JP2004105129A - Artificial fishing ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial ground capable of relatively readily being built in the ocean, bay, lake, etc., in which the bottom quality is worsened by deposition of bottom mud, without postulating the present of shore and ensuring the environment suitable for habitat of fishes and shellfishes, marine algae, etc., over a long period after the building. <P>SOLUTION: In the artificial fishing ground 1, a surrounding bank 4 highly protruded from the bottom 3 of the sea 2 and forming nearly hexagonal shape when viewed from a plan is built in the bottom 3 of the sea 2 and a modified bottom 8 is formed by removing deposited bottom mud in an area enclosed by the surrounding bank 4 and spraying a bottom-improving material and tilling the bottom. The surrounding bank 4 has a shape considering the influence of water flow direction and the bank 4 is built by piling up a plurality of sandbags 5, covering the upper surfaces of sandbags 5 with a net 6a or a rope 6b and fixing the periphery of the net 6a and the end of the rope 6b with wood piles 7 driving into the bottom 3 of the sea 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an artificial fishing ground that is constructed using the bottom surface of the ocean, lakes, and the like.
[0002]
[Prior art]
Traditionally, many benthic organisms and seafood lived in the seas near Japan, inland seas, bay seas and lakes, and have been a treasure trove of local fishery resources. There have been many reports of significant declines.
[0003]
There are various factors that can cause this drastic decrease in catch, and there are also causes specific to the region, so it cannot be determined in general. However, as fishermen have pointed out, it depends on the mud that accumulates on the bottom. Various organisms living on the bottom surface due to the deterioration of bottom sediment have been reduced and killed, fish and shellfish using these as food have drastically decreased, and the natural environment cycle such as water purification by these bottom rod organisms has changed. Is considered to be one of the major causes of the sharp decline in catch.
[0004]
Therefore, in order to recover from the sluggish fishing in the near sea and inland sea, a submerged dike is constructed in the sea area close to the coast, and the seabed surrounded by the dike is artificially improved, so that the water level is relatively flat. Of shallow seawater that is shallow and suitable for the breeding of abalone, sazae, sea urchin, sea cucumber, etc. that use these seaweed as food, and coastal useful seafood that gradually descends toward the offshore and gradually becomes deeper There is a technique for constructing an ocean area suitable for breeding to make an artificial fishing ground capable of cultivating fishery (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP 09-117234 A (page 2-6)
[0006]
[Problems to be solved by the invention]
The artificial fishing ground described in Patent Document 1 artificially improves a part of the sea area close to the coast and is premised on the existence of the coast. Can not do it.
[0007]
In addition, since the artificial fishing ground does not have a function to prevent sediment deterioration due to sediment accumulation, etc., when constructed on the seabed where sediment degradation has progressed due to sediment accumulation as described above, As time elapses, bottom mud gradually accumulates again in the artificial fishing ground, which may make it impossible for fish and shellfish to live.
[0008]
The problem to be solved by the present invention can be constructed relatively easily without assuming the existence of a shore in the ocean, bay sea, lakes, etc., where the sediment quality has deteriorated due to sedimentation of bottom mud, It is to provide an artificial fishing ground that can secure an environment suitable for the habitat of seafood, seaweed and the like for a long time after construction.
[0009]
[Means for Solving the Problems]
An artificial fishing ground of the present invention includes a surrounding dam formed so as to form a figure projecting higher than the bottom surface and having a closed plan shape on the bottom surface of the ocean, bay sea, and lake, and a region surrounded by the surrounding dam. It is characterized by that.
[0010]
By adopting such a configuration, a part of the bottom surface is surrounded by a Go bank that protrudes higher than this, so the swirling water flow based on the current that naturally occurs in the ocean, bay sea, and lakes It is generated in the enclosed area, and the bottom mud present in the Go bank is rolled up and discharged outside the Go bank. Therefore, the floating mud near the bottom of the surrounding area and the accumulation of bottom mud are greatly reduced in the area surrounded by the Go bank, and the sediment quality is improved in the area surrounded by the Go bank. As a result, the habitat and breeding of various benthic organisms that feed on seafood become possible, and the ecosystem is restored, ensuring an environment suitable for the habitat of seafood, seaweeds, etc. for a long time after construction. can do.
[0011]
In addition, it is only necessary to form a closed embankment that forms a closed figure in a plan view that protrudes higher than this on the bottom of the ocean, etc. Even if there is, it can be constructed without assuming the existence of the shore.
[0012]
Here, if sediment bottom mud in the area surrounded by the Go bank is removed to form a modified bottom surface, the bottom quality can be improved more quickly than when relying on bottom mud discharge by swirling water flow based on natural water flow. Therefore, after construction, an environment suitable for habitat such as seafood and seaweed can be secured at an early stage.
[0013]
In this case, according to the construction conditions, etc., after forming a closed bank with a closed shape in plan view on the bottom of the ocean, etc., the bottom sediment of the area surrounded by the closed bank is removed by dredging. A method of forming a shape or a closed embankment that forms a closed bottom shape so as to surround the modified bottom after forming a modified bottom by removing dredged sediment from the bottom area of the bottom such as the ocean Any of the construction methods for forming can be employed.
[0014]
An artificial fishing ground that does not adversely affect the natural environment can be constructed by a relatively simple operation and a short-term process by forming the Go bank with a plurality of sandbag aggregates or fence-like members. When forming a Go dyke with aggregates of water, it is possible to fill the sandbag with dredged and dewatered bottom mud from the surrounding sea area, so that dredged bottom mud can be reused without being dumped as industrial waste . In addition, when the Go bank is formed with a fence-like member, the construction can be facilitated because the weight can be reduced as compared to the sandbag, and the Go work can be easily corrected and removed.
[0015]
Here, by plowing the modified bottom surface surrounded by the Go bank, the bottom layer is stirred and mixed, and dissolved oxygen in the water is also supplied. And habitat for seaweeds. The plowing work may be performed in a state where the modified bottom surface is submerged or in a state where the modified bottom surface is exposed to the atmosphere. For example, it is desirable to use an auger-type tilling machine having a spiral-shaped tilling implement or a wing-type tilling machine using jet water together.
[0016]
In addition, by dispersing and mixing the bottom sediment improvement material on the modified bottom surrounded by the Go bank, the bottom sediment that cannot be recovered in its natural state is positively improved. Since a suitable environment can be prepared in a short period of time, an artificial fishing ground can be constructed early. In addition, it is desirable that the bottom quality improving material is sprayed during the tilling work, so that the bottom quality improving material can be uniformly dispersed and mixed on the modified bottom surface.
[0017]
In this case, the height of the modified bottom formed in the Go embankment can be adjusted by the application amount of the bottom sediment improvement material, so the depth of the construction site, the strength of the water current, the type of seafood to live in, The height of the modified bottom surface can be set according to the size.
[0018]
On the other hand, the height of the modified bottom surface formed in the Go bank can be made substantially the same as the height of the Go bank. With such a configuration, the modified bottom surface rises higher than the bottom surface around the Go bank. Since the speed of the natural water flow passing over the reformed bottom surface is greater than the speed of the natural water flow passing over the surrounding bottom surface, floating mud flows into the reformed bottom surface, or bottom mud accumulates. Can be prevented.
[0019]
As the bottom material improving material, a water-insoluble granular material, a water-insoluble porous granular material, a water-soluble material mainly composed of calcium / magnesium and the like are desirable. By using water-insoluble particulate matter, the particle size composition of the modified bottom surface can be improved to such a level that can be inhabited by benthic organisms. In addition to being able to increase the number of benthic organisms, it is possible to adjust the particle size of the bottom sediment in the same manner as the granular material. In addition, if a water-soluble substance mainly composed of calcium and magnesium is used, the pH of the modified bottom surface can be adjusted, the activity of microorganisms can be controlled, and the generation of hydrogen sulfide from the bottom surface constituent layer can be suppressed. Can do.
[0020]
As the water-insoluble granular material, seabed sand, riverbed gravel, crushed stone aggregate, glass particles, glass beads and the like are suitable, and as the water-insoluble porous granular material, porous foamed glass particles, porous Natural minerals (natural gravel, shirasu, fall pumice, etc.) and porous artificial minerals (blast furnace slag, coal ash, etc.) are suitable, and water-soluble substances mainly composed of calcium and magnesium include slaked lime and seawater extracted minerals. For example, clear water (trade name) manufactured by Ube Materials Co., Ltd. can be used. As the porous foam glass particles, Miracle Sol (trade name) manufactured by Nippon Construction Technology Co., Ltd. or Construction Environment Engineering Co., Ltd. can be used.
[0021]
On the other hand, if the bottom mud that has been drained from the bottom surface is used as the sandbag filler, it is not necessary to carry the filler from the land, so that the number of man-hours for construction work can be reduced. In addition, since the deteriorated bottom mud is used at the construction site, the generation of industrial waste can be eliminated.
[0022]
In addition, the shape of the Go embankment in plan view is a polygon, ellipse, spindle, or ellipse that is long in the direction of water flow, so that it naturally occurs in oceans, tidal currents, lake bottoms, etc. In addition to preventing floating mud from flowing into the Go bank, even if floating mud flows into the Go bank, the water stream can quickly move outside. Released.
[0023]
Furthermore, it is also possible to lay a net-like body that covers at least a part of the area surrounded by the go bank. By laying such a mesh body, it is possible to prevent the invasion of organisms larger than the mesh of the mesh body, thus preventing the invasion of seafood and the like that may harm the organisms living in the area surrounded by the surrounding embankment can do. In this case, the size of the mesh of the reticulate body can be determined according to the size of the seafood to be prevented from entering.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view schematically showing an artificial fishing ground according to the first embodiment of the present invention, and FIG. 2 is a vertical sectional view of the artificial fishing ground shown in FIG.
[0025]
The artificial fishing ground 1 of the present embodiment forms a surrounding dam 4 that protrudes higher than the bottom surface 3 and has a substantially hexagonal shape in plan view on the bottom surface 3 of the sea 2. Then, the modified bottom surface 8 is formed by spraying the bottom quality improving material and plowing. The Go embankment 4 has a shape that takes into account the influence of the water flow direction, etc., and a plurality of sandbags 5 are stacked, the upper surface thereof is covered with a net 6a and a rope 6b, and the periphery of the net 6a and the end of the rope 6b are placed on the bottom surface 3. It is constructed by fixing it to the driven pile 7.
[0026]
As a result, the modified bottom surface 8 from which the sedimentary bottom mud has been removed and the bottom sediment improving material has been dispersed and mixed is surrounded by the surrounding embankment 4 that protrudes higher than the modified bottom surface 8. Since the movement of the bottom mud 10 is blocked by the Go bank 4, and the floating mud 9 and the bottom mud 10 can be prevented from flowing into the area surrounded by the Go bank 4, the accumulation of the bottom mud 10 is greatly reduced. Can be reduced.
[0027]
As a result, the sediment in the area surrounded by the Go bank 4 is greatly improved, and the bottom surface of the modified bottom surface 8 is able to inhabit and breed various benthic organisms that feed on the fish and shellfish 11, thereby restoring the ecosystem. Therefore, after construction of the artificial fishing ground 1, it is possible to ensure an environment suitable for habitat such as seafood 11 and seaweed 12 over a long period of time.
[0028]
In addition, the artificial fishing ground 1 forms a hexagonal Go embankment 4 which is one of the figures whose plan view is closed on the bottom surface 3 of the sea 2, removes sediment bottom mud, and forms a modified bottom surface 8. Therefore, even in the sea 2 where the bottom sediment is deteriorated due to the accumulation of the bottom mud 10, it can be constructed relatively easily without assuming the existence of a shore. In addition, the artificial fishing ground 1 has a hexagonal shape so as to surround the reformed bottom surface 8 after removing the sediment bottom mud in the predetermined region of the bottom surface 3 and forming the modified bottom surface 8 in the reverse procedure to the above. It can also be constructed by forming the Go bank 4.
[0029]
Since the Go bank 4 is formed by covering a plurality of sandbags 5 with a net 6a, it is possible to construct an artificial fishing ground 1 that does not adversely affect the natural environment by a relatively simple process. Dissipation of the sandbag 5 in the ocean 2 where the influence of waves is great can be prevented.
[0030]
Further, the modified bottom surface 8 surrounded by the Go bank 4 has been plowed, so that the bottom layer is stirred and mixed, and dissolved oxygen in the sea is also supplied, so that the bottom organisms are activated. The habitat environment of the seafood 11 and the seaweed 12 can be improved.
[0031]
Further, the modified bottom surface 8 surrounded by the Go bank 4 is a sand foam 13 which is a water-insoluble granular substance and a porous foam which is a water-insoluble porous granular material as a bottom material improving material during tilling. Because it is dispersed and mixed with glass grains 14 and minerals extracted from seawater, which is a water-soluble substance mainly composed of calcium and magnesium, it actively improves the bottom sediment that cannot be modified by itself. It is possible to prepare an environment suitable for living and breeding of living organisms in a short period of time, and early construction of the artificial fishing ground 1 can be achieved. Since these bottom quality improving materials were dispersed during the tillage work, they could be uniformly dispersed and mixed on the modified bottom surface 8.
[0032]
In this case, the sand 13 dispersed and mixed on the modified bottom surface 8 can secure the particle size of the bottom soil preferred by fish and shellfish, and the porous foamed glass particles 14 have a large number of pores serving as a place for submerged microorganisms. Since it has, it is possible to increase the number of benthic organisms and, like the sand 13, it contributes to the particle size adjustment of the sediment. In addition, by dispersing and mixing water-soluble substances mainly composed of calcium and magnesium, the modified bottom surface 8 is kept weakly alkaline for a long period of time, the bacteria are activated and the decomposition of sludge proceeds, and hydrogen sulfide is added. Propagation of sulfate-reducing bacteria to be generated can be suppressed. In this embodiment, when Miracle Sol (trade name) manufactured by Nippon Construction Technology Co., Ltd. and Construction Environment Engineering Co., Ltd. is used as the porous foam glass particle 14, the number of benthic organisms increases, Excellent effects such as a particle size adjusting function were obtained.
[0033]
In addition to sand 13, glass particles, crushed fine aggregates, glass beads, etc. can be used as the water-insoluble particulate material, and the water-insoluble porous particulate material is porous in addition to porous foam glass particles. Natural minerals such as shirasu and fallen stones or porous artificial minerals such as blast furnace slag and coal ash can also be used. As a water-soluble substance mainly composed of calcium and magnesium, slaked lime, seawater extract mineral agent, and the like can be used. In this embodiment, when clear water (trade name) manufactured by Ube Material Co., Ltd. is used, The modified bottom surface 8 could be kept weakly alkaline for a long period of time, the growth of sulfate-reducing bacteria was suppressed, and the generation of hydrogen sulfide from the sediment could be suppressed.
[0034]
On the other hand, in this embodiment, since the bottom mud that has been dehydrated from the bottom surface 3 is used as the filler for the sandbag 5, it is not necessary to carry in the filler from the land, and the number of man-hours for construction work can be reduced. In addition, it is possible to obtain an excellent effect that the deteriorated bottom soil 3 can be effectively used without being disposed of as industrial waste.
[0035]
In addition, since the shape of the Go embankment 4 in plan view is a long, substantially hexagonal shape along the direction of the tidal current 15 in consideration of the tidal current 15 in this water area, the influence on the tidal current 15 that naturally occurs in the sea 2 is minimized. It is possible to suppress the inflow of the floating mud 9 and the like, and even if the floating mud 9 or the like flows into the go bank 4, it is quickly discharged to the outside by the tidal current 15. An effect is obtained.
[0036]
Next, FIG. 3 is a vertical sectional view schematically showing an artificial fishing ground 20 according to a second embodiment of the present invention. In FIG. 3, the portions denoted by the same reference numerals as those in FIGS. 1 and 2 are the portions having the same functions and effects as those of the artificial fishing ground 1 described above, and thus description thereof is omitted.
[0037]
The artificial fishing ground 20 of the present embodiment has a bottom surface 3 surrounded by the surrounding bank 21 formed on the bottom surface 3 of the sea 2 by a fence-like member 22 formed with a fence-like member 22 that is higher than the bottom surface 3 and has a closed plan view. It is formed by removing the bottom sediment from the soil, spraying the bottom modifier and plowing it. In the artificial fishing ground 20, the Go dyke 21 is formed by a fence-like member 22 that is much lighter than the sandbag 5. Therefore, when the bottom 3 is a soft ground that tends to cause uneven settlement, the height of the Go dyke 21 is set to the bottom. This is suitable when it is necessary to adjust according to the terrain. Other basic functions and effects are the same as those of the artificial fishing ground 1.
[0038]
In the above embodiment, an example in which the artificial fishing grounds 1 and 20 are constructed on the bottom surface 3 of the sea 2 has been described. However, the artificial fishing ground of the present invention is not limited to these, so the water surface of the sea 2 at low tide. Can be constructed in tidal flats and sandy beaches where the bottom is lower than the bottom surface 3 and can be constructed in oceans such as the ocean and bay seas as well as lakes.
[0039]
Next, an artificial fishing ground 30 according to a third embodiment of the present invention will be described with reference to FIGS. 4 to 6, the same function and effect as those of the artificial fishing ground 1 described above are denoted by the same reference numerals as those in FIGS. 1 and 2, and description thereof is omitted.
[0040]
As shown in FIG. 4, the artificial fishing ground 30 includes a modified bottom surface 8 formed by the above-described procedure, and a substantially hexagonal surrounding dam 31 that protrudes higher than the bottom surface 3 and surrounds the modified bottom surface 8. Is built by. As shown in FIG. 5, the Go bank 31 has sandbags 32 larger than the sandbag 5 arranged in a substantially hexagonal shape, the top of the sandbag 32 is pressed with a rope 34, and the end of the rope 34 is placed on a wooden pile 33 driven into the bottom surface. It is formed by fixing the part.
[0041]
As shown in FIG. 6, the sandbag 32 is formed by filling a bag body called a flexible container formed of a flexible synthetic resin sheet with bottom mud dehydrated from the bottom surface 3. Since the height of one sandbag 32 is equal to the height of the Gobank 31 and the sandbag 32 can be formed by arranging the sandbags 32 in the horizontal direction, the Goke bank shown in FIGS. The Go bank 31 can be formed in a shorter period than four. Moreover, if a construction method in which a plurality of sandbags 31 connected in advance in the horizontal direction is employed, the construction period can be further shortened.
[0042]
In the artificial fishing ground 30, as shown in FIGS. 5 and 6, the height of the surface 8 a of the modified bottom surface 8 surrounded by the surrounding bank 31 is higher than the surrounding bottom surface 3, so that floating mud, etc. Is excellent in the function of preventing inflow or accumulation in the Go bank 31. Other basic functions and effects are the same as those of the artificial fishing ground 1.
[0043]
In the case of the artificial fishing ground 30, as shown in FIG. 5, it is also possible to lay a net-like body 35 that covers the area surrounded by the surrounding dam 31, thereby harming the organisms living on the modified bottom surface 8. Can prevent the intrusion of seafood. The mesh size of the net-like body 35 can be set according to the size of the seafood to be prevented from entering.
[0044]
Next, with reference to FIGS. 7-9, the artificial fishing ground 40 which is 4th Embodiment of this invention is demonstrated. 7-9, the part which demonstrates the same function and effect as the artificial fishing ground 1 mentioned above attaches | subjects the same symbol as FIG. 1, FIG. 2, and abbreviate | omits description.
[0045]
As shown in FIGS. 7 and 8, the artificial fishing ground 40 is formed in the rectangular surrounding ridge 41 formed so as to protrude higher than the bottom surface 3, and in the region surrounded by the surrounding ridge 41, according to the procedure described above. And a modified bottom surface 8. As shown in FIGS. 8 and 9, the go bank 41 is formed by vertically fixing a wooden board 44 to wooden piles 42 and 43 driven into the bottom surface 3.
[0046]
Also in the artificial fishing ground 40, since the surface 8a of the modified bottom surface 8 is set higher than the surrounding bottom face 3, the same function and effect as the artificial fishing ground 30 described above are exhibited, but the tree is much lighter than the sandbag. Since the surrounding bank 41 is formed by the piles 42 and 43 and the wooden board 44, the height of the surrounding bank 41 needs to be adjusted according to the bottom topography when the bottom surface 3 is a soft ground that is likely to cause uneven settlement. It is suitable for the case and the removal work and the moving work are relatively easy. Other basic functions and effects are the same as those of the artificial fishing ground 1.
[0047]
Next, with reference to FIG. 10, FIG. 11, the artificial fishing grounds 50 and 60 which are the 5th and 6th embodiment of this invention are demonstrated. 10 and 11, the same function and effect as those of the artificial fishing grounds 30 and 40 described above are denoted by the same reference numerals as in FIGS. 4 to 9, and description thereof is omitted.
[0048]
The artificial fishing ground 50 shown in FIG. 10 is similar to the artificial fishing ground 30, the Go bank 51 formed so as to protrude higher than the bottom surface 3 by arranging the sandbags 32, and the modified bottom surface formed in the Go bank 51 in the above-described procedure. 8 and built.
[0049]
The artificial fishing ground 60 shown in FIG. 11 is formed in the same manner as the artificial fishing ground 40 in the above-mentioned procedure in the Go bank 61 formed by attaching the wooden board 44 to the wooden piles 42 and 43 driven into the bottom surface 3. The modified bottom surface 8 is constructed.
[0050]
In the artificial fishing grounds 50 and 60, the surface 8 b of the modified bottom surface 8 is substantially the same as the height of the surrounding dams 51 and 61, so the modified bottom surface 8 is raised higher than the bottom surface 3 around the surrounding dams 51 and 61. It has become. As a result, the speed of the natural water flow passing over the reformed bottom surface 8 becomes larger than the speed of the natural water flow passing over the surrounding bottom surface 3, so that floating mud flows into the reformed bottom surface 8, Can be prevented from being deposited. Other basic functions and effects are the same as those of the artificial fishing grounds 30 and 40, respectively.
[0051]
【The invention's effect】
The present invention has the following effects.
[0052]
(1) The bottom of the ocean, the gulf sea, and the lake are provided with a go bank formed so as to form a figure projecting higher than the bottom face and having a closed shape in plan view, and a region surrounded by the go bank. Artificial fishing grounds can be constructed relatively easily in oceans, bay seas, lakes, etc., where the sediment quality has deteriorated due to mud accumulation, without assuming the presence of shores. It is possible to secure an environment suitable for the habitat of seafood and seaweed.
[0053]
(2) If sediment bottom mud in the area surrounded by the Go bank is removed and used as a modified bottom surface, the sediment quality can be improved more quickly than when relying on bottom mud discharge by swirling water flow based on natural water flow. Therefore, an environment suitable for habitat of seafood, seaweeds, etc. can be secured early after construction.
[0054]
(3) By forming the Go dyke with a plurality of sandbags or fence-like members, it is possible to construct an artificial fishing ground that does not adversely affect the natural environment with relatively simple work and short-term processes, When forming a Go dyke with sandbags, dredged mud can be reused without being dumped as industrial waste, and when forming a Go dyke with fence-like members, construction can be made easier because the weight can be reduced compared to sandbags. It is easy to modify and remove the bank.
[0055]
(4) By plowing the modified bottom surface surrounded by the Go bank, the bottom layer is agitated and mixed, and dissolved oxygen in the water is also supplied. And habitat for seaweeds.
[0056]
(5) By dispersing and mixing the bottom improvement material on the modified bottom surrounded by the Go bank, the bottom sediment that cannot be recovered in its natural state is positively improved. Since an environment suitable for fishing can be prepared in a short period of time, an artificial fishing ground can be constructed at an early stage.
[0057]
(6) If the height of the modified bottom surface in the Go bank is approximately the same as the height of the Go bank, the modified bottom surface rises higher than the bottom surface around the Go bank, and the natural water flow that passes over the modified bottom surface Since the velocity is larger than the velocity of the natural water flow passing over the surrounding bottom surface, floating mud can be prevented from flowing into the reformed bottom surface and sediment can be prevented from accumulating.
[0058]
(7) If a water-insoluble granular material is used as the bottom material improving material, the particle size composition of the modified bottom surface can be improved to a particle size that can be inhabited by benthic organisms. Can be used as an inhabitant for aquatic microorganisms and can increase the number of benthic organisms, and can adjust the particle size of the bottom sediment. If a water-soluble substance mainly composed of calcium and magnesium is used, the modified bottom surface can be used. PH adjustment is possible, the activity of microorganisms can be controlled, and the generation of hydrogen sulfide from the bottom surface constituting layer can be suppressed.
[0059]
(8) If the bottom mud dripped from the bottom is used as the filler for the sandbag, it is not necessary to carry in the filler from the land. Therefore, it is possible to eliminate the generation of industrial waste.
[0060]
(9) By making the shape of the Go embankment in a plan view with a long polygonal shape, an elliptical shape, a spindle shape, and an oval shape along the direction of the water current, it can naturally occur in oceans, tides, lake bottoms, etc. Since the influence on the generated water flow can be suppressed to the minimum, it is possible to prevent floating mud and the like from flowing into the Go bank, and even if floating mud flows into the Go bank, Can be released.
[0061]
(10) If a net-like body that covers at least a part of the area surrounded by the Go bank is laid, other fish and shellfish that may harm living organisms living in the area surrounded by the Go bank Intrusion can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an artificial fishing ground according to a first embodiment of the present invention.
FIG. 2 is a vertical sectional view of the artificial fishing ground shown in FIG.
FIG. 3 is a vertical sectional view schematically showing an artificial fishing ground according to a second embodiment of the present invention.
FIG. 4 is a perspective view showing an artificial fishing ground according to a third embodiment of the present invention.
FIG. 5 is a vertical sectional view of the artificial fishing ground shown in FIG. 4;
6 is a partially enlarged view of FIG. 5;
FIG. 7 is a plan view showing an artificial fishing ground according to a fourth embodiment of the present invention.
FIG. 8 is a vertical partial sectional view of the artificial fishing ground shown in FIG. 7;
FIG. 9 is a partial perspective view of a Go bank that constitutes the artificial fishing ground shown in FIG. 7;
FIG. 10 is a vertical partial sectional view showing an artificial fish farm according to a fifth embodiment of the present invention.
FIG. 11 is a vertical partial sectional view showing an artificial fishing ground according to a sixth embodiment of the present invention.
[Explanation of symbols]
1,20,30,40,50,60 Artificial fishing ground 2 Sea 3 Bottom 4, 21, 31, 41, 51, 61 Go bank 5, 32 Sandbag 6a Net 6b, 34 Rope 7, 33, 42, 43 Wood pile 8 Modified bottom surface 8a, 8b Surface 9 Floating mud 10 Bottom mud 11 Seafood 12 Seaweed 13 Sand 14 Porous foam glass particle 15 Tidal current 22 Fence-like member 35 Net-like body 44 Wood board

Claims (10)

An artificial dam comprising a surrounding dam formed so as to form a figure projecting higher than the bottom surface and having a closed plan shape on the bottom surface of the ocean, bay sea, and lake, and a region surrounded by the dam Fishing grounds. The artificial fishing ground according to claim 1, wherein sediment bottom mud in a region surrounded by the Go bank is removed to form a modified bottom surface. The artificial fishing ground according to claim 1 or 2, wherein the go bank is formed of a plurality of sandbags or a fence-like member. The artificial fishing ground according to claim 2, wherein the modified bottom surface is plowed. The artificial fishing ground according to claim 4, wherein a bottom quality improving material is dispersed and mixed on the modified bottom surface. The artificial fish farm according to claim 5, wherein the height of the modified bottom surface is substantially the same as the height of the Go bank. The artificial material according to claim 5 or 6, wherein any one or more of a water-insoluble granular material, a water-insoluble porous granular material, and a water-soluble material mainly composed of calcium and magnesium are used as the bottom material improving material. Fishing grounds. The artificial fishing ground according to claim 3, wherein bottom mud dripped from the bottom surface is used as the filler for the sandbag. The artificial fishing ground according to any one of claims 1 to 8, wherein the shape of the Go bank in plan view is a polygonal shape that is long along the water flow direction, an elliptical shape, a spindle shape, or an oval shape. The artificial fishing ground in any one of Claims 1-9 which laid the net-like body which covers at least one part of the area | region enclosed by the said Go bank.

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