JP6024879B2 - Seaweed culture apparatus and seaweed culture method - Google Patents

Description

  The present invention relates to a seaweed cultivation apparatus and a seaweed cultivation method.

Conventionally, seaweed aquaculture has been performed by marine aquaculture. In marine aquaculture, there is a problem that it is easily affected by fluctuations in seawater temperature and water velocity due to changes in climate weather, and it is difficult to supply seaweed of a certain quality. In addition, there has been concern about the deterioration of the quality of seaweeds due to the influence of seawater pollution in recent years.
In order to stably supply seaweeds without being affected by the sea climate or condition, for example, Patent Literature 1 discloses a seaweed culture device that enables land culture of seaweeds. The seaweed aquaculture device includes a hollow pipe arranged in a substantially vertical direction and a bubble pump installed at the lower end in the middle space, and circulates seawater vertically by bubbles blown from the bubble pump. It is characterized by putting seaweed in the seawater circulation and floating it in the seaweed aquaculture tank. However, as described in Non-Patent Document 1, although it is known that a fast water flow is required for good growth of seaweeds, the device described in Patent Document 1 is limited in increasing the water flow velocity. There was a problem that there was.
Actually, in aquaculture in the open sea, for example, seaweed can be grown up to a total length of about 2 m. However, in a conventional aquaculture device on land, the maximum length is about 1 m.

JP 2002-320426 A

N. Nanba et al. , J. et al. Appl. Physol. 23: 1023-1030 (2011)

  An object of the present invention is to provide a seaweed aquaculture device for cultivating seaweed on land that generates a water flow at a speed higher than the size of the aquarium and enables good growth of seaweed. There is to do. Another object of the present invention is to provide a seaweed cultivation method using the seaweed cultivation apparatus.

In order to solve the above problems, in the present invention, a seaweed aquaculture device provided with a cylindrical aquarium having an opening at the top, an aeration mechanism, a water injection mechanism, a drainage mechanism, and a water flow adjusting mechanism for adjusting the water flow in the water tank The water flow adjusting mechanism is composed of a substantially truncated cone-shaped cylindrical member having openings at the top and bottom, and the cylindrical member has its cone-shaped top opening positioned at the bottom of the cylindrical water tank. The conical bottom opening is located on the upper opening side of the cylindrical aquarium, and the conical central axis is arranged so as to substantially coincide with the central axis of the cylindrical aquarium. The water injection mechanism has a plurality of openings in the vertical direction of the outer peripheral surface, and the water injection mechanism has a water injection port in the vicinity of the inner peripheral edge of the cylindrical water tank, and the water injection direction is substantially tangential to the cross section of the cylindrical water tank. The aeration mechanism is disposed near the outer periphery of the water flow adjustment mechanism at the bottom of the cylindrical water tank. Is, the drainage mechanism, the water inlet is, the tube arranged inside the shape aquarium bottom of the water flow adjustment mechanism, providing seaweed aquaculture and wherein the.
By arranging the water injection mechanism so as to inject water substantially in the tangential direction of the inner periphery of the cylindrical water tank, a water flow can be generated in the circumferential direction inside the water tank. The circumferential water flow can be easily increased by increasing the water injection speed from the water injection mechanism, and has the advantage that the adjustment is simple.
Furthermore, a cylindrical member having a central axis substantially coincident with the central axis of the cylindrical water tank is provided, and an aeration mechanism is provided at the outer lower portion of the cylindrical member, so that a swirling flow in the vertical direction is caused by bubbles generated from the aeration mechanism. And a more complex water flow. Here, if the cylindrical member is, for example, a columnar shape, or if an aeration mechanism is disposed inside the cylinder of the cylindrical member, the grown seaweed tends to be entangled with the cylindrical member. Therefore, by inclining the cylindrical member and further providing an aeration device at the lower part of the outer periphery of the cylindrical member, a vertical swirling flow is generated in the vicinity of the outer peripheral surface of the cylindrical member. Can prevent entanglement of seaweed.
By providing an opening in the vertical direction of the outer peripheral surface of the cylindrical member and providing a water suction port of the drainage mechanism on the bottom of the water tank inside the cylindrical member, the water flow is drained through the cylindrical member. Therefore, the water flow in the circumferential direction is not a simple circular shape, but a spiral shape having a movement toward the shaft portion, which makes the movement of seaweed more extensive and complicated.
In addition, the “vertical direction” in this specification means the vertical direction in the front view (or side view) of the entire apparatus.

  The apex angle of the cone of the cylindrical member of the water flow adjusting mechanism is preferably 5 to 12 degrees. When the apex angle of the cone is 5 to 12 degrees, there is an effect that water flow in the vertical direction is easily generated while preventing seaweed from being entangled. Here, the “vertical angle” refers to the intersection angle (θ2 in FIG. 4) between the central axis of the cone and the ridge line from the apex on the outer peripheral surface toward the bottom surface. If the truncated cone is other than a cone, the apex angle (θ2) is the largest value.

  It is preferable that the opening of the cylindrical member of the water flow adjusting mechanism has an average diameter of 1.0 to 10 mm and an opening ratio with respect to the outer peripheral surface of the cylindrical member of 0.5 to 3%. By making the average diameter and the open area ratio of the holes within the above ranges, it is difficult for the seaweeds before the growth to pass through the tubular member and the drainage efficiency is not easily hindered.

  The seaweed cultivation method of the present invention is characterized in that seaweeds are grown using any of the above-described seaweed cultivation apparatuses. By using the seaweed aquaculture apparatus, high-quality seaweed can be efficiently grown.

  In the seaweed cultivation method of the present invention, it is preferable to grow seaweeds under conditions of a water flow rate of 13 to 25 cm / second. Higher quality seaweed can be cultivated by culturing seaweeds under water flow conditions comparable to the open sea as described above. Here, the “water flow velocity” refers to a water flow velocity measured at a position of 10% in the height direction from the bottom surface in the water tank and 10% in the radial direction from the outer wall.

  It is preferable that the water level in the cylindrical water tank is lower than the height of the water flow adjusting mechanism. By making the water level lower than the water flow adjusting mechanism, it is possible to more reliably generate convection in the vertical direction of water. In this specification, “height” refers to the length in the vertical direction in the front view (or side view) of the apparatus.

  According to the present invention, there is provided a seaweed aquaculture device for cultivating seaweed on land that generates a water flow at a speed higher than the size of an aquarium and enables good growth of seaweed. It is possible. Moreover, according to this invention, the seaweed cultivation method using this seaweed cultivation apparatus can be provided.

It is a front view of one Embodiment of the seaweed culture apparatus of this invention. It is a front fragmentary view which shows the installation position of the water injection mechanism in one Embodiment of the seaweed culture apparatus of this invention. It is a top view of one Embodiment of the apparatus for seaweed cultivation of this invention. It is a front view which shows the structure of the water flow adjustment mechanism in one Embodiment of the seaweed culture apparatus of this invention. It is a graph which shows the total weight change of the macomb in the culture of the macomb of Example 1. It is a graph which shows the difference in the growth speed of the seaweed in the water tank for a comparison and the water tank of an example in the cultivation of seaweed of Example 2. It is a front view which shows the comparative example of the apparatus for seaweed cultivation. It is a top view which shows the comparative example of the apparatus for seaweed cultivation.

Hereinafter, the seaweed cultivation apparatus and the seaweed cultivation method of the present invention will be exemplarily described based on the drawings.
The apparatus for aquaculture of seaweed of the present invention comprises a cylindrical aquarium having an opening at the top, an aeration mechanism, a water injection mechanism, a drainage mechanism, a water flow adjustment mechanism for adjusting the water flow in the aquarium, and a light irradiation mechanism as necessary Prepare.

<Seaweed aquaculture equipment>
(Tubular tank)
As the main body of the seaweed aquaculture apparatus 1 of FIG. 1, a bottomed cylindrical aquarium having an opening at the top, preferably a cylindrical aquarium 2, is used. The material of the cylindrical water tank 2 is not particularly limited as long as it is a member capable of holding water therein, and any glass, resin, etc. can be used, but it is resistant to impacts and has high transparency. For this reason, polycarbonate, acrylic and the like can be suitably used. Since a certain amount of light is required for good growth of seaweeds, it is preferable to use a transparent, particularly colorless, transparent member so that external light can be taken in more efficiently.

  The size of the cylindrical aquarium is not particularly limited and can be determined according to the size of the seaweeds that you want to grow, but in order to grow larger seaweeds, use a larger aquarium. Is preferred. In particular, those having a capacity of 1000 L or more and about 1000 to 3000 L can be suitably used. Specifically, a water tank whose radial inner dimension is larger than the vertical inner dimension can be used. In a 2000 L water tank, the radial inner dimension is 1800 to 2200 mm, particularly 1900 to 2000 mm, the vertical inner dimension is 800 to 1000 mm, Particularly, those having a thickness of 850 to 950 mm can be preferably used.

(Water injection mechanism)
An example of the water injection mechanism is a water injection pipe 3 as shown in FIG. The water injection port 4 of the water injection pipe 3 may be arranged anywhere in the vertical direction of the cylindrical water tank 2, and in the vertical direction of the cylindrical water tank 2 in FIG. 1 and FIG. Although arranged near the opening, it may be arranged near the center in the vertical direction as shown in FIG. 2B and near the bottom as shown in FIG. Preferably, it arrange | positions near the upper opening of the cylindrical water tank 2 with easy arrangement | positioning.

As shown in FIG. 3, when the seaweed cultivation apparatus is viewed from above, the water injection pipe 3 is arranged such that the water injection port 4 injects water in a substantially tangential direction of the inner periphery of the water tank. Water injection in the “substantially tangential direction of the inner circumference of the water tank” requires that at least a substantially circular water flow is generated when viewed from above in the water tank. Specifically, a line ab indicating the water injection direction in the figure The angle θ1 formed with the radial direction cd line is preferably 60 to 120 degrees, particularly 70 to 110 degrees, and more preferably 80 to 110 degrees. The most preferable angle θ1 is 90 degrees as shown in FIG.
The water injection direction may be obliquely upward or obliquely downward as long as it is not upward or downward as viewed from the side of the water tank, but is most preferably horizontal.

  For example, in the case of the above 2000L water tank, the amount of water injected from the water inlet 4 is 40 to 80 L / min, particularly 50 to 80 L / min, and further 60 to 70 L / min, that is, 2 to 4% of the water tank capacity, especially 2 5 to 4%, more preferably 3 to 3.5%. If the amount of water injection is too large, overflow from the water tank tends to occur, and if it is too small, it becomes difficult to achieve a desired water flow rate suitable for the growth of seaweeds.

  The material of the water injection pipe 3 is not particularly limited, but it is preferable that the water injection pipe 3 is not easily corroded in contact with water, particularly seawater, and is not easily affected by physical impact or deformation. It is preferable to have moderate flexibility. Specific examples include polyvinyl chloride, acrylic, and polycarbonate.

(Water flow adjustment mechanism)
As the water flow adjusting mechanism, a cylindrical body 5 which is a substantially truncated cone-shaped, preferably substantially truncated cone-shaped tubular member is disposed. In FIG. 1, the outer peripheral surface of the cylindrical body 5 is linear when viewed from the front, but may be curved or wavy as long as it has a substantially truncated cone shape as a whole (FIG. 1). Not shown). It is preferable that the cylindrical body 5 is made of a material that hardly corrodes in contact with water, particularly seawater. Specific examples include polyvinyl chloride, acrylic, and polycarbonate. In addition, the cylindrical body 5 is preferably transparent, particularly colorless and transparent, in order to facilitate light transmission. The cylindrical body 5 is arranged so that the cone-shaped bottom part is on the water tank upper side and the cone-shaped top part is on the water tank bottom side.

  In FIG. 4, it is preferable that the apex angle θ2 of the cone forming the cylindrical body 5 is 2.5 to 15 degrees, particularly 3 to 12.5 degrees, and more preferably 5 to 12 degrees. If the apex angle θ2 is too large, the speed of the water flow generated by the aeration mechanism described later is difficult to increase, and if it is too small, there arises a problem that seaweeds are likely to get entangled with the cylindrical body 5.

The cylindrical body 5 has a plurality of apertures 6 in the vertical direction, preferably over the entire vertical direction. By providing the opening 6 in the cylindrical body 5, seawater inside the water tank passes through the cylindrical body 5 and is drained. It is preferable that each diameter of the opening 6 is 1 to 10 mm, particularly 2 to 8 mm, and further 3 to 5 mm. Further, the hole area ratio of the cylindrical body 5 is preferably 0.5 to 3.0 %, particularly preferably 0.7 to 2.5 %, and more preferably 1.0 to 2.0 %. By setting the diameter of the opening to 1 to 10 mm, the drainage efficiency through the drainage mechanism described later is hardly hindered, and even if the seaweed before growth is suspended in the aquarium 1, the seaweed is cylindrical. It is difficult to penetrate the body 5. In addition, by setting the hole area ratio to 0.5 to 3.0 %, drainage efficiency through a drainage mechanism described later is hardly hindered, and a water flow generated by an aeration mechanism described later is transmitted into the cylindrical body 5. Hard to do.

  The height of the cylindrical body 5 is preferably 70 to 97%, particularly 85 to 95%, more preferably 87 to 92.5% of the height of the cylindrical water tank 2. By setting it as said height, the performance of a water flow adjustment mechanism can fully be demonstrated, and generation | occurrence | production of the up-down direction of water can be made more reliable.

(Aeration mechanism)
Any commonly used aeration mechanism can be used, and examples thereof include an air stone 7 connected to an external air pump (not shown) and a tube (not shown). Preferably, it is difficult to cause corrosion by seawater. The air stone 7 is disposed near the outer periphery of the cylindrical body 5 and in the lower part of the water tank 2. In the present specification, the “lower part” of the water tank 2 refers to a position of 0 to 1/3 upward from the bottom surface, where 1 is the height from the bottom surface of the water tank to the upper surface. Here, the air stone 7 is preferably arranged at a position of 0 to 1/5, particularly 0 to 1/10 from the bottom in the lower part of the water tank, and is arranged at a position of 0, that is, the bottom. Is most preferred. Further, “near the outer periphery” of the cylindrical body 5 specifically means that the radial distance between the outer peripheral surface of the cylindrical body and the inner peripheral surface of the aquarium is 1 from the outer peripheral surface of the cylindrical body in the radial direction. It shall refer to the 1/3 position. Here, the air stone 7 is preferably disposed in the vicinity of the outer periphery of the cylindrical body 5 at a position of 0 to 1/5, particularly 0 to 1/10 in the radial direction from the outer peripheral surface of the cylindrical body. Is most preferably disposed adjacent to the outer peripheral surface of the cylindrical body.

  The supply amount of the aeration mechanism is 60 L / min or more, preferably 60 to 300 L / min, and more preferably 120 to 200 L / min. By using the above air supply amount, a swirling flow in the vertical direction is generated in the water tank, and it becomes possible to generate a complicated flow like the open sea in combination with the water flow in the circumferential direction.

(Drainage mechanism)
The drainage mechanism has a structure in which a water inlet 8 is arranged inside the cylindrical body 5 at the bottom of the water tank 2. By disposing the water inlet 8 inside the cylindrical body 5, the water is drained through the cylindrical body 5, whereby the water flow is combined with the circumferential water flow to form a spiral shape. It is easy to become. Thereby, it becomes easy to produce the complicated water flow similar to the open sea further.

  The drainage mechanism is preferably connected to the water inlet 8 by a pipe 9 made of a material having moderate flexibility, which is not easily corroded by seawater such as vinyl chloride, polyethylene, polycarbonate, and acrylic. By arranging the pipe 9 outside the water tank in a siphon shape, the water level in the water tank can be kept constant. That is, by making the highest level of the piping the same height as the desired water tank water level.

(Light irradiation mechanism)
Irradiation of light above a certain level is essential for the growth of seaweeds. The seaweed aquaculture apparatus of the present invention is preferably installed in an environment in which external light can be easily taken. However, in order to prepare for insufficient illuminance caused by weather or the like, it is preferable to further include a light irradiation mechanism (not shown). As the light irradiation mechanism, generally available fluorescent lamps, incandescent lamps, LEDs and the like can be suitably used, and a structure in which light is irradiated from the upper part of the apparatus is preferable. It is preferable that the light is set so as to be irradiated for at least 12 hours in one day without distinguishing between natural light and artificial light.
Preferably, an illuminometer is installed in the vicinity of the apparatus, and the light irradiation mechanism is automatically activated when the illuminance falls below a certain level. Specifically, it is preferable to set the lower illuminance lower limit of light irradiated on the water surface of the apparatus 1 to 5000 to 10000 lux.

<Seaweed aquaculture method>
The seaweed cultivation method of the present invention is characterized by using the seaweed cultivation apparatus 1 described above. The seaweed aquaculture device 1 is preferably installed indoors so that it is not easily affected by the weather or outside temperature. However, since it is desired to irradiate as much light as possible as described later, it is preferable to install in an environment where natural light can be taken.

  Seawater is poured into the cylindrical water tank 2 of the seaweed aquaculture device 1 through the water injection pipe 3. Seawater is preferably sterilized in advance with a membrane filter, ultraviolet irradiation, or the like. The membrane filter used here is preferably made of a hydrophilic material, and is preferably made of cellulose acetate, hydrophilic PTFE, polyester nonwoven fabric coated with cellulose acetate, or the like, and the pore size of the membrane filter is 0.4-1. The thing of 2 micrometers, especially 0.5-1 micrometer can be used conveniently. The membrane filter may be installed in the middle of the water injection path of the water injection pipe 3.

  When the water level of the seawater in the cylindrical water tank 2 reaches a desired water level, drainage through the pipe 9 is performed, and the water level in the water tank is kept constant. Here, it is preferable to make the water level in the cylindrical water tank 2 higher within a range not exceeding the upper end of the cylindrical body 5. As described above, the amount of water injected from the water injection port 4 of the water injection pipe 3 is preferably 60 to 70 L / min. Water from the water injection port 4 is injected in a direction that forms an angle θ1 (preferably 80 to 110 degrees as described above) of FIG. Create a water stream. In addition to this, since seawater is discharged from the water inlet 8 through the opening 6 of the cylindrical body 5, a water flow in the radial direction is also generated, so the circumferential water flow and the radial water flow are combined. Thus, a spiral water flow is generated as shown by the dashed arrows in FIG.

  Further, air is injected upward from the air stone 7 connected to the air pump through a tube at a supply amount of 3 to 5 L / min as described above with respect to the seawater in the water tank. The air from the air stone 7 rises above the water tank along the outer wall of the truncated cone-shaped cylindrical body 5, and at that time, convection of water as shown by broken line arrows in FIG. 1 occurs.

  The velocity of the water flow generated by the water injection pipe 3, the cylindrical body 5 and the air stone 7 is preferably 10 cm / second or more, particularly 12 to 30 cm / second, and more preferably 13 to 25 cm / second. This water flow velocity refers to the water flow velocity at a position of about 20 cm from the bottom surface in the water tank 2 and about 20 cm from the outer wall. This water flow velocity can be achieved especially by making the water tank as large as about 2000L. By setting it as said water flow, even if it is in a land water tank, it can be set as the water flow state near the environment of an open sea. In addition, if the water flow rate is too low, microalgae are likely to adhere to the inner wall of the aquarium, and if left untreated, the amount of light entering the aquarium is limited, which may slow the growth rate of seaweeds. Therefore, frequent cleaning of the water tank was necessary. However, by using the above water flow, the high water flow speed makes it difficult for microalgae to adhere to the inner wall, and the number of cleanings can be greatly reduced.

  After the water flow velocity in the water tank 2 reaches a desired water flow velocity, seeds of seaweed to be cultivated are put into the water tank 2. The seaweed to be cultivated is not particularly limited as long as it can grow under floating conditions. In particular, macaques, seaweeds, cypresses, hornworms and the like can be suitably used. For preparing seedlings, any method known to those skilled in the art may be used. In the water tank 2, the density of the seedlings to be introduced is preferably 250 strains / L or less, particularly 60 to 200 strains / L, and more preferably 80 to 150 strains / L. If the density of the seedlings is too high, the seaweeds after growth may be entangled with each other or may block external light, and this may cause the growth rate of each individual to be slow.

Even after seedlings are introduced, the above water flow rate is maintained and seedlings are grown under floating conditions. At that time, it is preferable to irradiate the seedling with as much light as possible. Therefore, it is preferable to operate the seaweed aquaculture device 1 under conditions that allow natural light to be taken in. Moreover, when there is little light irradiated to the apparatus 1 by the weather, it is preferable to irradiate light by a light irradiation mechanism (not shown).
Here, the illuminance of light irradiated on the water surface of the apparatus 1 is preferably 5000 lux or more, particularly 5000 to 40000 lux, and more preferably 10000 to 40000 lux.

  It is preferable to set the water temperature in the aquarium to an optimum temperature for growing seaweeds. For example, in the case of macombu, it is preferably 5 to 12 degrees, and in the case of seaweed, it is preferably 6 to 15 degrees. In addition, in order to maintain said optimal temperature, you may install a heating apparatus and / or a cooling device in a water tank.

When seedlings are grown under the above-mentioned culture conditions and the seaweed becomes a desired size (weight) or more, the water injection from the water injection pipe 3 and the air supply from the air stone 7 are stopped, and the grown seaweed is to recover.
Due to the water flow comparable to the open sea and a sufficient amount of light irradiation, the growth rate of seaweeds is very fast compared to conventional aquaculture equipment.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

(Preparation of equipment)
Airstone for aeration around the drain outlet of a 2000L polycarbonate transparent cylindrical water tank (SPS-2000, Earth Co., Ltd.) with a drain outlet in the center (Part No .: Round Series 50φ Round # 100, manufactured by King Whetstone Co., Ltd.) 8) were installed as shown in FIG. A plastic truncated conical cylindrical body was attached to the center bottom of the aquarium so that the bottom of the cone was arranged at the top. The height of the cylindrical body was 90% of the height of the water tank, and the apex angle of the cylindrical body was 10 degrees. Openings having a diameter of 3 mm were formed at intervals of 3 cm on the outer peripheral surface of the cylindrical body (aperture ratio 0.8%).

  Seawater is filtered through a membrane filter (material: polyester non-woven fabric, pore size: 0.3 to 0.65 μm, manufactured by ADVANTEC), and an ultraviolet sterilizer (product number: FDL-2-SP, manufactured by Chiyoda Corporation) is used. Used to sterilize. Sterilized seawater was injected into the water tank from the spout of the water injection pipe at a rate of 60 ± 5 L / min. The direction of water injection from the water outlet was 90 ± 2 degrees with respect to the radial direction of the cylindrical water tank.

  Piping made of vinyl chloride for drainage was arranged in a siphon shape outside the water tank so that the water level in the water tank was 90 to 92% of the height of the water tank.

  The aquarium was installed in a place where the sunlight in the room was easily hit so that the illuminance would average 30000 lux on a clear day. When the weather worsened, the light of the fluorescent lamp was irradiated, and the illuminance of the light hitting the water surface of the aquarium was set to be at least 10,000 lux. The light irradiation time was 12 hours or more per day, and the light was turned off at night.

(Example 1: Aquaculture of Macombu)
Macombu seedlings prepared by a conventional method were removed from the seedling substrate after the algal body length became 2 cm or more, and 30 individuals were put into a water tank. After the algal body length became 10 cm or more, punching labeling was performed on the algal body by a conventional method. Thirty individuals were collected on the 7th, 16th and 24th days after the start of the cultivation, and the algal body length, the growth rate (calculated from the moving distance of the punching label) and the weight were measured. As a result of cultivation for 24 days, the algal body weight increased from 395 g to 4339 g by about 11 times, the daily growth amount was about 89 g / day, and the growth rate was about 2.9 cm / day. The change in the total weight up to 25 days is shown in FIG. The water temperature during the cultivation was 3.9 to 10.6 ° C. In the water tank of the present invention, it was confirmed that macombu grows well without being entangled in the water tank.

(Example 2: aquaculture of seaweed)
The wakame seedlings prepared by the usual method were removed from the seedling substrate after the alga body length became 10 cm or more, and punched labels were applied to the algae by the usual method, and then put into the water tank (Example water tank) of the present invention. Full length and growth rate were measured at a rate of once every 5-6 days. The water temperature during cultivation was 3.9 to 10.6 ° C. The growth rate per day is shown in FIG.

  As a comparative example, a test similar to the above was performed using the following comparative water tank. The structure of the comparative water tank is shown in FIGS. In the comparative water tank, the cylindrical body 5 was not a truncated cone shape but a cylindrical shape, and the outer peripheral surface was a mesh shape (FIG. 7). In addition, water injection was performed in the vertical direction from the top of the water tank 2. The water flow rate of the comparative water tank was 9.1 to 11.3 cm / second. The water temperature during cultivation was 3.9 to 10.6 ° C. The growth rate per day of seaweed cultivated in the comparative water tank is also shown in FIG.

  As shown in FIG. 6, in the cultivation of seaweed, it was shown that the growth rate was faster in the example water tank than in the comparative water tank.

  The seaweed cultivation apparatus and the seaweed cultivation method of the present invention can be suitably used for the cultivation of seaweeds used for foods and the like.

DESCRIPTION OF SYMBOLS 1 ... Seaweed culture apparatus, 2 ... Cylindrical water tank (tubular water tank), 3 ... Water injection pipe (water injection mechanism), 4 ... Water injection port, 5 ... Cylindrical body (cylindrical member), 6 ... Open hole, 7 ... air stone (aeration mechanism), 8 ... water inlet, 9 ... piping.

Claims (6)

A seaweed aquaculture device equipped with a cylindrical aquarium having an opening at the top, an aeration mechanism, a water injection mechanism, a drainage mechanism, and a water flow adjustment mechanism for adjusting the water flow in the water tank,
The water flow adjusting mechanism is formed of a substantially truncated cone-shaped cylindrical member having openings at the top and bottom, and the cylindrical member has a cone-shaped top opening located at the bottom of the cylindrical water tank. The shape bottom opening is located on the upper opening side of the cylindrical aquarium, and the conical central axis thereof is arranged so as to substantially coincide with the central axis of the cylindrical aquarium,
The cylindrical member has a plurality of openings in the vertical direction of its outer peripheral surface,
The water injection mechanism is arranged so that the water injection port is in the vicinity of the inner peripheral edge of the cylindrical water tank, and the water injection direction is a substantially tangential direction of the cylinder cross section,
The aeration mechanism is arranged near the outer periphery of the water flow adjustment mechanism at the bottom of the cylindrical water tank,
The drainage mechanism has its water inlet arranged inside the water flow adjustment mechanism at the bottom of the cylindrical water tank,
An apparatus for aquaculture of seaweeds characterized by that.   The seaweed aquaculture apparatus according to claim 1, wherein a cone-shaped apex angle of the cylindrical member of the water flow adjusting mechanism is 2.5 to 15 degrees.   The opening of the cylindrical member of the water flow adjusting mechanism has an average diameter of 1.0 to 10 mm, and an opening ratio with respect to the outer peripheral surface of the cylindrical member is 0.5 to 3%. Seaweed aquaculture equipment.   The seaweed cultivation method characterized by growing seaweed using the seaweed cultivation apparatus of any one of Claims 1-3.   The seaweed cultivation method according to claim 4, wherein the seaweed is grown under conditions of a water flow rate of 13 to 25 cm / sec. The seaweed cultivation method according to claim 4, wherein a water level in the cylindrical water tank is lower than a height of the cylindrical member of the water flow adjusting mechanism.

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