WO2006121075A1 - Method of aquafarming fishes or shellfishes - Google Patents

Abstract

It is intended to provide a method of aquafarming fishes or shellfishes whereby the growth of the fishes or shellfishes can be promoted and an aquafarm can be effectively utilized while neither requiring a complicated apparatus, exerting undesirably effects on the natural environment nor worsening the bottom qualities or the water qualities. An aquafarming farm (80) has a preserve (50), which consists of a raft (51) putting on a certain sea area and a net (52) provided under the sea below it, and a controlling system (70) formed on a raft (71) located adjacent to the preserve (50). A large number of red sea breams (53) are fed within the net (52) in the preserve (50). A microbubble generator (1) is provided in the seawater in the preserve (50) and a large amount of capitellidae (55) are distributed at the bottom (54a) of the sea area in which the preserve (50) is formed. By supplying electricity and air from a power generating machine (72) and an air pump (73) on the raft (71) into the microbubble generator (1), seawater containing microbubbles (NB) is supplied into the seawater (W) in the preserve (50).

Description

 Specification

 Fish shell culture method

 Technical field

 [0001] The present invention relates to a method for culturing fish and shellfish that can be carried out in various waters such as seawater such as coastal waters of the ocean or fresh water such as rivers and lakes.

 Background art

 [0002] In the coastal waters of various parts of Japan, traditionally, aquaculture and fisheries have been run to cultivate and ship shellfish such as Thailand, yellowtail, pufferfish, prawns, or scallops, abalone, and oysters. In these fish farms, a large amount of food residue distributed on the surface of the sea and the excrement of fish shellfish being raised are generated, and a large amount of organic matter is deposited at the bottom of the sea area. A large amount of organic matter deposited on the sea floor generates harmful hydrogen sulfide during the summer high water temperature due to anaerobic decomposition process, so the sea floor is contaminated with a large amount of organic sludge (sludge) that cannot be inhabited by organisms. It has a serious adverse effect on the growth of fish and shellfish in the farm. In particular

In places where fish farming is carried out in topographically closed inner bays, feeding fish farms has the effect of adding dissolved substances to the water and loading organic matter on the seabed, which has a strong impact on water quality and sediment quality. It is exerting. In addition, fresh water areas such as rivers and lakes, or estuaries and inner bays where the brackish water that is formed by mixing fresh water and sea water flowing in from rivers and other areas is present constantly or seasonally (so-called brackish water areas). ), The quality of the bottom and water quality are deteriorated due to the deterioration of water quality due to domestic and industrial wastewater, or the accumulation of organic sludge.

 [0003] By the way, in the fish farm! In the fall when the seawater temperature falls, convection occurs in the nearby sea area, and oxygen is supplied to the organic sludge on the seabed. The activity of bentos (benthic organisms) that use organic sludge as a nutrient source is activated, and the organic sludge is purified by this life activity. Therefore, the present inventor proposed a technique for efficiently cultivating a large amount of benthos by spreading it on the bottom of the organic sludge on the seabed and efficiently purifying the organic sludge using the organic matter consumption of these bentos. (For example, see Patent Document 1).

) o [0004] In addition, as a technology for decomposing and purifying organic sludge deposited on the seabed, the dissolved oxygen in the sea is increased by supplying seawater with increased dissolved oxygen or fine bubbles to the sea area near the bottom. Stirring of bottom organic sludge by supplying oxygen into organic sludge (for example, refer to Patent Documents 2 and 3); or by jetting fine-bubble mixed water into organic sludge accumulated at the bottom. There are those that perform tillage and oxygen supply (for example, see Patent Document 4).

 Patent Document 1: Japanese Patent Laid-Open No. 2001-231394

 Patent Document 2: JP-A-8-281292

 Patent Document 3: Japanese Patent Application Laid-Open No. 2004-290893

 Patent Document 4: Japanese Patent Laid-Open No. 2003-250663

 Disclosure of the invention

 Problems to be solved by the invention

 [0006] In the organic sludge purification technology described in Patent Document 1, the activity of benthic organisms is activated when the seawater temperature of the fish farm is low, so that an excellent purification effect can be obtained. However, when the seawater temperature rises, benthic organisms decrease and the purification action is reduced. For this reason, the use of the aquaculture farm must be suspended until the purification of the fish and shellfish has been recovered and the purification action has been restored.

 [0007] In addition, in the case of the sludge purification technology described in Patent Documents 2 and 3, since the particle size of the fine bubbles supplied into the sea by the used means for generating fine bubbles is relatively large, supply to the sea At the same time, it begins to rise, and most of them rise to the sea level and disappear. For this reason, as a result of the relatively short residence time of bubbles in the seawater, oxygen cannot be sufficiently dissolved in the seawater, and the oxygen supply action into the organic sludge is insufficient. In particular, in seawater that receives a greater buoyancy than fresh water, the rate of bubbles rises faster, so it is not possible to obtain a sufficient oxygen supply effect.

[0008] Further, in order to increase the amount of oxygen supplied to the organic sludge at the bottom of the sea area using the sludge purification technology described in Patent Documents 2 and 3, the fine bubble generating means is placed directly above the bottom. Must be placed. For this reason, as a result of the length of power piping and wiring such as water supply means and air supply means placed on the sea surface or on the sea (ground), the structure that supports these wirings and pipes is also required. Necessary, increasing the size and complexity of the equipment.

 [0009] On the other hand, in the case of the water bottom tillage system described in Patent Document 4, oxygen can be efficiently supplied into the organic sludge deposited on the sea bottom, but the water is wound up by the water mixed with fine bubbles that are injected by the injection nozzle force. Since the seawater in the surrounding waters is polluted by sludge, it cannot be used in fish farms that are susceptible to adverse effects on growth by contaminated seawater.

 [0010] The problem to be solved by the present invention is that it does not require complicated equipment, and can promote the growth of fish and shellfish without adversely affecting the natural environment or deteriorating the bottom and water quality. The object of the present invention is to provide a method for culturing fish and shellfish that can also be used effectively for aquaculture.

 Means for solving the problem

 [0011] In the fish shellfish cultivation method of the present invention, the fine bubble generating means with a built-in fluid swirl chamber is arranged in the water area to be purified, and water and air are supplied to the fine bubble generating means to supply the fluid swirl. The water area purified by supplying oxygen to the benthic organisms that inhabit the bottom of the water area while supplying water mixed with fine bubbles generated by the fluid swirl flow formed in the room into the water area. It is characterized by breeding fish and shellfish.

 [0012] With such a configuration, the fine bubbles supplied together with water from the fluid swirl chamber of the fine bubble generating means diffuse into the water and settle down toward the bottom of the water area. Oxygen is supplied to water and the bottom layer, and oxygen is also supplied to benthic organisms that inhabit the bottom because there is no anoxic region. As a result, the life activity of benthic organisms is remarkably activated and its organic matter decomposition ability is increased, so that organic matter sludge at the bottom of the water area is efficiently purified, and water quality is improved and the amount of dissolved oxygen in water is increased. Can be planned.

[0013] Therefore, organic sludge caused by bait distributed at the farm and fish and shellfish excrement will not accumulate at the bottom of the water area, and the water area will be purified and the amount of dissolved oxygen in the water will increase. The growth of fish and shellfish bred in the water can be promoted. In addition, it has been necessary to at least once during the season to clean organic sludge deposited on the bottom of the soil, and the suspension period of the farm is no longer necessary, allowing continuous use of the farm. Therefore, the farm can be used effectively and the efficiency is improved. In addition, water containing fine bubbles may be supplied to the water area using the means for generating fine bubbles placed in the water area to be purified. Therefore, it does not require complicated equipment and does not adversely affect the natural environment.

 [0014] It should be noted that halophilic bacteria, EM bacteria, nitrifying bacteria, etc. are distributed at the bottom of the water area where the fish shellfish cultivation method is to be carried out, and water mixed with fine bubbles by the fine bubble generating means is distributed to the water area. If the supply is performed, the purification action is further improved. Here, EM bacteria is an abbreviation of Effective Microorganisms bacteria, and means a group of microorganisms effective for decomposing organic matter including lactic acid bacteria, yeasts, radioactive bacteria, filamentous fungi, and photosynthetic bacteria.

 [0015] On the other hand, the present inventor has cultivated a large amount of bentos in advance, and actively sprinkles this on the organic sludge on the seabed in the fall, where organisms can inhabit, thereby We have obtained knowledge that organic sludge can be efficiently purified using power consumption (for example, refer to Patent Document 1). O Bentos is known as Spioaceae and small polychaete, Among them, swordfish (Capitella sp. 1) are known to appear at high density in organic polluted areas and to multiply explosively during the recovery of sludge environmental conditions. Thus, as a result of intensive studies on the ecology of the swordfish, the present inventor has completed the present invention.

 [0016] Carabidae belong to small polychaetes (annular animals), and are filamentous organisms with an adult body length of about 10 mm and a maximum diameter of about 1 mm. In summer, when the seafloor environment has become extremely anaerobic, the growth rate is extremely slow.However, if the seafloor environment recovers during winter and winter, the water temperature becomes 10-15 ° C and the dissolved oxygen in the bottom water becomes saturated or close to that. It grows to adults in about 4 to 6 weeks, and shows explosive growth ability by repeated breeding. In addition, in the process of growth, bacteria with organic matter resolving ability that coexist with cynomolgus species (hereinafter referred to as “organic degradation bacteria”) also grow, and these organic matter decomposition bacteria use organic matter in organic sludge as a nutrient source. Therefore, sludge can be decomposed and removed by the life activity of organic matter-degrading bacteria.

[0017] Therefore, the fish shellfish cultivation method of the present invention distributes scallops at the bottom of the seawater area that is the target of purification, and provides fine bubble generating means incorporating a fluid swirl chamber on the scallops distribution area. Disposing in the seawater area, supplying seawater and air to the fine bubble generating means to supply seawater mixed with fine bubbles generated by a fluid swirl flow formed in the fluid swirl chamber into the seawater area, and Benthic organisms that inhabit the bottom of water bodies and before It is characterized by breeding fish and shellfish in water that is purified by supplying oxygen to it.

 [0018] With such a configuration, by the fluid swirl flow formed in the fluid swirl chamber by supplying the seawater on the distribution area of the lobster and the air in the atmosphere to the fine bubble generating means. It is possible to supply the generated seawater mixed with fine bubbles to the water area on the distribution area. These microbubbles are extremely fine and contain a large amount of microbubbles with an outer diameter of nanometer level, so the levitation speed is extremely low, and not only the residence time in seawater is long, but also the seabed over time. It also shows the property of sedimentation by force. For this reason, it becomes possible to increase the amount of dissolved oxygen in the seawater near the bottom and eliminate the poor oxygen layer.

 [0019] Therefore, even if the fine bubble generating means is not arranged near the seabed, the amount of dissolved oxygen in the bottom seawater reaches a saturated state, and oxygen is efficiently supplied into the organic sludge on the seabed. Sufficient oxygen is supplied to the benthic organisms and the dispersed beetles that inhabit the area. As a result, the life activity and proliferation ability of the carpenter are activated and the number of the individuals is remarkably increased, so that organic matter-decomposing bacteria that live in the carpenter are also proliferated. For this reason, the organic sludge on the seabed can be efficiently decomposed and purified by the decomposition ability of the organic matter-degrading bacteria grown.

 [0020] In addition, most of the fine bubbles supplied in the sea remain in the seawater for a long time and gradually disappear in the seawater, resulting in an increase in the amount of dissolved oxygen in the seawater. Since the oxygen region disappears, the purification action by aerobic microorganisms is also activated, and this also makes it possible to purify the seawater area. Therefore, if fish and shellfish are cultivated in the sea area thus purified, the life activity of the fish and shellfish is activated and the growth state can be greatly promoted.

[0021] In the present invention, the swordfish distributed on the seabed, along with its symbiotic bacteria, have been living in the natural world since ancient times, and the microbubble generating means is used in the atmosphere for the purpose of providing sufficient oxygen to the swordfish. Since it supplies seawater containing fine bubbles formed from air into the sea, it does not adversely affect the natural environment or fish and shellfish. In addition, it is possible to distribute lobsters on the seabed and use microbubble generation means placed in a relatively shallow sea area. Supply mixed seawater to the sea area, so you don't need complicated equipment.

[0022] Here, as the fine bubble generating means,

 A cylindrical or rotating fluid swirl chamber in which fluid can swivel around an axis, and water is fed into the fluid swirl chamber along a direction that forms a twisted position with respect to the shaft center. A fluid introduction path, an air introduction path provided in communication with the fluid swirl chamber for supplying air into the fluid swirl chamber, and the fluid swirl chamber force for discharging water mixed with fine bubbles. A fine bubble generator having a discharge path provided on an extension line of the shaft center;

 A fine bubble generator comprising: a liquid pump that supplies water into the fluid swirl chamber via the water introduction path; and a gas pump that supplies air into the fluid swirl chamber via the air introduction path. Can be used.

[0023] With such a configuration, by introducing the fine bubble generator into water and supplying water and air respectively to the liquid pump and the gas pump force arranged on the water or on the ground, Since it is possible to supply water containing fine bubbles to water, it is not necessary to use a liquid pump or gas pump having water resistance and corrosion resistance to water, and the equipment can be simplified. In addition, since a plurality of microbubble generators thrown into water can be operated by a set of liquid pumps and gas pumps, it is relatively easy to handle large-scale fish shell farms.

[0024] As the fine bubble generating means,

 A cylindrical or rotating fluid swirl chamber in which a fluid can swivel around an axis, and air-mixed water is fed into the fluid swirl chamber along a direction that forms a twisted position with respect to the shaft center. A microbubble generator comprising: an air / water introduction path arranged as described above; and a discharge path arranged on an extension line of the shaft for discharging water mixed with microbubbles from the fluid swirl chamber;

 A fine bubble generation comprising: a liquid pump for supplying water into the fluid swirl chamber via the air / water introduction path; and a gas pump for supplying air into the fluid swirl chamber via the air / water introduction path. An apparatus can also be used.

[0025] With such a configuration, the fine bubble generator is thrown into water and placed on the water or on the ground. By supplying water and air from the installed liquid pump and gas pump to the air / water introduction path, air mixed with water is supplied to the fine bubble generator via the air / water introduction path, It becomes possible to supply water mixed with fine bubbles into the water. For this reason, it is possible to provide a single piping route to the liquid pump and the gas pumping force fine bubble generator, and to simplify the equipment.

 [0026] Further, as the fine bubble generating means,

 A cylindrical or rotating fluid swirl chamber in which fluid can swivel around an axis, and water is fed into the fluid swirl chamber along a direction that forms a twisted position with respect to the shaft center. A water introduction path, an air introduction path provided in communication with the fluid swirl chamber for supplying air to the fluid swirl chamber, and the shaft for discharging the fluid swirl chamber force water mixed with fine bubbles. A microbubble generator having a discharge path provided on an extension of the heart;

 A waterproof liquid pump for feeding water sucked from a suction port provided in a portion that can be immersed in water into the fluid swirl chamber via the water introduction path;

 A fine bubble generator integrated with a waterproof drive for operating the liquid pump;

 A gas pump for feeding air into the fluid swirl chamber via the air introduction path of the fine bubble generating unit;

 It is also possible to use a fine bubble generator equipped with

[0027] With such a configuration, the microbubble generator is thrown into the water to operate the drive unit, and at the same time, the gas pumping force disposed on the water or on the ground is only supplied to the microbubble generator. Therefore, a fluid swirl flow is formed in the fluid swirl chamber, and water mixed with fine bubbles generated thereby can be supplied to the water, so that the fish shellfish cultivation method can be easily implemented. The microbubble generator has a structure in which the microbubble generator, liquid pump, and drive unit are integrated. Therefore, the piping for the water introduction path can be minimized, and the equipment can be simplified and miniaturized. Can be planned.

 The invention's effect

[0028] According to the present invention, complicated facilities are not required, the natural environment is adversely affected, sediment and water This makes it possible to promote the growth of fish and shellfish that do not deteriorate in quality, and to make effective use of farms.

 Brief Description of Drawings

 FIG. 1 is a schematic configuration diagram showing a fish and shellfish farm using the fish and shellfish cultivation method according to an embodiment of the present invention.

 [FIG. 2] FIG. 2 is a partially enlarged view showing the management system in the fish and shellfish farm shown in FIG.

 FIG. 3 is a partially enlarged view of the vicinity of the microbubble generator shown in FIG.

 FIG. 4 is a partially omitted plan view of the microbubble generator shown in FIG.

 FIG. 5 is a partially cutaway side view showing the fine bubble generator constituting the fine bubble generating apparatus shown in FIG. 3.

 FIG. 6 is a cross-sectional view taken along line AA in FIG.

 FIG. 7 is a cross-sectional view taken along line BB in FIG.

 FIG. 8 is a cross-sectional view taken along line CC in FIG.

 [FIG. 9] FIG. 9 is a cross-sectional view taken along the line DD in FIG.

 FIG. 10 is a cross-sectional view showing another embodiment of the fine bubble generator shown in FIG.

 FIG. 11 is a diagram showing a second embodiment relating to a fine bubble generator.

 FIG. 12 is a perspective view of the fine bubble generator shown in FIG. 11.

 FIG. 13 is a cross-sectional view taken along line EE in FIG.

 FIG. 14 is a schematic view showing an operating state of the fine bubble generator shown in FIG. 11.

 FIG. 15 is a cross-sectional view showing another embodiment of the fine bubble generator shown in FIG. 11.

 FIG. 16 is a perspective view showing a third embodiment relating to a fine bubble generator.

 FIG. 17 is a cross-sectional view taken along line FF in FIG.

 FIG. 18 is a schematic diagram showing an operating state of the fine bubble generator shown in FIG.

 Explanation of symbols

[0030] 1 Microbubble generator

la, 74a wire Liquid pump

a Suction port

 Electric motor

, 4X, 20, 20X, 30 Microbubble generator a Cylindrical casing

 Power cord

 Water discharge part

 Supply pipe

3 Check valve

4, 22, 32 Fluid swirl chamber

4a, 22a Inner peripheral surface

5, 23 Water introduction route

5a Blocking plate

5b spout

5c Connecting part

6, 24 Air introduction route

 a Tip opening

7, 25 Discharge path

7a, 21a Bulkhead

 Guide member

 a plane

 b, 18c Connecting member

 Outlet

 casing

 a Water introduction pipe

 b Water pipe

 a Air inlet pipe

Induction tube 33 Fluid introduction path 33a Fluid introduction pipe 33b Fluid supply pipe

35, 37 Drain pipe 35a, 37a Open / close valve

36, 38 Outlet 50 Sacrificial

51, 71 筏

 52 Net

53 鯛

 54, 54a Bottom 54b Organic sludge 55 Itokai 70 Management system 72 Generator

73 Gas pump 74 Water quality measuring device 74b Sensor 75 Switchboard

76 Solar panel 77a Transmitter 77b Antenna 80 Fish farm NB Microbubbles R Fluid swirl flow S Axis

V Negative pressure cavity W Seawater Wl sea level

 BEST MODE FOR CARRYING OUT THE INVENTION

 [0031] The best mode for carrying out the present invention will be described below with reference to the drawings.

 FIG. 1 is a schematic configuration diagram showing a fish shell farm using the fish shell farming method according to the embodiment of the present invention, and FIG. 2 is a partially enlarged view showing a management system in the fish shell farm shown in FIG. .

 [0032] As shown in FIG. 1, the fish farm 80 according to the present embodiment includes a cage 51 formed in a certain sea area, a cage 50 formed by a net 52 arranged in the sea below the sea, and the like. And a management system 70 provided on the wall 71 arranged adjacent to the living room 50. Inside the net 52 of the ginger 50, a large number of cultivated fish 53 are bred, and the microbubble generator 1 is placed in the sea. (Capitella sp. 1) 55 is distributed. As a result, in the fish farm 80, the fine bubble generating part 1 is placed in the seawater W on the bottom 54a, which is the distribution area of the scallop 55.

 [0033] Itogokai 55 consists of approximately 800,000 to 1,600,000 individuals of the cultivated colony in a plastic bag with sand as a culture substrate, and the diver dives it to the bottom 54a, and then nears the bottom 54a. , And the scallop culture colony was gently spread on the bottom 54a of the soil along with the culture substrate sand. According to the results of water quality observation of seawater W in fish farm 80, the time when organic sludge concentrates and accumulates on bottom 54a occurs when the stratified structure collapses in summer and vertical mixing occurs. Is known. Therefore, it is considered that the most effective timing for purifying the organic sludge 54b is to distribute the cultivated colony at this time.

[0034] The fine bubble generating part 1 arranged in the sacrifice 50 is locked at a fixed position by the wire la, and is operated by the alternating current supplied from the generator 72 constituting the management system 70. The seawater W mixed with fine bubbles NB formed by the seawater W sucked from inside and the air fed from the gas pump 73 is discharged into the sacrifice 50. In this embodiment, the water depth to the bottom 54 of the sea area where the fish farm 80 is provided is about 14 m, and the microbubble generator 1 is located at a depth of 7 m from the sea surface W1. Not something The position of the microbubble generator 1 can be changed by lowering or pulling up the wire la.

[0035] As shown in Fig. 2, the management system 70 on 筏 71 includes a generator 72, a gas pump (air conditioner press) 73, a water quality measuring device 74 that automatically measures the amount of dissolved oxygen in seawater W, and the measurement results. Operate solar panel 76, generator 72, gas pump 73, etc. for charging storage battery (not shown) that operates transmitter 77a and antenna 77b, water quality measuring device 74, transmitter 77a, etc. With a switchboard 75. The water quality measuring device 74 includes a sensor 74b locked to the wire 74a, and the sensor 74b can move up and down in the seawater W by winding up or rolling out the wire 74a. It is possible to automatically measure the water quality of seawater W and the current direction flow velocity at the depth.

 [0036] The measurement result is wirelessly transmitted from the transmitter 77a via the antenna 77b, transferred to a data server on the Internet through a circuit of a cellular phone, and can be viewed on a website at any time. In this embodiment, the vertical profile of the water quality of seawater W is measured every two hours, the vertical profile of the flow direction flow velocity is measured every hour, and the measurement results are transmitted. The conditions are not limited to these.

 [0037] With this configuration, it is possible to monitor the water quality structure and tidal current status of the fish farm 80 within 2 hours of the occurrence of the phenomenon, so the dissolved oxygen in the seawater W with the sacrifice 50 It is possible to monitor the decrease in the volume, verify the effects of the operation and operation of the microbubble generator 1 to prevent the decrease in dissolved oxygen, or monitor the generation of water quality structures that cause organic sludge to accumulate. As a result, it is possible to quickly obtain information essential for the management of the water quality environment of the fish farm 80 and effective operation of the environmental improvement technology.

[0038] Next, the structure and function of the fine bubble generating unit 1 will be described in detail with reference to FIGS. Fig. 3 is a partially enlarged view of the vicinity of the fine bubble generating device shown in Fig. 1, Fig. 4 is a partially omitted plan view of the fine bubble generating device shown in Fig. 3, and Fig. 5 is a fine view of the fine bubble generating device shown in Fig. 3. 6 is a partially cutaway side view showing the bubble generator, FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5, FIG. 7 is a cross-sectional view taken along the line B-B in FIG. Is a cross-sectional view taken along the line D-D in FIG. As shown in FIG. 3 and FIG. 4, the fine bubble generator 1 includes a waterproof liquid pump 2, a waterproof electric motor 3 that is a drive for operating the liquid pump 2, and a fine bubble generator. 4 and are connected together. The electric motor 3 is supplied with power from the generator 72 arranged on the sea anchor 71 (see FIG. 1) via the power cord 5 and can be turned on and off by a switch (not shown) provided on the switchboard 75. it can. The liquid pump 2 is coaxially connected to the rotating shaft (not shown) of the electric motor 3 and supplies the seawater W sucked from the suction port 2a to the water introduction path 15 of the fine bubble generator 4 via the water discharge part 8. To do.

 [0040] The microbubble generator 4 is generally cylindrical in shape, and in the lower part thereof, air in the atmosphere fed from a gas pump 73 disposed on a ridge 71 (see Fig. 1) is introduced. The front end of the air supply pipe 9 is connected, and the base end of the air supply pipe 9 is connected to the gas pump 73. A check valve 13 is provided in the middle of the supply pipe 9 to prevent the seawater W from flowing backward in the sea direction.

 [0041] As shown in FIGS. 5 to 7, the fine bubble generator 4 includes a cylindrical casing 4a containing a fluid swirl chamber 14 in which a fluid (seawater and air) can swivel around an axis S, and a fluid swirl. Introducing seawater W into chamber 14 to generate fluid swirl flow R, water introduction path 15 for jetting seawater W into fluid swirl chamber 14 and fluid swirl to introduce air into fluid swirl chamber 14 An air introduction path 16 formed in communication with the chamber 14 and a discharge path 17 formed at the end of the fluid swirl chamber 14 in the axial center S direction are provided. The discharge path 17 is formed in the central part (intersection with the axis S) of the planar partition wall 17a that intersects the axis S of the cylindrical casing 4a.

[0042] The water introduction path 15 has a cylindrical shape whose outer diameter is smaller than that of the cylindrical casing 4a, and a base 15 is provided with a connection part 15c to the water discharge part 8 of the liquid pump 2, and its tip part is a fluid swirl. The end of the chamber 14 opposite to the discharge path 17 is disposed so as to protrude into the fluid swirl chamber 14, and the tip thereof is closed by a closing plate 15a. As shown in FIG. 9, on the outer periphery of the water introduction path 15 located in the fluid swirl chamber 14, a plurality of seawater W are ejected along the direction that forms the position of the axis S of the fluid swirl chamber 14 and the torsion. There is an outlet 15b. In the present embodiment, six jet outlets 15b are arranged at equiangular intervals around the axis S, and these six jets 15b are arranged in two stages in the axis S direction with the same phase. Although a total of twelve are provided, the number and arrangement of these are not limited. [0043] As shown in FIG. 6, the air introduction path 16 penetrates the side surface portion of the water introduction path 15 and enters the inside thereof, bends at right angles to the axis S direction, and then has its tip opening 16a. Is open on the surface side of the closing plate 15a (fluid swirl chamber 14 side). The base end portion of the air supply pipe 9 is detachably connected to the air introduction path 16 protruding from the side surface of the water introduction path 15. Therefore, the air sent from the air supply pipe 9 is directly supplied into the fluid swirl chamber 14 via the air introduction path 16 from the tip opening 16a opened on the surface of the blocking plate 15a.

 As shown in FIG. 6 and FIG. 7, a plane intersecting the axis S is located outside the discharge path 17 of the cylindrical casing 4 a containing the fluid swirl chamber 14 at a position facing the discharge path 17. A disc-shaped guide member 18 having 18 a is arranged. The guide member 18 is joined to the tip portion of the cylindrical casing 4a via three arc-shaped connecting members 18b and 18c, and three outlets 19 force formed between the connecting members 18b and 18c. Therefore, seawater W mixed with fine bubbles NB, which will be described later, can be blown out into the sea. Note that these three air outlets 19 are arranged at intervals of 90 degrees in three directions other than the arrangement direction of the electric motor 3 in a plan view.

 [0045] As shown in FIG. 1, the fine bubble generating part 1 is put into the seawater W in the sacrifice 50, held in the standing condition in the seawater W, and a switch (not shown) of the switchboard 75 is operated. When the electric motor 3 is operated, the seawater W sucked from the suction port 2a of the liquid pump 2 flows into the water introduction path 15 from the water discharge part 8, and is jetted into the fluid swirl chamber 14 via the jet port 15b. At this time, the discharge direction of the seawater W is a direction that forms a twisted position with the axis S of the fluid swirl chamber 14, so that a seawater flow swirling around the axis S is generated in the fluid swirl chamber 14. Part of this seawater flow is discharged from the discharge path 17 into the seawater W.

At this time, as shown in FIG. 6, a negative pressure cavity V is generated in the vicinity of the axis S in the fluid swirl chamber 14, and the presence of this negative pressure cavity V causes the fluid swirl chamber 14 to be in the fluid swirl chamber 14. Due to the negative pressure, air in the atmosphere is smoothly introduced through the air introduction path 16 and the air supply pipe 9 communicating with the fluid rotation chamber 14, and the fluid swirl chamber 14 passes through the opening 16 a of the air introduction path 16. Flows in. Thus, in the fluid swirl chamber 14, a swirling flow (for example, also called swirling two-layer flow) consisting of a negative pressure cavity V located near the axis S and sea-water mixed with air that rotates around it. Is formed. [0047] In a state where such a swirl flow is formed in the fluid swirl chamber 14, the air introduced into the fluid swirl chamber 14 via the tip opening 16a of the air introduction path 16 is the swirl described above. It is refined by the shearing action of the flow and turns into a fluid swirl flow R, which swirls in the fluid swirl chamber 14 at high speed. The fluid swirl flow R eventually moves in the direction of the partition wall 17a of the fluid swirl chamber 14, and converges toward the discharge path 17 by coming into contact with the partition wall 17a, and passes through the discharge path 17 narrower than the inner diameter of the fluid swirl chamber 14. By passing through, it becomes seawater mixed with fine bubbles NB turning at higher speed, and then discharged into seawater W in the ginger 50. That is, the air sucked from the atmosphere and fed through the air supply pipe 9 can be changed into the fine bubbles NB in the fluid swirl chamber 14 and supplied into the seawater W.

 Therefore, as shown in FIG. 1, the seawater W and air in the atmosphere are supplied to the microbubble generator 1 and mixed with the microbubbles NB generated by the fluid swirl flow R formed in the fluid swirl chamber 14. Seawater W can be supplied to the seawater area above the distribution area (on the bottom 54 a) of Itogokai 55. These fine bubbles NB are extremely fine and contain a large amount of fine bubbles NB at the outer diameter nanometer level, so the ascent rate in seawater W is extremely low. For this reason, a phenomenon in which most of the residence time in the seawater W simply settles down toward the bottom 54a with the passage of time occurs. In addition, since fine bubbles NB with an outer diameter of nanometer level are supplied into seawater W, oxygen dissolution into seawater W is promoted, so oxygen dissolves to the saturation concentration level and has a specific gravity higher than that of surrounding seawater. There is also a phenomenon in which seawater W increased in number and descends toward the bottom 54a, and it is considered that the cancellation of the anoxic region in the bottom layer is progressing.

 [0049] Therefore, even if the fine bubble generating part 1 is arranged at a position away from the bottom 54a, the dissolved oxygen in the bottom seawater reaches a saturated state, and oxygen is efficiently supplied into the organic sludge 54b in the bottom 54a. Will come to be. For this reason, sufficient oxygen is supplied to the cypress 55 distributed on the bottom 54a, the vital activity and proliferation ability of the cypress 55 are activated, and the number of individuals increases significantly. (Not shown) also grows. Therefore, the organic sludge 54b at the bottom 54a can be efficiently decomposed and purified by the decomposition ability of the organic-degrading bacteria grown.

[0050] The outer diameter nanometer level formed by the fluid swirl flow R generated in the fluid swirl chamber 14 Bell's microbubbles NB force Seawater In W, there are many unclear points about the reason for the nature of sedimentation over time, but there are few microbubbles NB that rise due to the buoyancy of the bubbles themselves. It is presumed that this is due to movement and dispersion to the surface layer or bottom layer with the seawater vertical mixed flow. In addition, since it has been confirmed that ultrasonic waves are generated in and near the fluid swirling chamber 14 where the fluid swirl flow R is generated, the fine bubbles NB descend due to the action of the radiation pressure of the ultrasonic waves. Then I guess

[0051] Also, in the case of conventional fine bubbles formed by blowing air into seawater, the internal pressure is greater than atmospheric pressure, so most of them that are difficult to break up in seawater rise to the sea level and disappear. On the other hand, the fine bubbles NB supplied from the fine bubble generator 4 are formed in a negative pressure atmosphere by the fluid swirl flow R generated in the fluid swirl chamber 14, so that the internal pressure is less than the atmospheric pressure. It tends to disappear. For this reason, it is also predicted that oxygen in the air contained in the lost fine bubbles NB is dissolved in the seawater W and contributes to an increase in the amount of dissolved oxygen. Further, it is considered that the radiation pressure of ultrasonic waves generated when these fine bubbles NB disappear in the seawater W is also effective in lowering the fine bubbles NB.

 [0052] On the other hand, at the point where Itokai 55 grew at a high density in the bottom 54a, the decomposition of organic substances and the oxidation of anaerobic acid-volatile sulfides were promoted on the bottom surface layer. Was also confirmed. Therefore, in the fish farm 80, it is possible to reliably clean the organic sludge in the bottom portions 54 and 54 a by distributing the coral culture colony and supplying the fine bubbles NB into the seawater W. In the sea area where Itokai 55 was grown, the ammonia concentration in seawater W decreased rapidly, and an increase in nitrate and nitrite concentrations was observed. This phenomenon is caused by the biological activity and metabolic activity of Itokaikai 55. It is speculated that this indicates that the activity of microorganisms (nitrifying bacteria) having the function of changing nitrogen compounds such as ammonia into nitrate ions has increased.

[0053] Further, most of the fine bubbles NB supplied into the ginger 50 continue to stay in the seawater W for a long time and gradually disappear in the seawater W. As a result, the amount of dissolved oxygen in the seawater W is reduced. As a result, the anoxic region disappears and the purification action by aerobic microorganisms is activated, and the purification of the seawater W can also be achieved. Furthermore, the fine bubble generator 1 is activated, By supplying seawater mixed with microbubbles NB into the seawater W in the sacrifice 50, oxygen can be efficiently dissolved from the surface layer of this sea area to the bottom layer near the bottom 54a. As a result of the 53 vital activities being activated and the growth state being promoted, the body length and weight increased by about 10% in the same breeding period as compared with the conventional method.

 [0054] Here, an experiment was conducted on the difference in the growth state when the same age pods were cultured under the same conditions in the sacrifice pod 50 in this embodiment and the conventional pod (not shown). The results will be described. As explained with reference to Fig. 1, in the ginger 50, at the depth of 7m in the center of the ginger 50, fine bubbles with the capacity to supply 5 liters of minute bubbles NB mixed seawater into the seawater W per minute. Generator 1 is located. In this kind of sacrifice 50 and a conventional sacrifice (not shown) of the same scale, about 9000 individual 2-year-old fish cages are accommodated and the feeding conditions are almost the same. 1 was operated for a certain period of time every day, and changes in the weight of the pupae when bred for about three and a half months were examined. The operating time of the microbubble generator 1 in the sacrifice 50 was about 15 hours every day (between 5 PM and 8 AM the next morning). In addition, Itogokai 55 is distributed on the bottom 54 a of the sacrifice 50.

 [0055] At the start of the experiment, the average individual weight of the salmon in the salmon 50 was 1643.2 g, and the average individual weight of the salmon in the conventional salmon was 1612. lg, which can be regarded as almost the same weight. . Thereafter, while the feeding conditions were substantially the same, the sacrificed fish 50 was reared for about three and a half months while operating the microbubble generator 1 under the conditions described above. Then, after measuring the weight of the cocoons in each sacrifice after about three and a half months, the average individual weight of the cocoons in the conventional sacrifice was 2066.6 g, whereas the average number of cocoons in the sacrifice 50 The weight was 22 84. lg. From these results, it can be seen that the pups bred with 50 ginger have a weight of about 220 g more than those bred with conventional ginger. That is, it can be seen that the pups bred with the ginger 50 are greatly promoted in growth than the pupas bred with the conventional ginger.

[0056] In the present embodiment, the case where the culm 53 is cultivated is described. However, the field of application of the present invention is not limited to this, and therefore, hamachi, puffer fish, prawns, scallops, sea bream, etc. It can also be widely used in fish farms such as bi, oysters, and pearl shells, or seaweed farms such as seaweed, kombu, and kajime.

 [0057] Itogokai 55 and its symbiotic bacteria have been living in nature since ancient times, and the microbubble generator 1 supplies seawater W mixed with microbubbles NB to the sea for the purpose of providing sufficient oxygen to Itogokai 55. Therefore, it does not adversely affect the natural environment and fish shellfish in the surrounding sea area. Also, it is possible to distribute the sea bream 55 on the seabed and supply seawater W mixed with microbubbles NB to the sea area using the microbubble generator 1 located in a relatively shallow sea area, so no complicated equipment is required. .

 [0058] In the present embodiment, the fine bubble generating unit 1 is thrown into the sea to operate the electric motor 3, and only air is supplied from the gas pump 73 disposed on the sea to the fine bubble generator 4. Fluid swirl flow R is formed in fluid swirl chamber 14, and microbubbles generated by this can be supplied into the sea with seawater W mixed with NB, making it easy to clean the sea area where fish farm 80 is located. Can be jealous. The micro-bubble generator 1 has a structure in which the micro-bubble generator 4, liquid pump 2, and motor 3 are integrated, so that the piping for introducing seawater W can be minimized and the equipment is simple And miniaturization can be achieved. Further, since the fine bubble generator 1 is miniaturized by integrating the fine bubble generator 4, the liquid pump 2 and the electric motor 3, the occupied space can be small. For this reason, it is cultivated in the cage 50, and its influence on the sea current around the sea urchin 53 and fish farm 80 is extremely small. In addition, if the microbubble generator 1 is operated continuously, the dissolved oxygen content in the seawater W in the ginger 50 and its surrounding seawater W can be maintained at a saturated concentration level. Even if it is operated only from the evening when the amount of oxygen decreases to the next morning, a sufficient oxygen supply effect can be obtained.

[0059] In the fish farm 80, from autumn to winter when the seafloor environment recovers, a large number of cultivated scallop cultured colonies are distributed on the bottom 54a where the organic sludge 54b is deposited, and the microbubble generation part By using 1 and supplying fine air bubbles NB into seawater W, a high-density population that cannot occur in a natural phenomenon is generated in a short period of time, so that the organic sludge 54b deposited on the bottom 54a can be efficiently removed. It can be purified. It is also possible to eliminate the generation of anoxic water near the bottom 54 and 54a of the fish farm 80 where organic sludge 54b is deposited. Therefore, it is possible to prevent a decrease in the activity and poor growth of cultured fish (鯛 53) due to a decrease in oxygen.

 [0060] When the fine bubble NB is supplied from the fine bubble generation part 1 into the seawater W in the sacrifice 50, the fine bubble NB extends not only in the horizontal direction but also in the vertical direction, from the surface layer to the bottom layer (water depth of about 14m). , I was able to confirm the increase of dissolved oxygen amount of about 1 ~ 2mgZL. In addition, with respect to a single sacrifice 50, it was also found that if one fine bubble generating part was placed, the amount of dissolved oxygen could be increased efficiently from the surface layer to the bottom layer near the seabed.

 [0061] The fine bubble generating unit 1 of the present embodiment includes the liquid pump 2, the electric motor 3, and the fine bubble generator 4, and can be freely moved as it is. It is very easy to use because the microbubbles NB mixed seawater W can be supplied by simply operating the motor 3 with the entire microbubble generator 1 immersed in the seawater W. In addition, as long as the generator placed on the ocean ridge is operating, it can be continuously operated by the electric motor 3, so that a large amount of fine bubbles NB can be stably supplied into the seawater W.

 [0062] In the fine bubble generating part 1, since the jet outlet 15b of the water introduction path 15 is provided at a position away from the inner peripheral surface 14a of the fluid swirl chamber 14, a negative pressure cavity is formed by the water jetted from the jet outlet 15b. No water pressure is applied to part V. Therefore, the negative pressure cavity V is formed almost linearly on the axis S of the fluid swirl chamber 14, and the position and shape thereof are kept stable, thereby preventing the occurrence of cavity erosion. Therefore, the fine bubble generator 4 exhibits excellent durability.

 [0063] Further, since the tip opening 16a of the air introduction path 16 is disposed on the axis S of the fluid swirl chamber 14, the fluid swirl flow R in the fluid swirl chamber 14 generates near the axis S. Negative pressure Using the large negative pressure generated in the cavity V, air in the atmosphere can be efficiently introduced into the fluid swirl chamber 14 to form the fine bubbles NB.

[0064] On the other hand, since the guide member 18 having the flat surface 18a intersecting the axis S direction is disposed at a position facing the discharge path 17 established in the partition wall 17a, the discharge is performed while turning from the discharge path 17 The seawater mixed with the fine bubbles NB is expanded to the periphery along the plane 18a of the guiding member 18. After being guided in this way, it is discharged from the three outlets 19 in three different directions. The diffusibility of the fine bubbles NB is also good.

 [0065] This also increases the negative pressure level in the fluid swirl chamber 14, and a large amount of air is introduced into the fluid swirl chamber 14, so that the amount of fine bubbles NB generated is also increased. Further, the induction member 18 is caused by the negative pressure of the negative pressure cavity V generated in the fluid swirl chamber 14 and the seawater W in the vicinity of the discharge path 17 outside the fine bubble generator 4 is attracted to the discharge path 17. Therefore, the reverse flow of seawater W into the fluid swirl chamber 14 can be prevented.

 [0066] This embodiment is an example implemented in a fish farm 80 provided in a bay, which is one of the natural closed water areas. It can also inhabit estuaries and inner bays (i.e. so-called brackish waters) where the brackish water formed constantly or seasonally exists. For this reason, the fish and shellfish culture method of the present invention can be carried out even in such a brackish water area, and even in such a case, the excellent operational effects as described above can be obtained.

 Here, with reference to FIG. 10, another embodiment relating to the fine bubble generator 4 will be described. In the fine bubble generator 4X shown in FIG. 10, a discharge port 36 is opened in the tangential direction of the inner peripheral surface 14a of the fluid swirl chamber 14, and a discharge pipe 35 having an on-off valve 35a is connected to the discharge port 36. . During normal operation, the on-off valve 35a is closed. If foreign matter enters the fluid swirl chamber 14, the on-off valve 35a can be opened and discharged. As long as the discharge port 36 faces the tangential direction of the inner peripheral surface 14a of the fluid swirl chamber 14, the position of the discharge port 36 may be anywhere in the cylindrical casing 4a, but the inner diameter of the fluid swirl chamber 14 is If it is not constant, it is desirable to provide it at the maximum inner diameter. The structure and functions of the other parts are the same as the microbubble generator 4.

 Next, with reference to FIGS. 11 to 14, other embodiments relating to the fine bubble generator will be described. FIG. 11 is a diagram showing a second embodiment of the microbubble generator, FIG. 12 is a perspective view of the microbubble generator shown in FIG. 11, FIG. 13 is a cross-sectional view taken along the line EE in FIG. 12, and FIG. It is a schematic diagram which shows the operating state of the fine bubble generator shown in FIG.

As shown in FIGS. 11 to 14, the fine bubble generator 20 includes a cylindrical fluid swirl chamber 22 in which a fluid (seawater and air) can swirl in a substantially rectangular parallelepiped casing 21, The inner circumferential surface 22a of the central portion of the body swirl chamber 22 in the S direction is air-aired in the normal direction. One air introduction path 24 for introduction is established, and two waters that can introduce seawater in the tangential direction of the inner peripheral surface 22a of the fluid swirl chamber 22 are located near both ends sandwiching the air introduction path 24. Introduction route 23 has been established.

[0070] Each of the water introduction path 23 and the air introduction path 24 is formed so as to penetrate the casing 21, and the water introduction pipe 23a and the air introduction pipe 24a are connected to respective opening portions of the outer surface of the casing 21. The two water introduction pipes 23a are connected to the water supply pipe 23b in a unified state on the upstream side, and the air introduction pipe 24a is extended in the direction of the water supply pipe 23b as it is.

 [0071] In addition, at both ends of the fluid swirl chamber 22 in the direction of the axis S, planar partition walls 21a orthogonal to the axis S are provided, and central portions of these partition walls 21a (intersections with the axis S) ) Each have a circular discharge path 25, and a guide pipe 26 is connected to each of the two discharge paths 25. As will be described later, the guide pipe 26 is communicated so as to protrude linearly along the discharge direction of seawater mixed with fine bubbles NB discharged from the discharge path 25, and the discharge direction is regulated by the guide pipe 26. is doing.

 [0072] As in FIG. 1, the fine bubble generator 20 is immersed in the seawater W in the fish bowl 50, and from the liquid pump (not shown) placed on the bowl 71, through the water supply pipe 23b and the water introduction pipe 23a. Then, sea water is pumped and sea water is pumped from the water introduction path 23 into the fluid swirl chamber 22, and fluid swirl from the air introduction path 24 via the air introduction pipe 24a from the gas pump 73 (see Fig. 1). When air flows into the chamber 22, a fluid swirl flow R around the axis S is generated in the fluid swirl chamber 22, and a negative pressure cavity V is formed in the vicinity of the axis S.

 [0073] The air flowing into the fluid swirl chamber 22 from the air introduction path 24 is shattered by the shearing action of the fluid swirl flow R, and turns into fine bubbles NB while rotating around the negative pressure cavity V. Eventually, it will be discharged from the discharge path 25 as seawater mixed with fine bubbles NB. The seawater mixed with fine bubbles NB discharged from the discharge path 25 is discharged into the seawater W in the ginger 50 while being guided by the guide pipe 26. As a result, the amount of dissolved oxygen in the seawater W increases, and the same effect as when the fine bubble generating unit 1 is used can be obtained.

[0074] Further, by pumping air with the gas pump 73, it is possible to generate, together with the fine bubbles NB, bubbles having an outer diameter larger than that of the fine bubbles NB (the outer diameter is estimated to be about several millimeters). Therefore, the action of stirring the seawater w by these bubbles can also be obtained. If an oxygen enricher (not shown) with an oxygen enriched membrane is installed in the middle of the air feed path and air with an increased oxygen concentration is sent into the fluid swirl chamber 22 of the fine bubble generator 20, Since the fine bubbles NB with high oxygen concentration can be supplied into the seawater W, the dissolved oxygen concentration in the seawater W can be greatly increased.

 Furthermore, in this embodiment, since the guide pipe 26 is provided in the discharge path 25 of the fine bubble generator 20, the seawater mixed with the fine bubbles NB discharged from the discharge path 25 interferes with the surrounding seawater W. Without being done, it is discharged in a certain direction immediately. Accordingly, the surrounding seawater W is not attracted into the discharge path 25, and the seawater W does not flow back into the fluid swirl chamber 22, and the negative pressure level generated in the fluid swirl chamber 22 is prevented. The amount of microbubbles NB can be stably supplied. Also, the seawater mixed with fine bubbles NB passes through the induction pipe 26 and is released into the seawater W, so that the flow direction is converged and the straightness is improved. It is possible to supply NB, and also exerts a stirring action on the surrounding seawater W. Since the fine bubble generator 20 is a method of supplying seawater from a liquid pump or the like disposed on the ridge, the portion that is introduced into the sea can be made smaller than the fine bubble generator 1. For this reason, when used in a fish farm, the effects on the fish shellfish being cultivated and the nearby ocean current can be further reduced.

Here, with reference to FIG. 15, another embodiment relating to the fine bubble generator 20 will be described. In the fine bubble generator 20X shown in FIG. 10, a discharge port 38 is opened in the tangential direction of the inner peripheral surface 22a of the fluid swirl chamber 22, and a discharge pipe 37 having an on-off valve 37a is connected to the discharge port 38. . As with the microbubble generator 4X shown in Fig. 10, the opening and closing valve 37a is closed during normal operation.If foreign matter enters the fluid swirling chamber 22, the on-off valve 37a is opened and discharged. can do. As long as the discharge port 38 faces the tangential direction of the inner peripheral surface 22a of the fluid swirl chamber 22, the position of the discharge port 38 may be any position on the casing 21, but the position facing the water introduction path 23. If it is established in the country, foreign substances etc. can be quickly discharged by the water flowing in from the water introduction path 23. Further, when the inner diameter of the fluid swirl chamber 22 is not constant, it is desirable to provide it at the maximum inner diameter portion. The seawater W is supplied from the outside into the fluid swirl chamber 22 via the discharge pipe 37 with the open / close valve 37a opened. In this case, a gas-liquid swirl flow swirling in a direction opposite to the fluid swirl flow R can be generated in the fluid swirl chamber 22. The structure and functions of other parts are the same as for the fine bubble generator 20.

 Next, with reference to FIGS. 16 to 18, other embodiments relating to the fine bubble generator will be described. FIG. 16 is a perspective view showing a third embodiment relating to the fine bubble generator, FIG. 17 is a cross-sectional view taken along the line FF in FIG. 16, and FIG. 18 is a schematic view showing an operating state of the fine bubble generator shown in FIG. is there. In the fine bubble generator shown in FIG. 16 to FIG. 18, parts having the same structure and function as those of the fine bubble generator 20 described above are given the same reference numerals as those shown in FIG. 11 to FIG. Omitted.

 As shown in FIGS. 16 to 18, the fine bubble generator 30 has a structure in which the air introduction path 24 and the air introduction pipe 24a in the fine bubble generator 20 described above are eliminated, and the other is fine bubble generation. Same as vessel 20. In the fine bubble generator 30, a mixed fluid of seawater and air is supplied via the fluid supply pipe 33b and the fluid introduction pipe 33a, and this mixed fluid is tangential to the inner peripheral surface of the fluid swirl chamber 32. The microbubbles generated by introducing the fluid into the fluid swirl chamber 32 from the fluid introduction path 33 arranged at the high speed and swirling at high speed are supplied to the seawater in the ginger 50 through the discharge path 25 and the guide pipe 26. To do.

 [0079] In the case of the fine bubble generator 30, the mixed fluid of seawater and air is fed into the fluid swirl chamber 32 through the single fluid feed pipe 33b, and the seawater mixed with fine bubbles NB. Therefore, there is no need for long air supply pipes, etc., piping and handling are easy, and there is no risk of clogging of the air supply pipe. In addition, the outer diameter of the generated fine bubbles NB can be increased or decreased by increasing or decreasing the air mixing rate in the mixed fluid of air and seawater that is supplied via the fluid supply pipe 33b. Other structures and functions are the same as the fine bubble generator 20.

[0080] In the above embodiment, the case where the fine bubble generators 4, 20, 30 and the like are arranged in the seawater W and fish shellfish are cultured while purifying the sea area has been described. However, the present invention is not limited to these embodiments, and can be implemented as a fish shell culture method in freshwater or brackish water. That is, the fine bubble generators 4, 20, 30 etc. are placed in fresh water or brackish water, and water and air are sent to the fine bubble generators 4, 20, 30. Supplying fine water NB-mixed fresh water into the fresh water area by the fluid swirl flow R formed in the fluid swirl chamber 14, 22, 32, and the bottom that inhabit the bottom of these water areas It can also supply oxygen to living organisms. As a result, it is possible to purify the water quality and bottom quality of freshwater bodies and brackish water areas, so that the breeding state of fish and shellfish bred in these water areas can be promoted.

Industrial applicability

 The fish shell culture method of the present invention can be used as a fish shell culture method in an artificial sea area such as a fish shell farm in a coastal water area, and also as a fish shell culture method in a natural sea area, a brackish water area, or a fresh water area. Can be widely used.

Claims

The scope of the claims

 [1] A fluid formed in the fluid swirl chamber by disposing the fine bubble generating means including the fluid swirl chamber in the water area to be purified and supplying water and air to the fine bubble generating means. Supplying water containing fine bubbles generated by swirling flow into the water area, and breeding fish and shellfish in the water area purified by supplying oxygen to benthic organisms that inhabit the bottom of the water area Fish shell culture method.

 [2] Disperse spiders at the bottom of the seawater area to be purified, and place fine bubble generating means with a built-in fluid swirl chamber in the seawater region on the dispersal area of the reeds. Seawater and air are supplied to the generating means to supply seawater mixed with fine bubbles generated by the fluid swirl formed in the fluid swirl chamber into the seawater area, and benthic organisms that inhabit the bottom of the water area And a method for culturing fish and shellfish, wherein the fish and shellfish are bred in the water area purified by supplying oxygen to the cynomolgus shellfish.

 [3] As the fine bubble generating means,

 A cylindrical or rotating fluid swirl chamber in which fluid can swivel around an axis, and water is fed into the fluid swirl chamber along a direction that forms a twisted position with respect to the shaft center. A fluid introduction path, an air introduction path provided in communication with the fluid swirl chamber for supplying air into the fluid swirl chamber, and the fluid swirl chamber force for discharging water mixed with fine bubbles. A fine bubble generator having a discharge path provided on an extension line of the shaft center;

 A fine bubble generator comprising: a liquid pump that supplies water into the fluid swirl chamber via the water introduction path; and a gas pump that supplies air into the fluid swirl chamber via the air introduction path. The method for culturing fish and shellfish according to claim 1 or 2.

[4] As the fine bubble generating means,

A cylindrical or rotating fluid swirl chamber in which a fluid can swivel around an axis, and air-mixed water is fed into the fluid swirl chamber along a direction that forms a twisted position with respect to the shaft center. A microbubble generator comprising: an air / water introduction path arranged as described above; and a discharge path arranged on an extension line of the shaft for discharging water mixed with microbubbles from the fluid swirl chamber; A fine bubble generation comprising: a liquid pump for supplying water into the fluid swirl chamber via the air / water introduction path; and a gas pump for supplying air into the fluid swirl chamber via the air / water introduction path. The fish shellfish cultivation method according to claim 1 or 2, wherein the apparatus is used. As the fine bubble generating means,

 A cylindrical or rotating fluid swirl chamber in which fluid can swivel around an axis, and water is fed into the fluid swirl chamber along a direction that forms a twisted position with respect to the shaft center. A water introduction path, an air introduction path provided in communication with the fluid swirl chamber for supplying air to the fluid swirl chamber, and the shaft for discharging the fluid swirl chamber force water mixed with fine bubbles. A microbubble generator having a discharge path provided on an extension of the heart;

 A waterproof liquid pump for feeding water sucked from a suction port provided in a portion that can be immersed in water into the fluid swirl chamber via the water introduction path;

 A fine bubble generator integrated with a waterproof drive for operating the liquid pump;

 A gas pump for feeding air into the fluid swirl chamber via the air introduction path of the fine bubble generating unit;

 The method for culturing fish and shellfish according to claim 1 or 2, wherein a micro-bubble generating device comprising: