JP6829557B2 - Eel farming system and eel farming method - Google Patents

Description

The present invention relates to, for example, techniques for culturing eels.

Conventionally, in eel farming, appropriate filtration is performed in order to improve the water quality. As one of such filtration devices, a fish water purification device using an aeration pipe or the like has been proposed (see Patent Document 1).

This fish water purification device is provided with a means for coagulating organic matter dissolved in water by fine bubbles generated from an aeration pipe to form bubbles containing the organic matter, and removing the bubbles containing the organic matter to the outside of the purification device. There is. It is stated that this makes it possible to infiltrate oxygen into purified water, separate and remove organic matter generated from fish and bait by fine bubbles, and reduce the pollution load.

Further, as a device for purifying an eel pond, a fishpond purification device has been proposed (see Patent Document 2). This fishpond purification device pumps water from the fishpond or the purification equipment of the fishpond, mixes the water with the air sucked from the water ejector, passes it through a water activator, and returns it to the fishpond. is there. As a result, it is said that the aquaculture pond can be purified without any effort if only the initial investment is made.

Here, in aquaculture of eels, the collected or purchased glass eels are put into a fishpond, the glass eels are raised to obtain adult eels, and the adult eels are shipped. Raising glass eels, which is the initial stage of aquaculture, is the most difficult, and relatively many individuals die during aquaculture. For this reason, the yield is inevitably poor, and the surviving eels are cultivated.

However, if the yield is poor, the ratio of the shipment value of adult eels to the purchase value of glass eels becomes small, and there is a problem that it is difficult to earn profits. For this reason, it has been desired to reduce the mortality rate of glass eels as much as possible and improve the yield.

Japanese Unexamined Patent Publication No. 7-46950 JP-A-2010-263977

An object of the present invention is to enable eels to be cultivated with a high yield in view of the above-mentioned problems.

The present invention includes a plurality of aquariums for storing water, a water supply means for supplying water to each aquarium, and a filtering device for filtering the water. The aquarium is a glass eel aquarium for cultivating glass eels. When the Kurokounagi aquaculture water tank for farming Kurokounagi, and Naruunagi aquaculture water tank for farming separately provided the Naruunagi, the filtration device, the glass eel breeding aquarium, the Kurokounagi aquaculture water tank, and the Naruunagi aquaculture water tank Each of the adult aquariums is provided, and the adult aquarium has at least three size-specific adult aquariums that are divided and cultivated in at least three stages according to the size of the growing eel. The water tank includes a suction bag formed of a non-woven fabric and a pump for supplying water inside the suction bag as the filtration device, and the pump attaches dust to the surface of the suction bag which is a non-woven fabric by supplying water. It is characterized by a eel farming system to be used and a eel farming method using the same.

According to the present invention, eels can be cultivated with good yield.

Configuration diagram of the eel farming system. Explanatory drawing explaining the structure of the glass eel aquaculture tank and the filtration device. Explanatory drawing explaining the structure of a black eel culture aquarium and a filtration apparatus. A frontal longitudinal view illustrating the configuration of an eel aquaculture tank and a filtration device by size. A frontal longitudinal view illustrating the configuration of a large eel aquaculture tank and a filtration device. A flowchart illustrating a method of eel farming using an eel farming system.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration diagram of an eel farming system 1. In this embodiment, the terms glass eel, black eel, and adult eel are used properly according to the growth stage of the eel. When simply referring to eel, it means that the eel may be at any stage without distinguishing between glass eel, black eel, and adult eel.

The eel culture system 1 includes a groundwater supply device 3 (water supply means) that supplies groundwater, and a plurality of culture tanks (10, 20, 30A, 30B, 30C, 30D, 30E,) that receive groundwater supply from the groundwater supply device 3. 40) and the filtration devices 11, 11, 31A, 31B, 31C, 31D, 31E that filter the water stored in each of the aquariums (10, 20, 30A, 30B, 30C, 30D, 30E, 40), respectively. , 41 and a drainage device 5 for treating the wastewater from each aquarium (10, 20, 30A, 30B, 30C, 30D, 30E, 40).

The waterways from the groundwater supply device 3 to each aquaculture tank (10, 20, 30A, 30B, 30C, 30D, 30E, 40) are all divided in parallel, and each aquaculture tank (10, 20, 30A) from the groundwater supply device 3 , 30B, 30C, 30D, 30E, 40), groundwater is directly supplied. That is, groundwater is not supplied through other aquaculture tanks. In addition, each aquaculture tank (10, 20, 30A, 30B, 30C, 30D, 30E, 40) independently has its own filtration device 11, 11, 31A, 31B, 31C, 31D, 31E, 41. It has an independent filtration system. As a result, in all aquaculture tanks (10, 20, 30A, 30B, 30C, 30D, 30E, 40), other aquaculture tanks (10, 20, 30A, 30B, 30C, 30D, 30E, 40) do not affect. An independent water environment has been realized.

This eel farming system 1 is installed indoors. This prevents rainwater and the like from entering the aquaculture tanks (10, 20, 30A, 30B, 30C, 30D, 30E, 40) and the filtration devices 11, 11, 31A, 31B, 31C, 31D, 31E, 41. .. In addition, the indoors where the eel farming system 1 is installed are equipped with air conditioning equipment. As a result, the temperature is controlled so that the temperature suitable for the growth of eel can be maintained.

The aquaculture tanks (10, 20, 30A, 30B, 30C, 30D, 30E, 40) are a glass eel farming tank 10 for growing glass eels, a black eel farming tank 20 for growing black eels, and a size-based aquaculture tank for growing eels by size. It has a water tank 30 (30A to 30E) and a large eel farming water tank 40 for growing adult eels that have grown to a size that can be shipped or a size close to the size that can be shipped. The size-specific adult eel aquaculture tanks 30 (30A to 30E) and the large-sized adult eel aquaculture tanks 40 are adult eel aquaculture tanks for cultivating adult eels.

2A and 2B are explanatory views for explaining the configuration of the glass eel farming tank 10 and the filtration device 11, FIG. 2A is a front vertical sectional view, and FIG. 2B is a right side vertical sectional view.

As shown in FIG. 2B, the glass eel farming aquarium 10 has a rectangular parallelepiped container shape that is hollow inside and has an open upper surface, and has a size capable of storing an appropriate amount of water W (for example, 0.8 tons of water). Is formed in. A water supply pipe 3a for supplying new groundwater supplied from the groundwater supply device 3 (see FIG. 1) into the glass eel farming tank 10 is provided on the upper side surface of the glass eel farming tank 10. Further, a drainage pipe 26 extending in the vertical direction is provided at the bottom of the glass eel farming tank 10. The upper end of the drainage pipe 26 is located slightly lower than the edge of the upper surface of the glass eel farming water tank 10, and a hole 27 penetrating the bottom surface of the glass eel farming water tank 10 is provided from the upper end. When the amount of water W stored in the glass eel farming tank 10 exceeds a certain amount, the water W overflows and flows into the hole 27 of the drainage pipe 26, and is drained to the drainage device 5 (see FIG. 1).

As shown in FIG. 2 (A), the filtration device 11 has a width similar to or slightly larger than the width of the glass eel farming tank 10, and is in the shape of a horizontally long cubic container having a depth shorter than that of the glass eel farming tank 10. The upper surface is released with. The filtration device 11 is divided into regions by partitioning portions 15 (15a, 15b) so that six equally sized sections are arranged side by side. The partition portion 15 has an upper partition portion 15a that partitions from the vicinity of the upper surface of the filtration device 11 to a position slightly distant from the bottom surface to form a flow path 15c downward, and a position slightly distant from the water surface located above the filtration device 11. A total of five lower partition portions 15b, which partition from the bottom surface to the bottom surface and form a flow path 15d below, are alternately arranged. Due to the upper partition 15a and the lower partition 15b, the water storage space of the water W in the filtration device 11 is the first water storage unit 14a and the second water storage unit 14b in order from the upstream side (left in FIG. 2A) through which the water W flows. , 3rd water storage unit 14c, 4th water storage unit 14d, 5th water storage unit 14e, and 6th water storage unit 14f.

A filtration mat 12 made of a sponge is housed in the first water storage unit 14a so as to cover the surface of the water W. As a result, the water W that is sucked up from the inside of the glass eel farming water tank 10 by an appropriate pump and supplied from the water sucking port 11a is filtered.

In the second water storage unit 14b, the filtered wool 16 made of wool is housed so as to cover the surface of the water W. As a result, the water W supplied from the first water storage unit 14a through the lower flow path 15c is filtered.

In the third water storage section 14c, a coral sand filter 18 in which a large number of pieces of coral (coral sand) are packed in a net bag is housed so as to fill up to the vicinity of the water surface of the third water storage section 14c. .. As a result, the water W supplied from the second storage unit 14b through the upper flow path 15d is filtered.

In the fourth water storage unit 14d, a ceramic filter 19 in which a large number of cylindrical pipe-shaped ceramic filter media are packed in a net bag is housed so as to fill up to the vicinity of the water surface of the fourth water storage unit 14d. ing. As a result, the water W supplied from the third storage unit 14c through the lower flow path 15c is filtered.

In the fifth water storage unit 14e, a ceramic filter 22 in which a large number of cylindrical pipe-shaped ceramic filter media are packed in a net bag is housed so as to fill up to the vicinity of the water surface of the fifth water storage unit 14e. ing. As a result, the water W supplied from the fourth storage unit 14d through the upper flow path 15d is filtered.

The sixth water storage unit 14f is provided with a cylindrical drainage pipe 23 penetrating the bottom surface. The drainage pipe 23 is formed so that the upper end is located near the water surface of the sixth water storage portion 14f. As a result, when the water W in the sixth water storage unit 14f increases, the water W overflows into the drain pipe 23, passes through the hole 24 of the drain pipe 23, and is supplied to the glass eel farming water tank 10.

With this configuration, the groundwater (water W) supplied from the water supply pipe 3a into the glass eel farming tank 10 is stored in the glass eel farming tank 10. The water W in the glass eel farming tank 10 is sucked up by a pump (not shown) and supplied from the water suction port 11a to the first water storage unit 14a of the filtration device 11, and the second water storage unit 14b, the third water storage unit 14c, and the third water storage unit 14c. 4 The water storage unit 14d, the fifth water storage unit 14e, and the sixth water storage unit 14f flow in this order. Meanwhile, the water W is filtered by sequentially passing through the filtration mat 12, the filtration wool 16, the coral sand filter 18, the ceramic filter 19, and the ceramic filter 22. The water W filtered in this way is supplied to the glass eel farming aquarium 10 again.

In the glass eel farming tank 10, fresh groundwater is supplied from the water supply pipe 3a and the overflowed water W is drained from the drainage pipe 26 by observing the state of the glass eels being bred. In this way, glass eels can spend time in clean water.

3A and 3B are explanatory views illustrating the configurations of the black eel farming aquarium 20 and the filtration device 11, FIG. 3A is a front vertical sectional view, and FIG. 3B is a right side vertical sectional view.

The black eel farming aquarium 20 has a rectangular parallelepiped container shape that is hollow inside and has an open upper surface, and is formed in a size capable of storing an appropriate amount of water W (for example, 1 ton of water). As shown in FIG. 3B, a water supply pipe 3a for supplying new groundwater supplied from the groundwater supply device 3 (see FIG. 1) into the black eel farming tank 20 is provided on the upper side surface of the black eel farming tank 20. Has been done.

Further, a drainage unit 29 is provided in the vicinity of the side surface inside the black eel farming aquarium 20. The drainage unit 29 is composed of a cylindrical main body portion 29b extending vertically, a mesh portion 29c formed in a cylindrical shape by a wire net below the cylindrical main body portion 29b to the same diameter, and the mesh portion 29c. A bottom cover 29d that closes the bottom surface, a mesh cover portion 29a that is formed in a disk shape by a wire net that covers the upper surface of the cylindrical main body portion 29b, and a black eel farming tank 20 that extends horizontally from the side surface of the cylindrical main body portion 29b. It has a drainage pipe 29e protruding from the side surface to the outside. In the drainage unit 29, the mesh cover portion 29a and the mesh portion 29c are made of a non-rusting material such as stainless steel and are formed of a mesh having a size that allows black eels to not pass through, and other parts are made of plastic.

In the drainage unit 29, the internal space of the cylindrical main body 29b and the internal space of the drainage pipe 29e communicate with each other, and the water W flowing in from the mesh cover portion 29a or the mesh portion 29c flows from the inside of the cylindrical main body 29b to the drainage pipe 29e. It is drained to the external drainage device 5 (see FIG. 1) of the black eel farming tank 20 through the inside.

The size of the drainage unit 29 is such that the bottom cover 29d is located near the bottom surface of the black eel farming tank 20 and the mesh cover portion 29a is located slightly higher than the water surface of the water W in the black eel farming tank 20. ing. As a result, the dirty water normally near the bottom of the black eel farming aquarium 20 can be drained from the mesh portion 29c, and when the water W overflows, the water W can be drained from the mesh cover portion 29a.

A filtration device 11 is provided above the black eel farming aquarium 20. Since this filtration device 11 has the same configuration as the filtration device 11 provided in the upper part of the glass eel farming aquarium 10, the same elements are designated by the same reference numerals and detailed description thereof will be omitted. The filtration device 11 is the same as the one used for the glass eel farming tank 10 and the one used for the black eel farming tank 20, but the configuration is not limited to this and may be appropriately different.

FIG. 4 is a front longitudinal view illustrating the configurations of the size-based adult eel aquaculture tank 30 and the filtration device 31. The size-based adult eel farming tank (size 1) 30A to the size-based growing eel farming tank (size 5) 30E and the respective filtration devices 31A to 31E all have the same size and the same configuration as shown in FIG. Therefore, the size-specific adult eel aquaculture tank 30 and the filtration device 31 will be collectively described.

As shown in FIG. 4, the size-specific adult eel aquaculture tank 30 has a rectangular parallelepiped container shape that is hollow inside and has an open upper surface, and is formed in a size capable of storing an appropriate amount of water W (for example, 1 ton of water). Has been done. A water supply pipe 3a for supplying new groundwater supplied from the groundwater supply device 3 (see FIG. 1) into the size-specific adult eel culture tank 30 is provided on the upper side surface of the size-specific adult eel culture tank 30.

In addition, a drainage unit 29 is provided in the vicinity of the side surface inside the eel farming tank 30 according to size. Since the drainage unit 29 is the same as that provided in the black eel farming aquarium 20, the same elements are designated by the same reference numerals and detailed description thereof will be omitted.

The filtration device 31 has a tubular drainage pipe 35, a rectangular parallelepiped cage portion 34 connected to one end of the drainage pipe 35, and a suction bag 33 that covers the cage portion 34. The basket portion 34 is composed of a basket formed in a net shape as a whole. The suction bag 33 is formed in a bag shape having a size that can be put on the basket portion 34 by the non-woven fabric. The drainage pipe 35 is provided with a pump (not shown) inside, and the water W that has passed through the suction bag 33 and has flowed into the cage 34 is discharged to the other end of the drainage pipe 35. As a result, the water W in the size-specific adult aquaculture tank 30 can be sucked in, and at that time, dust (food residue, feces, etc.) floating in the water W is adsorbed on the surface of the adsorption bag 33. .. Further, the filtration device 31 is arranged in the water W in the size-based adult eel aquaculture tank 30, and floats in the water W at a height near the water surface W. Therefore, the dust can be adsorbed at each position while the position of the filtration device 31 changes.

FIG. 5 is a front longitudinal view illustrating the configurations of the large eel aquaculture tank 40 and the filtration device 41.
The large eel aquaculture tank 40 has a cylindrical shape with one end as the bottom, and has a diameter longer in the radial direction with respect to the height in the axial direction. This large-sized adult eel farming tank 40 is 10 times or 20 times larger than the size-specific grown eel farming tank 30 so that a large amount of water W (for example, 10 tons or 20 tons) can be stored. It is formed larger than any of the black eel farming tank 20 and the size-specific adult eel farming tank 30.

The large eel aquaculture tank 40 is provided with a water supply pipe 3a for supplying new groundwater supplied from the groundwater supply device 3 (see FIG. 1) into the large eel aquaculture tank 40. Further, a drainage pipe 49 extending in the vertical direction is provided at the bottom of the large eel aquaculture tank 40. The upper end of the drainage pipe 49 is located slightly lower than the edge of the upper surface of the large eel aquaculture tank 40, and a hole (not shown) penetrating the bottom surface of the large eel aquaculture tank 40 from the upper end is provided inside. ing. When the amount of water W stored in the large adult aquaculture tank 40 exceeds a certain amount, the water W overflows and flows into the hole of the drain pipe 49, and is drained to the drain device 5 (see FIG. 1).

Further, on the side peripheral surface of the large aquaculture tank 40, a drainage pipe 51 for draining the water W stored in the large aquaculture tank 40 to the upper unit 54 of the aeration tank 50 and a lower unit of the aeration tank 50 A water supply pipe 52 for supplying water W after filtration from 55 to the large aquaculture tank 40 is provided.

The aeration tank 50 is a tank in which water and air are brought into contact with each other to send air into the water. The water W flowing from the large eel aquaculture tank 40 is aerated by the aeration tank 50 and flows out to the nitrification tank 60 through the flow path 56 and the flow path 61 by the circulation pump 58.

The nitrification tank 60 has a cylindrical shape with a bottom and has a container shape for storing water W inside. The nitrification tank 60 is provided with an aeration pipe 63 inside. The aeration diffuser tube 63 is formed in a ring shape having a size slightly smaller than the circular bottom. The aeration diffuser pipe 63 sends air into the water W. Further, in the nitrification tank 60, a plurality of flow filter media 65 are charged. The flow filter medium 65 is formed by microfiber in a shape provided with a partition plate having a cross section in the radial direction inside the cylinder. The flow filter medium 65 has a property of adsorbing bacteria. By the action of this bacterium, harmful ammonia is converted to nitrite or nitric acid. It is preferable that the flow filter medium 65 is irradiated with far infrared rays by an appropriate far infrared irradiation device. This promotes the decomposition of ammonia by bacteria.

Further, the nitrification tank 60 is provided with a drainage pipe 67. The water W in the nitrification tank 60 is supplied to the denitrification tank 70 by the drainage pipe 67.

The denitrification tank 70 has a cylindrical shape with a bottom and has a container shape for storing water W inside. The denitrification tank 70 is provided with an aeration pipe 73 inside. The aeration diffuser tube 73 is formed in a ring shape having a size slightly smaller than the circular bottom. The aeration diffuser pipe 73 sends air into the water W. Further, a plurality of flow filter media 75 are put into the denitrification tank 73. The flow filter medium 75 is formed by microfiber in a shape provided with a partition plate having a cross section in the radial direction inside the cylinder. The flow filter medium 75 has a property of adsorbing bacteria. By the action of this bacterium, harmful nitric acid is decomposed into harmless nitrogen and water. It is preferable that the flow filter medium 75 is irradiated with far infrared rays by an appropriate far infrared irradiation device. This promotes the decomposition of nitric acid and nitrite by bacteria.

Further, the denitrification tank 70 is provided with a stirring propeller 71. The stirring propeller 1 is rotated by a drive motor (not shown) to stir the stored water.

Further, the denitrification tank 70 is provided with an organic material replenishment 78 used for replenishing the organic material.

A drainage pipe 83 that supplies the water flowing out of the denitrification tank 70 to the nanobubble generator 80 is connected to the downstream of the denitrification tank 70.

The nanobubble generator 80 is a nanobubble generator in which water is stored in the active tank and generates nanobubbles which are bubbles having a diameter of several hundred nm or less so as to be immersed in the water in the active tank. An activator that activates water is provided. The activator is composed of an appropriate carrier that immobilizes and propagates microorganisms, such as a polychlorinated biphenyl filler or activated carbon. As a result, the nanobubble generator 80 can generate nanobubbles and activate water. The nanobubble generator 80 may be a micro-nano bubble generator using a micro-nano bubble generator that generates micro-nano bubbles (micro bubbles and nano bubbles) of about 10 μm to several hundred nm.

The water containing and activated with nanobubbles is supplied to the aeration tank 50 arranged in the subsequent stage by the drainage pipe 53.

In the aeration tank 50, by bringing the water into contact with air, the water is returned to the large eel farming tank 40 in a state where oxygen is further supplied to the water.

The filtration device 41 is composed of the aeration tank 50, the nitrification tank 60, the denitrification tank 70, and the nanobubble generator 80.

FIG. 6 is a flowchart illustrating a flow of an eel farming method for culturing eels by the eel farming system 1.

First, the received glass eel is released into the glass eel farming tank 10 (see FIG. 2) and bred in the glass eel farming tank 10 (step S1). In the breeding of the glass eels in the glass eel farming tank 10, the state of the glass eels is checked and flushed (water is flowed in and the same amount of water as the flowed water is discharged from the glass eel farming tank 10), and filtration is constantly performed by the filtration device 11. .. At this stage of glass eels, the first food is the food of biological systems such as plankton. The food for this organism can be live, dead, or a mixture of these. In addition, the biological food may be one type or a plurality of types. When using multiple types, it is advisable to feed the smaller one when the glass eel is small, and to feed the larger one after the glass eel has grown a little. Specifically, feed the smaller biological system for about 2 weeks from the beginning, and then change the food to the next larger biological system over 2 weeks while changing the ratio, and from the above switching Switch completely in about a month. Furthermore, after one month has passed, gradually switch to the paste.

Until the glass eel grows into a black eel (step S2: No), the breeding in the glass eel farming tank 10 described above is continued. The breeding period in the glass eel farming tank 10 is about 3 months for the glass eel.
When the glass eel grows into a black eel (step S2: Yes), the water in the glass eel farming tank 10 is partially drained and reduced, the black eel is transferred to the black eel farming tank 20 (see FIG. 3), and the black eel farming tank 20 is used. Switch to aquaculture (step S3). In the breeding of the black eel in the aquaculture tank 20, the state of the black eel is observed and the water is poured, and the filtration device 11 constantly filters the fish. At this stage of black eel, it is fed as food.

Until the black eel grows and becomes an eel (step S4: No), the breeding in the black eel farming tank 20 described above is continued. The breeding period in the black eel farming aquarium 20 is about 3 months for the black eel.
When the black eel grows to become adult eels (step S4: Yes), the water in the black eel farming tank 20 is partially drained and reduced, and the grown eels are grown to the minimum size in the size-based adult eel farming tank 30 (see FIG. Transfer to size-based adult eel farming aquarium (size 1) 30A for eel breeding, and switch to breeding in size-based adult eel farming aquarium 30 (step S5). In the breeding of eels by size in the aquaculture tank 30, the state of the eels is checked and the eels are flushed, and the filtration device 31 constantly filters the eels. At this stage of adult eel, the bait is fed as food.

Until the sorting timing is reached (step S6: No), breeding is continued in the size-based adult eel farming aquarium 30, and when the sorting timing is reached (step S6: Yes), the water in the size-based adult eel farming tank 30 is reduced to grow eels. Are sorted according to size (step S7), and are bred by classifying them into five aquariums, size-based adult eel farming tank (size 1) 30A to size-based adult eel farming tank (size 5) 30E. The number of size-specific adult eel aquaculture tanks 30 is not limited to five, but may be three, and the number may be appropriate so that the size can be divided. The total period of breeding for each size in the plurality of size-specific adult eel aquaculture tanks 30 is about 3 to 6 months for adult eels.

When the breeding eel grows to a size suitable for being placed in the large eel aquaculture tank 50 (step S8: Yes), the water in the size-specific eel aquaculture tank (size 5) 30E is partially drained and reduced. , The grown eel grown to that size is transferred to the large-sized adult eel aquaculture tank 50, and the breeding is switched to the large-sized adult eel farming tank 50 (step S9). In breeding in the large adult aquarium 50, aeration by the aeration tank 50, decomposition and aeration of ammonia by the nitrification tank 60, decomposition and aeration of nitric acid and nitrite by the denitrification tank 70, supply and activity of nanobubbles by the nanobubble generator 80. To change. As a result, the glass eel farming tank 10, the black eel farming tank 20, and the size-specific adult eel farming tank 30 can be cultivated for a longer period of time without changing the water.

That is, the large-sized adult eel farming tank 40 is configured to be 5 times or more, preferably 10 times or more the size of each of the glass eel farming tank 10, the black eel farming tank 20, and the size-specific adult eel farming tank 30. It is also difficult to drain water. By increasing the degree of filtration in the large-sized large-scale eel aquaculture tank 40 in this way, the aquaculture work is facilitated.

Until the grown eels in the large-sized adult eel farming tank 40 are ready for shipment (step S10: No), the breeding in the large-sized grown-up eel farming tank 40 described above is continued.
When the adult eel grows to the ready-to-ship state (step S10: Yes), the adult eel that has become ready to be shipped is taken out from the large-sized adult eel aquaculture tank 40 according to the number of orders and shipped (step S11).

With the above configuration and method, eels can be cultivated with good yield. In detail, in the conventional eel farming, some eels died by the time the glass eels were received, bred and shipped as adult eels, which was reduced to 40% to 50% of the original quantity. .. On the other hand, by breeding the eels by the method described above using the eel farming system 1, at least 70% of the original quantity of eels, and on average 75% of the eels can be grown into adult eels and shipped. it can.

Since biological food is used in some steps in breeding, the residue of food is less likely to remain as compared with the paste, and the cleanliness of water can be improved. In particular, the use of biological food in the glass eel farming process can reduce the mortality rate of the weakest and most mortal glass eels.

In addition, the aquariums are divided according to the growth stage, and only eels of similar size are bred in each aquarium, so large-grown eels eat too much food and small eels do not eat much food. Can be prevented. As a result, it is possible to prevent small eels from being unable to eat food and remaining small and growing slowly, and all eels can grow on average.

In addition, glass eel aquarium 10, black eel aquarium 20, size-specific adult eel aquarium (size 1) 30A, size-specific adult eel aquarium (size 2) 30B, size-specific adult eel aquarium (size 3) 30C, size-specific An adult aquarium (size 4) 30D, a size-specific aquarium (size 5) 30E, and a large aquarium 40 are provided independently, and ground water is supplied from the groundwater supply device 3 to each of these aquariums. It is directly supplied individually, and filtration devices 11, 11, 31A, 31B, 31C, 31D, 31E, 41 are also provided independently for each aquarium. Therefore, the water in each aquarium does not mix with each other, and an independent breeding environment can be realized for each aquarium. As a result, for example, even if a disease occurs in a certain aquarium, it is only affected by that aquarium, and it is possible to prevent the disease from being transmitted to the eels of other aquariums. In other words, even if a disease that leads to the annihilation of eels occurs, or a situation in which staphylococci that lead to the annihilation of eels occur, only the aquarium is annihilated, and the eels in the entire aquarium are annihilated. Never. Therefore, the damage when a problem occurs can be minimized.

Further, only the large eel aquaculture tank 40 is provided with the nitrification tank 60, the denitrification tank 70, and the nanobubble generator 80. As a result, the large-sized down feather aquaculture tank 40, which is difficult to replace water, keeps the water clean by taking advantage of the action of bacteria, and the other aquaculture tanks use cheaper filtration guns, which reduces the cost of equipment. It is possible to solve the conflicting problems of improving the yield of eels.

Further, by changing the configuration of the filtration devices 11, 31, and 41 for each water tank according to the growth stage of the eel, appropriate filtration can be performed without incurring an unnecessarily high cost.

Further, in the filtration devices 11, 21, 31A, 31B, 31C, 31D, 31E, 41, bacteria were utilized by using ceramic filters 19, 22 and fluid filter media 65, 75 using appropriate filter media. Water can be filtered, ammonia and the like can be decomposed, and eels can be bred in clean water.

Further, by using the nanobubble generator 80 that supplies nanobubbles and activates water, it is possible to improve the bite of eel food, promote the growth of eels, and maintain health.

In addition, by controlling the temperature, the temperature of the aquaculture aquarium (10, 20, 30A, 30B, 30C, 30D, 30E, 40) can be kept constant, and the eel's food bites well for breeding. You can grow eels in the optimal environment.

The present invention is not limited to this embodiment and can be various other embodiments.
For example, the nitrification tank 60 and the denitrification tank 70 are configured separately, but the present invention is not limited to this, and a nitrification denitrification tank in which one tank has the functions of nitrification and denitrification may be used. In this case as well, the same effect can be obtained.

Further, the filtration device 11 may be installed in the size-specific adult eel aquaculture tank 30, and the filtration device 11 may be used while the size of the adult eel is managed. In this case, the water can be filtered more effectively.

In addition, the temperature was adjusted by indoor air conditioning, but not limited to this, the aquaculture aquarium (10, 20, 30A, 30B, 30C, 30D, 30E, 40) is equipped with a temperature control device such as a heater. The temperature may be controlled separately. Even in this case, it is possible to maintain an appropriate temperature and promote the growth of eel.

In addition, five size-specific adult eel farming tanks 30 (30A to 30E) are provided to breed adult eels until they grow to a size close to shipment, but the configuration is not limited to this, but four stages. It may be bred according to the size of 3 to 5 stages, such as 3 stages. Even in this case, it is possible to prevent only the grown eels from eating food and growing, and the small eels from not growing forever, and to grow equally.

The present invention can be used for eel farming.

1 ... Eel culture system 3 ... Ground water supply device 10 ... Glass eel aquarium 10, 20, 30A, 30B, 30C, 30D, 30E, 40 ... Culture tank 11,21,31A, 31B, 31C, 31D, 31E, 41 ... Filtration Device 12 ... Filtration mat 16 ... Filtration wool 18 ... Coral sand filter 19, 22 ... Ceramic filter 20 ... Black eel culture aquarium 30 (30A-30E) ... Size-specific adult eel culture aquarium 33 ... Adsorption bag 40 ... Large adult eel Culture water tank 60 ... Filtration tank 70 ... Denitrification tank 80 ... Nano bubble generator

Claims (3)

Multiple aquaculture tanks that store water,
Water supply means to supply water to each aquaculture tank,
A filtration device for filtering the water is provided.
The aquaculture aquarium
A glass eel farming aquarium for cultivating glass eels,
A black eel farming aquarium for cultivating black eels,
A separate aquaculture tank for eels is provided to cultivate eels.
The filtration device, the glass eel aquaculture water tank is provided in each of the Kurokounagi aquaculture water tank, and the Naruunagi aquaculture water tank,
The adult eel aquaculture tank has at least three size-specific adult eel aquaculture tanks that are divided and cultivated in at least three stages according to the size of the growing eel.
The size-specific adult eel aquaculture tank is provided with an adsorption bag made of non-woven fabric and a pump for supplying water inside the suction bag as the filtration device.
An eel farming system in which the pump supplies water to attach dust to the surface of the adsorption bag, which is a non-woven fabric . Said Naruunagi aquaculture aquarium,
Eel aquaculture system according to claim 1 having a large Naruunagi farming aquariums for farming Naruunagi grown to a Jo Tokoro magnitude. The glass eel farming aquarium
As the filtration device, a filtration mat made of sponge, a filtration wool made of wool, a coral sand filter in which a large number of pieces of coral (coral sand) are packed in a net bag, and a cylindrical pipe-shaped filter device. Equipped with at least one of the ceramic filters in which a large number of ceramic filter media are packed in a net bag.
The large eel aquaculture tank
The eel cultivation system according to claim 2, further comprising a nitrification tank for decomposing ammonia, a denitrification tank for decomposing nitric acid and nitrite, and a nanobubble generator for generating nanobubbles.

Images