ceiling part 113 Release hole 114 Replenishment hole 115 Lid 117 Release cylinder 118 Cover 119 Conducting pipe 120 Bulkhead 14 Shielding body 140 Shielding body main body 141 Top plate 142 hole 143 hole 16 biological carrier 161 suspended body 162 support member N nutrient component Na water flow suppression layer

Claims (10)

Underwater installation structure installed underwater for the purpose of aquatic organism growth,
A substrate installed in water;
A housing portion provided on the base body for containing a nutrient component having a specific gravity greater than that of the surrounding water and shielding the nutrient component housed from other than the discharge portion so as not to be dispersed in the water. When,
A water flow suppression unit that suppresses the generation of water flow that disturbs the surface of the nutrient component or stirs the nutrient component;
Have
The discharge part is formed in a ceiling part of the housing part,
The water flow suppression unit is provided on a ceiling side of the housing unit, and a staying part is formed inside the shield to surround the discharge part and shield the water flow, and to retain the nutrient component released from the discharge part. Including shielding,
This shield is formed in a side wall and has a hole or a gap of a size that allows the flow of water within the range necessary for the aquatic life, and a size that is formed in the ceiling portion of the shield so that the aquatic life can enter and exit. Having a hole,
Underwater installation structure characterized by Underwater installation structure installed underwater for the purpose of aquatic organism growth,
A substrate installed in water;
A housing portion provided on the base body for containing a nutrient component having a specific gravity greater than that of the surrounding water and shielding the nutrient component housed from other than the discharge portion so as not to be dispersed in the water. When,
A water flow suppression unit that suppresses the generation of water flow that disturbs the surface of the nutrient component or stirs the nutrient component;
Have
The discharge part is formed in a ceiling part of the housing part,
The water flow suppressing part is provided on the ceiling side of the housing part, and the staying part that surrounds the discharge part and shields the water flow and retains the nutrient component released from the discharge part is formed inside. Including a brush-like shield ,
Underwater installation structure characterized by 3. The underwater installation structure according to claim 1, wherein a biological carrier for promoting propagation and establishment of the aquatic organisms is provided on a surface of the water flow suppression unit or an inner region of the water flow suppression unit. . It is formed of a component having a specific gravity smaller than that of the nutrient component and greater than that of the surrounding water, and is floated on the surface of the nutrient component, thereby disturbing the surface of the nutrient component or stirring the nutrient component. The underwater installation structure according to any one of claims 1 to 3 , further comprising a water flow suppression layer that suppresses generation. Communicates with the inside of the housing portion, and a replenishment portion for replenishing the nutrient components of the liquid in the accommodating portion, any one of the preceding claims, characterized in that it has a lid for opening and closing the refill unit The underwater installation structure described in 1. The underwater installation according to any one of claims 1 to 5 , wherein the discharge portion is provided with a cylindrical body protruding from the housing portion, and the nutrient component is discharged from an opening of the cylindrical body. Structure. The underwater installation structure according to any one of claims 1 to 6 , wherein a living body support for promoting propagation and establishment of the aquatic organisms is provided in the staying portion. The underwater installation structure according to any one of claims 1 to 7 , wherein a thickener is added to the nutrient component to suppress a stirring action by a water flow. The underwater installation structure according to any one of claims 1 to 8 , wherein a partition wall member that suppresses a stirring action by a water flow is provided in the housing portion. The underwater installation structure according to any one of claims 1 to 9 , wherein an anti-corruption agent is accommodated together with the nutritional component in the accommodating portion.

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