JP2012217390A - Reef for protection and caring of fries - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reef for protection and caring of fries, protecting and caring sedentary fries of Epinephelus akaara until the period they are not eaten by large fish, compact, having excellent installation workability, and supplying safe prey field to the fries, promoting growth of the fry to improve survival rate of discharged fry and increase the fishing, and using thinning to help operation and maintenance and revival of a forest.SOLUTION: The reef for protection and caring of fries includes: an outer building frame framed like a hexahedron by structural material such as steel; an inner building frame formed inside (in the central part) of the outer building frame like a square by structural material and connected to the outer building frame by a horizontal lumber; a caring partition disposed inside the inner building frame and having a fish nest part and/or feed proliferation part; a feed culture material disposed in a protection partition between the inside of the outer building frame and the inner building frame; and a protector which is stretched or fixed to the respective six planes of the outer building frame or the inner building frame and formed by mesh opening net body or a lattice not allowing large fish to pass.

Description

  The present invention protects and cultivates released juveniles such as pheasant grouper, okoze, scorpion, etc., which are artificially grown fixed fish species, until they are not damaged by large fish, etc., and greatly increases the survival rate of released larvae It relates to fry protection reefs.

In the coastal waters, larvae such as pheasant groupers have been released, and usually the same type of adult fish that has already been inhabited and caught are often selected as the appropriate waters. However, even if these artificially grown juveniles are released into a marine area suitable for habitat, they are unfamiliar with the natural environment and may be damaged by adult fish such as pheasant grouper and scorpionfish that live in the area immediately after the release. It is considered that the survival rate is low and it has not led to an increase in catch. In addition, even if released larvae are grown and caught after 2 to 3 years, it is estimated that there is little movement of fry after release from the survey results indicating that they have not moved significantly from the released waters, which is suitable for breeding. Even if fry is released, it is thought that the effect of release will not be obtained unless conditions for protecting and growing can be ensured until large damage (predatory fish) is prevented and until it grows to some extent.
In order to solve this problem, as a fish reef for the purpose of fostering fry, (Patent Document 1) states that “a mounting base 2 for fixing the position, and a fish reef effect that is attached to this mounting base 2. A juvenile release reef comprising a fish nest base 3 and a release base 1 which can enter and exit fry, larvae or aquatic organisms. The mounting base 2 has a specific gravity within the structural frame 10. An artificial fish reef for releasing artificially hatched or nurtured fry or larvae that are randomly packed with large rock masses 11 or laminated with concrete blocks having a large specific gravity in a structural frame. Has been.
In addition, (Patent Document 2) states that “the upper surface is an open / close type having a net that cannot pass a large fish, the side is trapezoidal, and the lower part is open, the upper part is opened, and the fry is released. An “artificial fish reef” that protects the space inside the cylinder and gradually disperses the released fry is disclosed.
On the other hand, the use of thinned wood, a by-product of forest maintenance, to fish reefs helps to restore the forest and prevent disasters, and the process by which thinned wood attached to fish reefs decays and is converted into fish food forms a complete natural circulation. Although it is regarded as an effective means for CO ₂ countermeasures, it is currently not being used for fish reefs due to its relatively short period of effect and its buoyancy and complicated installation.
In the “Guide to using thinned wood for fish reefs” presented by the Fisheries Agency in March 2006, (1) Fish reefs using thinned wood have more prey compared to concrete and steel reefs. (2) A large amount of food such as shrimp will be generated in a short period after installation. (3) In addition to raising the availability of perforated organisms such as beetle beetles as fish food, the thinning material selection method, durability, buoyancy support, and attachment method are shown. Thinning material is actively used as a functional member of fish reefs. Is supposed to be done.

JP 2002-233265 A Japanese Patent Application Laid-Open No. 07-184509

Guidance on the use of thinned wood for fish reefs (March 2006: Fisheries Agency Fishery Port Fisheries Development Department)

However, the above conventional techniques have the following problems.
(1) In the technology disclosed in (Patent Document 1), a discharge tool and a discharge facility that provide a discrete countermeasure action at the time of discharge have been developed. At the time of discharge, a discharge base into which fry fish have entered is transported to the discharge sea area, in advance. In addition to the large work required to fit into the reef fitting part installed in the sea, large predatory fish cannot enter the inside of the narrow frame consisting of a water-permeable net filled with shells etc., but the release base There is a risk that large predatory fish may invade, inhabit, and prey on the released juvenile into the gap between the fish nest bases, the voids in the mounting base filled with rock masses, and the lower part of the fish reef when legs are provided. Had the problem of being.
(2) In the technology disclosed in (Patent Document 2), it controls the rapid dispersion of fry after release, requires the work of opening the top of the reef and releasing the fry into the inside, However, since it is one large space and does not have a feed breeding function, there is little stagnation of released fry inside the reef, and there is a problem that it is difficult to protect and grow for a long time.
(3) In the technique described in (Non-patent document 1), thinned wood gradually wears out, and the feed growth effect disappears in 3 to 5 years, and marine organisms such as attached seaweed peel off with wear. There was a problem that the long-term protection and nurturing effect could not be continued.

  The present invention solves the above-mentioned conventional problems, and can be protected and cultivated until the time when it is not subject to food damage from large fish in the marine release of fixed fry, such as artificially grown pheasant groupers, installation work In addition to providing excellent feeding quality, it provides a safe feeding ground for fry, promotes the growth of fry, improves the survival rate of released fry, increases catch, and promotes coastal fisheries, and leads to thinned lumber reefs. The purpose of this project is to provide a fry conservation and reef that will help increase the use of forests by using new methods and help maintain and restore forests.

In order to solve the above conventional problems, the fry protection and breeding reef of the present invention has the following configuration.
The fry protection and breeding reef according to claim 1 of the present invention has an outer shell framed in a hexahedron shape with a structural material such as a steel material, and a rectangular cylinder with the structural material inside (center portion) of the outer rod body. An inner casing formed and connected to the outer casing with a horizontal member; a breeding section having a fish nest and / or a feed breeding section disposed inside the inner casing; the inner side of the outer casing; A food culture material disposed in a protective compartment between the inner rods, and an open guard that cannot pass large predatory fish stretched or fixed on each of the six surfaces of the outer rod and / or the inner rod; and It has the composition provided with.
With this configuration, the following effects can be obtained.
(1) Since the outer skeleton or the inner skeleton is surrounded by a guard such as an open wire mesh that the predatory fish cannot pass through, the risk that the larvae released in the fry protection reef can be damaged by large predatory fish can be reduced. .
(2) Since the breeding section is equipped with a feed breeding section and the protective section is equipped with a feed culture material, it is not necessary for the fry to come out of the breeding reef and take food, preventing the early reef of the fry, Accordingly, the risk of being preyed can be reduced, and fouling establishment and survival rate can be increased.
(3) By providing a fish nest part in which the fry can hide from external enemies in the breeding section, it is possible to form a habitat and prevent outflow of fry by seawater flow during stormy weather. In addition, even during the winter period when the activity is low and it hardly moves, the damage caused by fry can be greatly reduced and the retention rate can be increased.
(4) Since the fry protection and reef is formed of a protective body with a large opening that does not impede the tidal current, fresh water can be secured and a good habitat environment can be secured.
(5) Fixed larvae such as pheasant groupers have a habit of deeply sinking into dark constrictions such as holes in the bottom of the rocks and shadows in the natural sea area. The fish nest part will perform the same effect as the shadow of the natural sea area, and the provision of a large number of fish nest parts on the fry protection and reef will prevent early diffusion and dissipation of larval pheasant fry, etc. Many fry can be established without suffering damage from indigenous fish.
(6) Although larvae such as pheasant flocks flock in closed spaces such as aquaculture ponds where many are raised, try to exclude other fish from their habitats in open spaces after release because they are not a habit of acting as a group It is rare that multiple tails coexist. A fish nest with a function that matches the habits of the anchoring fish species will encourage fostering of fry and protect it.
(7) Seawater flow due to tides is large in shallow waters where coastal larvae live. In addition to the effect of suppressing seawater disturbance caused by fry protection and breeding reefs, it is possible to improve the retention rate of fry by creating a quiet space with the fish nest.
(8) The presence of both the fish nest part and the feed breeding part in the breeding section will serve as a feeding ground and a hideout, preventing early dissipation of released fry and improving the establishment rate. Can be planned.
(9) Since the fry protection and reef has a hexahedron structure such as a rectangular parallelepiped, the combination of fry protection and reef is freely adopted according to the water depth, the presence or absence of sea tides, the seabed conditions such as sand, mud and gravel. be able to.
(10) Thinned wood installed in the sea generates a large amount of amphipods such as leaf shrimp, and beetles, bark beetles, etc. that bite into the thinned wood and cause damage are also feed for fish.
(11) Effective use of thinned wood, which is a byproduct of forest maintenance, helps maintain and restore the forest and can process thinned wood without emitting CO2.

Here, a cube, a rectangular parallelepiped, or the like is used as the shape of the outer casing or the inner casing. In addition, as the structural material, an L-shape or U-shape made of steel or concrete, a flat plate, a bar, a pipe, or the like is used.
The inner casing is connected to a horizontal member provided on at least two of the frames of the outer casing. In some cases, a natural stone having a large weight is disposed as a feed breeding material in the inner casing or on the upper part of the outer casing, and it is desirable that the horizontal member provided in the outer casing has strength considering the weight.
You may arrange | position a top plate in the upper surface of an internal housing, and one or more shelf boards in an inside. In any case, those having a strength capable of passing a fry such as a punching metal, an expanded metal, and a wire net and capable of supporting the weight of a feed breeding material or the like are suitably used. When using a heavy food breeding material such as natural stone, it is desirable to install a reinforcing material under the top plate or shelf. By disposing one or more shelves, it is possible to increase the number of fish nests and feed breeding parts, and to increase the rate of fixing fry.
A lower bottom plate such as a steel plate may be provided on the lower surface of the inner casing. When reinforcement is required, it is the same as the top board and the shelf board. By providing the lower bottom plate, it is possible to cover the sea floor and prevent the reef itself from sinking.
When placing natural stones, concrete lumps, shells, etc. as feed breeding materials on the top plate, it is desirable to take measures to prevent dropping and movement, such as by surrounding the top plate with a frame material or using gabion. . When a feed breeding material is placed, marine organisms adhere and grow close to the water surface, and seaweeds also grow. Therefore, it is possible to shield the inside of the reef and form an environment in which fry can easily live.
When large weights of natural stones are used for the breeding material in the breeding section, the weight of the fry protection breeding reef increases and prevents the reef from moving and falling, but the specific gravity of other food culture materials is small, When buoyancy and weight are not balanced, such as when a lot of thinned wood is used, a concrete base or a fixed concrete block may be provided below the bottom structural material.

The protective body stretched on the outer casing or the inner casing is not particularly limited, but a steel wire mesh, a resin frame, a grid made of steel or synthetic resin, punching metal, expanded metal, etc. may be used. Among them, punching metal, expanded metal, and steel wire mesh can be preferably used from the viewpoint of durability, strength, and weight.
Moreover, the opening of a protector should just be a magnitude | size which predatory fish cannot pass according to the kind of predatory fish which prey on fry, and is not specifically limited.
In some cases, the protective body is installed on both the external housing and the internal housing, or when only the external housing is installed, only the internal housing is installed.
When installed on both the external and internal enclosures, the openings on the outer periphery of the outer enclosure shall be such that large predatory fish cannot pass through. In order to protect against damage from fish, it is desirable to narrow it to the extent that the released fry can pass.
When installing only on the external housing, it is desirable that the opening of the protective body is slightly smaller than when installing on both the external housing and the internal housing. This is to protect against damage from pre-released juveniles before the previous year. In this case, the protection zone and the growth zone become a protection growth zone in which the two are integrated.
In the case of installing only in the internal skeleton, it is desirable to narrow the opening of the protective body to the extent that the released fry can pass for the same reason as in the case of equipping both the external skeleton and the internal skeleton.
In addition, since the fry protection and reef is installed in a relatively shallow sea area, the nets of the protectors in the upper and middle parts are covered with marine organisms such as seaweed, which is useful for forming a dark part suitable for staying of fry. In the lower part, the so-called sand drift phenomenon, in which sand flows by seawater, has little biological attachment, and it is possible to secure sufficient access to the released fry. If the clogging is significant at the time of discharge, it may be necessary to remove a part by a diver, but it is a shallow sea area, the removal work is easy, and the maintenance workability is excellent.

In the case where a dissipative prevention body formed of a mesh body having an opening that prevents fry from passing through is provided on the lower side and the bottom of the outer periphery of the external housing, the following effects are obtained by the configuration.
(1) By providing an anti-dissipation body, it is possible to prevent the fry that have entered the reef after release from spreading and dissipating out of the reef at an early stage, and to improve the retention rate of the fry.

  The dissipation prevention body is preferably made of the same material as the protection body, and is stretched or fixed to the lower side and the bottom of the outer periphery of the outer casing. Since some of the fry that have entered the reef immediately after release tend to diffuse out of the reef from the bottom, the dispersal prevention body prevents early diffusion of fry immediately after discharge into the reef. can do.

The feed breeding section of the breeding section may be formed by holding the feed breeding material with the side protector and shelf material of the inner housing, but it is made of steel or synthetic resin housings, nets, and box-like lattice bodies. It is desirable to form with a water flow case. This is to prevent deformation and damage of the side protector when using a natural stone with a large weight as a feed breeding material, and when using a food breeding material with a small weight, This is to prevent movement and damage.
Moreover, you may put food breeding materials, such as a natural stone with a long diameter of 10-15 cm, a concrete piece, a stone piece, a brick piece, as a feed breeding material arrange | positioned and accommodated in a feed breeding part. Thereby, when a feed breeding material turns into a heavy stone and a fry is released on a fry protection protection reef, it is easy to be accommodated in a reef through gaps, such as a natural stone. Moreover, as a feed breeding material, a glass foam material, a shell piece, steel slag, etc. can be used besides this. Natural stone among the feed breeding materials can increase the dead weight of the fry protection and reef, and should be used suitably without being polluted by the surrounding environment even if it is said that it will decay in the future or will be scattered in the surrounding sea area. Can do.

As the fish nest portion, a tube made of ceramic or cement, a container such as a flower pot, a clay tube, a synthetic resin, or steel is used. This is because the durability that can maintain the function for a long time in the sea must be maintained.
In addition, the size of the fixed larvae in the first few months of life is about several centimeters in length, 6-8 centimeters for pheasant groupers, and about 2 centimeters in height. As long as it can stay even during periods of decline in activity and growth stagnation, in addition to the above, the shape of tubes, rectangles, truncated pyramids, truncated cones, etc. desirable.
It is desirable that one or more fish nests are arranged and arranged on the shelf or lower bottom plate of the inner casing in the breeding section after taking measures to prevent the movement of the feed breeding material.
The fish nest part and the feed breeding part are installed on one or more shelves, so that the fry can move vertically between the shelves between the feed cases of the feed breeder, It is desirable to provide the hollow tube by placing it vertically.
The fish nest part can be randomly arranged on the feed breeding part if it has a weight and shape that does not move due to seawater flow, but if it has a weight and shape that can move due to seawater flow, it should be covered with a mesh or lattice case. Desirably, the mesh also needs an opening that allows fry to pass through.
The fish nest part and the feed breeding part do not interfere with each other, but when using heavy natural stones, there is a risk that the fish nest part will be severely damaged at the bottom. Therefore, it is desirable to use a feed breeding material with a small specific gravity when the fish nest is on the bottom.

As the feed culture material, thinned wood, metal or concrete pipes, metal or concrete L-shape, U-shape, flat plate, square, brick, unglazed pieces, etc. are used.
As for the thinned wood, those having a size of 3 to 15 cm and a length of 50 to 195 cm which are not suitable for sawing are preferably used, but those having a small diameter and not suitable for sawing can be used. . The length needs to be equal to the width of the protection section. However, in the case where the length is aligned with the pipe material or the like, it is not necessary to have the diameter and the length of the end of the pipe because it is along the pipe material. As for the type of thinned wood, cedar and cypress are common, but the type is not limited.
Thinned wood gradually decays after infiltration into the sea. In this process, it becomes a suitable food for crustaceans and the like, and promotes its growth, and also includes beetles, bark beetles and the like that are perforated by damage inside the thinned wood. The thinned wood placed in the protected area will produce prey for 3 to 5 years until it is fully utilized by these marine organisms.
Moreover, it is desirable that the thinned material is covered with a mesh-like holding body made of a metal or synthetic resin net in the length direction. This is because the net-like retaining material can maintain its shape along with the attached organisms even after the thinned wood has disappeared, and the breeding effect of the feed organisms and the space for the fry can remain.
The pipe has a diameter of about 15 cm, and the material is not particularly limited, but a steel pipe, a synthetic resin pipe such as a polyvinyl chloride pipe, a clay pipe, or the like can be used. In view of strength, durability, workability, and environmental load, steel pipe materials are preferably used. Steel pipe material has a large specific gravity, can improve the stability of the reef, can reduce its buoyancy when tying it with thinned wood, and also has a large feed biological growth effect due to adhesion of adherent organisms, peeling of rust surface, surface renewal, etc. I can expect. Moreover, it is desirable to match the length of the pipe material with the width of the protection section.
The concrete material having the same shape as the pipe material is used. This is because the concrete material has a large specific gravity, so that the same action and effect as the steel pipe material can be expected.
Thinned wood and pipes may be disposed on the upper surface of the external housing. When placing buoyant materials such as thinned wood, it is desirable to strongly fix them to the external frame so as not to leave. However, when fixing thinned wood, etc. to the outside, the openings of both ends of the thinned wood and pipes should be covered with an open mesh that prevents large predatory fish from passing through to prevent the large predatory fish from clinging. desirable.

  When food culture materials such as thinned wood and pipes are arranged in the protected compartment, it is desirable to combine the thinned wood, pipes, etc. in a multi-stage multi-row such as a cross-girder shape that forms many voids. Thereby, while being able to ensure the swimming space of a fry, the passage of fresh seawater can be secured, and intense seawater flow at the time of stormy weather etc. can be reduced. In addition, for 3 to 5 years after installation in the sea area, thinning materials and feed breeding materials made of steel pipes supply prey organisms, and even after the thinning materials disappear, the supply can be continued with mesh-like holding materials and pipe materials, and further internal thinning The net-like holding material after the disappearance of the material can be a suitable fish nest space inside.

  The sea area where the fry protection and reef is set up is the area where the same species of fish that are being released is already inhabited, and the inland sea and the bay where the sea is quiet are preferably selected, and the bottom of the sea is likely to be stable and buried. A stable sea area with a lot of pebbles such as no stone is desirable. However, if it is not in such a sea area, it is possible to prevent the fry protection reef from moving and burying by providing a lower base plate on the inner frame or fixing a concrete base etc. to the foot of the outer frame. Function can be demonstrated.

The invention described in claim 2 is the fry protection and reef according to claim 1, wherein one or more apertures are formed in the breeding section of the inner enclosure so that fry fish and the like can freely enter and exit. A fish nest formed in a tubular body, a rectangular parallelepiped, a truncated pyramid shape, a truncated cone shape, etc., and a natural stone, a shell piece, a concrete piece, a steel slag provided above or below the fish nest part And a food breeding part such as a glass foam material.
With this configuration, the following actions are obtained in addition to the actions obtained in the first aspect.
(1) Since the feed breeding part provided with the feed breeding material is arranged at the upper part or the lower part of the fish nest part, it is possible to supply the bait organisms necessary for the fry and to fix the fry in the internal enclosure.
(2) As a material for breeding food, the use of materials that have as little environmental impact as possible and that exist in nature is used to promote the adhesion and growth of marine organisms such as seaweed and sea squirts on the surface and gaps of the material used. Then, along with the growth of these marine organisms, polychaetes such as sandworms, crustaceans such as shrimps and crabs, amphipods such as leaf shrimps and other various marine organisms will grow and grow, and the food culture function is high. In addition, the use of natural stones with a large specific gravity can stabilize the fry protection and reef reef.
(3) Since there is an opening in the fish nest, fry can freely enter and exit the fish nest.
(4) At least one hole is formed in the fish nest to ensure the entry and exit of the fry and the circulation of the seawater, but the shelter function that prevents the fry from flowing out is high because the seawater flow is strong during stormy weather. Can do.

The opening portion formed in the fish nest portion may have any shape such as a substantially circular shape or a polygonal shape, and may form a slit. However, although there are no particular limitations on the hole diameter, the hole diameter of the hole, the width of the slit, etc., a size of about 30 to 50 mm is preferably selected from the body length of the fry. This is to prevent fry from entering and leaving the fish nest even when large predatory fish enter the fry protection and reef.
Further, the number of openings, holes, and slits is not particularly limited, but it is necessary that the degree of shielding in the fish nest can be maintained by the tide in the sea area where the fry protection and reef is installed.
The inside of the fish nest may be a size that allows at least one fish to live.

The fish nest part and the feed breeding part may be combined and integrated as a growing case. In this case, the growing cases integrated on the shelf of the inner casing may be arranged randomly, or a plurality of growing cases may be connected and arranged. It is desirable to divide the inside of the breeding case with a partition provided with a plurality of apertures in order to suppress movement of the feed breeding material. Moreover, the breeding case which combined the feed breeding part and the fish nest part may have a feed biological breeding part above or below depending on the property, weight, etc. of the feed breeding material. As a breeding case, one fish nest part combined with one feed breeding part or a number of fish nest parts combined with one feed breeding part may be used.
When arranging a breeding case in the breeding section, the following effects are obtained by the configuration.
(1) By accommodating and fixing a breeding case composed of a feed breeding part and a fish nest part in a breeding section with a few layers spaced apart, the inside of the fry protection protection reef can be kept dark and the fry can be easily retained.
(2) When a plurality of layers are installed, by having an interval at which fry can move up and down, water flow is good, fresh running water can be secured, and a good breeding environment can be secured.

Invention of Claim 3 is the fry protection protection reef of Claim 1 or 2, Comprising: The thinning material with which the said feed culture material arrange | positioned by the said protection division was covered with the mesh-shaped holding | maintenance material, and It is a pipe material, and has a configuration in which the food culture material is arranged and fixed in multiple stages and multiple rows in the protection section.
With this configuration, the following actions are obtained in addition to the actions obtained in the first or second aspect.
(1) Although thinned wood has buoyancy when it is installed in the sea, it gradually sucks in seawater and loses buoyancy in about one year. Furthermore, it is damaged by marine organisms and gradually wears and disappears. In addition, marine organisms adhere to the thinned wood and the mesh-like holding material that covers it, and the amount of attachment increases with the age. That is, for a few years after installation, the changes in buoyancy and weight balance of the fry protection and reef are quite large. Therefore, pipes and thinned wood are fixed together, arranged in multiple stages or multiple rows (incorporated in a cross-girder shape, etc.), and pipes with a large specific gravity and a strong structure are used as support materials, thus changing these buoyancy and weight balance. Can cope and maintain the shape.
(2) Even after the thinned wood is worn out in 3 to 5 years, the thinned wood is fixed together with the pipe material, and the net-like retaining material covering the thinned wood maintains its shape along with the attached organisms. And the space formed by the tube material can sustain the feed biological growth effect. In addition, the net-like holding material can create a constant space for released fry after the thinning material disappears.
(3) A variety of marine organisms such as barnacles and seaweeds adhere to the mesh-like retaining material that covers the thinned wood as well as the effects of prey growth in the course of the collapse of the thinned wood, resulting in a feed biological growth effect. If it is only thinned wood, it will fall off the attachment part and scatter downwards in the process of collapse, but it can be sustained until it is exhausted by surrounding it with a mesh-like holding material.
(4) Since the pipe material functions as a support material for the thinned material, and because the marine organisms adhere to the inside and the outside, the feed organism can be propagated. In addition, when a protective body is provided only on the inner skeleton and pipes are installed outside the reef top, etc., the inside of the pipe material can be made a retreat and concealment space for the discharge fry by closing both ends of the pipe material .

  As the mesh-shaped holding material that surrounds the thinned material, a material made of metal, synthetic resin, knitted with a composite material of synthetic resin, metal, and synthetic fiber or by extrusion molding is used. The opening is preferably 20 to 60 mm considering that the holding material is covered with a marine organism and closed after the disappearance of the wood. As the thickness becomes smaller than 20 mm, the netting is blocked by marine organisms attached to the holding material after the thinning material disappears, and it is difficult for fry to enter and exit, which is not preferable. As it becomes larger than 60 mm, large predatory fish easily come in and out, which is not preferable because the risk of fry catching food damage increases after the thinning material disappears. The thinned wood immediately after the seawater settling has a specific gravity of around 0.6 and has buoyancy, but gradually absorbs water and loses buoyancy and approaches the specific gravity of seawater in 1 to 2 years. For this reason, it is desirable that the mesh-like holding material has a strength that can withstand buoyancy even when tying it with a pipe material.

As described above, according to the fry protection and breeding reef of the present invention, the following advantageous effects can be obtained.
According to claim 1,
(1) When releasing fixed fry, it is easy for the fry after discharge to infiltrate immediately, prevent premature diffusion and dissipation, and large predatory fish cannot enter the interior, leading to the risk of predation and damage from large predatory fish It is possible to provide a fry conservation and reef that can increase the stability and survival rate of released fry.
(2) Since it is a hexahedron structure such as a rectangular parallelepiped, it provides fry fish protection and reef that can adopt combination coupling according to the depth of the water, the influence of sea tide, the seabed condition of sand, mud, gravel, etc. be able to.

According to invention of Claim 2, in addition to the effect of Claim 1,
(1) A large number of fish nests that serve as a narrow dark place suitable for colonized fish species, and a high feed-growing function that provides a high retention effect that matches the habits of settled fry. Can be provided.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2,
(1) The use of thinned timber for reefs has a high effect on the growth of feed, but there were difficulties in sustaining the effect. Sustainable effects can be ensured, and fry protection reefs that can be released continuously for a long period of time can be provided.

The perspective structure figure of the fry protection protection reef of Embodiment 1 Whole perspective view of fry protection and breeding reef of Embodiment 1 Top view of fry protection and reef of embodiment 1 Bottom view of fry protection and reef of embodiment 1 3 is a cross-sectional view taken along line AA in FIG. (A) BB sectional drawing of FIG. 3 (b) The perspective view which shows an example of the fish nest part of the fry protection and breeding reef of Embodiment 1 CC sectional view taken on line CC in FIG. (A) Whole perspective view of the fry protection and reef of Embodiment 2 (b) Cross-sectional view of the main part of the fry protection and reef of Embodiment 2 The partially broken perspective view of the fish nest part of the fry protection and breeding reef of Embodiment 2 Submarine layout of fry protection and reef in Example 2 Transition chart of the retention rate of pheasant fry

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
The present invention is not limited to this embodiment.
(Embodiment 1)
FIG. 1 is a perspective view showing the framework of a fry protection and breeding reef according to Embodiment 1, FIG. 2 is an overall perspective view of the fry protection and breeding reef according to Embodiment 1, and FIG. 3 is a plan view thereof. 4 is a bottom view thereof.
1 is a fry protection and reef of the first embodiment, and 2 is an outer skeleton of the fry protection and reef 1 formed of hexagonal steel having a height of 70 to 300 cm, a width of 100 to 500 cm, and a width of 100 to 500 cm. Reference numerals 2 a denote external vertical struts formed at the four corners of the external housing 2. In addition to the square external vertical struts 2a, the external casing 2 may be provided with beams made of steel such as angle steel for reinforcement and fixation regardless of the vertical and horizontal directions. Reference numeral 3 denotes a rectangular cylindrical inner casing disposed and fixed in the center of the outer casing 2, 3 a an upper frame member of the inner casing 3, a lower frame member of the inner casing 3, and 3 c connecting the inner casing 3 to the outer casing 2. In addition, a horizontal member 3d that forms part of the upper frame member 3a and the lower frame member 3b, 3d is an internal vertical column of the internal frame 3 whose upper and lower ends are connected to the horizontal frame 3c, and 3e is an upper surface of the internal frame 3. An upper top plate made of a fixed iron plate, punching metal, expanded metal, wire mesh, etc., 3g is a frame member fixed to the upper frame member 3a and surrounds the upper top plate 3e, 3h is an upper frame member 3a and a lower frame member One or more intermediate parts composed of punching metal, expanded metal, nets, lattices, etc. fixed to an intermediate frame material 3k formed and fixed so as to be horizontal to the internal vertical column 3d between 3b Shelf plate, 3i is an iron plate or pan fixed to the lower surface of the lower frame member 3b A lower bottom plate made of a protective body such as metal, expanded metal, a wire mesh or a lattice body, 3j is a light shielding portion formed by an upper top plate 3e and a frame member 3g, and 5 is formed between the outer housing 2 and the inner housing 3. It is a protected area.

2 to 4, reference numeral 6 denotes a natural stone placed on the light-shielding portion 3 j, 7 denotes an upper protective body made of a protective body disposed and fixed on the upper surface of the external housing 2 or the protective compartment 5, and 8 denotes an external housing 2. A side protector comprising a protector fixed to the upper side of the side, 9 is a protector having a smaller opening than the side protector 8, and a side dissipative preventer disposed below the side protector 8. Reference numeral 10 (see FIG. 4) denotes a lower dissipation prevention body which is formed of a protective body having the same opening as the side dissipation prevention body 9 and which is disposed on the inner lower surface of the outer casing 2.
On the outer periphery of the external housing 2, the upper protective body 7 and the side protective body 8, which are formed of a protective body having an opening of about 25 to 50 mm, and fry are prevented so that large predatory fish cannot enter the inside. For this purpose, the side dissipative prevention body 9 and the lower dissipation prevention body 10 formed of a protective body having an opening of about 10 to 30 mm are fixed to the book. A large number of natural stones 6 having a major axis of about 10 to 15 cm are stacked on the light-shielding portion 3j on the upper part of the inner casing 3. Although the natural stone 6 is piled up in the light-shielding part 3j, in addition to the natural stone 6, a thing with its own weight such as a concrete piece or a piece of stone can be placed. Thereby, since the lower side of the light-shielding part 3j is light-shielded, it becomes an environment where it is easy for a fry of fixing nature to live. Further, in a place where the tide is fast, the natural stone 6 may be covered with a wire mesh or the like and fixed to the light shielding portion 3j so that the natural stone 6 is not shed by the tide.

5 is a cross-sectional view taken along line AA in FIG. 3, FIG. 6 (a) is a cross-sectional view taken along line BB in FIG. 3, and FIG. 6 (b) is a fry protection and breeding reef of the first embodiment. It is a perspective view which shows an example of the fish nest part, and FIG. 7 is CC sectional view taken on the line of FIG. 6 (a).
In FIG. 5, reference numeral 11 denotes an inner side surface protection body that is formed of a wire mesh or the like smaller than that of the side protection body 8 and is fixed to the internal housing 3, and 12 denotes an inner side surface protection body 11 and an upper top plate 3 e. The growing section surrounded by the lower bottom plate 3i, 13 is a steel pipe member assembled on the cross girder in the protective section 5, 14 is an opening formed in the side surface of the steel pipe member 13, and 15 is both ends of the end portion of the steel pipe member 13. It is an opening.
In FIG. 6, reference numeral 16 denotes a food such as seaweed or shrimp formed by filling each shelf 3i of the breeding section 12 with a food breeding material such as natural stone, glass foam or shell, about 1/4 to 2/3 of the volume. Feed breeding portions 17 and 17a for establishing and propagating organisms are formed in the nest portions of the fish nest portions 17 and 17a. An opening portion 19 having a size through which the fry can be passed, 19 is a hole portion formed on both ends of the fish nest portion 17.
In the protective section 5, a plurality of rows of steel pipe members 13 having openings 14 and having openings 15 at both ends are stacked and assembled in a plurality of stages on the well beam. The inner casing 3 is covered with an inner side surface protection body 11 made of a wire mesh having an opening of about 30 mm. The inner housing 3 is divided into upper and lower two stages by an intermediate shelf 3h fixed to the intermediate frame member 3k, and each stage is layered with a feed breeding material 16 'such as natural stone 6 and the like, A large number of fish nests 17 and 17a are provided on the upper surface. A space in which fry can swim is formed between the fish nests 17, 17a, the upper top plate 3e, and the intermediate shelf 3h.

The fish nests 17 and 17a are made of a potted pot made of earthenware or cement, a clay pipe, a synthetic resin or a steel material. As the shape of the fish nest portions 17 and 17a, various shapes such as a straight tube shape, a T-shaped tube shape, a rectangular parallelepiped shape, a truncated pyramid shape, and a truncated cone shape are selected. Moreover, the hole part 18 and the hole part 19 with a diameter of about 30-50 mm are formed in the fish nest parts 17 and 17a. The number of apertures 18 may be increased or decreased as appropriate in consideration of water permeability.
The inner casing 3 is provided with at least one intermediate shelf 3h. Since the breeding section 12 is divided into several chambers by the intermediate shelf 3h, the ratio of the feed breeding section 16 and the fish nest section 17 occupying the inside of the inner housing 3 can be increased, the breeding rate of the feed organism can be increased, and the fry Can be increased.
When the inner casing 3 is not provided with the inner side surface protection body 11, in order to prevent the food breeding material 16 'filled in the food breeding section 16 from falling, the intermediate shelf 3h is framed in the same manner as the upper top board 3e. It is desirable to provide 3 g. When the intermediate shelf 3h is made of expanded metal, it is shaped like a bowl, and a reinforcing material is disposed at the bottom, or the feed breeding material 16 'is placed in a water-resistant case, and the case is attached to the internal vertical column 3d. It may be fixed.

In addition to the steel pipe material 13, a synthetic resin pipe material such as vinyl chloride, a thinning material, or the like can also be used for the protective compartment 5. In addition, when using the pipe material and thinning material made from a synthetic resin, it is preferable to use the thinning material in parallel with the steel pipe material 13 and fixed to the steel pipe material 13 in consideration of the buoyancy. Furthermore, the thinned material is used by winding a rigid net made of metal or synthetic resin having shape retaining properties. As a result, when the thinned timber is corroded, the net body maintains its shape along with the attached organisms, so the space formed by the thinned timber and the tube can maintain the feed biological growth effect, and the larvae of the released fry A space can be created.
Both end openings 15 are preferably covered with a mesh or the like having a mesh size that prevents predatory fish from entering. Moreover, in the open hole 14, it forms in the hole diameter which a predatory fish cannot penetrate | invade. Thereby, even when a predatory fish enters the fry protection and breeding reef 1, the steel pipe material 13 can be used as a retreat space, and the risk of food damage can be reduced.
The upper protection body 7 and the side protection body 8 are not provided, and the protection section 5 may be an open space. Even when the protection section 5 is an open space, it is preferable to provide the side-dissipation prevention body 9 and the bottom-part dissipation prevention body 10 at the lower side and bottom of the side surface of the external housing. In this case, you may equip the lower part of the internal side surface protection body 11 with a side part dissipation prevention body. Moreover, it is desirable to cover the openings 15 at both ends with a mesh body having a mesh size that prevents the predatory fish from entering, so that the large predatory fish does not catch inside the steel pipe 13. In addition, by fixing to the external vertical strut 2a, the internal vertical strut 3d, etc., the steel pipe material 13 does not move, and stability can be increased.

  The juvenile protection breeding reef 1 is composed of an outer enclosure 2, an upper protection body 7, a side protection body 8, a side dissipation prevention body 9, an inner side surface protection body 11, barnacles, seaweeds, and other marine organisms as time passes after installation. It is feared that the nets of each protector (7, 8, 9, 11) will be blocked by the marine organisms that are attached and grown. In general, in the sea area where sand drift phenomenon occurs, it is several tens of centimeters from the sea floor. At high altitudes, drifting sand inhibits the attachment of marine organisms, so clogging is unlikely to occur and fry cannot pass through and do not give stress.

The fry breeding method using the fry protection and breeding reef 1 of the first embodiment configured as described above will be described.
First, the juvenile protection breeding reef 1 is installed in the discharge area several months before the fry release. Thereby, the outer shell 2, the inner shell 3, the natural stone 6, the upper guard 7, the side guard 8, the side dissipation prevention body 9, the inner side guard 11, the steel pipe material 13, the feed of the fry protection and reef 1 Since food organisms adhere to and inhabit the growth section 16 and the like, the food organisms are sufficiently proliferating at the time of release.
Next, when the fixed fry is released in this state, the fry goes into the fry protection and reef 1 which is an affordable retreat.
At this time, a part of the fry gathers at the bottom of the fry protection breeding reef 1 and gradually diffuses, but since the fry can not pass through the side-side dissipation prevention body 9 and the bottom-dissipation prevention body 10 are provided. Dissipation of fry in the early stage can be prevented.

  Next, the fry feeds each fish nest portion 17 in the breeding section 12 as a place of residence while feeding on prey-grown feed organisms. Since the prey is sufficiently inhabited within the fry protection and reef 1, it is not necessary for the fry to go out of the fry protection and reef 1, and the upper protection body 7, the side protection body 8, and the side dissipation prevention Since the body 9 and the bottom-dissipation prevention body 10 are provided, the large predatory fish cannot enter the fry protection and reef 1. Thereby, it can be safely raised while protecting the fry without being exposed to the risk of food damage.

  Next, as the fry grows, it gradually becomes difficult to pass through each protector. Therefore, when the large predatory fish grows to a size that does not prey, it is difficult to live in the fry protection and reef 1 and the fry itself diffuses outside. Thereby, at the time of the next discharge of the fry, the fry which grew in the fry protection and breeding reef 1 does not remain, and can be used as it is.

As described above, since the fry protection and breeding reef in the first embodiment is configured, the following effects can be obtained.
(1) Since many natural stones are stacked on the upper surface and rearing area of the fry protection and breeding reef, the fry immediately after release is easy to hide in the gaps between the natural stones, and the weight of the fry protection and reef is also increased. Stable without moving or falling. Moreover, since sunlight can be shielded, it is easy for fixed fry that prefers a narrow dark place to stay for a long time.
(2) Since the fry protection and breeding reef is made of steel, the biological attachment part is peeled off and renewed due to rusting as time passes, so that new feed organisms can be attached.
(3) Since the protected compartment or the inner skeleton is surrounded by an open guard that cannot pass large predatory fish, the released fry can be established without hitting the large predatory fish.
(4) Since the lower part of the fry protection and reef is surrounded by a spread prevention body and a steel plate that cannot pass fry, it is possible to prevent early fry reefs and improve the retention rate.
(5) Since the feed organism can be cultured, it can act as a feed station and prevent the fry from spreading.
(6) Since the breeding section has a multi-stage fish nest and feed breeding section, the growth rate of feed organisms can be increased, the concealment space for fry can be increased, and the number of fry accommodated in the fish nest is increased. Can be more.
(7) Since it has a fish nest part, it is possible for fixed fry such as pheasant groupers with strong territory consciousness to have settlement and concealment space in the fish nest part, and to protect and cultivate without competing with each other.
(8) Since there are multiple openings and holes in the fish nest, the fry can enter and exit freely, so the released larvae hardly feel stress and the seawater circulates, so oxygen and plankton are sufficient. Can be supplied to.
(9) Since steel pipes and cast iron pipes are used, the weight of the fry protection and reef is increased, it is excellent in stability, and the openings and openings at both ends are covered with a net so that large predatory fish cannot enter. Steel pipes can be used as fry dwelling and concealment spaces.
(10) Since the steel pipe material is assembled on the cross girder, a swimming space can be secured and the fry is less likely to feel stress.
(11) Since there is a steel plate at the bottom center of the fry protection and reef, it is possible to prevent subsidence in the case of sandy sea bottom, and in combination with the bottom-dissipation prevention body, it is possible to prevent the invasion of predatory fish from under the bottom. .

(Embodiment 2)
The fry protection and breeding reef of Embodiment 2 will be described below with reference to the drawings.
In addition, the same code | symbol is attached | subjected to the thing similar to Embodiment 1, and description is abbreviate | omitted.
8A is an overall perspective view of the fry protection and breeding reef of the second embodiment, FIG. 8B is a cross-sectional view of the main part thereof, and FIG. 9 is a fish nest of the fry protection and breeding reef of the second embodiment. FIG.
In FIG. 8, 3j is a shading part, 6 is a natural stone placed on the shading part 3j, 9 is a side-scattering prevention body, 20 is a fry protection and reef of Embodiment 2, and 21 is a lower part of the fry protection and reef 20 A concrete base fixed to the base, 23 is a thinning material disposed in the upper part of the fry protection and reef 20 and the feed bioculture section 5, and 24 is a mesh made of a protective body such as a wire mesh wrapped around the thinning material 23 and covering the side surface. 25, a bundle that bundles a plurality of thinned materials 23, 26 is a side protector made of a net or lattice fixed to the upper side of the outer casing 2, and 27 is a food breeding portion 16a and a fish nest portion 17b. This is a combination case.
Other parts not shown are the same as those in the first embodiment, and are therefore denoted by the same reference numerals and will not be described.

In FIG. 9, the feed breeding portion 16a of the breeding case 27 has an opening 16a-1 having the same size as the opening surface of the fish nest portion 17b, and is fixed in contact with the opening surface of the fish nest portion 17b. The peripheral wall and the bottom are formed in a mesh body or a lattice body so that food organisms can easily survive and grow. The natural stone 6, the glass foam material 28, the shell piece 29, etc. are accommodated in the inside. As described above, the fish nest portion 17b is formed in a pot shape made of synthetic resin, earthenware, or cement, and an opening 18 is formed in the bottom or wall surface. Reference numeral 30 denotes a fixture for combining the feed breeding portion 16a and the fish nest portion 17b.
In addition, the fish nest part 17b may be formed as a cell box by connecting a large number of openings on each upper surface as a cell. Moreover, you may form the feed multiplication part 16a in the water flow case with which the surrounding wall and bottom wall were provided with the net | network body or the grid | lattice body provided with the opening surface and contact opening surface of the above-mentioned cell box. By simply filling the feed growing case 16a with natural stones to the upper surface, covering the cell box on the opening surface, and fixing it with a fixing means such as a number wire, a growing case for cells can be created, and the workability is excellent.

Arranged on the upper part of the fry protection and reef 20 is a thinned material 23 alternately fixed in parallel with the steel pipe material 13 by a bundle 25. In the protection section 5, two thinning members 23 and one steel pipe member 13, which are fixed together in parallel by a bundle 25, are stacked in a cross-beam shape and fixed to a horizontal member. All of the thinning material 23 is wound in the longitudinal direction by a mesh-like holding material 24 made of polyethylene, polypropylene, vinyl acetate, nylon, steel or the like. As the side surface protection body 26 fixed to the side surface of the external housing 2, the same one as the side surface protection body 8 of the first embodiment is used.
The inner casing 3 is divided into multiple stages, and a breeding case 27 combining a fish nest part 17b and a feed breeding part 16a in which a feed breeding material is covered with a water-permeable case or the like is divided into three stages by an intermediate shelf 3h. It arrange | positions at each step | level in the inner casing 11 made. The fish nest part 17b has an opening part 18 having a size that allows a fry-fixing fry to enter and exit the outer peripheral part. Since the thinned wood 23 has a large buoyancy until it absorbs moisture, the concrete base 21 fixed to the lower part of the fry protection and reef 20 increases its own weight and provides stability.
In addition to the natural stone, a glass foam material, a shell, or the like may be placed on the light shielding portion 3j as in the first embodiment.

As described above, since the fry protection and reef reef in the second embodiment is configured, the following effects can be obtained.
(1) Since the concrete substrate is provided, even if a buoyant material is provided inside, it is stabilized without being moved or toppled by the tide.
(2) Since both the thinned material and the steel pipe material are combined in a cross-girder shape, the steel pipe material can maintain the shape of the cross-girder even after the thinned material corrodes and disappears.
(3) Since thinned wood is used, it helps to maintain and restore the forest and the thinned wood itself has a high growth effect of prey organisms, so it has a high food culture function.
(4) Food breeding materials such as natural stone, glass foam, and shells can be propagated on the surface and gaps of seaweeds and marine organisms in a short period of time after being installed in the sea, and can grow food organisms such as crustaceans. .
(5) Even after the thinning material disappears, the rigid mesh-shaped retaining material that covers the outer periphery retains its shape and retains seaweed and barnacles that serve as food on the surface, etc. By maintaining the above, a constant space for aquatic organisms can be created.

Hereinafter, the present invention will be specifically described by way of examples. The present invention is not limited to these examples.
Example 1
A rectangular frame made of angle steel and having a width of 1 m, a depth of 1 m, and a height of 1 m was prepared. The protection body (7, 8) on the upper part of the casing and each side part was formed using a wire mesh having an opening of about 50 mm. The intermediate shelf 3h has five levels, and the expanded metal (XG21) is disposed and fixed. A frame member 3g having a height of 100 mm was fixed around the upper surface of the upper top plate 3e of the inner casing 3, and a light-shielding portion 3j in which natural stones 6 covered with a metal mesh were stacked was formed. The lower bottom plate 3i was formed of an iron plate. The bottom part dissipation prevention body 10 was formed with the above-mentioned expanded metal. The growth compartment in the enclosure is made of vinyl chloride and has a truncated cone-shaped fish nest of about 6 x 13 cm, and the food breeding section is made of polyvinyl chloride, with a top opening and a bottom and peripheral wall grid. A water-flowing case formed in the shape of a glass, filled with glass foam, oyster shells, and shell pieces and covered with a wire mesh, and 60 growth cases in each stage, 300 in total. It was installed and used as a fry protection reef. This juvenile fish breeding reef was installed on the bottom of the coastal sea area.

As a result of observing the situation in the reef and the occurrence of marine organisms after 9 months, the food breeding materials and steel materials have a lot of seagrass and marine organisms, such as sea squirts, coral algae, sea anemones, seaweeds, mills, etc. Was also good.
In addition, juvenile fish such as sharks, squirrels, and gimpos about 5 cm long lived in the fish nest, and a large number of crustaceans, shellfish such as shrimp and shrimp were found inside the food breeding area. From this, it was confirmed that the fry conservation and reef has an effect as a seaweed bed.

(Example 2)
FIG. 10 is a seafloor layout diagram of fry protection and reefs for effect confirmation.
As shown in FIG. 10, four juvenile fish protection and reefs of Example 1 were installed in the test sea area of the Yamaguchi Prefectural Fisheries Research Center with a water depth of about 5 m. Twelve months after the installation, 836 pheasant larvae (about 6.5 cm long) were released from the surface above the fry protection and reef, and the retention rate and internal conditions were observed.

(Residence rate)
FIG. 11 shows the retention rate of fry from immediately after release to about one month later.
It was confirmed with an underwater video camera that 100% sneaks into the fry protection and reef immediately after release. Three hours later, about 68% of pheasant fry stayed, and after about 6 days, it was confirmed that about 25% remained. Thereafter, an average residence rate of about 25% was maintained until 23 days later. Since the retention rate of fry on general fish reefs is less than 10%, it was confirmed that the fry protection and reefs of this example are excellent in fouling of fry. It was also confirmed that the anti-dissipation body prevents early dissipation and enhances the fixability.

(Observation of internal conditions)
Immediately after release, pheasant larvae have the property of finding a hiding place immediately, and it was confirmed that they would all sink into the fry protection reef simply by releasing from the upper sea area where the fry protection reef was installed.
In addition, scorpion fish, pheasant groupfish, and cucumbers with a body length exceeding 20 cm are inhabited in the nearby sea area, but no intrusion into the fry protection and reef was confirmed, and prevention of food damage by the protector was effective.
In the breeding case, it was confirmed that the same fry stayed in the fish nest for a long time, and it was confirmed that it was effective in preventing the diffusion of the fixed fry that took territory behavior. In addition, many marine organisms such as shellfish, crustaceans, polychaetes, isopoda, etc. have been confirmed in the feed breeding section and are considered to have a function as a feeding area. As a result, it was confirmed that the early dissipation of fry due to lack of food could be prevented.

  The present invention protects larvae such as pheasant groupers that are artificially grown and are unfamiliar with the natural environment while acclimatizing them to the natural environment, and cultivating them to a growth stage that does not correspond to the predation of large predatory fish inhabiting the released waters Therefore, it is possible to provide a fry protection reef that can increase the survival rate of released fry and promote the coastal fishery by increasing the survival rate.

DESCRIPTION OF SYMBOLS 1 Fry protection and breeding reef 2 of Embodiment 1 External frame 2a External vertical column 3 Internal frame 3a Upper frame material 3b Lower frame material 3c Horizontal material 3d Internal vertical column 3e Upper top plate 3g Frame material 3h Middle shelf 3i Lower Bottom plate 3j Light-shielding part 3k Middle part frame material 5 Protection section 6 Natural stone 7 Upper protection body 8 Side protection body 9 Side part prevention body 10 Bottom part prevention body 11 Internal side protection body 12 Growth section 13 Steel pipe material 14 Open hole 15 Both ends opening 16, 16a Feed breeding part 16 'Feed breeding material 16a-1 Opening 17, 17a, 17b Fish nest part 18 Opening part 19 Hole part 20 Fry protection and reef 21 of embodiment 2 Concrete base 23 Thinning material 24 Reticulated retaining material 25 Bundling body 26 Side surface protection body 27 Raising case 28 Glass foam material 29 Shell piece 30 Fixture 40 Fry protection and reef of Example 1

Claims (3)

  An external housing framed in a hexahedral shape with a structural material such as steel, and an internal housing that is formed in a rectangular cylinder shape with the structural material inside the outer housing and connected to the external housing with a horizontal member. And a breeding section having a fish nest part and / or a food breeding part disposed inside the inner body, and a food culture material disposed in a protective section between the inner side of the outer body and the inner body And a protective body having a mesh opening that prevents large predatory fish that are stretched or fixed on each of the six surfaces of the outer body and / or the inner body from passing through.   A fish nest formed in a tube, a rectangular parallelepiped, a truncated pyramid, a truncated cone or the like having one or more apertures formed in a size that allows fry to enter and exit in the breeding section of the inner enclosure And a food breeding section such as a natural stone, a shell piece, a concrete piece, a steel slag piece, a glass foam material, and the like disposed on the upper side or the lower side of the fish nest part. Fry protection and reef.   The feed culture material disposed in the protection compartment is a thinning material and / or tube material surrounded by a mesh-like protection material, and the feed culture material is disposed and fixed in a multistage multi-row in the protection compartment. The fry protection and breeding reef according to claim 1 or 2, characterized in that.

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