JP7253794B2 - Shellfish farming equipment - Google Patents

Description

The present invention relates to an aquaculture apparatus for land-based aquaculture of shellfish.

In order to stably supply shellfish such as freshwater clams, clams, and short-necked clams, research and development of shellfish farming have been conducted. Conventional shellfish farming methods can be broadly classified into marine farming and land farming. Undersea aquaculture has the advantage that it is easy to create an environment that is relatively close to the actual habitat environment, but it has the disadvantage that the working environment is harsh and it is difficult to provide a stable supply due to weather and sea storms. Therefore, land-based aquaculture, which does not have these disadvantages and is easy to manage the aquaculture environment, is attracting attention.

In land-based aquaculture of shellfish, there are cases in which breeding water supplied from rivers, waterways, ponds, the sea, water reservoirs for supplying breeding water, etc. is stored in aquaculture equipment in which eggs and larvae of shellfish are farmed. . Such nurturing water contains phytoplankton that feeds shellfish, minerals that provide nutrients, and zooplankton (for example, daphnids of about 1 mm to 3 mm, larvae of chironomids, nematodes, etc.). ing. Zooplankton move freely in the breeding water, and eggs and larvae of mollusks may be preyed on, resulting in a significant decrease in the survival rate of eggs and larvae.

Therefore, there is known an aquaculture apparatus for terrestrial aquaculture of shellfish that allows zooplankton to flow out of the aquaculture apparatus. For example, the aquaculture apparatus disclosed in Patent Document 1 includes a mother clam breeding tank, a juvenile clam breeding tank configured by defining three adjacent juvenile clam breeding channels, and a drainage tank. It is a device. In this mashijimi aquaculture apparatus, the drainage port of the mother clam breeding tank is connected to the inlet of the juvenile clam breeding channel, and the drain port of the juvenile clam breeding channel is connected to the drainage tank. It is Further, at the downstream end of the juvenile clam growth channel, there is provided a flow control means consisting of a detachable rectangular flow control plate. Breeding water (cultivating water) for growing mother clams is continuously supplied from the breeding water supply tank installed outside the mashijimi aquaculture apparatus to the mother clam growth tank by a water supply pump, and flows into the juvenile clam growth channel. do. Pests (zooplankton) such as daphnids (including eggs), nematodes, eggs and larvae of midges, which hinder the growth of common clams, are controlled along with breeding water by the flow rate control installed at the downstream end of the juvenile growth channel. It flows out to the wastewater tank by overflowing the plate.

Japanese Patent Application Laid-Open No. 2019-50764 (pages 9 to 11, FIGS. 1 and 2)

In this way, in the majimi aquaculture apparatus of Patent Document 1, the zooplankton floating in the middle to upper layers of the water is overflowed from the flow rate control plate to flow out to the drainage tank. It suppresses predation of shellfish eggs and larvae by zooplankton. However, when the upper layer of the breeding water overflows the flow rate control plate provided at the downstream end of the young clam growth channel and flows out to the drainage tank, the middle and lower layers of the breeding water near the flow rate control plate in the young clam growth channel A vortex is generated by the part being pulled by the overflow of the upper part. Therefore, there is a problem that even eggs and larvae floating on the bottom or in the lower layer are swirled up to the vicinity of the water surface by the vortex, overflow the flow control plate together with the pests, and flow out to the drainage tank.

The present invention has been made in view of such problems, and an object of the present invention is to provide an aquaculture apparatus for terrestrial aquaculture of shellfish, which can effectively increase the population of shellfish.

In order to solve the above problems, the shellfish aquaculture apparatus of the present invention includes:
A shellfish farming apparatus for growing shellfish in a growing tank supplied with growing water,
Separation fins protruding toward the growth tank are provided on the peripheral wall of the growth tank and spaced upward from the bottom surface of the growth tank,
The cultivating water is characterized in that it overflows the upper surface of the separation fin and flows out of the cultivating tank.
According to this feature, the growing water in the growing tank is separated into upper and lower parts by the separating fins, and the growing water above the separating fins overflows the upper surfaces of the separating fins and flows out of the growing tank. Since the layer of growing water in the lower part is separated from the layer of growing water overflowing the upper surface of the separation fins, the layer stays without being pulled by the flow of the growing water in the layer above the separation fins. Therefore, no vortex is generated in the growing water layer below the separation fins, and the eggs or larvae that land on the bottom or float in the lower layer of the growing water layer below the separation fins. It is possible to prevent even mollusks from being swirled up to the vicinity of the water surface by the eddy current, overflowing the separating fins together with the growing water, and flowing out of the growing tank, thereby effectively increasing the population of shellfish. .

The cultivating tank is formed to be long, and a supply part for supplying the cultivating water is provided at one end in the longitudinal direction of the peripheral wall of the cultivating tank, and the other end in the longitudinal direction of the peripheral wall of the cultivating tank is provided. A low portion extending downward from an upper edge on one longitudinal end side is provided, and the separation fin is provided in the low portion.
According to this feature, in the vicinity of the supply section, the peripheral wall of the growth tank is higher than in the lower part. It is possible to prevent the eggs and larvae that are swirled up to the upper and middle layers by the water flow from flowing out of the breeding tank, and the separation fins provided in the lower part where the water flow is stable allow the breeding water to flow out of the breeding tank. Since it flows out, zooplankton floating in the upper and middle layers can be effectively discharged into the drainage tank, and eggs and larvae can be suppressed from flowing out into the drainage tank.

The separation fins are provided on a side wall of the growth tank extending in the direction of flow of the growth water, and the projection width of the separation fins increases from one end in the longitudinal direction of the side wall of the growth tank toward the other end in the longitudinal direction. It is characterized by being formed
According to this feature, since the separation fins are provided on the side wall of the cultivating tank, it is less likely to be affected by the vortex generated near the wall of the cultivating tank that intersects the flow of the cultivating water, and the eggs and larvae are kept in the drainage tank. can be suppressed. In addition, since the resistance between the separation fins and the growing water overflowing the separating fins can be reduced, the growing water can smoothly overflow the upper surfaces of the separation fins and flow out of the growing tank.

The separation fins are provided on a side wall of the cultivating tank extending in the direction of flow of the cultivating water. It is characterized by being erected on the upper surface of the
According to this feature, when the growing water overflows the upper surface of the separation fins, the growing water flows in a certain direction along the direction of the guide fins without being disturbed, so that the growing water flows smoothly. can be discharged out of the growth tank at the same time.

A peripheral portion of the separation fin is characterized in that a portion into which the growing water flows is tapered in a thickness direction.
According to this feature, resistance between the periphery of the separation fins and the growing water flowing into the separating fins can be reduced, so that the growing water smoothly overflows the upper surfaces of the separation fins and flows out to the drainage tank. can be done.

The separation fins are characterized by having an angle adjustment mechanism capable of adjusting an inclination angle.
According to this feature, since the inclination angle of the separation fins can be adjusted according to the depth of the layer in which the zooplankton is floating in the growing water, the zooplankton can easily overflow the separation fins effectively. .

1 is a perspective view showing a shellfish farming apparatus, a growing water supply pool, and a growing water drainage pool in Example 1 of the present invention. FIG. It is a perspective view which similarly shows the structure of the culture apparatus of a shellfish. FIG. 4 is a plan view showing the flow of growing water; FIG. 4 is a side cross-sectional view showing the flow of growing water; FIG. 4 is a rear cross-sectional view showing the flow of growing water; (a) is a plan view showing the structure of the separation fin in Example 2, (b) is a cross-sectional view along line AA in FIG. 6(a), and (c) is a cross-sectional view along line BB in FIG. 6(a). . 7A is a perspective view showing the structure of the separation fin angle adjustment mechanism in Example 3, and FIG. 7B is a schematic diagram showing an angle adjustment method of the separation fin angle adjustment mechanism of FIG. 7A. FIG. 11 is a perspective view showing the structure of a shellfish farming apparatus in Example 4; 9(a) is a plan view showing the flow of growing water in the shellfish culturing apparatus of FIG. 8, and FIG. 9(b) is a longitudinal sectional view showing the flow of cultivating water in the shellfish aquaculture apparatus of FIG.

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

A shellfish farming apparatus according to a first embodiment will be described with reference to FIGS. 1 to 5. FIG. In the following description, the left side of the paper surface of FIG. 3 is the front side (downstream side) of the shellfish aquaculture apparatus, and the horizontal direction as viewed from the front is the left and right sides.

As shown in FIG. 1, the shellfish aquaculture apparatus 1, 1 (hereinafter simply referred to as aquaculture apparatus 1, 1) in the first embodiment has a cultivation water 6 for storing and supplying to the aquaculture apparatus 1, 1. It is installed outdoors together with a water supply pool 2 and a growing water drainage pool 3 for draining growing water 6 from the aquaculture apparatuses 1,1. The aquaculture apparatuses 1, 1 shown in FIG. 1 have the same shape, have the same function, and exhibit the same action. Therefore, for the sake of convenience, only one aquaculture apparatus 1 will be described below. .

As shown in FIG. 4 , a supply pump P is arranged inside the cultivation water supply pool 2 to send out the cultivation water 6 toward the aquaculture apparatus 1 . Supply pipes 21, 21 (supply units) for supplying the cultivation water 6 to the aquaculture apparatus 1 are connected to the supply pump P, respectively. are extended to each. In addition, the cultivation water 6 to be supplied to the aquaculture apparatus 1 is stored inside the cultivation water supply pool 2 . River water is used as the growing water 6, and phytoplankton contained in the river water is cultivated. The cultivated phytoplankton is used as food for the common clam. In addition, the growing water 6 is rich in dissolved oxygen and minerals that serve as nutrients for the clams. Further, an appropriate amount of fallen leaves of broadleaf trees such as sawtooth oak and oak may be enclosed in a mesh bag and submerged in the growth water supply pool 2 for a certain period of time. As a result, humic substances can be eluted from fallen leaves, preventing carcasses due to dissolution of calcium in the crustaceans of mother clams and juvenile clams. The humic substances are corrosive substances that remain after microorganisms decompose wood components such as lignin, and the corrosive substances that flow from the mountains into the sea are said to have a positive effect on aquatic organisms. defined as ).

As shown in FIGS. 1 and 3, the growing water 6 flowing into the growing tanks 4a and 4b of the aquaculture apparatus 1 flows through the growing tanks 4a and 4b, and passes over the upper surfaces of the separation fins 15a and 15b as described later. Then, the water flows out to the drainage tank 5, and then to the growing water drainage pool 3 through the drainage pipe 51 communicating with the drainage port 51a. The mother clam 8a of the common clam 8a is grown in the breeding tanks 4a and 4b and releases eggs or larvae 8b.

As shown in FIG. 1, the cultivation water drainage pool 3 is arranged at a level lower than the height at which the cultivation apparatus 1 is arranged, and the cultivation water 6 flowing out from the drainage pipe 51 of the cultivation apparatus 1 is cultivated. It can be stored inside the water drainage pool 3 . In the first embodiment, the cultivation water drainage pool 3 is used as a pool for cultivating aquatic organisms that prey on zooplankton 7 contained in the cultivation water 6 . Incidentally, the cultivation water drainage pool 3 may be omitted, and the cultivation water 6 of the aquaculture apparatus 1 may be discharged directly to an external drainage ditch or the like through the drainage pipe 51 .

More specifically, as shown in FIG. 2, the aquaculture apparatus 1 has a rectangular parallelepiped shape with an open upper surface, and is elongated in the front-rear direction. 11d, surrounded by the bottom plate 12, near the center of the bottom plate 12 in the left-right direction, partition walls 13a and 13b (side walls) extending in the front-rear direction are provided in parallel with each other at regular intervals in the left-right direction. On the front side (the other end in the longitudinal direction) of the partition walls 13a and 13b, there are recesses 14a and 14b (lower portions) that are lower than the upper edge 13c on the rear side (the one end in the longitudinal direction) of the partition walls 13a and 13b. It is formed by notching. The side walls 11a, 11b, 11c, 11d, the bottom plate 12, and the partition walls 13a, 13b are made of lumber coated with a waterproof coating. The side walls 11a, 11b, 11c, and 11d, the bottom plate 12, and the partition walls 13a and 13b are not limited to being made of wood. good.

The space surrounded by the partition walls 13a and 13b, the side walls 11a and 11c, and the bottom plate 12, that is, the space between the growth tanks 4a and 4b is the drainage tank 5. is provided with a drain port 51a and a drain pipe 51 is attached. The space surrounded by the partition wall 13a, the side walls 11a, 11b, 11c, and the bottom plate 12, and the space surrounded by the partition wall 13b, the side walls 11a, 11c, 11d, and the bottom plate 12 are the growth tanks 4a and 4b, respectively, It is defined and formed on both sides of the drainage tank 5 . The partition wall 13a and the side walls 11a, 11b and 11c form the peripheral wall of the growth tank 4a, and the partition wall 13b and the side walls 11a, 11c and 11d form the peripheral wall of the growth tank 4b.

As shown in FIGS. 2 to 4, the separation fins 15a and 15b are formed of a plastic plate having a right-angled triangle shape in plan view, and side portions 17b and 17e of the respective separation fins 15a and 15b extend along the partition walls 13a and 13a. It is fixed by a fixing means (not shown) such as a screw near the bases forming the concave portions 14a and 14b of 13b. The separation fins 15a and 15b are formed obliquely from the partition walls 13a and 13b toward the growth tanks 4a and 4b so that the free ends protrude slightly downward. Here, the sides of the separation fins 15a and 15b on the side of the partition walls 13a and 13b are referred to as sides 17b and 17e, and the oblique sides of the separation fins 15a and 15b are referred to as sides 17a and 17f (peripheral edges).

Guide fins 16a to 16c are provided on the upper surface of the separation fin 15a, and guide fins 16d to 16f are provided on the upper surface of the separation fin 15b so as to be separated from each other in the flow direction of the growing water 6. These guide fins 16a. 16f are formed from a rectangular plastic plate. Specifically, the guide fins 16a to 16c extend across the side portion 17a and the side portion 17b of the separation fin 15a, and extend the growth tank 4a such that the side portion 17a side is positioned upstream in top view. It is inclined with respect to the installation direction (flow direction of the growing water 6). Similarly, the guide fins 16d to 16f extend across the side portion 17f and the side portion 17e of the separation fin 15b, and are arranged in the extending direction of the growth tank 4b ( It is inclined with respect to the flow direction of the growing water 6). The separating fins 15a and 15b and the guiding fins 16a to 16f are not limited to plastic plates, and may be made of wood plates, metal plates, or the like.

As shown in FIGS. 3 and 4, the mother clam 8a of the common clam 8a is placed and housed on the bottoms of the breeding tanks 4a and 4b, and is grown. Common clams are hermaphrodites, and release eggs that have been spawned and fertilized inside the body and larvae that have hatched inside the body (so-called D-type larvae) to the outside of the body. The eggs or larvae 8b are once released from the middle layer to the upper layer of the growing water 6 and float there. It settles on the bottom of 4b and grows.

As shown in FIGS. 4 and 5, the zooplankton 7 that flowed into the growing tanks 4a and 4b floats mainly in the middle and upper layers of the growing water 6 because of their low specific gravity relative to the growing water 6. FIG. Therefore, the possibility that the eggs or larvae 8b that have landed on the bottom of the cultivation tanks 4a and 4b will be eaten by the zooplankton 7 is extremely low.

The flow of the breeding water 6 inside the aquaculture apparatus 1 will be described. The growth tanks 4a and 4b, the separation fins 15a and 15b, the guide fins 16a to 16c and the guide fins 16d to 16f have symmetrical shapes with respect to the drainage tank 5, and have the same functions and actions. For the sake of convenience, only the growth tank 4a, the separation fins 15a, and the guide fins 16a to 16c will be described.

As shown in FIGS. 3 to 5, the growing water 6 supplied to the rear side of the growing tank 4a from the supply pipe 21 flows to the front side of the growing tank 4a, overflows the upper surface of the separating fins 15a, and flows into the guiding fins 16a. 16c to the drainage tank 5 (outside the growth tank 4a). At this time, the layer of the growing water 6 under the separation fins 15a is separated from the layer of the growing water 6 overflowing the upper surfaces of the separation fins 15a by the separation fins 15a, and overflows the upper surfaces of the separation fins 15a. Since the growing water 6 is not pulled toward the partition wall 13a and stays there, no vortex is generated in the layer of the growing water 6 below the separation fins 15a. Therefore, in the layer of the growing water 6 below the separating fins 15a, even the eggs or larvae 8b that have landed on the bottom of the growing tank 4a or are floating in the lower layer of the growing water 6 are moved to the vicinity of the water surface by the vortex. It is possible to prevent the water from being lifted up to the maximum, overflowing the separation fins 15 a together with the growing water 6 , and flowing out to the drainage tank 5 . That is, the zooplankton 7 can be discharged from the breeding tank 4a to the drainage tank 5 while leaving the eggs or larvae 8b in the breeding tank 4a, so that the survival rate of the eggs or larvae 8b can be effectively increased. can.

As shown in FIG. 4, zooplankton 7 and eggs or larvae 8b in the growing water 6 are fed from the growing water 6 flowing from the supply pipe 21 on the upstream side of the growing tank 4a (rear side of the growing tank 4a). being stirred. On the other hand, on the downstream side of the cultivating tank 4a (the front side of the cultivating tank 4a), since the water flow is stable and stable, the zooplankton 7 in the cultivating water 6 on the downstream side floats in the upper and middle layers, Alternatively, the larvae 8b settle on the bottom of the growth tank 4a or float in the lower layer. Separation fin 15a is fixed near the bottom of recess 14a formed on the downstream side of partition wall 13a. Therefore, the zooplankton 7 floating in the upper and middle layers of the growing water 6 on the downstream side, where the water flow is regular and stable, can be effectively discharged to the drainage tank 5. - 特許庁Further, in the growing water 6 below the separation fins 15a, it is possible to prevent eggs or larvae 8b that have landed on the bottom or are floating in the lower layer from flowing out to the drainage tank 5. In addition, the upper edge 13c of the partition wall 13a of the cultivating tank 4a is higher than the recess 14a on the upstream side of the cultivating tank 4a where the water flow is difficult to stabilize due to the supply of the cultivating water 6. Since the water 6 does not flow out to the drainage tank 5, the eggs or larvae 8b that are swirled up to the upper layer part or the middle layer part due to the water flow disturbed by the supply of the growing water 6 can be prevented from flowing out to the drainage tank 5. - 特許庁

As shown in FIGS. 2 to 4, the width of the separation fins 15a protruding toward the growth tank 4a is formed so as to expand from upstream to downstream. Therefore, the resistance between the growing water 6 and the side portions 17a of the separating fins 15a that is generated when the growing water 6 flows into the separating fins 15a can be reduced, and the growing water 6 smoothly overflows the upper surfaces of the separating fins 15a. and can be discharged to the drainage tank 5. In addition, since the separation fins 15a are provided on the partition wall 13a extending along the flow direction of the growing water 6, it is less likely to be affected by the vortex flow generated in the vicinity of the side wall 11c perpendicular to the flowing direction of the growing water 6. It is possible to suppress the larvae 8b from flowing out to the drainage tank 5.

As shown in FIGS. 2 to 5, guide fins 16a to 16c for guiding the growing water 6 to the drainage tank 5 are erected on the upper surface of the separation fin 15a. Therefore, when the growing water 6 overflows the upper surface of the separation fin 15a, the growing water 6 flows in a certain direction along the directions of the guide fins 16a to 16c without being disturbed. 6 can be smoothly discharged to the drainage tank 5. In addition, since the guide fins 16a to 16c extend from upstream to downstream toward the growth tank 4a, the flow rate of the growth water 6 flowing out to the drainage tank 5 can be stabilized, and the water flow is further stabilized.

Next, an aquaculture apparatus according to Example 2 will be described with reference to FIG. It should be noted that the description of the configuration that is the same as that of the above-described embodiment and overlaps will be omitted.

The separation fin 151a of the second embodiment will be described. As shown in FIG. 6(a), the separation fin 151a has a right-angled triangular shape in plan view, and as shown in FIGS. It is formed so as to taper in the thickness direction. Therefore, it is possible to reduce the resistance between the growing water 6 and the side portions 17a' of the separating fins 151a, which is generated when the growing water 6 flows into the separating fins 151a, so that the growing water 6 smoothly flows over the upper surfaces of the separating fins 151a. It can be drained and discharged to the drainage tank 5.

Next, an aquaculture apparatus according to Example 3 will be described with reference to FIG. It should be noted that the description of the configuration that is the same as that of the above-described embodiment and overlaps will be omitted.

An angle adjustment mechanism 18 capable of adjusting the inclination angle of the separation fins 15a of the third embodiment will be described.

As shown in FIG. 7(a), the angle adjusting mechanism 18 of the third embodiment comprises a positioning plate portion 18a, an adjusting hole 18b, a pin 18c, a side wall side adjusting hole 18d, and hinges 18e and 18f. The side portion 17b of the separation fin 15a is attached to the bottom portion forming the recess 14a of the partition wall 13a by hinges 18e and 18f. A positioning plate portion 18a is erected on a side portion 17c of the separation fin 15a adjacent to the side wall 11c. Further, an adjustment hole 18b is provided through the positioning plate portion 18a. Side wall adjustment holes 18d, 18d, . orbit) are provided respectively.

As shown in FIGS. 7A and 7B, the adjustment hole 18b of the positioning plate portion 18a provided in the separation fin 15a is aligned with the arbitrary side wall side adjustment hole 18d, and the pin 18c is inserted. By doing so, the separation fin 15a can be fixed at a desired inclination angle. Thereby, the inclination angle of the separation fins 15a can be adjusted according to the floating depth of the zooplankton 7 . For example, when the zooplankton 7 floats mainly in the upper layer of the growing water 6, the tilt angle of the separation fin is set to θ1, and when it floats from the upper layer to the middle layer, the tilt angle is set to θ2. can be adjusted. Therefore, the zooplankton 7 can overflow the upper surfaces of the separation fins 15a and flow out to the drainage tank 5 more effectively than when the separation fins 15a have a fixed inclination angle. In FIG. 7(b), the separation fin 15a and the positioning plate portion 18a when the inclination angle is adjusted to θ1 are indicated by a solid line, and the separation fin 15a and the positioning plate portion 18a when the inclination angle is adjusted to θ2 are shown by two lines. Indicated by a dash-dotted line.

Also, the inclination angle of the separation fins 15a can be adjusted according to the growth stage of the eggs or larvae 8b. For example, when the eggs or larvae 8b are released from the mother clam 8a of the majimi clam 8a soon after, and the number of eggs or larvae 8b floating in the middle to upper layers of the breeding water 6 is relatively large. , the inclination angle of the separating fins 15a can be adjusted to be small so that eggs or larvae 8b do not overflow into the drainage tank 5 together with the growing water 6. In addition, when the eggs or larvae 8b settle on the bottom of the cultivating tank 4a and grow into juvenile clams and adult clams, the risk of overflowing into the drainage tank 5 together with the nurturing water 6 is gradually reduced. The zooplankton 7 can be effectively overflowed into the drainage tank 5 by increasing the inclination angle of the separation fins 15a stepwise.

Next, a farming apparatus according to Example 4 will be described with reference to FIGS. 8 and 9. FIG. The same reference numerals are assigned to the same components as those shown in the above embodiment, and redundant explanations are omitted.

As shown in FIG. 8, the aquaculture apparatus 10 according to the fourth embodiment has a rectangular parallelepiped shape with an open upper surface and is surrounded by side walls 101a, 101b, 101c, and 101d and a bottom plate 102. , a partition wall 103 is provided on the upstream side of the side wall 101c in parallel with the left-right direction. The side walls 101a, 101b, 101c, 101d, the bottom plate 102, and the partition wall 103 are made of waterproof-coated wood. The side walls 101a, 101b, 101c, 101d, the bottom plate 102, and the partition wall 103 are not limited to wood, and may be made of corrosion-resistant materials such as concrete, reinforced plastic, and stainless steel.

The upper edge portion of the partition wall 103 is lower than the upper edge portions of the side walls 101a, 101b, 101c and 101d. A space surrounded by the partition wall 103, the side walls 101b, 101c, 101d, and the bottom plate 102 is a drain tank 50, and a drain port 501a communicating with the drain tank 50 is provided at the lower part of the side wall 101c. installed. A space surrounded by the partition wall 103, the side walls 101a, 101b, 101d, and the bottom plate 102 is the growth tank 40, which is defined on the upstream side of the drainage tank 50. As shown in FIG.

As shown in FIGS. 8, 9(a) and 9(b), the separation fin 105 is formed of a rectangular plastic plate in a plan view, and one side on the downstream side is the upper edge of the partition wall 103. As shown in FIGS. It is fixed by fixing means (not shown) such as a screw in the vicinity of the part. Further, the separation fins 105 are formed so as to protrude slightly downward toward the growth tank 40 side. The separating fins 105 are not limited to be made of a plastic plate, and may be made of, for example, a wood plate or a metal plate.

As shown in FIGS. 9( a ) and 9 ( b ), the growing water 6 inside the growing tank 40 flows downstream, overflows the upper surface of the separating fins 105 , and flows out to the drainage tank 50 . At this time, the layer of growing water 6 under the separation fins 105 is not pulled toward the partition wall 103 by the layer of the growing water 6 overflowing the upper surface of the separation fins 105, and is in a state of being retained. A vortex does not occur in the layer of the growing water 6 below 105 . Therefore, in the layer of the growing water 6 below the separation fins 105, even the eggs or larvae 8b that have landed on the bottom or are floating in the lower layer are swirled up to the vicinity of the water surface by the vortex, and together with the growing water 6. It is possible to prevent the liquid from overflowing the separation fins 105 and flowing into the drainage tank 50 .

In the fourth embodiment, the upstream side portion of the separation fin 105 functions as a peripheral portion into which the growing water 6 flows, and the peripheral portion is formed so as to taper in the thickness direction so that the growing water 6 resists resistance. may be reduced.

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

In Examples 1 to 4, the shellfish cultured in the aquaculture apparatuses 1 and 10 was explained as mashijimi. can be done.

In addition, in the first embodiment, two aquaculture apparatuses 1, 1 are arranged, but this is not limiting, and a single aquaculture apparatus may be arranged, or a plurality of aquaculture apparatuses may be arranged. . Further, when a plurality of aquaculture apparatuses are arranged, they may be arranged horizontally, or may be arranged vertically in multiple stages in a frame made of metal or wood.

Further, in the first embodiment, the aquaculture apparatuses 1, 1 are arranged outdoors.

Further, in Examples 1 to 4, the aquaculture apparatuses 1 and 10 are installed horizontally, and the recesses 14a and 14b are set to be the lower parts. It may be installed slanted so that the side is low. In this case, the lower portion can be formed in the aquaculture apparatus without forming a recess, and the growing water can flow from the growing water supply portion toward the lower portion.

In Examples 1 to 4, the upper surfaces of the bottom plates 12 of the growth tanks 4a and 4b and the bottom plate 102 of the growth tank 40 are flat. It may be an uneven surface. This makes it easier for eggs or larvae of common clams in the breeding tank to settle on the bottom.

Further, in the first to third embodiments, the shape of the separation fins 15a and 15b is a right-angled triangle when viewed from above, and in the fourth embodiment, the shape of the separation fin 105 is rectangular when viewed from the top. Instead, for example, the edges of the separating fins where the growing water flows may be bent downward. As a result, it is possible to more effectively suppress the generation of eddy currents in the growing water layer below the separation fins, and it is possible to suppress zooplankton from entering the growing water layer below the separation fins. . Also, the projecting width of the separation fins may be changed as appropriate.

In Examples 1 to 3, three rectangular guiding fins 16a to 16c are erected on the upper surface of the separating fin 15a, and three rectangular guiding fins 16d to 16f are erected on the upper surface of the separating fin 15b. However, the number, shape, spacing, etc. of the guide fins may be changed as appropriate.

Further, in Examples 1 to 3, a mode was described in which the separation fins 15a and 15b are fixed in the vicinity of the bases forming the recesses 14a and 14b of the partition walls 13a and 13b, respectively. For example, separation fins extending from one end of the partition wall in the flow direction of the growing water 6 to the other may be fixed in the vicinity of the upper edge of the partition wall without forming a recess in the partition wall.

Further, in Examples 1 to 3, the recess 14a is formed on the downstream side of the partition wall 13a, the recess 14b is formed on the downstream side of the partition wall 13b, and the separation fins 15a and 15b are fixed. Alternatively, a plurality of recesses may be formed in an arbitrary portion of the partition wall, and the separation fin may be fixed to each recess.

Further, in the above-described embodiment, the aquaculture apparatus 1 composed of the cultivating tanks 4a and 4b and the drainage tank 5 has been described. I wish I had. Also, the arrangement of the cultivation tank and the drainage tank in the aquaculture apparatus may be changed as appropriate.

In the third embodiment, the tilt angle of the separation fin is adjusted by the angle adjustment mechanism 18 using the positioning plate portion 18a, the adjustment hole 18b, the pin 18c, and the side wall side adjustment hole 18d. Alternatively, for example, grooves having a plurality of angles may be formed in the side wall of the growth tank, and one side of the separation fin may be inserted into the groove to detachably fix the separation fin. Alternatively, the separation fins formed of a metal plate are fixed near the base of the concave portion of the partition wall by fixing means such as screws, and the inclination angle is adjusted by bending (plastically deforming) the separation fins. good too. Alternatively, a plurality of separation fins whose inclination angles are adjusted in advance may be prepared, and the inclination angles may be adjusted by exchanging the separation fins.

In the above-described embodiment, the side wall of the growth tank extends linearly in the front-rear direction. However, the present invention is not limited to this. good too.

1 Shellfish farming equipment (aquaculture equipment)
2 Growing water supply pool 3 Growing water drainage pool 4a, 4b Growing tank 5 Drainage tank 6 Growing water 7 Zooplankton 8a Mother clam 8b Eggs or larvae 10 Shellfish farming device (farming device)
11a to 11d side wall 12 bottom plate 13a, 13b partition wall 14a, 14b recess (lower portion)
15a, 15b separation fins 16a to 16f guide fins 17a, 17a' side portions (peripheral portions)
18 Angle adjustment mechanism 18a Positioning plate portion 18b Adjustment hole 18c Pin 18d Side wall side adjustment holes 18e and 18f Hinge 21 Supply pipe (supply portion)
40 Growth tank 50 Drainage tank 51 Drainage pipe 51a Drainage ports 101a to 101d Side wall 102 Bottom plate 103 Partition wall 105 Separation fin 501 Drainage pipe 501a Drainage port P Supply pump

Claims (6)

A shellfish farming apparatus for growing shellfish in a growing tank supplied with growing water,
Separation fins protruding toward the growth tank are provided on the peripheral wall of the growth tank and spaced upward from the bottom surface of the growth tank,
An apparatus for cultivating shellfish, wherein the cultivating water overflows the upper surface of the separation fin and flows out of the cultivating tank. The cultivating tank is formed to be long, and a supply part for supplying the cultivating water is provided at one end in the longitudinal direction of the peripheral wall of the cultivating tank, and the other end in the longitudinal direction of the peripheral wall of the cultivating tank is provided. 2. The shellfish aquaculture apparatus according to claim 1, further comprising a lower portion extending downward from an upper edge on one longitudinal end side, and wherein the separation fin is provided in the lower portion. The separation fins are provided on a side wall of the growth tank extending in the direction of flow of the growth water, and the projection width of the separation fins increases from one end in the longitudinal direction of the side wall of the growth tank toward the other end in the longitudinal direction. 3. The apparatus for cultivating shellfish according to claim 1 or 2, characterized in that it is formed as follows. The separation fins are provided on a side wall of the cultivating tank extending in the direction of flow of the cultivating water. 4. The shellfish farming apparatus according to any one of claims 1 to 3, wherein the shellfish farming apparatus is erected on the upper surface of the . 5. The apparatus for cultivating shellfish according to claim 1, wherein the peripheral portion of the separation fin is formed so that the portion into which the growing water flows tapers in the thickness direction. 6. The shellfish aquaculture apparatus according to any one of claims 1 to 5, wherein the separation fins have an angle adjustment mechanism capable of adjusting an inclination angle.

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