JP2006314281A - Method for culturing fish and shellfish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for culturing fishes and shellfishes, without requiring complex facilities, without giving a bad effect to natural environment, or deteriorating bottom quality or water quality, capable of accelerating the growth of the fishes and shellfishes and aiming at the effective utilization of a culturing place. <P>SOLUTION: This fish-culturing place 80 is equipped with a crawl 50 constituted by a raft 51 floated on a prescribed ocean space, a net 52, etc., installed in the sea beneath and a controlling system 70 installed on a raft 71 arranged as adjacent with the crawl 50. In the net 52 of the crawl 50, many sea breams 53 are cultured, a fine bubble-generating part 1 is arranged in the sea of the crawl 50, and at the bottom part 54a of the ocean space where the crawl 50 is installed, a large amount of Capitella sp.1 55 is scattered. By supplying an electricity and air to the fine bubble-generating part 1 from a generator 72 and an air pump 73 on the raft 71, sea water mixed with the generated fine bubbles NB is supplied to the sea water W in the crawl 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for culturing fish and shellfish that can be carried out in various water areas such as sea areas such as coastal areas of oceans and fresh water areas such as rivers and lakes.

  In the coastal waters of various parts of Japan, aquaculture and fisheries have been operated to grow and ship fish and shellfish such as Thailand and Hamachi. In these fish farms, a large amount of food residue distributed on the sea surface and excrement of fish shellfish being raised are generated, and a large amount of organic matter is accumulated at the bottom of the sea area. A large amount of organic matter deposited on the sea floor generates harmful hydrogen sulfide through anaerobic decomposition during the summer high water temperature period, so the bottom of the sea is contaminated with a large amount of organic sludge that cannot be inhabited by organisms. It has a serious adverse effect on the growth of fish and shellfish in the farm. Especially in places where fish farming is carried out in topographically closed inner bays, feeding fish farmed fish has a strong impact on water quality and sediment quality by adding dissolved substances to the water and loading organic matter on the seabed. Is exerting. Also in fresh water areas such as rivers and lakes, or in estuaries and inner bays (so-called brackish water areas) where brackish water formed by mixing fresh water and sea water flowing in from rivers etc. is present constantly or seasonally. Deterioration of water quality due to domestic wastewater and industrial wastewater, or deterioration of bottom quality and water quality due to accumulation of organic sludge has occurred.

  By the way, in the fish farm, in the autumn when the seawater temperature falls, convection occurs in the nearby sea area, and oxygen is supplied to the organic sludge on the seabed, so these organic sludge is used as a nutrient source. The activity of bentos (benthic organisms) is activated, and organic sludge is purified by the life activity. Therefore, the inventor of the present application has proposed a technique for efficiently cultivating a large amount of benths by spreading them on the organic sludge on the seabed and efficiently purifying the organic sludge using the organic matter consumption power of these bentos. (For example, refer to Patent Document 1).

  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 to increase oxygen into the organic sludge. Those which are intended to supply (for example, refer to Patent Documents 2 and 3), or those which stir the bottom organic matter sludge, cultivate and supply oxygen by injecting fine bubble mixed water into the organic matter sludge deposited on the bottom ( For example, see Patent Document 4.).

JP 2001-231394 A JP-A-8-281292 JP 2004-290893 A JP 2003-265063 A

  In the case of the organic sludge purification technology described in Patent Document 1, since the activity of benthic organisms is activated when the seawater temperature of the fish farm is low, an excellent purification effect can be obtained. Since the benthic organisms decrease during the period when the amount of water increases, the purification action decreases. For this reason, not only does the growth of fish and shellfish worsen, but the use of the farm must be suspended until the purification action is restored.

  Further, in the case of the sludge purification technology described in Patent Documents 2 and 3, since the particle size of the fine bubbles supplied to the sea by the used fine bubble generating means is relatively large, it rises as soon as it is supplied to the sea. Most of them rise to the sea level and disappear. For this reason, the residence time of bubbles in seawater is relatively short, so that oxygen cannot be sufficiently dissolved in seawater, and the oxygen supply action into organic sludge is insufficient. In particular, in seawater that receives buoyancy greater than that of fresh water, the rate of bubbles rises faster, so that a sufficient oxygen supply effect cannot be obtained.

  In order to increase the amount of oxygen supplied into 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 must be disposed directly above the bottom. For this reason, piping and wiring from water supply means and air supply means placed on the surface of the sea or on the sea (above ground) become long. As a result, structures that support these wiring and piping are also required, increasing the size and complexity of the equipment. Has been invited.

  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 peripheral sea area is formed by the sludge wound up with the fine bubble mixed water sprayed from the spray nozzle. Because the seawater in the sea is polluted, it cannot be used in farms that keep fish and shellfish that are susceptible to adverse effects on growth due to the contaminated seawater.

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

  The fish shell culture method of the present invention is formed in the fluid swirl chamber by disposing fine bubble generating means having a fluid swirl chamber in a water area to be purified and supplying water and air to the fine bubble generating means. Breeding fish and shellfish in the water area that is 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 swirling flow into the water area It is characterized by.

  With this 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 toward the bottom of the water area, thereby supplying oxygen to the water and the bottom layer. In addition, since the anoxic region is eliminated, oxygen is also supplied to benthic organisms that inhabit the bottom. As a result, the life activity of benthic organisms is remarkably activated and the organic matter decomposing ability is enhanced, so that organic sludge at the bottom of the water area is efficiently purified, water quality is improved, and the amount of dissolved oxygen in the water is increased. Can do.

  Therefore, organic sludge caused by bait and fish and shellfish excrement distributed on the farm 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. It is possible to promote the growth of reared fish and shellfish. Moreover, in order to naturally purify organic sludge deposited on the bottom, it has been necessary to at least once during a season, and the suspension period of the farm is not necessary, and the farm can be used continuously. Effective use of the venue can be promoted, improving efficiency. In addition, since water containing fine bubbles may be supplied to the water area using the fine bubble generating means arranged in the water area to be purified, no complicated equipment is required, and the natural environment is not adversely affected.

  It should be noted that halophilic bacteria, EM bacteria, nitrifying bacteria, etc. are distributed on the bottom of the water area where the fish shellfish cultivation method is to be implemented, and water containing a mixture of fine bubbles is supplied to the water area by the means for generating fine bubbles. For example, the purification action is further improved. Here, EM bacteria is an abbreviation for Effective Micro-Organisms bacteria, and means a group of microorganisms effective for decomposing organic matter including lactic acid bacteria, yeasts, radioactive bacteria, filamentous fungi, photosynthetic bacteria, and the like.

  On the other hand, the present inventor used a large amount of benthos in advance, and actively uses the organic matter-consuming power of the beetle by spreading it on the organic sludge on the seabed in the autumn when living organisms can live. Thus, it has been found that organic sludge can be efficiently purified (see, for example, Patent Document 1). Benthos are known to be spiophyceae and small polychaetes. Among them, swordfish (Capitella sp. 1) appear in high density in organic polluted areas and explosive during the recovery period of sludge environmental conditions. It is known to proliferate. Accordingly, the present inventor has conducted extensive research on the ecology and the like of staghorns, and as a result has completed the present invention.

  It is a filamentous organism with a body length of about 10 mm and a maximum part diameter of about 1 mm. In the summer when the seafloor environment has become extremely anaerobic, the growth rate is extremely slow, but when the seafloor environment recovers from autumn to winter, the water temperature becomes 10-15 ° C, and the dissolved oxygen in the bottom water becomes saturated or close to that condition. It grows to an adult in 4-6 weeks and shows explosive proliferation ability by repeating breeding. In addition, in the process of growth, bacteria with organic matter resolution (hereinafter referred to as “organic matter-degrading bacteria”) that coexist with cynomolgus species also grow, and these organic matter-degrading bacteria use organic matter in organic matter sludge as a nutrient source. Sludge can be decomposed and removed by the life activity of organic matter-degrading bacteria.

  Therefore, the fish shellfish cultivation method of the present invention distributes scallops at the bottom of the seawater area to be purified, and disposes fine bubble generating means incorporating a fluid swirl chamber in the seawater area above the scorpionate area. And supplying seawater and air to the microbubble generating means to supply seawater mixed with microbubbles generated by a fluid swirl flow formed in the fluid swirl chamber into the seawater area and inhabit the bottom of the water area. It is characterized in that fish shellfish are bred in water that is purified by supplying oxygen to benthic organisms and cynomolgus species.

  With such a configuration, the seawater mixed with microbubbles generated by the fluid swirl flow formed in the fluid swirl chamber by supplying the seawater on the distribution area of coral and the air in the atmosphere to the microbubble generating means. Can be supplied 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, not only the residence time in seawater is long, but also the bottom of the sea over time. Also shows the property of sinking towards For this reason, it becomes possible to raise the amount of dissolved oxygen in seawater near the bottom, and the poor oxygen layer can be eliminated.

  Therefore, even if the means for generating fine bubbles is not located 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 and inhabit the bottom. Sufficient oxygen is supplied to benthic organisms and the distributed spider worms. 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 coexist with the carpenter are also proliferated. For this reason, the organic matter sludge on the seabed can be efficiently decomposed and purified by the decomposition ability of the grown organic matter-degrading bacteria.

  In addition, most of the fine bubbles supplied in the sea will gradually disappear in the seawater while staying in the seawater for a long time, so the amount of dissolved oxygen in the seawater will increase, and the oxygen-poor region will disappear. Therefore, the purification action by aerobic microorganisms is also activated, and the seawater area can also be cleaned by this. Therefore, if fish and shellfish are cultivated in the sea area thus purified, the life activity of the fish and shellfish is activated and its growth state can be greatly promoted.

  In the present invention, the cypress and its symbiotic bacteria distributed on the sea floor are organisms that have been living in the natural world since ancient times, and the microbubble generating means is a microscopic product formed from air in the atmosphere for the purpose of providing sufficient oxygen to the cypress. Since it supplies seawater mixed with bubbles into the sea, it does not adversely affect the natural environment or fish and shellfish. Further, it is only necessary to distribute sea breams on the seabed and supply seawater mixed with microbubbles to the sea area by using microbubble generating means arranged in a relatively shallow sea area, so that complicated facilities are not required.

Here, as the fine bubble generating means,
A cylindrical or rotating fluid swirl chamber in which fluid can swirl 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 shaft center for discharging water containing fine bubbles from the fluid swirl chamber. A fine bubble generator having a discharge path provided on an extension line of
A liquid pump for supplying water into the fluid swirl chamber via the water introduction path;
A gas pump for supplying air into the fluid swirl chamber via the air introduction path;
Can be used.

  With such a configuration, the fine bubble generator is put into water, and water and air are supplied to the fine bubble generator from a liquid pump and a gas pump arranged on the water or on the ground, respectively. Since mixed water can be supplied, it is not necessary to use a liquid pump or a 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 pump and gas pump, it is relatively easy to cope with a large-scale fish and shellfish farm.

As the fine bubble generating means,
A cylindrical or rotating fluid swirl chamber in which fluid can swivel around an axis, and air-mixed water is fed into the fluid swirl chamber along a direction that forms a twist position with the shaft center. A fine bubble generator comprising: an air / water introduction path disposed on the fluid center; and a discharge path disposed on an extension line of the axis for discharging water mixed with fine bubbles from the fluid swirl chamber;
A liquid pump for supplying water into the fluid swirl chamber via the air-water introduction path;
A gas pump for supplying air into the fluid swirl chamber via the air / water introduction path;
It is also possible to use a fine bubble generator equipped with

  With such a configuration, a fine bubble generator is put into the water, and water and air are respectively supplied from the liquid pump and the gas pump arranged on the water or on the ground to the air / water introduction path, so that one air / water is supplied. It is possible to supply water mixed with air to the fine bubble generator via the introduction path and supply water mixed with fine bubbles into the water. For this reason, the piping path from the liquid pump and the gas pump to the fine bubble generator can be unified, and the facilities can be simplified.

Furthermore, as the fine bubble generating means,
A cylindrical or rotating fluid swirl chamber in which fluid can swirl 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 into the fluid swirl chamber, and the shaft center for discharging water mixed with fine bubbles from the fluid swirl chamber. A fine bubble generator having a discharge path provided on an extension line of
A waterproof liquid pump that feeds 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 generating unit that integrates a waterproof drive for operating the liquid pump;
A gas pump that feeds air into the fluid swirl chamber via the air introduction path of the microbubble generator;
It is also possible to use a fine bubble generator equipped with

  With such a configuration, the microbubble generation unit is put into water and the drive unit is operated, and the fluid swirling is performed only by supplying air from a gas pump arranged on the water or on the ground to the microbubble generator. A fluid swirl flow is formed in the room, and water mixed with fine bubbles generated thereby can be supplied into the water, so that the fish shellfish cultivation method can be easily implemented. The micro-bubble generator has a structure in which the micro-bubble generator, liquid pump, and drive unit are integrated. Therefore, the piping that serves as the water introduction path can be minimized, and the equipment can be simplified and miniaturized. You can plan.

  According to the present invention, it is possible to promote the growth of fish and shellfish without adversely affecting the natural environment, deteriorating the bottom sediment and water quality, and effectively utilizing the farm. Will be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a fish and shellfish farm using the fish and shellfish cultivation method according to the embodiment of the present invention, and FIG. 2 is a partially enlarged view showing a management system in the fish and shellfish farm shown in FIG.

  As shown in FIG. 1, the fish farm 80 according to the present embodiment includes a cage 50 formed in a certain sea area and a cage 50 formed by a net 52 disposed under the sea, and the cage 50. And a management system 70 provided on the ridge 71 arranged adjacent to each other. A large number of carp 53, which are cultured fishes, are bred inside the net 52 of the ginger 50, and the fine bubble generating part 1 is arranged in the sea, and a large amount of cormorant is located at the bottom 54a of the sea area where the ginger 50 is provided. (Capitella sp. 1) 55 is distributed. Thereby, in the fish farm 80, the fine bubble generation part 1 is in the seawater W on the bottom part 54a, which is the distribution area of the carpenter moth 55.

  Itogokai 55 is a diver who dives into a plastic bag with about 800,000 to 1,600,000 individual cultivated colony together with sand as a culture substrate, and then breaks the vinyl bag near the bottom 54a. A cypress culture colony is gently spread on the bottom 54a together with sand as a culture substrate. According to the result of the water quality observation of the seawater W in the fish farm 80, the time when the organic sludge concentrates and accumulates on the bottom 54a occurs when the summer stratification collapses and vertical mixing occurs. Is known. Therefore, it is considered that the distribution of the cultivated colony at this time is the most effective timing for purifying the organic sludge 54b.

  The fine bubble generating unit 1 disposed in the sacrifice 50 is locked at a fixed position by the wire 1 a, operates with an alternating current supplied from the generator 72 constituting the management system 70, and is sucked from within the sacrifice 50. The seawater W mixed with the fine bubbles NB formed by the seawater W and the air fed from the gas pump 73 is discharged into the sacrifice 50. In the present 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 fine bubble generating unit 1 is disposed at a depth of 7 m from the sea surface W1, but this is limited to this. Instead, the position of the microbubble generator 1 can be changed by lowering or pulling up the wire 1a.

  As shown in FIG. 2, the management system 70 on the ridge 71 is a generator 72, a gas pump (air compressor) 73, a water quality measuring device 74 that automatically measures the amount of dissolved oxygen in the seawater W, and wireless transmission of measurement results. A distribution panel 75 for operating a solar battery panel 76, a generator 72, a gas pump 73 and the like for charging a storage battery (not shown) for operating the transmitter 77a and the antenna 77b, the water quality measuring device 74 and the transmitter 77a, etc. I have. 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, and has a plurality of preset water depths. The water quality of the seawater W at the position and the flow direction flow velocity of the tidal current can be automatically measured.

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

  By adopting such a configuration, it becomes possible to monitor the water quality structure and tidal current state of the fish farm 80 within 2 hours from the occurrence of the phenomenon, so that the dissolved oxygen content of the seawater W with the sacrifice 50 is reduced. The monitoring, the operation of the fine bubble generating unit 1 for preventing a decrease in the amount of dissolved oxygen, the verification of the effect accompanying the operation, or the monitoring of the generation of water quality structure that causes the accumulation of organic sludge can be performed. Thereby, the information essential for the management of the water quality environment of the fish farm 80 and the effective operation of the environmental improvement technology can be quickly obtained.

  Next, with reference to FIGS. 3 to 9, the structure and function of the fine bubble generating unit 1 will be described in detail. 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. FIG. 6 is a sectional view taken along line AA in FIG. 5, FIG. 7 is a sectional view taken along line BB in FIG. 5, and FIG. 8 is a sectional view taken along line CC in FIG. 9 is a cross-sectional view taken along line DD in FIG.

  As shown in FIGS. 3 and 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. The structure is integrally connected. The electric motor 3 is supplied with power from a generator 72 arranged on a marine 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 a rotating shaft (not shown) of the electric motor 3, and supplies the seawater W sucked from the suction port 2 a to the water introduction path 15 of the fine bubble generator 4 through the water discharge part 8. .

  The fine bubble generator 4 is substantially cylindrical in shape, and an air supply pipe for introducing air in the atmosphere fed from a gas pump 73 disposed on a ridge 71 (see FIG. 1) to the lower part thereof. 9 is connected, and the proximal 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 air supply pipe 9 to prevent the seawater W from flowing backward in the sea direction.

  As shown in FIGS. 5 to 7, the fine bubble generator 4 includes a cylindrical casing 4 a containing a fluid swirl chamber 14 in which a fluid (seawater and air) can swirl around an axis S, and the fluid swirl chamber 14. In order to introduce the seawater W to generate the fluid swirl flow R, the water introduction path 15 for ejecting the seawater W into the fluid swirl chamber 14 and the fluid swirl chamber 14 for introducing air into the fluid swirl chamber 14 are communicated. The air introduction path 16 formed in this way and the 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 center part (intersection part with the axis S) of the planar partition wall 17a orthogonal to the axis S of the cylindrical casing 4a.

  The water introduction path 15 has a cylindrical shape whose outer diameter is smaller than that of the cylindrical casing 4 a, and a base part of the water introduction path 15 is provided with a connection part 15 c with the water discharge part 8 of the liquid pump 2. At the end opposite to the discharge path 17, it is disposed so as to protrude into the fluid swirl chamber 14, and its tip is closed by a closing plate 15 a. As shown in FIG. 9, a plurality of seawaters W are ejected to the outer periphery of the water introduction path 15 located in the fluid swirl chamber 14 along a direction that forms a position of twist with the axis S of the fluid swirl chamber 14. No. 15b is provided. In the present embodiment, six jet outlets 15b are arranged at equiangular intervals around the axis S, and the six jet outlets 15b are arranged in two stages in the direction of the axis S in the same phase. Although a total of twelve are provided, the number and arrangement are not limited to these.

  As shown in FIG. 6, the air introduction path 16 penetrates through the side surface of the water introduction path 15 and enters the inside thereof, bends at right angles in the direction of the axis S, and then the opening 16 a of the front end opens at the blocking plate 15 a. Is opened on the surface side (the 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 FIGS. 6 and 7, a circle having a flat surface 18 a intersecting the axis S at a position facing the discharge path 17 outside the discharge path 17 of the cylindrical casing 4 a containing the fluid swirl chamber 14. A plate-shaped guide member 18 is disposed. The guide member 18 is joined to the tip end portion of the cylindrical casing 4a via three connecting members 18b and 18c having an arc shape, and from three outlets 19 formed between these connecting members 18b and 18c. The seawater W mixed with fine bubbles NB, which will be described later, can be blown out into the sea. Note that these three outlets 19 are arranged at intervals of 90 degrees in three directions excluding the arrangement direction of the electric motor 3 in a plan view.

  As shown in FIG. 1, the fine bubble generating unit 1 is put into the seawater W in the sacrifice 50, held in the standing state in the seawater W, and a switch (not shown) of the switchboard 75 is operated to operate the electric motor 3. Is activated, the seawater W sucked from the suction port 2a of the seawater pump 2 flows into the water introduction path 15 from the water discharger 8 and is ejected into the fluid swirl chamber 14 via the ejection port 15b. At this time, since the jet direction of the seawater W is a direction that forms a twisted position with the axis S of the fluid swirl chamber 14, a seawater flow swirling around the axis S is generated in the fluid swirl chamber 14. A 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 creates a negative pressure in the fluid swirl chamber 14. Therefore, air in the atmosphere is smoothly introduced via the air introduction path 16 communicating with the fluid swirl chamber 14 and the air supply pipe 9, and flows into the fluid swirl chamber 14 from the tip opening 16 a of the air introduction path 16. Thereby, in the fluid swirl chamber 14, a swirl flow (for example, also referred to as a swirling two-layer flow) composed of a negative pressure cavity V positioned in the vicinity of the shaft center S and air-mixed seawater that rotates around it. Is formed.

  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 shearing action of the swirl flow described above. And the fluid swirl flow R becomes a high-speed swirl in the fluid swirl chamber 14. The fluid swirl flow R eventually moves toward the partition wall 17 a of the fluid swirl chamber 14, converges toward the discharge path 17 by contacting the partition wall 17 a, and passes through the discharge path 17 narrower than the inner diameter of the fluid swirl chamber 14. By doing so, it becomes seawater mixed with fine bubbles NB rotating at a higher speed and then discharged into the seawater W in the sacrifice 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 mixed with the fine bubbles NB generated by the fluid swirl flow R formed in the fluid swirl chamber 14 by supplying the seawater W and air in the atmosphere to the fine bubble generator 1. , It can be supplied to the seawater area on the distribution area (on the bottom 54 a) of the lobster 55. Since these fine bubbles NB are extremely fine and contain a large amount of fine bubbles NB having an outer diameter of nanometer level, the ascending speed in the seawater W is extremely low. For this reason, not only the residence time in the seawater W is long, but also a phenomenon in which most of the sedimentation occurs toward the bottom 54a with the passage of time. Further, since the fine bubbles NB of the outer diameter nanometer level are supplied into the seawater W, the oxygen dissolution into the seawater W is promoted, so that the oxygen is dissolved to the saturation concentration level and has a specific gravity higher than that of the surrounding seawater. A phenomenon in which the increased seawater W descends toward the bottom 54a also occurs, and it is considered that the poor oxygen region in the bottom layer is being eliminated.

  Therefore, even if the fine bubble generating part 1 is arranged at a position away from the bottom part 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 part 54a. Become. For this reason, sufficient oxygen is supplied to the coral 55 distributed on the bottom 54a, the vital activity and proliferation ability of the coral 55 are activated, and the number of individuals increases significantly. (Not shown) also grows. For this reason, the organic sludge 54b in the bottom 54a can be efficiently decomposed and purified by the decomposition ability of the grown organic substance-decomposing bacteria.

  There are many unclear points as to why the fine bubbles NB of the outer diameter nanometer level formed by the fluid swirl flow R generated in the fluid swirl chamber 14 are settling in the seawater W over time. However, the amount of the bubbles levitation is small, and it is assumed that most of the fine bubbles NB are caused by moving and dispersing to the surface layer or bottom layer together with the vertical seawater mixed flow. Further, since it has been confirmed that ultrasonic waves are generated in the fluid swirl chamber 14 where the fluid swirl flow R is generated and in the vicinity thereof, the fine bubbles NB are not lowered by the action of the radiation pressure of the ultrasonic waves. It is also speculated that there is no.

  In addition, in the case of conventional fine bubbles formed by blowing air into seawater, the internal pressure is greater than atmospheric pressure, so it is difficult to break in seawater, most of which rises to the sea level and disappears. Since the fine bubbles NB supplied from the bubble generator 4 are formed in a negative pressure atmosphere by the fluid swirl flow R generated in the fluid swirl chamber 14, the internal pressure is smaller than atmospheric pressure and disappears in the seawater W. It tends to be easy. 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. In addition, 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.

  On the other hand, it was also confirmed that, at the point where the lobster 55 grew at a high density in the bottom 54a, the decomposition of organic matter and the oxidation of anaerobic acid-volatile sulfides were promoted in the bottom surface layer. Therefore, the fish sludge can be reliably purified of the organic sludge at the bottoms 54 and 54a by supplying the cultivated colony colony and supplying the fine bubbles NB into the seawater W in the fish farm 80. Moreover, in the sea area where Itokai 55 grew, the ammonia concentration in the seawater W decreased rapidly and the nitrate and nitrite concentrations increased, but this phenomenon is due to the biological activity and metabolic activity of Itokai 55. It is presumed 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.

  In addition, since most of the fine bubbles NB supplied into the sacrificial bowl 50 remain in the seawater W for a long time and gradually disappear in the seawater W, the amount of dissolved oxygen in the seawater W increases. The area disappears, and the purification action by the aerobic microorganism is activated, and the seawater W can be purified also by this. Furthermore, by operating the fine bubble generating unit 1 and supplying seawater mixed with fine bubbles NB in the seawater W in the sacrifice 50, oxygen is efficiently dissolved from the surface layer of this sea area to the bottom layer near the bottom 54a. As a result, the life activity of the cultivated pupa 53 is activated and the growth state is promoted. As a result, compared to the conventional method, the body length and weight increase of about 10% is observed in the same breeding period. It was.

  Here, an experiment was conducted on the difference in the growth state when the same-aged pods were cultivated under the same conditions in the sacrifice pod 50 in this embodiment and the conventional pod (not shown), and the results will be described. . As described with reference to FIG. 1, in the sacrifice 50, the generation of fine bubbles having the ability to supply the seawater W mixed with fine bubbles NB of 5 liters / min into the seawater W at a water depth of 7 m in the center portion. Part 1 is arranged. In such a ginger 50 and a conventional ginger (not shown) of the same scale, about 9000 individuals of 2-year-old fish are accommodated and feeding conditions are substantially the same. 1 was operated every day for a certain period of time, and the change in the weight of the pupae when bred for about three and a half months was investigated. In addition, the operation time of the fine bubble generating part 1 in the sacrifice 50 was about 15 hours every day (between 5 pm and 8 am the next morning). In addition, a lobster 55 is distributed on the bottom 54 a of the sacrifice 50.

  At the start of the experiment, the average individual weight of the cocoons in the salmon 50 was 1643.2 g, and the average individual weight of the cocoons in the conventional salmon was 1612.1 g, which can be regarded as almost the same weight. After this, while the feeding conditions were substantially the same, the fish cage 50 was reared for about three and a half months while operating the fine bubble generating unit 1 under the conditions described above. Then, when the weight of the cocoon in each sacrifice after measuring about three and a half months was measured, the average individual weight of the cocoon in the conventional sacrifice was 2066.5 g, whereas the average number of cocoons in the sacrifice 50 The weight was 2284.1 g. From these results, it can be seen that the pups bred with the ginger 50 have a weight of about 220 g more than the pups bred with the conventional ginger. In other words, it can be seen that the growth of the pupa bred with the ginger 50 is greatly promoted compared with the pupa bred with the conventional ginger.

  In the present embodiment, the case of cultivating the cocoon 53 is described, but the field of application of the present invention is not limited to this, such as hamachi, puffer fish, prawn, scallop, abalone, oyster, pearl oyster, etc. It can also be widely used in fish and shellfish farms or seaweed farms such as seaweed, kombu and kajime.

  The cypress 55 and its symbiotic bacteria are living organisms that 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 the cypress 55. Therefore, it does not adversely affect the natural environment and fish shellfish in the surrounding sea area. Further, it is only necessary to distribute the sea bream 55 on the seabed and supply the seawater W mixed with the microbubbles NB to the sea area using the microbubble generator 1 arranged in a relatively shallow sea area, so that no complicated equipment is required.

  In the present embodiment, the fluid bubble chamber 14 can be obtained simply by throwing the microbubble generator 1 into the sea to operate the electric motor 3 and supplying air from the gas pump 73 disposed on the sea to the microbubble generator 4. Since the fluid swirl flow R is formed in the inside, and the seawater W mixed with the fine bubbles NB generated thereby can be supplied into the sea, the sea area where the fish farm 80 is located can be easily purified. Since the fine bubble generator 1 has a structure in which the fine bubble generator 4, the liquid pump 2, and the electric motor 3 are integrated, the piping that becomes the introduction path of the seawater W can be minimized, and the equipment is simplified. Therefore, the size can be reduced. Moreover, since the fine bubble generator 1 is miniaturized by integrating the fine bubble generator 4, the liquid pump 2, and the electric motor 3, an occupied space can be small. For this reason, the influence with respect to the sea current etc. near the shark 53 currently cultivated in the cage 50 and the fish farm 80 is very small. If the microbubble generator 1 is continuously operated, the amount of dissolved oxygen in the seawater W in the ginger 50 and the surrounding sea area can be maintained at a saturated concentration level. Even if it is operated only from the evening when the amount decreases to the next morning, a sufficient oxygen supply effect can be obtained.

  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 on which the organic sludge 54b is deposited, and the fine bubble generating part 1 is used for fine processing. By supplying the bubbles NB into the seawater W, the organic sludge 54b deposited on the bottom 54a can be efficiently purified by generating a high-density population that cannot occur in a natural phenomenon in a short period of time. Moreover, since it is possible to eliminate the generation of anoxic water near the bottoms 54 and 54a of the fish farm 80 where the organic sludge 54b is deposited, it is possible to prevent a decrease in the activity of the cultured fish (鯛 53) due to a decrease in oxygen and poor growth. can do.

  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 spreads not only in the horizontal direction but also in the vertical direction, from the surface layer to the bottom layer (water depth of about 14 m), 1 to An increase in dissolved oxygen amount of about 2 mg / L could be confirmed. It was also found that the amount of dissolved oxygen can be efficiently increased from the surface layer to the bottom layer near the seabed by arranging one fine bubble generating part for one sacrifice 50.

  Since the fine bubble generator 1 of the present embodiment is integrated with the pump 2, the electric motor 3 and the fine bubble generator 4, it can be freely moved as it is, and the fine bubble generator 1 as a whole. Since seawater mixed with fine bubbles NB can be supplied into the seawater W simply by operating the electric motor 3 in a state where the water is immersed in the seawater W, it is extremely easy to use. Moreover, as long as the generator arranged on the sea 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.

  In the fine bubble generating portion 1, the jet port 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, so that the water jetted from the jet port 15b creates the negative pressure cavity V. Water pressure is not applied. Therefore, the negative pressure cavity V is formed substantially linearly on the axial center S of the fluid swirl chamber 14, and the position and shape thereof are kept stable, and the occurrence of cavitation erosion is prevented. The fine bubble generator 4 exhibits excellent durability.

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

  On the other hand, since the guide member 18 having the flat surface 18a intersecting the direction of the axis S is disposed at a position facing the discharge path 17 established in the partition wall 17a, the fine bubbles discharged while turning from the discharge path 17 After guiding the seawater mixed with NB so as to spread to the periphery along the plane 18a of the guiding member 18, it is possible to make three different directions from the three outlets 19, and the diffusibility of the fine bubbles NB is also good. It is.

  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 generation amount of the fine bubbles NB also increases. Further, the induction member 18 is that the seawater W in the vicinity of the discharge path 17 outside the fine bubble generator 4 is attracted to the discharge path 17 by the negative pressure of the negative pressure cavity V generated in the fluid swirl chamber 14. Therefore, the reverse flow of the seawater W into the fluid swirl chamber 14 can be prevented.

  The present embodiment is an example implemented in a fish farm 80 provided in a bay that is one of the natural closed water areas, but the sea bream 55 is formed by mixing seawater and fresh water flowing in from a river or the like. It can also live in estuaries and inner bays (so-called brackish waters) where brackish water exists constantly or seasonally. 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 effects as described above can be obtained.

  Here, with reference to FIG. 10, other embodiment regarding the fine bubble generator 4 is 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 the normal operation, the on-off valve 35a is closed. However, when dust or 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 any position on the cylindrical casing 4a, but the inner diameter of the fluid swirl chamber 14 is constant. If not, it is desirable to provide it at the maximum inner diameter portion. Other structures and functions are the same as those of the fine bubble generator 4.

  Next, with reference to FIGS. 11-14, other embodiment regarding a microbubble generator is described. 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 sectional view taken along line EE in FIG. 12, and FIG. It is a schematic diagram which shows the operating state of the microbubble generator shown.

  As shown in FIGS. 11 to 14, in the fine bubble generator 20, a cylindrical fluid swirl chamber 22 in which a fluid (seawater and air) can swirl is provided in a substantially rectangular parallelepiped casing 21, and the fluid swirl chamber 22. An air introduction path 24 for introducing air is opened in the normal direction on the inner peripheral surface 22a of the central portion in the direction of the axis S of the shaft S. In the tangential direction of the inner peripheral surface 22a of the fluid swirl chamber 22, two water introduction paths 23 capable of introducing seawater are established.

  The water introduction path 23 and the air introduction path 24 are formed so as to penetrate the casing 21, and the water introduction pipe 23 a and the air introduction pipe 24 a are connected to the 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 state of being unified on the upstream side, and the air introduction pipe 24a is extended in the direction of the water supply pipe 23b as it is.

  Further, 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 in the central part of these partition walls 21a (intersection with the axis S). Each circular discharge path 25 is opened, and a guide pipe 26 is connected to each of the two discharge paths 25. As will be described later, the guide pipe 26 communicates 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.

  As in FIG. 1, the fine bubble generator 20 is immersed in the seawater W in the sacrifice bowl 50, and the seawater is supplied from a liquid pump (not shown) disposed on the basket 71 through the water supply pipe 23 b and the water introduction pipe 23 a. And the seawater is pumped from the water introduction path 23 into the fluid swirl chamber 22, and the air is introduced from the air introduction path 24 into the fluid swirl chamber 22 via the air introduction pipe 24 a from the gas pump 73 (see FIG. 1). Is generated, 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.

  The air flowing into the fluid swirl chamber 22 from the air introduction path 24 is finely crushed by the shearing action of the fluid swirl flow R, and turns into the fine bubbles NB while rotating around the negative pressure cavity V, and eventually the discharge path. 25 is discharged as seawater mixed with fine bubbles NB. Seawater mixed with fine bubbles NB discharged from the discharge path 25 is discharged into the seawater W in the sacrifice 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.

  Further, by pumping air with the gas pump 73, it is possible to generate bubbles having an outer diameter larger than that of the fine bubbles NB together with the fine bubbles NB (the outer diameter is estimated to be about several mm). The effect | action which stirs the seawater W with a bubble can also be acquired. If an oxygen enricher (not shown) incorporating an oxygen enriched film is provided in the middle of the air supply 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 having a high oxygen concentration can be supplied into the seawater W, the dissolved oxygen concentration in the seawater W can be significantly 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 is disturbed by the surrounding seawater W. And quickly discharged in a certain direction. Therefore, 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 greatly increased. As a result, a large amount of fine bubbles NB can be stably supplied. Further, since the seawater mixed with the fine bubbles NB passes through the guide pipe 26 and is discharged into the seawater W, the flow direction is converged and the straightness is improved, so that the fine bubbles are moved to a farther region in the sacrifice 50. NB can be supplied, and the stirring action with respect to the surrounding seawater W is also exhibited. Since the fine bubble generator 20 is a system that supplies seawater from a liquid pump or the like disposed on the ridge, the underwater charging portion can be made smaller than the fine bubble generator 1. For this reason, when used in a fish farm, the influence on the fish shellfish being cultured and the nearby ocean current can be further reduced.

  Here, with reference to FIG. 15, other embodiment regarding the fine bubble generator 20 is 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 fine bubble generator 4X shown in FIG. 10, the on-off valve 37a is closed during normal operation. However, when dust or foreign matter enters the fluid swirl chamber 22, the on-off valve 37a is opened and discharged. can do. If the discharge port 38 faces the tangential direction of the inner peripheral surface 22 a of the fluid swirl chamber 22, the position of the discharge port 38 may be any position on the casing 21, but at a position facing the water introduction path 23. If established, dust or foreign matter can be quickly discharged by the water flow flowing in from the water introduction path 23. In addition, 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. In addition, it is also possible to flow seawater W into the fluid swirl chamber 22 from the outside through the discharge pipe 37 with the open / close valve 37a opened. A gas-liquid swirl flow swirling in a direction opposite to the flow R can be generated. Other structures and functions are the same as those of the fine bubble generator 20.

  Next, with reference to FIGS. 16 to 18, other embodiments relating to the fine bubble generator will be described. 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. . In addition, in the fine bubble generator shown in FIGS. 16-18, about the part which has the same structure and function as the fine bubble generator 20 mentioned above, the same code | symbol as the code | symbol shown in FIGS. 11-14 is attached | subjected, and description is abbreviate | omitted. To do.

  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 24 a in the fine bubble generator 20 described above are eliminated, and the rest is the same as the fine bubble generator 20. It is. In the fine bubble generator 30, a mixed fluid of seawater and air is supplied via the fluid supply pipe 33 b and the fluid introduction pipe 33 a, and the mixed fluid is tangential to the inner peripheral surface of the fluid swirl chamber 32. Seawater mixed with fine bubbles NB generated by introducing the fluid into the fluid swirl chamber 32 from the arranged fluid introduction path 33 and swirling at high speed is supplied into the seawater in the sacrifice 50 through the discharge path 25 and the guide pipe 26.

  In the case of the fine bubble generator 30, the seawater mixed with the fine bubbles NB is discharged by feeding a mixed fluid of seawater and air into the fluid swirl chamber 32 via one fluid feed pipe 33b. Therefore, there is no need for a long air feed pipe, etc., piping and handling are easy, and there is no possibility of clogging the air feed pipe. Moreover, the outer diameter of the generated fine bubbles NB can be increased / decreased by increasing / decreasing the air mixing rate in the mixed fluid of air and seawater fed from the sea via the fluid feed pipe 33b. Other structures and functions are the same as those of the fine bubble generator 20.

  In the above embodiment, the case where the fine bubble generators 4, 20, 30 and the like are arranged in the seawater W to cultivate the fish and shellfish while purifying the sea area has been described. Since it is not limited to this, it can also be implemented as a fish and shellfish culture method in freshwater or brackish water. That is, the fine bubble generators 4, 20, 30 and the like are arranged in a fresh water area or a brackish water area, and water and air are supplied to the fine bubble generators 4, 20, 30 in the fluid swirl chambers 14, 22, 32. It is also possible to supply fresh water mixed with fine bubbles NB generated by the fluid swirl flow R formed into the fresh water area and supply oxygen to benthic organisms that inhabit the bottom of these water areas. As a result, it is possible to purify the water quality and bottom quality of freshwater bodies and brackish water areas, and therefore, it is possible to promote the growth state of fish shellfish bred in these water areas.

  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 provided in a coastal water area, and also as a fish shell culture method in a natural sea area, brackish water area or fresh water area. Can be widely used.

It is a schematic block diagram which shows the fish and shellfish farm using the fish and shellfish cultivation method which is embodiment of this invention. It is the elements on larger scale which show the management system in the fish and shellfish farm shown in FIG. It is the elements on larger scale near the fine bubble generator shown in FIG. FIG. 4 is a partially omitted plan view of the microbubble generator shown in FIG. 3. It is a partially cutaway side view which shows the microbubble generator which comprises the microbubble generator shown in FIG. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is sectional drawing which shows other embodiment regarding the microbubble generator shown in FIG. It is a figure which shows 2nd Embodiment regarding a microbubble generator. It is a perspective view of the fine bubble generator shown in FIG. It is the EE sectional view taken on the line in FIG. It is a schematic diagram which shows the operating state of the fine bubble generator shown in FIG. It is sectional drawing which shows other embodiment regarding the microbubble generator shown in FIG. It is a perspective view which shows 3rd Embodiment regarding a microbubble generator. It is the FF sectional view taken on the line in FIG. It is a schematic diagram which shows the operating state of the fine bubble generator shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine bubble generation | occurrence | production part 1a, 74a Wire 2 Liquid pump 2a Suction port 3 Electric motor 4, 4X, 20, 20X, 30 Fine bubble generator 4a Cylindrical casing 5 Power supply cord 8 Water discharge part 9 Supply pipe 13 Check valve 14, 22, 32 Fluid swirl chambers 14a and 22a Inner peripheral surfaces 15 and 23 Water introduction path 15a Blocking plate 15b Jet port 15c Connection part 16 and 24 Air introduction path 16a Tip opening part 17 and 25 Discharge path 17a and 21a Partition 18 Guide member 18a Plane 18b , 18c Connecting member 19 Outlet 21 Casing 23a Water introduction pipe 23b Water supply pipe 24a Air introduction pipe 26 Guide pipe 33 Fluid introduction path 33a Fluid introduction pipe 33b Fluid feed pipe 35, 37 Discharge pipe 35a, 37a On-off valve 36, 38 Drain Exit 50 Sacrifice 51,71 ５２52 Net 53 ５４54,54a Bottom 54 b 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 S Shaft center V Negative pressure cavity W seawater W1 sea level

Claims (5)

  Fine bubbles generated by a fluid swirl flow formed in the fluid swirl chamber by disposing a fine bubble generation means containing a fluid swirl chamber in the water area to be purified and supplying water and air to the fine bubble generation means A method for cultivating fish and shellfish, characterized by feeding mixed water into the water area and raising fish and shellfish in the water area that is purified by supplying oxygen to benthic organisms that inhabit the bottom of the water area.   Disperse cloverfish 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 area on the distribution area of the crawfish, and add 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 region, and oxygen to benthic organisms and staghorns living at the bottom of the water region. 2. A method for cultivating fish and shellfish, comprising raising fish and shellfish in the water area purified by supplying the fish and shellfish. As the fine bubble generating means,
A cylindrical or rotating fluid swirl chamber in which fluid can swirl 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 shaft center for discharging water containing fine bubbles from the fluid swirl chamber. A fine bubble generator having a discharge path provided on an extension line of
A liquid pump for supplying water into the fluid swirl chamber via the water introduction path;
A gas pump for supplying air into the fluid swirl chamber via the air introduction path;
The fish shellfish cultivation method according to claim 1 or 2, wherein a microbubble generator comprising As the fine bubble generating means,
A cylindrical or rotating fluid swirl chamber in which fluid can swivel around an axis, and air-mixed water is fed into the fluid swirl chamber along a direction that forms a twist position with the shaft center. A fine bubble generator comprising: an air / water introduction path disposed on the fluid center; and a discharge path disposed on an extension line of the axis for discharging water mixed with fine bubbles from the fluid swirl chamber;
A liquid pump for supplying water into the fluid swirl chamber via the air-water introduction path;
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 a microbubble generator comprising As the fine bubble generating means,
A cylindrical or rotating fluid swirl chamber in which fluid can swirl 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 into the fluid swirl chamber, and the shaft center for discharging water mixed with fine bubbles from the fluid swirl chamber. A fine bubble generator having a discharge path provided on an extension line of
A waterproof liquid pump that feeds 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 generating unit that integrates a waterproof drive for operating the liquid pump;
A gas pump that feeds air into the fluid swirl chamber via the air introduction path of the microbubble generator;
The fish shellfish cultivation method according to claim 1 or 2, wherein a microbubble generator comprising

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