JP6886754B2 - Conger eel farming cage and conger eel farming method - Google Patents

Description

The present invention relates to aquaculture cages for conger eels and methods for aquaculture of conger eels, and in particular, can breed conger eel larvae or fry or juveniles with an extremely high survival rate, reduce energy consumption, and have a bacterial treatment effect and physiological activity. Conger eel farming cages and farming methods that can be effective.

The ecology of the natural conger eel, which belongs to the family Eelidae and is a demersal fish, has many mysteries like eels and has not been elucidated in detail. In general, the habitat of natural whitespotted congers is seaweed, sandy mud, and reefs in the inner bay, and in particular, it inhabits relatively muddy places such as estuaries where seawater and freshwater are mixed, and is resistant to turbidity even at 100 ppm. It has no effect and is said to prefer to live in holes.

In terms of taste, the whitespotted conger, which lives in relatively mud areas such as the estuary where seawater and freshwater are mixed, is said to be the most delicious. Regarding the water temperature, it is not possible to live below 10 ° C, but it lives above 11 ° C and usually prefers 18 to 20 ° C.

In addition, spawning of natural whitespotted conger is carried out in the open sea, and it comes to the inland sea as leptocephalus (leaf-shaped larva) from March to May, and in summer it becomes a fry of whitespotted conger about the size of a toothpick, and its body length is about 7.0 cm. is there.

The growth process of conger eels is: larvae (Leptocephalus = Noresole) → fry (larvae are metamorphosis = Shirasu) → juveniles (30 g or less) → young fish (100 g or less) → immature fish (120 g or more that can be sold) → adult fish (breeding) (150 g or more for males and 300 g or more for females).

At present, such conger eels are cultivated (livestock) on a small scale in land-based aquaculture (running water-based land-based aquaculture / circulation-type land-based aquaculture). In this land-based aquaculture, underground seawater or deep seawater is taken into the aquaculture tank for aquaculture. In the case of underground seawater or deep seawater, the average annual water temperature is stable at 18 ° C to 20 ° C, which is the optimum breeding water temperature condition.

However, conger eel farming at these onshore facilities has the following problems.

In running water type aquaculture, since the seawater temperature cannot be adjusted, the seawater temperature in summer becomes 22 ° C or higher, which causes a large amount of mortality in summer as shown in FIGS. 5 (a) and 5 (b), and in summer. It is not suitable for conger eel farming unless the measures against water temperature are solved. The number of conger eels begins to increase when the natural seawater exceeds 20 ° C. From 23 ° C to 26 ° C, the number of mortality increases remarkably, and the overall survival ratio becomes 50% or less, making it unprofitable. As shown in FIG. 5, the survival rate is 90% or more before the high water temperature period, but the survival rate drops to 45% at the high water temperature period. Of the number of conger eels dying at high water temperatures, 85% are young to young fish weighing 90 g or less. Obviously, the high water temperature is the cause of the death. A large number of weak young fish (30 g or less) or young fish (40 g to 90 g) die.

When the cells of the dead conger eel were collected and examined, it was found that there were gliding bacteria on the surface of the eye, gills, etc. If you have gliding bacteropathy, you will have difficulty breathing and die when you reach the gills. In addition, symptoms centered on trauma occur, and the head, torso, etc. are swollen, scooped out, or scorched. As a factor, it was found that gliding bacteria became active above 18 ° C. and became more active as the water temperature increased. As the environment changes, that is, the water temperature rises, the mucosal condition of the body surface of weak larvae or fry or juveniles deteriorates, and gliding bacteria attach to the body surface from those with weak physical strength, causing trauma. On the other hand, there are no chemicals related to conger eels and they cannot be used under the Pharmaceutical Affairs Law.

It was also found that one of the reasons for the death was the outbreak of gas disease. Gas disease is a symptomatology in which the seawater in the gill contains a large amount of nitrogen, and when air enters the capillaries, the eyes become like eyes and gill breathing becomes difficult. And die.

In addition, since it is a circulation type, there is a problem that fat generated in feeding (live food) accumulates in the cage.

On the other hand, in circulation type land culture, the seawater temperature can be adjusted by heating and cooling, but if the water temperature is maintained at a constant temperature of 18 ° C to 20 ° C throughout the year, a large amount of energy is consumed, so the equipment burden and the overall water temperature are increased. Considering the price of Anago (market price of 2,000 to 2,500 yen), the running cost is too high and the profitability is poor.

In running water type onshore facilities that use deep water, the burden of equipment costs and equipment costs for pumping deep water and a large amount of energy are consumed at the time of suction, so the overall energy consumption burden is large and the price of Anago (market) Considering the price (2,000 yen to 2,500 yen), the running cost is too high and the profitability is poor. In addition, land facilities that use deep sea water are limited in location due to location conditions.

Since sea surface aquaculture is not suitable at high water temperatures, no examples of sea surface aquaculture have been reported.

Therefore, an object of the present invention is that larvae or fry or fry of anago can be bred with an extremely high survival rate, energy consumption can be reduced, and bacteria generated in a high water temperature period can be treated with bacteria other than chemicals. Biological activation that can strengthen the physical strength of larvae or fry or juveniles is required. Further, the present invention provides a conger eel farming cage and a conger eel farming method capable of treating the fat generated in feeding by releasing nitrogen contained in the seawater in the cage into the air.

The anago farming cage of the present invention is an anago farming cage that cultivates anago larvae, fry or juveniles in a cage composed of a main cage and a sub cage while circulating seawater in order to achieve the above object. , A filtration device that filters the seawater, an ozone generator that generates ozone to sterilize the seawater filtered by the filtration device, and a heating device that heats the seawater that has been sterilized by the ozone generator. , The seawater supply pump that supplies the seawater that has been heated and sterilized by the heating device and the ozone generator to the cage, and the seawater that contains ozone when the seawater supply pump supplies the seawater to the cage, generates nanobubbles. The main cage is composed of an ozone nanonozzle device that generates ozone nanobubbles in ozone seawater surrounded by a large amount of ions to make ozone nanoseawater, and a bubble nanonozzle device that supplies oxygen to the ozone nanoseawater. It has an opening leading to a sub cage and an ozone nano seawater tapping cradle that releases nitrogen into the air by tapping the ozone nano seawater, and the seawater discharged from the cage is supplied to the filtration device and circulated. We provide aquaculture cages for anago, which is characterized by this.

In the above configuration, the heating device is characterized in that the seawater is heated to 20 ° C. to 28 ° C.

Further, the main cage is characterized in that the floor has a double floor structure.

Further, the double floor bottom is characterized in that the upper floor surface has a mesh-like structure.

Further, the upper floor surface is characterized in that a sheet-like material that blocks light is provided as a bed for the family Conger eels of the order Eelidae.

Further, it is characterized in that a fat adsorption mat is provided in the settling tank, the filtration tank and the water storage tank.

Further, the present invention is to achieve the above object, example the larvae or fry or juvenile sea eel was put into seawater in the cages, changes Ozon'nano seawater to generate nanobubbles against seawater in the cages By supplying oxygen to the ozone nano seawater, it is changed into fine bubble ozone nano seawater, and the seawater in winter is heated to 20 ° C. to 28 ° C. over 5 to 10 days to create a high water temperature environment. The feature is that the larvae or fry or larvae are bred for 3 months and experienced at the stage of larvae or fry or larvae so as to withstand the high water temperature, and at the same time the survival rate is improved by nano seawater. Provide a method for cultivating juvenile fish.

Further, the present invention is that the larvae or fry or juvenile sea eel was caught catching poured into seawater circulating in seawater farming pens, varied Ozon'nano seawater to generate nanobubbles against seawater in the cages, the Ozon'nano By supplying oxygen to seawater, it is transformed into fine-bubble ozone nano-seawater, and the seawater in winter is heated to 20 ° C to 28 ° C over 5 to 10 days to create a high water temperature environment. Raise larvae or fry or juveniles for 3 months and experience them at the stage of larvae or fry or juveniles so that they can withstand the high water temperature. Provided is a method for cultivating anago, which is characterized by moving to a formal land facility and culturing.

Further, the present invention is that the larvae or fry or juvenile sea eel was caught catching poured into seawater circulating in seawater farming pens, varied Ozon'nano seawater to generate nanobubbles against seawater in the cages, the Ozon'nano By supplying oxygen to seawater, it is transformed into fine-bubble ozone nano-seawater, and the seawater in winter is heated to 20 ° C to 28 ° C over 5 to 10 days to create a high water temperature environment. The larvae or fry or juveniles are bred for 3 months and experienced at the stage of the larvae or fry or juveniles so that they can withstand the high water temperature, and at the same time, the survival rate is improved by nano seawater and the water temperature cannot be adjusted in the summer. Provided is a method for cultivating anago, which is characterized by moving to aquaculture facility and culturing.

Since the present invention is configured as described above, conger eel larvae or fry or juveniles bred in nano-seawater at 20 ° C. or higher for 3 months are subject to high water temperature conditions due to the effect of ozone nano-seawater and fine-bubble nano-seawater. It can be bred with a high survival rate. Conger eels bred in this circulating nano-seawater aquaculture cage can improve a large amount of mortality in the running water type at seawater temperature in summer.

It is an overall block diagram of the conger eel farming cage which concerns on embodiment of this invention. It is a block diagram of a circulation type seawater aquaculture cage. It is a detailed view of a main cage and a sub cage. It is explanatory drawing of the ozone nano seawater tapping cradle. It is a detailed view of a double floor bottom, a floor pedestal, and a bubble nanonozzle. It is a graph which shows the number of conger eels dying in 2006 and calm 2007 in a running water type aquaculture cage.

Hereinafter, the conger eel farming cage and the conger eel farming method according to the embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall configuration diagram of a conger eel farm cage according to an embodiment of the present invention.
As shown in the figure, the conger eel farming cage is a farming cage that cultivates conger eel larvae, fry or juveniles in the main cage 1 while circulating the seawater supplied from the water supply device 4.

In this culture cage, ozone is applied to the filtration device 5 that filters the seawater supplied from the water supply device 4, the water storage tank 6 that stores the seawater filtered by the filtration device 5, and the seawater stored in the water storage layer 6. An ozone generator 19 that generates and sterilizes, a heating device 7 that heats seawater sterilized by the ozone generator 19 to 20 ° C to 28 ° C, and a heating device 7 and an ozone generator 19 that heat and sterilize. A seawater supply pump 8 that supplies the generated seawater to the main cage 1, an ozone nanonozzle device 9 that generates nanobubbles in the seawater supplied to the main cage 1 by the seawater supply pump 8 and uses natural seawater as ozone nano seawater. The ozone nano seawater in the main cage 1 is supplied to the bubble nanonozzle 13c through the coupling pipe 13a through the pump 13, and at the same time, air is supplied to the bubble nanonozzle 13c through the air hose 13b to form fine bubble nanoseawater.
A sub cage 2 is provided adjacent to the main cage 1. The sub cage 2 selects and cultivates fry or juvenile conger eels that cannot be cultivated in the main cage 1.

In the above configuration, the nano seawater discharged from the main basin 1 and the sub basin 2 is returned to the settling tank 15 by the pump 17 through the drainage pipe 14 and the pipe 18, and is supplied to the filtration device 5 and the water storage tank 6 again by the pump 17. Is circulated in the device. The filtration device 5, the water storage tank 6, and the settling tank 15 are all provided with a fat adsorption mat so that the fat adsorption mat adsorbs the fat floating with the circulating seawater generated from the feed. I have to.

The main cage 1 includes an anago bed 11, a double floor bottom 12 and a double floor bottom cradle 12a, and a drainage pipe 14 and a pump 17 for discharging the filth of the main cage 1 to the settling tank 15 described above. , A sorting opening 3 communicating with the sub cage 2 is provided.

The ozone nanonozzle device 9 is a device that generates ozone nanobubbles in ozone seawater surrounded by a large amount of ions. In the case of seawater containing ozone nanobubbles, the effect as ozone seawater can be maintained for an extremely long period of time.

Normal ozone seawater loses the effect of ozone in 1 to 2 hours, but ozone nanobubbles have succeeded in retaining ozone for 1 month or more. Therefore, it has a bacterial bactericidal effect that does not rely on chemicals.

In addition, its excellent penetrating ability into the skin and the like has been demonstrated, and it acts not only on the surface but also on the inside. In this way, seawater containing ozone nanobubbles can improve the adaptability of fish and shellfish to environmental changes.

The ozone nano seawater discharged from the ozone nano nozzle device 9 is struck by the ozone nano seawater tapping cradle 20 to release nitrogen into the air and is injected into the main cage 1.

The bubble nanobubble 13c further transforms the ozone nanobubbles produced by the ozone nanonozzle device 9 into oxygen nanobubbles, and by transforming the ozone nanobubbles into oxygen nanobubbles, a physiologically active effect is brought about. Therefore, it has the effect of improving the adaptability of seafood to environmental changes and rapidly recovering weakened seafood. Oxygen nanobubbles have been demonstrated to have excellent penetrating ability into the skin and the like, and it has been reported that they act not only on the surface but also on the inside.

In the present invention, paying attention to these points, seawater is sterilized with ozone generated by an ozone generator, the sterilized seawater is converted into ozone nanoseawater by the ozone nanonozzle device 9, and fine bubble nanoseawater is converted by the bubble nanonozzle 13c. The bactericidal effect and the bioactive effect improve the adaptability and physical condition of the ozone to environmental changes, and the heating device 7 warms the seawater to improve the resistance of the ozone to the temperature. ..

FIG. 2 is a detailed view of the main cage 1 and the sub cage 2. FIG. 2 (a) is a plan view, and FIG. 2 (b) shows the sorting opening 3 provided in the main cage 1 as a sub from the main cage 1. FIG. 2 (c), which is a view toward the cage 2 side, is a cross-sectional view showing the details of the sorting opening 3.

Conger eels are nocturnal and do not come out of bed during the day. If the conger eel fry or juveniles put into the main cage 1 are not suitable for aquaculture after being put in, they will get out of the conger eel bed in the daytime and swim along the surface of the seawater along a circular stream in 2 to 14 days. There is. Therefore, an opening is provided so that the main cage 1 can be transferred to the sub cage 2. However, conger eels that can be cultivated come out of the bed at night. Opening is limited to daytime hours. Since the conger eel is nocturnal, a sheet-like object that can block light is used as the bed 11 of the conger eel, and as shown in the figure, one or more places are arranged in the main cage 1 and the sub cage 2.

FIG. 3 is a diagram for explaining the ozone nano seawater tapping cradle 20. 3 (a) is a schematic view thereof, FIG. 3 (b) is an enlarged view from the front side of the portion surrounded by the round circle A of FIG. 3 (a), and FIG. 3 (c) is FIG. 3 (b). ) Is a side view.
As shown in FIG. 3C, the ozone nano seawater tapping cradle 20 is a triangular prism, the bottom 20a and the back 20b are plate-shaped, and the inclined portion 20c is composed of a fine mesh net. Nitrogen is released into the air by tapping the ozone nano seawater discharged from the ozone nano nozzle device 9 against the ozone nano seawater tapping cradle 20.

Hitting ozone nano seawater with the ozone nano seawater beating cradle 20 is a countermeasure against gas diseases. Nitrogen gas is generated by the suction force of a powerful pump, etc., and the seawater in the cage may contain a large amount of nitrogen. If a large amount of nitrogen is contained, gas disease will occur, leading to the death of conger eels.

As a solution to this, in the present invention, instead of directly injecting the seawater discharged from the seawater supply pump 8 into the cage, the seawater discharged from the seawater supply pump 8 is once received by the ozone nano seawater tapping cradle 20 to strike the seawater. , Nitrogen contained in seawater was released into the air and then injected into the main cage 1.

FIG. 4 is a detailed view of the double floor bottom 12 and the bubble nanonozzle 13c. FIG. 4A is a schematic plan view thereof, and FIG. 4B is a schematic cross-sectional configuration diagram.
Since the anago is a bottom fish, sufficient oxygen is required on the bottom surface, and the inside of the sheet-shaped anago bed 11 is deficient in oxygen. The upper floor 12a is received by the double floor bottom cradle 12c to form a double bottom, and the double floor bottom 12 is prevented from lacking oxygen so that the sea current flows through the upper floor 12a and the lower floor 12b.

In addition, since conger eels are demersal fish, the double-bottomed upper floor 12a has a mesh-like floor surface so that oxygen can flow. Further, the ozone nano seawater in the main cage 1 is injected into the bubble nanonozzle 13c through the coupling pipe 13a of the pump 13, and at the same time, air is injected into the bubble nanonozzle 13c through the air hose 13b to further inject the ozone nanoseawater in the cage into the fine bubble nano. Transform into seawater. As a result, the entire main cage 1 is agitated, and it is possible to prevent the bottom surface of the main cage 1 from becoming oxygen-deficient.

The method of culturing conger eels using the above cages is as follows.
(1) The larvae or fry or fry of the anago caught from winter to spring (from around December to around May of the following year) are put into the seawater in the above-mentioned circulating sea main cage 1, and the seawater in the main cage 1 is ozone. The nano-nozzle device 9 is used to change to ozone nano-seawater, the ozone nano-seawater in the main cage 1 is changed to fine-bubble ozone nano-seawater by the bubble nano-nozzle 13c, and the seawater in winter is added to 20 ° C to 28 ° C over 5 to 10 days. A high water temperature environment is created by heating with a heating device 7, and larvae or fry or juveniles of Anago are bred in the high water temperature environment for 3 months. In addition, depending on the time of capture of larvae, fry or juveniles, the larvae or fry or juveniles are bred in the high water temperature environment until the natural seawater temperature exceeds 20 ° C. At the same time as experiencing it at the stage of juvenile fish, the survival rate will be improved by ozone nano seawater and fine bubble ozone nano seawater, and in the summer, it will be cultivated by moving to a running water type land facility where the water temperature cannot be adjusted.

(2) The larvae or fry or fry of the anago caught from winter to spring (from around December to around May of the following year) are put into the seawater in the above-mentioned circulation type main cage 1, and the seawater in the main cage 1 is put into ozone nano. The nozzle device 9 changes the ozone nano seawater in the main cage 1 into fine bubble ozone nano seawater by the bubble nano nozzle 13c, and the seawater in winter is heated to 20 ° C to 28 ° C over 5 to 10 days. It is heated by the device 7 to create a high water temperature environment, and larvae or fry or juveniles of Anago are bred in the high water temperature environment for 3 months. In addition, depending on the time of capture of larvae, fry or larvae, the larvae or fry or larvae are bred in the high water temperature environment until the natural seawater temperature exceeds 20 ° C. At the same time as experiencing it at the stage of juvenile fish, the survival rate will be improved by ozone nano seawater and fine bubble ozone nano seawater, and in the summer, it will be cultivated by moving to a sea surface aquaculture facility where the water temperature cannot be adjusted.

Depending on the time of capture of the larvae, fry or juveniles, the larvae or fry or juveniles may be bred in the high water temperature environment until the natural seawater temperature exceeds 20 ° C. At the same time as experiencing the fry or juvenile stage, improve the survival rate with ozone nano seawater and fine bubble nano seawater, and move to a sea surface aquaculture facility where the water temperature cannot be adjusted in the summer to cultivate.

<Test example>
A nanobubble generator with a nanonozzle (manufactured by Nakata Coating Co., Ltd.) directly connected to a domestic seawater pump was installed in a 1000 L (liter) circulating aquaculture cage with an average water temperature of 25 ° C, and 200 maanago fish with an average weight of 30 g (total weight 6 kg). ) Fry or juveniles were housed, and live food was used as feed, and the animals were fed once a day with satiety and bred for 90 days (January 12 to April 11, 2016).

As a result, the total body weight of the whitespotted conger at the end of the experiment was 12 kg. The survival rate was 97%. In conventional large-scale aquaculture, the number of mortality began to increase when the temperature exceeded 23 ° C, and the number of mortality increased sharply when the temperature exceeded 24 ° C to 25 ° C, and the survival rate decreased to 45%. , I was able to achieve a breakthrough improvement in the survival rate.

This is because seawater is made into extremely fine nano-seawater and adapted to high water temperature at the stage of larvae or fry or juveniles, and resistance to seawater temperature is cultivated, resulting in a survival rate of 90% or more. Conceivable. This eliminates the need to cool seawater, reduces costs, and enables aquaculture methods that combine land-based aquaculture and sea-surface aquaculture.

<Summary>
In this way, conger eel larvae, fry or juveniles bred in nano-seawater at 20 ° C or higher for 3 months can be bred with a high survival rate despite high water temperature conditions due to the nano-seawater effect, and in summer. Even if the conger eels are transferred to the sea surface during the season, sea surface cultivation is possible.

Although there are no reference examples or successful examples of anago farming on the sea surface, by combining this circulation type seawater aquaculture cage with, for example, a rotary aquaculture cage on the sea surface as described in Japanese Patent No. 5936005. Sea surface aquaculture becomes possible.

With this development, unprecedented aquaculture of conger eels in running water aquaculture and sea surface aquaculture can be realized. In addition, aquaculture of other species of fry and shellfish can be realized.

1 Main basin 2 Sub basin 3 Sorting opening 4 Water supply device 5 Filtering device 6 Water storage tank 7 Heating device 8 Seawater supply pump 9 Ozone nanonozzle device 11 Anago bed 12 Double floor bottom 12a Double floor cradle 13 Pump 13a Coupling pipe 13b Air hose 13c Bubble nanonozzle 14 Drainage pipe 15 Settlement tank 17 Pump 18 Piping 19 Ozone generator 20 Ozone nano seawater tapping cradle

Claims (8)

An aquaculture cage that cultivates conger eel larvae or fry or juveniles in a cage consisting of a main cage and a sub cage while circulating seawater.
A filtration device that filters the seawater, an ozone generator that generates ozone to sterilize the seawater filtered by the filtration device, and a heating device that heats the seawater that has been sterilized by the ozone generator. A seawater supply pump that supplies seawater that has been heated and sterilized by the heating device and the ozone generator to the fish cage, and seawater that contains ozone when the seawater supply pump supplies the seawater to the fish cage to generate nanobubbles. It consists of an ozone nanonozzle device that generates ozone nanobubbles in ozone seawater that is surrounded by a large amount of ions to make ozone nanoseawater, and a bubble nanonozzle device that supplies oxygen to the ozone nano seawater. It has an opening leading to the cage and an ozone nano seawater tapping cradle that releases nitrogen into the air by tapping the ozone nano seawater, and the seawater discharged from the cage is supplied to the filtration device and circulated. Anago farmed ozone characterized by. The conger eel farming cage according to claim 1, wherein the heating device heats the seawater to 20 ° C. to 28 ° C. The conger eel farming cage according to claim 1, wherein the main cage has a double-floor structure. The conger eel farming cage according to claim 3, wherein the double floor bottom has a mesh-like structure on the upper floor surface. The conger eel farming cage according to claim 4, wherein a sheet-like material that blocks light is provided on the upper floor surface as a bed for the conger eel family of the order Eelidae. Example was charged with larvae or fry or juvenile sea eel in seawater in the pens, the against the seawater in the pens to generate nanobubbles varied Ozon'nano seawater, micro-bubbles by supplying oxygen to the Ozon'nano seawater It is changed to ozone nano seawater, and the seawater in winter is heated to 20 ° C to 28 ° C over 5 to 10 days to create a high water temperature environment, and the larvae, fry or juveniles are bred for 3 months in the high water temperature environment. A method for cultivating anago, which comprises experiencing the larvae, fry or juveniles at the stage of being able to withstand the high water temperature, and at the same time improving the survival rate by nano-seawater. The example was larvae or fry or juvenile sea eel were placed in seawater circulating in seawater farming pens, varied Ozon'nano seawater to generate nanobubbles against seawater in the pens, to supply oxygen to the Ozon'nano seawater By doing so, it is changed to fine bubble ozone nano seawater, and the seawater in winter is heated to 20 ° C to 28 ° C over 5 to 10 days to create a high water temperature environment, and the larvae, fry or juveniles are placed in the high water temperature environment. It will be bred for 3 months and experienced at the stage of larvae, fry or juveniles so that it can withstand the high water temperature, and at the same time, the survival rate will be improved by nano seawater, and in the summer it will be transferred to a running water type land facility where the water temperature cannot be adjusted. A method of cultivating anago, which is characterized by culturing. The example was larvae or fry or juvenile sea eel were placed in seawater circulating in seawater farming pens, varied Ozon'nano seawater to generate nanobubbles against seawater in the pens, to supply oxygen to the Ozon'nano seawater By doing so, it is changed to fine bubble ozone nano seawater, and the seawater in winter is heated to 20 ° C to 28 ° C over 5 to 10 days to create a high water temperature environment, and the larvae, fry or juveniles are placed in the high water temperature environment. It is bred for 3 months and experienced at the stage of larvae, fry or juveniles so that it can withstand the high water temperature, and at the same time, the survival rate is improved by nano-seawater, and in the summer, it is transferred to a sea surface aquaculture facility where the water temperature cannot be adjusted for aquaculture. Anago farming method characterized by the fact that it is used.

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