JP7170253B2 - Shellfish farming equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an aquaculture apparatus for cultivating shellfish on land.

For the stable supply of shellfish such as freshwater clams and short-necked clams, research on shellfish farming has been actively carried out. In the past, marine aquaculture was the mainstream method for cultivating shellfish, but in recent years land-based aquaculture has been attracting attention because the growth of shellfish is affected by the weather and the underwater environment.

As a land-based aquaculture system for shellfish, a plurality of inclined channel-like water tanks are installed side by side, and growing water such as seawater, freshwater, brackish water, etc. containing a large amount of plankton, which is the food for shellfish, flows from the upstream side to the downstream side of the waterway. A device is known in which shellfish are placed in a water tank and the shellfish are raised in an environment close to a natural environment with flowing water (see, for example, Patent Document 1).

Patent No. 3493357 (page 3, Fig. 4)

The shellfish farming apparatus of Patent Literature 1 is effective as a device for favorably promoting the growth of shellfish. However, no study has been made on how to deal with spawning of shellfish during cultivation. Since only the floating larvae that have been discharged and landed on the bottom of the channel-like tank remain, it is not effective from the viewpoint of increasing the population of mollusks. In addition, zooplankton larger than eggs or floating larvae (e.g., about 0.1 mm to 0.3 mm) (e.g., daphnids of about 1 mm to 3 mm, Eurisca, nematode larvae, etc.) are added to the growing water. is included, and the eggs or floating larvae are predated, and there is a problem that the survival rate of the eggs or floating larvae is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to provide a shellfish farming apparatus capable of effectively increasing the population of shellfish.

In order to solve the above problems, the shellfish aquaculture apparatus of the present invention includes:
A shellfish farming apparatus having a downstream water tank in which growing water flows from upstream to downstream,
The flow-down water tank comprises a mollusk breeding section for cultivating mollusks, a partition provided below the mollusk breeding section and communicating with each other through a branch opening of a face member for restricting the passage of the molluscs, and the molluscs . a weir provided on the downstream side of the cultivating section, and a plurality of the weirs are continuously installed so as to become lower toward the downstream,
Below the surface material, a filter is arranged, through which the eggs laid in the mother shellfish breeding section or floating larvae hatched from the eggs can pass, and which has a pore portion for regulating the passage of zooplankton. cage,
The nurturing water overflows the weir of the upstream flowing water tank and flows into the mother shell growing section of the downstream flowing water tank,
The eggs or floating larvae are characterized in that they pass through the branch opening of the face material from the mother shell-raising section and flow into the partition section via the filter below.
According to this feature, the eggs or floating larvae spawned in the mother shellfish breeding section are collected into the compartment through the fine pores of the filter along with the flow of the breeding water, so that the eggs or floating larvae escape from the aquaculture apparatus. Large zooplankton that prey on eggs or floating larvae can be suppressed from being discharged, and the inflow of large zooplankton that preys on eggs or floating larvae is suppressed by the filter, and eggs or floating larvae are preyed on by zooplankton. can be reduced, so the population of shellfish can be effectively increased.
In addition, since the eggs or floating larvae that have not been collected in the upstream compartment can be collected in the downstream compartment, the amount of collected eggs or floating larvae can be increased.

The partition section is characterized in that it is arranged at a position lower than the floor surface of the mother shellfish breeding section.
According to this feature, the compartment becomes a depression and the influence of the flow of the growing water is reduced, so that the eggs or floating larvae can be effectively kept in the compartment.

It is characterized by comprising a pump for circulating the growing water.
According to this feature, eggs or floating larvae that could not be collected in the compartment can be returned to the upstream side again by the pump, so that the recovery rate of eggs or floating larvae can be improved.

It is a schematic diagram showing a shellfish farming apparatus in an example. It is a perspective view which shows the culture part in a culture apparatus. It is the schematic which shows the culture part in a culture apparatus. It is a sectional side view which shows the structure of a running-down water tank. It is an exploded perspective view which shows the structure of a running-down water tank. (A) is a side sectional view showing the peripheral structure of the compartment, and (B) is an explanatory diagram showing how eggs and floating larvae are collected in the compartment. It is explanatory drawing which shows a mode that the eggs and floating larvae in a division part are sent out to a juvenile shellfish water tank. It is a perspective view which shows the modification of a base member.

A mode for carrying out the shellfish farming apparatus according to the present invention will be described below based on an embodiment.

An apparatus for cultivating shellfish according to an embodiment will be described with reference to FIGS. 1 to 8. FIG. Hereinafter, the left side of the paper surface of FIG. 1 will be described as the front side (downstream side) of the shellfish farming apparatus.

The shellfish farming apparatus 1 of the present embodiment is the content of the invention "Aquarium tank" of Japanese Patent Application Laid-Open No. 2016-86800 filed on October 31, 2014 by Applicant: Zero Staff Co., Ltd., Applicant: Kohei Tanemura. "Sewage in which a circulating water channel is formed inside a sewage treatment table placed above a fish breeding tank and equipped with a shellfish breeding tank in which shellfish are released and reared, and a shellfish spawning tank. A treatment tank and a water-conducting partition plate are provided in the inside of the sewage treatment tank to define a shell filter bed, and an overflow weir is provided for causing the water that has once passed through the shell filter bed to overflow in the form of a waterfall. It is characterized by a circulating drainage tank that returns the water overflowing the weir to the fish breeding tank through the drainage port on the bottom".

As shown in FIG. 1, a shellfish farming apparatus 1 (hereinafter simply referred to as a farming apparatus 1) of this embodiment is a farming apparatus for farming freshwater clams on land. The aquaculture apparatus 1 includes a first pool 2 that stores plankton-containing nurturing water W, a culturing section 3 into which the cultivating water W flows from the first pool 2, and a second culturing section 3 into which the cultivating water W overflows. It is mainly composed of a pool 4, a pump P1 for feeding the growing water W from the first pool 2 to the aquaculture section 3, and a pump P2 for feeding the growing water W from the second pool 4 to the first pool 2.

The first pool 2, the aquaculture section 3, and the second pool 4 are arranged so as to be gradually lowered, and the inclination of the first pool 2 allows the cultivation water W to flow from the first pool 2 toward the second pool 4. ing. Also, the growing water W stored in the second pool 4 is pumped up to the first pool 2 by the pump P2. That is, the breeding water W is circulated within the aquaculture apparatus 1 .

Also, in this embodiment, the second pool 4 is used for hydroponic cultivation of vegetables and plants, and as a farm for aquatic organisms such as catfish, yamame trout, and mozuku crab. The aquaculture section 3 and the second pool 4 are provided in the building, which facilitates temperature control.

In addition, a plurality of solar panels 5, 5, . . In addition, the roof of the building where the second pool 4 is provided is made of a translucent member (for example, glass) and can take in sunlight, so it is suitable for hydroponics and aquaculture. environment can be created.

Also, in the second pool 4, leftover food and excrement of aquatic organisms are generated, but these are pumped up by the pump P2 into the first pool 2, where they are absorbed by phytoplankton as a nutrient source. Further, the phytoplankton grown in the first pool 2 is supplied to the shellfish in the aquaculture section 3 as highly nutritious growing water W rich in food. In addition, the dissolved organic matter remaining in the growing water W supplied to the aquaculture section 3 is oxidatively decomposed and removed by a group of aerobic microorganisms mainly composed of bacteria adhering to shellfish and gravel filter beds in the aquaculture section 3. It is possible to prevent the growing water W in an excessively increased state from flowing into the second pool 4. - 特許庁

In addition, in each pool in which the growth water W of the first pool 2 and the second pool 4 is stored, an appropriate amount of deciduous leaves of broad-leaved trees represented by sawtooth oak and oak is enclosed in a certain net-like bag N, and each pool is kept for a certain period of time. humic substances that remain after microorganisms decompose woody components such as lignin in the growing water W by submerging in water W (humic substances that flow from mountains to the sea are said to have a favorable effect on aquatic organisms, but in the application, This is defined as humic substance.) is eluted from fallen leaves. According to this, it is possible to supply essential nutrients for preventing carcasses due to dissolution of calcium in the crustaceans of the mother clams and juvenile clams in the aquaculture section 3, and the hydroponic cultivation in the second pool 4 and the cultivation process of freshwater organisms. It can bring about a great growth effect.

Next, a specific configuration of the aquaculture section 3 will be described. As shown in FIGS. 2 and 3, a plurality of aquaculture sections 3 are connected in a stepped manner so as to gradually become lower from the upstream side (first pool 2 side) to the downstream side (second pool side). , a young shellfish tank 32 connected to the downstream side of the most downstream flowing water tank 31, a side wall 33 surrounding the side of the flowing water tanks 31, 31, ... and the young shellfish tank 32, 33, . . . A plurality of the water tanks 31, 31, . . .

As shown in FIGS. 3 and 4, each downstream water tank 31 is roughly divided into a mother shellfish breeding section 6 for growing mother shellfish C and a division section 7 partitioned from the mother shellfish breeding section 6. Each compartment 7 communicates with a juvenile clam tank 32 through a pipe 8 (see FIG. 7). A valve (not shown) is provided at a predetermined position of the pipe 8, and by closing the valve, eggs or floating larvae, which will be described later, can be stored in the compartment 7. By opening the valve, eggs or floating larvae can flow into the young shellfish tank 32 .

Next, a specific configuration of the downstream water tank 31 will be described with reference to FIGS. 4 to 7. FIG. As shown in FIGS. 4 and 5, each running water tank 31 is mainly composed of a base member 10, a filter member 11 placed on the base member 10, and a wire mesh member 12 placed on the filter member 11. It is configured.

The base member 10 is formed by bending a metal plate, and includes a horizontally extending flat plate-shaped base portion 10a, a first inclined portion 10b bent so that the upstream side of the base portion 10a is inclined upward, and a base portion. A vertical portion 10c that is bent substantially vertically downward on the downstream side of 10a, a horizontal portion 10d that is horizontally bent from the lower end of the vertical portion 10c toward the downstream side, and an upward direction from the horizontal portion 10d toward the upstream side. and a second inclined portion 10e that is bent so as to be inclined.

A space having a substantially triangular shape in cross section, which is separated from the other space (mother shell growing part 6) by the vertical part 10c, the horizontal part 10d, and the second inclined part 10e, is formed extending in the left-right direction. is the division part 7 mentioned above. The upper end of the second inclined portion 10e is spaced downstream from the vertical portion 10c, so that the opening 7a communicating with the partition portion 7 is formed in the shape of a slit extending left and right. The opening 7 a functions as a branch port for branching the nurturing water W flowing through the mother shell cultivating section 6 to the partition section 7 .

A plate-like piece 10f extending horizontally toward the downstream side is fixed to the first inclined portion 10b. One end of a filter 13 having a plurality of fine pores is fixed to the upper end of the first inclined portion 10b by a fixing member such as an adhesive, and the other end of the filter 13 is adjacent to the upstream side. It is fixed to the weir-constituting member 14 of the flowing-down water tank 31 by the fixing member.

Further, on the upstream side of the uppermost flowing-down water tank 31, a receiving part 34 for receiving the growing water W sent out from the first pool 2 is arranged via the partition part 7'. The other end of the filter 13' at is fixed to the base portion 34a constituting the receiving portion 34 by the fixing member. That is, the opening 7a of the partition 7 and the opening 7a' of the partition 7' are covered with the filters 13, 13'. It should be noted that the mesh size of the pore portions of the filters 13 and 13' of this embodiment is formed to be approximately 0.5 mm.

The weir-constituting member 14 is made of a flat metal plate, and includes a base portion 14a having a substantially oblong rectangular shape when viewed from the front, projecting portions 14b, 14b projecting downward at both left and right ends of the base portion 14a, and the projecting portion 14b. , 14b is bent upstream. Protrusions 14b, 14b of the weir-constituting member 14 are fixed in the vicinity of the upper portion of the vertical portion 10c of the base member 10 by welding or the like. As a result, a slit 15 surrounded by the base portion 14a, the projecting portions 14b, 14b, and the vertical portion 10c is formed between the base member 10 and the weir-constituting member 14. As shown in FIG.

The filter member 11 includes a substantially rectangular frame 11a when viewed from above, and a filter 11b having a plurality of fine pores extending inside the frame 11a. It is placed over the piece portion 10f and the bent portion 14c of the weir-constituting member 14 . Therefore, the filter member 11 is installed in a state spaced above the base portion 10a of the base member 10 by a predetermined distance.

A sealing member (not shown) is disposed at the contact portion between the frame 11a of the filter member 11, the piece 10f of the base member 10, and the bent portion 14c of the weir-constituting member 14, and the frame 11a and the piece 10f are in contact with each other. and the bent portion 14c. The filter 11b of this embodiment is the same as the filters 13 and 13' (the size of the pores is about 0.5 mm).

The wire mesh member 12 is formed in a box shape by a surface material having a corrugated plate net-like cross section having a plurality of uneven shapes, and is erected so as to surround the wire mesh member 12 from a floor surface portion 12e and a peripheral portion of the floor surface portion 12e. It has side wall portions 12a, 12b, 12c, and 12d. A plurality of through holes that are coarser than the pores of the filter 11b are formed in the floor portion 12e and the side wall portions 12a, 12b, 12c, and 12d. That is, each surface of the wire mesh member 12 constitutes a mesh-like surface material. Also, the wire mesh member 12 is placed above the filter member 11 , and a plurality of mother shellfishes C are placed on the floor portion 12 e of the wire mesh member 12 . In other words, the space above the floor surface portion 12e of the wire mesh member 12 constitutes the mother shellfish-raising portion 6. As shown in FIG. The wire mesh member 12 only needs to have a floor surface portion 12e that serves as the mother shell growing portion 6, and the construction of the side wall portions 12a, 12b, 12c, and 12d may be omitted.

Further, the lower space S of the wire mesh member 12 extends up to the slit 15 . The through-holes of the wire mesh member 12 function as branch ports for branching the nurturing water W flowing through the oyster cultivating portion 6 to the dividing portion 7 .

In this way, since the floor surface of the mother shellfish breeding section 6 does not use sand or pebbles, the mother shellfish C does not pinch the pebbles or suck sand into the internal organs, and sand removal work at the time of shipment can be performed. you don't have to. In addition, since most of the load of the wire mesh member 12 is entrusted to the frame 11a of the filter member 11, the load of the wire mesh member 12 applied to the filter 11b can be suppressed.

In addition, the recess of the wire mesh member 12 is formed to a size that does not allow the mother shell C to enter, and a gap corresponding to the recess is formed between the mother shell C and the wire mesh member 12, so that the mother shell C is difficult to close the through holes of the wire mesh member 12 . In addition, the protrusions of the wire mesh member 12 are formed with a width such that the mother shell C is in contact with the plurality of protrusions, and the mother shells C, C, . . . The load is distributed, and the burden on the lowermost mother shell C is reduced.

A side wall portion 12a on the front side of the wire mesh member 12 and side wall portions 12b and 12c positioned in the horizontal direction when viewed from the front are erected from the wire mesh member 12 in a substantially vertical direction, and a side wall portion on the rear side (upstream side) is provided. 12d is erected so as to be inclined along the first inclined portion 10b. Grasping portions 12A and 12B extending substantially vertically are fixed to the upper ends of the front and rear side wall portions 12a and 12d, respectively. The grips 12A and 12B are made of metal plate members. The gripping portions 12A and 12B may be configured by extending the side wall portions 12a and 12d of the wire mesh member 12. As shown in FIG.

According to this, the wire mesh member 12 can be lifted together with the mother shells C, C, . (See FIG. 8). In addition, since the upper end portions of the grip portions 12A and 12B are folded back to form a stepped portion, a finger or the like can be easily hooked. The side wall portions 12b and 12c positioned in the horizontal direction are shown only in FIGS. 5, 7 and 8, and are omitted from FIGS.

As shown in FIG. 6, the nurturing water W flowing into the flow-down water tank 31 is filled into the mother shellfish nurturing section 6 by the weir-constituting member 14, and part of the nurturing water W passes through the filter 11b and then passes through the slit 15. , and overflows the weir-constituting member 14 to flow into another flowing-down water tank 31 adjacent to the downstream side. By changing the height of the weir-constituting member 14, it is easy to adjust the water level of the breeding water W in the mother shellfish breeding section 6. As shown in FIG.

As described above, each of the flowing-down water tanks 31 is connected in a stepped manner, and the weir-constituting member 14 is disposed at the stepped portion, so that the flow of the growing water W flowing down becomes gentle, It is possible to reproduce an environment close to nature such as

Further, as shown in FIG. 6(a), the dividing section 7 is arranged near the downstream side of the weir-constituting member 14 with the opening 7a facing the growing water W overflowing from the weir-constituting member 14. Therefore, part of the growing water W overflowing from the weir-constituting member 14 passes through the filter 13 and branches into the partition section 7 .

The front-rear dimension L1 of the opening 7a of the partition 7 is smaller than the front-rear dimension L2 of the bottom of the partition 7 (on the side of the horizontal portion 10d) (L1<L2). In other words, the partition portion 7 is formed so as to extend outward from the opening area of the opening portion 7a. In addition, the partitioning portion 7 is arranged at a position lower than the floor surface of the upstream mother shell growing section 6, that is, the floor surface portion 12e of the upstream wire mesh member 12 (see the virtual line α in FIG. 6(a)). .

Next, how the eggs or floating larvae are collected in the compartment 7 will be described with reference to FIG. 6(b). Here, large zooplankton are indicated by “○” and eggs or floating larvae are indicated by “dots”. do not have. In addition, descriptions of small zooplankton (0.5 mm or less), phytoplankton, etc. are omitted.

As shown in FIG. 6(b), when the mother shellfish C lays eggs in the mother shellfish breeding section 6, the laid eggs or floating larvae hatched from the eggs float in the breeding water W. As shown in FIG. Eggs or floating larvae floating on the water surface side of the nurturing water W overflow from the weir-constituting member 14 together with the nurturing water W. be.

Specifically, since eggs or floating larvae generally have a size of about 0.1 mm to 0.3 mm, they pass through the fine pores (0.5 mm) of the filter 13 and are collected in the compartment 7. It will be done. On the other hand, large zooplankton that prey on eggs or floating larvae are daphnids, midges, nematode larvae, etc., and are generally about 1 mm to 3 mm in size, so the pores of the filter 13 I can barely get through the part. Therefore, it is difficult for large zooplankton to enter the compartment 7, and the eggs or floating larvae collected in the compartment 7 are not preyed on, so the survival rate of the eggs or floating larvae is improved. do.

In addition, zooplankton of 0.5 mm or less may enter the compartment 7, but since there is almost no size difference compared to eggs or floating larvae, eggs or floating larvae may be preyed on. is reduced.

In addition, since the partitioning portion 7 is arranged in the vicinity of the downstream side of the weir-constituting member 14 with the opening 7a facing the growing water W overflowing from the weir-constituting member 14, the partition portion 7 overflows the weir-constituting member 14. Eggs or floating larvae can be effectively collected in the compartment 7 together with the growing water W.

Eggs or floating larvae not collected in the compartment 7 move to the downstream water tank 31 adjacent to the downstream side. Since a plurality of downstream water tanks 31 are connected downstream, eggs or floating larvae that have not been collected in the upstream partitioning section 7 can be collected in the downstream partitioning section 7. You can increase the amount you collect.

On the other hand, eggs or floating larvae floating on the bottom side of the mother shell growing section 6 pass through the wire mesh member 12 and the filter 11b together with the growing water W and move into the lower space S below the filter 11b. At this time, zooplankton that preys on eggs or floating larvae is prevented from entering the compartment 7 by the filter 11b. Eggs or floating larvae that have moved to the lower space S are collected in the compartment 7 via the slit 15 . In this way, eggs or floating larvae can be effectively collected over a wide range by utilizing the through holes of the floor surface 12e of the wire mesh member 12, that is, the substantially entire bottom portion of the mother shellfish breeding section 6.

In addition, as described above, since the mother shellfish C does not enter the recessed portion of the wire mesh member 12, the mother shellfish C is less likely to block the through-hole portion of the recessed portion of the wire mesh member 12. Floating larvae can easily pass through the through-holes of the concave portion of the wire mesh member 12 .

Further, as described above, the front-rear dimension L1 of the opening 7a of the partition 7 is smaller than the front-rear dimension L2 of the bottom of the partition 7. It is possible to suppress the eggs or floating larvae that have once been taken into the compartment 7 from being rolled up by the flow of the growing water W and flowing out of the compartment 7 again.

In addition, since the division part 7 is arranged at a position lower than the floor surface (virtual line α) of the mother shellfish breeding part 6, the division part 7 becomes a depression, and the influence of the flow of the breeding water W on the division part 7 is reduced. do. In other words, since the rearing water W tends to stay on the bottom side of the compartment 7 , eggs or floating larvae can be effectively retained in the compartment 7 .

By closing the valve of the pipe 8, the eggs or floating larvae collected in the compartment 7 are retained in the compartment 7 and raised for a predetermined period. The term "predetermined period" as used herein refers to the period until eggs or floating larvae become bottom-seated juvenile shellfish. After a predetermined period of time has passed, the valve is opened to allow the young clams on the bottom to flow into the tank 32 for young clams.

Specifically, as shown in FIG. 7 , a pipe 8 is connected to the right end (one end) of the rightmost partition 7 among the partitions 7 arranged in series on the left and right. A supply pipe (not shown) capable of supplying the growing water W is connected to the left end (the other end) of the leftmost partitioning portion 7 among the partitioning portions 7 that are connected. By opening the valve of the pipe 8 and supplying the raising water W from the supply pipe, the water pressure of the raising water W sends out the juvenile clams to the juvenile clam tank 32 through the pipe 8 . In addition, a planar wire mesh member 12' is laid on the bottom surface of the juvenile shellfish tank 32, and the bottom juvenile shellfish that flow into the juvenile shellfish tank 32 adhere to the wire mesh member 12' by byssus threads, It is grown in that state (see FIG. 3).

In addition, the eggs become floating larvae (so-called D-type larvae) about one day after fertilization, and become bottom-seated fry about seven to ten days after fertilization. The operation of sending young clams to the young clam tank 32 is performed in a cycle of about ten days. Furthermore, the cycle of the operation of sending the bottom-seated young clams to the young clam tank 32 may be freely changed.

In this way, eggs or floating larvae can be collected in the compartment 7 to suppress predation by zooplankton, and can be cultivated in the juvenile shellfish tank 32 after being made into bottom-seated juvenile shellfish. number can be effectively increased. In addition, the bottom-seated young clams that have flowed into the young shellfish tank 32 stay in the young shellfish tank 32 by adhering to the wire mesh member 12', but the zooplankton is discharged to the second pool 4 together with the nurturing water W. Therefore, it is possible to reduce the predation of the bottom-seated juvenile shellfish by zooplankton.

In addition, eggs or floating larvae may flow into the young shellfish tank 32. In this case, the eggs or floating larvae may overflow from the young shellfish tank 32 and flow into the second pool 4 (see FIG. 3). ). Eggs or floating larvae that have flowed into the second pool 4 are pumped up to the first pool 2 together with the nurturing water W by the pump P2, and flow into the aquaculture section 3 again. The recovery rate of eggs or floating larvae can be increased.

In this embodiment, the pump P2 circulates the cultivation water W in the aquaculture apparatus 1. However, if the cultivation water W is configured to flow through the aquaculture section 3 at any time, the cultivation water W is not circulated. It may be discharged to the outside of the aquaculture apparatus 1 at the same time. Even in this case, since the eggs or floating larvae are collected by the partition part 7, the recovery rate of eggs or floating larvae can be increased compared to the conventional aquaculture apparatus without the partition part 7, and the number of shellfish populations can be increased. can be effectively increased.

Further, the shape and position of the compartment are not limited to those of the above-described embodiment. As long as they are partitioned, they may be configured freely. For example, a division part having a concave cross-sectional shape and having a branch opening facing the upstream side of the nurturing water W flowing through the mother shellfish nurturing part 6 may be arranged on the water surface side of the nurturing water W.

Further, in the above-described embodiment, an embodiment is illustrated in which two branch ports (the opening 7a and the through-hole portion of the wire mesh member 12) for branching a part of the growing water W are provided in the partition portion 7, but the partition portion The number of branch ports for the may be one, or three or more may be provided. The shape of the branch port may be freely designed.

Further, in the above-described embodiment, shellfish cultured in the aquaculture apparatus 1 is explained as freshwater clams, but it is not limited to this, and can be changed variously, for example, short-necked clams, oysters, and abalones.

In addition, in the above-described embodiment, the filter 11b, 13, 13' is exemplified by a configuration in which the mesh size of the pores is approximately 0.5 mm. Eggs or floating larvae with a size of about 0.3 mm can pass through, and zooplankton with a size of about 1 mm to 3 mm can hardly pass through. That is, a mesh size of about 0.01 mm to 1 mm is sufficient, and a mesh size of about 0.05 mm to 0.5 mm is more preferable. The mesh size of the pore portion of the filter may be changed according to the size of eggs or floating larvae of shellfish cultured in the aquaculture apparatus 1 .

Further, in the above-described embodiment, the configuration in which the water tanks 31, 31, ... are formed in a stepped manner so as to become lower toward the downstream was exemplified, but the configuration is not limited to this. It may be composed of an inclined surface, and a plurality of the inclined surfaces may be arranged so as to be linearly continuous. Further, the flow velocity of the growing water W may be appropriately adjusted by changing the height of the steps of the water tanks 31, 31, . . .

There are also the following modifications of the base member. For example, as shown in FIG. 8, the base member 100 is a box-shaped frame having a rectangular shape in plan view, and has a space in which a plurality (for example, three) of wire mesh members 12 can be arranged side by side. Each space is partitioned by partition walls 100a, 100a. A partition is arranged on the downstream side of the base member 100, and a slit is provided in the downstream side wall portion of the base member 100 to communicate the partition with the upstream partition. (not shown). According to this, since a plurality of wire mesh members 12 can be handled as a unit, the installation work of the aquaculture apparatus 1 can be easily performed. Further, by lifting the wire mesh member 12, maintenance such as cleaning work for preventing clogging of the filter member 11 can be easily performed. Also, the partition walls 100a, 100a, 100a can guide the wire mesh member 12 in and out.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention. be

For example, in the above-described embodiment, an adhesive is used as a fixing member for fixing the filters 11b, 13, and 13', but the present invention is not limited to this. .

Further, in the above-described embodiment, the juvenile shellfish tank 32 is connected to the downstream side of the most downstream flowing water tank 31. For example, juvenile clam water tanks provided independently without being connected directly to the flowing-down water tanks 31, 31, . . . may be used. According to this, it is possible to suppress the inflow of large zooplankton into the juvenile shell tank, thereby reducing the predation of eggs, floating larvae, and bottom juvenile shellfish in the juvenile shell tank.

In addition, the pipe 8 connecting the juvenile shellfish tank 32 and the compartments 7, 7', . , the configuration of the valve may be omitted so that the juvenile clam tank 32 and the compartments 7, 7', . . .

In the above embodiment, the upper surface of the wire mesh member 12 is used as the mother shellfish growing portion 6, but the structure of the wire mesh member 12 may be omitted and the upper surface of the filter member 11 may be used as the mother shellfish growing portion 6.

1 aquaculture device 6 mother shellfish breeding parts 7, 7' partition parts 7a, 7a' opening (branching mouth)
11b Filter 12 wire mesh member (mesh face material)
13, 13' filter 14 weir component (weir)
31 Flowing water tank 32 Juvenile clam water tank (separate water tank from flowing water tank)
C Mother shellfish P1 Pump P2 Pump W Nurturing water

Claims (3)

A shellfish farming apparatus having a downstream water tank in which growing water flows from upstream to downstream,
The flow-down water tank comprises a mollusk breeding section for cultivating molluscs, and a partition section provided below the mollusk breeding section and communicating with each other through a branch opening of a face member that restricts the passage of the molluscs.a weir provided on the downstream side of the parent shell growing section;withMultiple are installed so that it becomes low toward the downstream,
Below the surface material, a filter is arranged, through which the eggs laid in the mother shellfish breeding section or floating larvae hatched from the eggs can pass, and which has a pore portion for regulating the passage of zooplankton. cage,
the nurturing water overflows the weir of the upstream flowing water tank and flows into the mother shell growing section of the downstream flowing water tank;
A shellfish aquaculture apparatus, wherein the eggs or floating larvae pass through a branch opening of the face member from the mother shellfish breeding section and flow into the partition section through the filter below. 2. The shellfish aquaculture apparatus according to claim 1 , wherein the partitioning section is arranged at a position lower than the floor surface of the mother shellfish growing section. 3. The shellfish farming apparatus according to claim 1, further comprising a pump for circulating the growing water.

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