JPH0851887A - Breeding of saltwater fishes and device therefor - Google Patents

Abstract

PURPOSE:To provide a method for breeding saltwater fishes and a device therefor capable of easily observing whole aquarium and reducing total costs and good in recycling efficiency. CONSTITUTION:This method for breeding saltwater fishes and a device therefor comprises providing plural aquariums A1, A2, A3 in a single stage in parallel and a recycling filtering device B for filtering water separately from the aquariums, connecting recycling water supplying pipes 9, 11a, 11b, 16a, 16b, 15a and 15b connected consecutively to the aquariums, to the recycling filtering device B through recycling pumps 10a, 10b, connecting disinfecting devices 14a, 14b to the outlet side of water supplying pipes of the recycling pumps and connecting branched pipes 17a, 17b branched from the recycling water supplying pipes 15a, 15b consecutively to the lower parts of filtering materials 3a, 3b, 3c of the aquariums, and providing reverse washing pipes 19a, 19b, 19c capable of draining dirty water surfacing in aquariums by reverse washing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breeding method and apparatus for breeding saltwater fish.

[0002]

2. Description of the Related Art In recent years, the marine aquarium has been calling for a quiet boom, but it is because the fish swim feels a sense of comfort and lengthy openness. In this way, the appreciation fish has come to be used not only for pets but also as one of the interiors because the vividness of colors and the subtleties of movement create a unique atmosphere. Compared with freshwater fish, saltwater fish have a colorfulness of primary colors and their movements are extremely agile and active,
It is extremely popular for ornamental use. Therefore, the demand for saltwater fish is increasing more and more.

[0003] Ordinarily, ornamental saltwater fishes need to be temporarily housed in an aquarium at a trader in order to respond to an elastic supply system at the distribution stage. The breeding of saltwater fish at such a distribution stage must be carried out efficiently and well. By the way, since saltwater fish generally grow an environment in water containing salt, it has a drawback that the amount of dissolved oxygen is small and bacteria that dislike oxygen easily propagate. When a bacterium that dislikes oxygen, that is, an anaerobic bacterium, is generated in this way, it becomes easy to change the spoilage and the like formed by the excrement of fish generated during rearing into highly toxic sulfide.

From the above, it is necessary to suppress the generation of anaerobic bacteria as much as possible in order to breed saltwater fish, but in order to do so, it is necessary to manage the water quality of the aquarium, the water temperature, etc. This is troublesome. Therefore, the current mainstream method for breeding saltwater fish is to use an aquarium having a separate filtration device outside. When a large amount of water is temporarily raised by a trader at the distribution stage, a number of relatively small aquariums are placed side by side on the floor, and an external filtration device provided for each aquarium filters each aquarium. Be seen.

The use of individual relatively small aquariums is for the purpose of responding to each type of fish and for preventing infection in the event of an illness. However, such a method has various drawbacks such as a large number of filtration devices and a high cost. Therefore, as a result of diligent research, the inventors have found that it is possible to save labor by stacking a plurality of water tanks in multiple stages, and the water in each of the multiple stacked water tanks is dropped into the corresponding water tank in the lower stage, and We have developed a method and device for raising fish by circulating water between each tank at the bottom and each tank at the top through a filtration device (this technology has already been applied for).

[0006] However, in the vertical stacking system in which the respective aquariums are stacked in multiple stages, the field of view is limited when the fish are viewed from the side, and although it is good only for ornamental purposes in ordinary households, it is bred for this type of trader. Therefore, when managing the entire aquarium, good observation is not always possible from the side only, and if the aquariums are stacked in multiple stages, it is necessary to reinforce with a framework from the viewpoint of safety, and the aquarium and the frame that supports it are large. Due to the necessity of forming a pump and raising the head of the pump to be used, there have been various drawbacks such as an increase in pump output and poor circulation efficiency, resulting in an increase in cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a method and apparatus for breeding saltwater fish, which makes it easy to monitor and observe the entire aquarium, has good circulation efficiency, and reduces total cost. The purpose is to provide.

[0008]

However, as a result of intensive research conducted by the present inventors to solve such a problem,
By arranging the water tank in a single stage, it was found that the entire water tank can be observed, the reinforcing frame of the water tank itself is not necessary, and the capacity of the pump can be reduced, and the present invention has been completed based on this finding. It is a thing.

That is, the present invention is a method for circulating and filtering the water in each of a plurality of aquariums arranged in parallel in a single stage using a single circulatory filtration device, in which the water in each aquarium is cultivated. The method lies in the method of rearing saltwater fish, which is sent to a circulation filtration device, filtered, and then returned to each aquarium.

[0010] Then, there exists a method for rearing saltwater fish which is sterilized after being filtered. Further, a saltwater fish breeding apparatus comprising a plurality of water tanks arranged in parallel in a single stage and one circulation filtration device, the first circulation water pipe for sending the water of each water tank to the circulation filtration device, Second for returning the water from the circulation filter to each tank
It exists in a saltwater fish breeding device consisting of a circulating water pipe.

Further, the present invention resides in a saltwater fish filtration device provided with a sterilizing device in the second circulating water pipe. Further, it also exists in a saltwater fish breeding apparatus in which the water tank is a water tank having a bottom filtration mechanism. Also, in order to backwash the filtration material of the bottom filtration mechanism of the aquarium, a branch pipe for sending the water filtered by the circulation filtration device and a backwashing for draining the water in the aquarium after the backwashing. It exists in a saltwater fish breeding device equipped with a tube.

[0012]

The water filtered in each of the plurality of water tanks arranged side by side in a single stage is further filtered by the circulation filtration device. After that, it is returned to each aquarium, and as a whole, efficient breeding of saltwater fish is performed.

[0013]

Embodiments Embodiments will be described below with reference to the drawings. FIG.
FIG. 1 is a conceptual diagram showing a flow sheet of an aquarium device for breeding saltwater fish that is an example of the present invention. As shown in FIG. 1, a plurality of water tanks A are arranged side by side in a single step on the floor surface. That is, among the water tanks A arranged in parallel, a specific water tank A1 is provided with a filtration tank B adjacent thereto, and a large number of water tanks other than the water tank A1 (only A1, A2, A3 are shown in the figure). Are arranged side by side, and many water tanks are also arranged side by side, although not shown. Each aquarium has a set of tropical fish, which can be overlooked from above and can be closely monitored and observed at all times.

Then, the water tanks A1, A2, A3 arranged side by side
As described later, the water is sent to the circulation filtration device via the first circulation water pipe, is filtered by the circulation filtration device, and the filtered water is again filtered through the second circulation water pipe to each water tank. It is returned to A1, A2, A3. In this case, the circulation filtration device is composed of a filtration tank B, a bottom filtration mechanism provided at the bottom of the filtration tank B, which will be described later, and a sprinkler 6. That is, as the water tanks A1, A2, and A3, water tanks having an overflow-type bottom filtration function are used, as described later.

Each of the overflow type water tanks A1, A
2, A3 are provided with falling water pipes 5a, 5b, 5c for overflowing the water in the water tank.
A circulation water supply pipe 9 which is a first circulation water supply pipe is connected to each of 5b and 5c, and an end portion of the circulation water supply pipe 9 is connected to a sprinkler device 6 provided at an upper portion of the filtration tank B. ing. In addition, this water sprinkler 6 is similar to other water tanks in the water tank A.
In No. 1, since it is set at a position slightly lower than the top Q1 of the falling water pipe 5a, it falls naturally due to the drop, and water can be sprayed without using a pump.

Further, circulating water pipes 11a and 11b are connected to the filtering tank B so as to communicate with the bottom space P2 of the filtering material 8 laid in the filtering tank B, and these circulating water pipes 11 are connected.
An on-off valve (hereinafter simply referred to as a valve) 12a is provided on each of a and 11b.
Circulation pumps 10a and 10b are respectively connected via 12b. Furthermore, the circulation pumps 10a, 10b
To the sterilizers 14a and 14b via valves 13a and 13b.
, And circulating water pipes 15a and 15b are extended to the sterilizers 14a and 14b, respectively.

One of the extended circulating water supply pipes 15a is branched to face the discharge port above the filtration tank B and the water tanks A1 and A2 through valves V1, V2 and V3, and the other. The circulation water supply pipe 15b faces the discharge port to the upper part of the water tank A3 and the other water tank (not shown) via the valve V4 and the valve (not shown). As described above, the water filtered by the filtering tank B is circulated by the circulation pumps 10a, 10b as the second circulation water pipes 11a, 11
It is returned to each aquarium via b, 16a, 16b, 15a and 15b.

On the other hand, circulating water pipes 16a, 1 connecting the respective circulation pumps 10a, 10b and the sterilizers 14a, 14b.
6b, the branch pipes 17a and 17b are connected to the valves 18a and
One branch pipe 17a is connected to the bottom space P of the water tanks A1 and A2 via valves U1 and U2, and the other branch pipe 17b is connected to the bottom space P of the water tank A3 or not shown. It is also connected to the bottom space of other water tanks via a valve U3 or another valve (not shown).
Further, in the bottom space P of each water tank, each of the valves U1, U
2, openings U1X, U2X and U3 communicating with U3
X is formed.

Then, in each of the water tanks A1, A2, A3, the bottom filter materials 3a, 3 are formed by so-called backwashing described later.
Backwash pipes 19a, 19b, 19c are provided upright for discharging putrefaction materials such as feed and excrement floating from b and 3c to the outside through valves 20a, 20b, 20c. Further, in the bottom space P of the filtration tank B and the water tanks A1, A2, and A3, drainage valves 27a, 27b, and 27c, respectively.
And 27d are connected and these valves 27a, 27d
openings 27aX, 2 communicating with b, 27c and 27d
7bX, 27cX and 27dX are formed.

Further, a seawater supply pipe 21 having a valve 28 at its discharge port for appropriately supplying seawater is provided at the upper part of the filtration tank B, and seawater or artificial seawater is supplied from this seawater supply pipe 21 at any time. It can be supplied directly. In this case, the water pipe 2 is placed in the bottom space P2 of the filtration tank B.
2 is connected to the water supply pipe 22, and a cooling device 24 is connected to the water supply pipe 22 via a water supply pump 23 having valves 26a and 26b arranged at the front and rear.

A water supply pipe 25 is extended to the cooling device 24, and the respective outlets branched from the water supply pipe 25 are passed through valves 30a, 30b, 30c and 30d to pass a filtration tank B and water tanks A1 and A2. , A3 and other water tanks (not shown). That is, this cooling device 24 is used to prevent the water temperature in the water tank or the filtration device from rising and maintain it at an appropriate temperature when breeding saltwater fish in a high tropical region.

Next, the structure of the water tank A will be described with reference to a side sectional view of the water tank shown in FIG. 2 and a perspective view of the horizontal double continuous water tank shown in FIG. That is, FIG. 2 is an enlarged view of an optimum overflow type water tank among the water tanks having a bottom filter used for the breeding apparatus, and the water tank A shown in FIG.
The side view of the third tank A3 is shown in FIG.
It is a perspective view of the 3rd and 4th water tanks from the right.

The water tank A3 is, for example, a rectangular parallelepiped having four surfaces,
It is also possible to use a transparent side plate made of glass or acrylic such as plastic so that the saltwater fish inside can be seen from four sides. However, in this embodiment, a plurality of aquariums are used. Since they are arranged side by side in a single stage and can be observed from above, a slightly opaque one formed of integral FRP (reinforced fiber plastic) is also used.

At the bottom of the water tank A3, the punch plate 1 is on the bottom surface A.
It is installed at a certain distance from T (the upper surface of the bottom plate) and forms a raised bottom, but the distance from this bottom surface is
Usually, a range of 20 to 50 mm is often adopted. The punch plate 1 is formed by forming a flat plate into a rectangular shape, and has support frames 31a and 31b projecting around the inside of the water tank a predetermined distance above the bottom of the water tank.
The punch plate 1 is supported by the support frames 31a, 3
When supported by 1b, a bottom space P is formed between the bottom surface of the water tank and the punch plate 1.

The punch plate 1 is covered with a mesh sheet 2 made of metal or plastic having a mesh of about 2.5 mm, and the coral sand 3 containing a large amount of calcium is deposited on the mesh sheet 2. Has been done. In this way, the coral sand 3, the punch plate 1 and the mesh sheet 2 constitute a so-called bottom filtration mechanism in a water tank. It should be noted that this is the same in the other water tanks A1 and A2 as shown in FIG.
More obvious.

Here, the reason why coral sand is selected as the filter material is
This is because the coral sand has a large surface area and contains a large amount of calcium, and thus is most suitable for use in the present invention. As will be described later, it is considered that the coral sand 3 has a diameter of about 5 mm to 12 mm, is evenly spread to have a thickness of 30 to 50 mm, and the mesh sheet 2 is set to have meshes smaller than the coral sand 3. That is why it doesn't fall down.

The punch plate 1 is provided with small holes 1H having an inner diameter of about several millimeters at regular intervals by a design taking into consideration the normal circulation of water, and the coral sand is provided on the punched plate 1. Since 3 is placed, it has sufficient strength to withstand it. Further, the punch plate 1 has a role of forming a raised bottom to form a bottom space P at the bottom of the water tank A3, and also of freeing water flowing down through the coral sand 3 and the like downward.

On the other hand, the overflow frame 4 is provided at each corner of the water tanks A2 and A3 having the double horizontal horizontal structure shown in FIG. 3 and the water tank A1 integrally formed with the filtration tank B shown in FIG.
a, 4b, 4c are provided in which the falling water pipes 5a, 5
b, 5c are provided, but the falling pipes 5a, 5b, 5c thereof
Is bent halfway and is connected from the side plate AS of the water tank to the external circulating water supply pipe 9 shown in FIG. The water that has entered the bottom space P is the water tank A as shown by the arrow in FIG.
3 overflows from the bottom hole portion T of the overflow frame body 4c, rises again, and overflows from the top portion Q3 of the falling water pipe 5c and flows down.

Further, the water tank A3 of the overflow frame 4c
A plurality of oil film taking holes 32c for removing the oil film floating on the water surface W in each water tank are formed at the water surface position of.
The oil film passes through this hole 32c and overflow frame 4c
And then immediately flows down from the top Q3 of the falling water pipe 5c, and finally is sent to the filtration tank B via the water sprinkler 6 for purification. At the position opposite to the position where the overflow frame is located, each outlet of the circulation water supply pipe 15b is opened below the water surface, and the filtered new water is supplied to the water tank A3 one after another.

Next, the filtration tank B will be described. (A) and (b) shown in Drawing 4 are sectional views which expand and show a filtration tank B used for a breeding device. The filtration tank B is a water tank A1
In many cases, it is integrally molded by FRP so as to be arranged adjacent to the. The filtration tank B has a function of further filtering the water in each of the water tanks arranged in parallel in a single stage, and is usually installed adjacent to the end of a plurality of water tanks A1 arranged in parallel. . In this way, when a plurality of aquariums are installed side by side, the field of view to all aquariums is widened, and it is extremely convenient to view from a wide range when managing all aquariums for raising fish.

In this case, since the water tank A1 arranged adjacent to the filtration tank B has the same structure as the other water tanks described above, the same parts are designated by the reference numerals and the detailed description thereof will be omitted. Here, the filtration tank B is composed of a filtration tank plate 8A, a side plate AS, a punch plate 8C, a mesh sheet 8D, a coral sand filter material 8B, etc., and a punch plate 1 is provided at the bottom of the filtration tank B. Bottom AT
It is installed at a certain distance from the (top surface of the bottom plate) to form a raised bottom, but the distance from this bottom surface is
Usually, a range of 20 to 50 mm is often adopted.

That is, support frames 33a and 33b are formed on the inner peripheral surface of the filtration tank B at a predetermined distance above the bottom surface AT,
A punch plate 8C formed in a rectangular flat plate shape is detachably supported by the support frames 33a and 33b. And
When the punch plate 8C is supported by the support frames 33a and 33b, a bottom space P2 is formed between the bottom surface AT of the filtration tank B and the punch plate 8C. In this bottom space P2, the valve 27
An opening 27aX connected to a is provided.

Further, the punch plate 8C is provided with a fine hole in its entirety, and this fine hole is similar to the punch plate at the bottom of the water tank in consideration of the flow passage design considering the circulation efficiency of the entire apparatus. Is formed in. A metal or plastic net-like sheet 8D is laid on top of this, and then coral sand 8B
Are deposited to a thickness of about 50-80 mm. Coral sand 8
B is washed when necessary (about once a month), but in that case, by removing the punch plate 8C, it can be easily taken out and washed together with it.

In this case, the coral sand 3 has a diameter of 5 mm to 12 mm.
It is preferable that the thickness is about 30 mm, the thickness is 30 to 50 mm and the particles are evenly spread, and the mesh mesh of the mesh sheet 2 is set smaller than the coral sand 3. Then, the coral sand 8B efficiently carries out a biofiltration action that propagates aerobic bacteria and changes toxic substances. In the filtration tank B, since the coral sand 8B is below the water surface, it is placed in the same state as the coral sand deposited on the raised bottom in the water tank as described above. The excessive mode is almost the same as this.

The water that has passed through the coral sand 8B is punched by the punch plate 8C.
Through the small holes to reach the bottom space P2,
After reaching 2, the suction tank B is sucked by the pumping force of the circulation pump 10a through the suction port 8E of the circulation water supply pipe 11a, and is filtered from the discharge port branched from the circulation water supply pipe 15a further extended from the circulation pump 10a. And returned to the respective water tanks A1 and A2. That is, in FIG. 4, only the circulating water supply pipe 11a is shown, but in actuality, as shown in FIG.
The circulating water pipe 11a is connected in parallel to the bottom space P2 of the filtration tank B, and the water sucked by the pumping force of the circulation pump 10b passes through the circulating water pipe 15b to the water tank A3.
Then, it is branched and returned to another water tank (not shown).

By the way, the bottom filter material of each aquarium used in the present invention and the coral sand 8B of the filtering device have a grain size of 5
mm to 12 mm (the size here means the outer shape of the grain) is preferably adopted. Here, the reason why the grain size is preferably 5 mm to 12 mm is that it is possible to prevent clogging of the sandy matter and is easy to wash during washing. Since such coral sand has an extremely high filtration efficiency, it is possible to filter water in several aquariums at once in the same manner as in the present invention.

Now, referring to FIG. 2, a circulation mode in which water is circulated in the water tank A3 will be described. First, when the pump 10b shown in FIG. 1 is started together with the other pump 10a, the circulation of the water of the whole breeding system device starts, and the water in the aquarium A3 strokes the sand surface of the coral sand 3 at the bottom thereof. It passes through and evenly passes over the entire bottom surface, and flows into the bottom space P through the small holes 1H of the punch plate 1. Nitrogen compounds are decomposed by the aerobic bacteria propagated in the coral sand 3 in this process (biological filter action).

In the present invention, the ceramic filter having the function of improving PH is not used as the filter for the filtration tank because seawater having a stable PH (pH 7.8 to PH8) is directly used in the filtration tank. This is because 8.2) has been introduced. Next, the water that has flowed into the bottom space P is overflow frame 4c.
Goes out from the bottom hole T of the water tank and once rises to the top Q3 of the falling water pipe 5c.
From the water to the lower part of the filtration tank B, and is guided to the sprinkler 6 in the upper part of the filtration tank B together with the overflowed water of the other water tanks A1 and A2 which is inherited by the circulation water supply pipe 9 connected to the falling water pipe 5c. Then, aeration is performed by the shower ring of the water sprinkler 6, and the temperature is optimally adjusted by a heater sensor (not shown). The circulation process is as described above.

Further, as shown in FIG. 1, the steps of backwashing for washing the filter material are as follows. That is, the water discharged from the filtration tank B via the circulation pumps 10a, 10b (in this case, water that is not normally sterilized is used) is a branch pipe 17a branched from the front of the sterilizers 14a, 14b.
It is introduced into the bottom space P of each water tank A1, A2, A3 via 17b.

Therefore, when the water introduced into the bottom space P flows backward from the narrow holes 1H of the punch plate 1 through the coral sand gap as shown by the arrow in FIG. 4 (b), the inside of the coral sand Backwashing (flushing) to float the feed and excrement clogged in the back, and the floated feed and excrement are washed back with the backwash tubes 19a, 19b, 1
These backwash pipes 19a, 19b, 19c from the opening of 9c.
It flows in and is discharged to the outside. Next, a modified example of the filtration tank will be described with reference to FIG. The same components as those constituting the filtration tank B shown in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, this filtration tank BX is a filtration tank BX.
The inside of the container is partitioned by a partition plate 7A, and a retention chamber BX1 is separately provided. In this case, the filtration tank BX is the filtration tank plate 8
A, side plate AS, partition plate 7A, punch plate 8XC, reticulated sheet 8XD, coral sand filter material 8XB, and the like. At the bottom of this filtration tank BX, the punch plate 8XC is constant from the bottom surface AT (upper surface of the bottom plate). Although it is installed with a distance of, forming a raised bottom, the distance from this bottom surface is usually in the range of 20 to 50 mm.

In this way, the water sent from each water tank through the sprinkler 6 into the thus constituted filtration tank BX and having passed through the coral sand 8XB passes through the fine holes of the punch plate 8XC to the bottom space PX2. From this bottom space PX2, it flows into the retention chamber BX1 from the bottom hole TX of the partition plate 7A. The water retained therein is sucked through the suction port 8E of the circulation water supply pipe 11a by the pumping force of the circulation pump 10a, and is filtered from the discharge port branched from the circulation water supply pipe 15a further extended from the circulation pump 10a. It is returned to the excess tank B and the respective water tanks A1 and A2.

The filtration tank BX of this embodiment is the same as this filtration tank BX.
By partitioning the inside of the container with the partition plate 7A to form the retention chamber BX1, in each aquarium, for example, a drug for eliminating miscellaneous bacteria and parasites in the fish body, a drug such as a nutrient for development (tetravitale) Or, it is convenient because it can be easily charged from this retention chamber BX1 when supplying (tetramarine vital, etc.). Further, there is no restriction to set the suction port 8E of the circulating water supply pipe 11a to the position of the bottom space PX2 and near the bottom of the filtration tank, so that the connection position of the circulating water supply pipe 11a can be easily set by design.

Although the present invention has been described above, the effect of each embodiment is comprehensively described. Therefore, since it is possible to observe the entire aquarium, monitoring, observation and handling in terms of management for raising fish can be performed. It will be easy. In addition, each water tank is installed on the floor in a single stage, so there is no need for a framework such as fall prevention reinforcement as compared to the vertical stacking method, and it is possible to arrange (lay out) relatively freely according to the form of the floor. it can. Furthermore, since the pump used has a low height of the water tank, a pump with a low head is sufficient. Therefore, the pump capacity is lower than that of the vertical water tank, and the total cost can be reduced.

In addition to what has been described above, the present invention can be modified in various other ways without departing from the essence thereof. In that sense, the Examples are merely examples, and the present invention is not limited to these and limitedly interpreted. For example, the number of water tanks installed horizontally is
The number of the water tanks is not limited as long as the capacity of the filtration apparatus is suitable for it, and each water tank is an overflow type water tank, but water tanks of other types can be sufficiently adopted. Further, in the embodiment, the punch plate, the filter material and the like are numerically limited, but the present invention is not limited thereto.
Moreover, although it was intended for saltwater fish, it can also be applied to freshwater fish.

[0046]

EFFECTS OF THE INVENTION It is easy to monitor and observe the entire aquarium, the aquarium can be arranged freely, and it is possible to manage fish breeding extremely efficiently from the viewpoint of the circulation function. The cost reduction effect is also sufficient.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a flow sheet of an aquarium device for breeding saltwater fish, which is an embodiment of the present invention.

FIG. 2 is a side sectional view of an overflow type aquarium for breeding saltwater fish.

FIG. 3 is a perspective view of a horizontal double overflow type water tank.

FIG. 4 (a) is a side sectional view of an overflow type water tank showing a state of water flow when water overflows in a water tank integrally formed with a filtration tank, and FIG. 4 (b) is a water tank inside. FIG. 4 is a side sectional view of an overflow type water tank showing a state of water flow when it is backwashed with.

FIG. 5 is a side sectional view showing another embodiment of the filtration tank and showing a state in which the filtration tank is integrally formed with the overflow type water tank.

[Explanation of symbols]

 A1, A2, A3 ... Water tank AS ... Water plate AT ... Bottom surface B ... Filtration tank BX ... Filtration tank BX1 ... Retention chamber 1 ... Punch plate 2 ... Mesh sheet 3 ... Coral sand 4a, 4b, 4c ... Overflow frame body 5a, 5b 5c ... Water falling pipe 6 ... Sprinkler 7A ... Partition plate 8A ... Filtration tank plate 8B, 8XB ... Coral sand 8C, 8XC ... Punch plate 8D, 8XD ... Mesh sheet 8E ... Suction port 9 ... Circulation water pipe 10a, 10b ... Circulation Pump 11a, 11b ... Circulation water supply pipe 12a, 12b ... Valve 13a, 13b ... Valve 14a, 14b ... Sterilizer 15a, 15b ... Circulation water supply pipe 16a, 16b ... Circulation water supply pipe 17a, 17b ... Branch pipe 18a, 18b ... Valve 19a , 19b, 19c ... Backwash pipe 20a, 20b, 20c ... Valve 21 ... Seawater supply pipe 22 ... Water pipe 23 ... Water pump 24 ... Cooling device 25 ... Water pipe 26 , 26b ... Valves 27a, 27b, 27c, 27d ... Valves 27aX, 27bX ... Openings 28 ... Valves 30a, 30b, 30c, 30d ... Valves 31a, 31b ... Support frames 32a, 32b, 32c ... Oil film removing holes 33a, 33b ... Support frame 1H ... Fine hole J ... Connection part P, P2, PX2 ... Bottom space Q1, Q2, Q3 ... Top part T, TX ... Bottom hole part U1, U2, U3 ... Valve U1X, U2X, U3X ... Valve V1, V2, V3, V4 ... valve

Claims (7)

[Claims] 1. A method for breeding saltwater fish by circulating and filtering the water in a plurality of water tanks arranged in parallel in a single stage by using a single circulation filtration apparatus, wherein the water in each water tank is circulated and filtered. A method for breeding saltwater fish, which comprises sending the fish to a fish tank, filtering it, and then returning it to each tank again. 2. The method for rearing saltwater fish according to claim 1, wherein the method is sterilization after filtering. 3. A saltwater fish breeding apparatus comprising a plurality of water tanks arranged in parallel in a single stage and a circulation filtration device, wherein a first circulation water pipe for sending water from each water tank to the circulation filtration device. And a second circulation water pipe for returning the water of the circulation filtration device to each aquarium, the saltwater fish breeding device. 4. The apparatus for filtering saltwater fish according to claim 3, wherein a sterilizer is provided on the second circulating water pipe. 5. The apparatus for breeding saltwater fish according to claim 3, wherein the water tank is a water tank having a bottom filtration mechanism. 6. The apparatus for breeding saltwater fish according to claim 5, wherein the aquarium is an overflow type aquarium. 7. A branch pipe for sending water filtered by a circulation filtration device for backwashing the filtration material of the bottom filtration mechanism of the water tank, and a reverse pipe for draining the water in the water tank after the backwashing. The saltwater fish rearing device according to claim 5, further comprising a washing pipe.