JP2007135523A - Method for producing seaweed seed and seedling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a completely new method for producing seaweed seeds and seedlings, which is capable of efficiently raising embryos of various seaweeds as seeds and seedlings. <P>SOLUTION: This method for producing the seaweed seeds and seedlings comprises a process A of preparing a plurality of small block-like seaweed raising substrates which have substantially specific gravity the same as that of seawater and recessed parts on the upper surface, and sowing seaweed embryos on the recessed parts, a process B of arranging the substrates in plane and culturing until the embryos become immatures, a process C of moving the substrates after culturing directly to a water tank in which seawater is put, and culturing the embryo while stirring seawater in the water tank by seawater injection and aeration so as to keep a floating condition of each immature alone, and a process D of attaching the substrates after culturing to a substrate fixing means at certain intervals, and transplanting seaweed seeds and seedlings for seaweed bed creation or putting out offshore seaweed seeds and seedlings for sea level cultivation. The material of the substrate is preferably an ABS resin, and the substrate fixing means is preferably a rope or plastic-made block. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a method for producing seedlings for the purpose of aquaculture of seaweed using a three-dimensional agitation method, and more particularly to a method for efficiently cultivating seedlings of sticky brown algae such as yamatamamok and hondawala as seedlings, It can be applied to the cultivation of brown algae in the ocean and the creation of seaweed beds.

In recent years, demand for brown algae typified by hondawala and arame has been increasing due to its excellent nutritional value, particularly as a health promotion ingredient for modern people. In addition, the algae ground where brown algae flourished has an environmental purification function that absorbs nutrients in seawater. However, the number of algae areas has decreased due to land reclamation. Yes. Conventionally, seedling production has been carried out for the purpose of such aquaculture of brown algae. For example, after spore seeding on a plate-like or string-like base such as a block, stone, rope, net, etc., stationary culture On the other hand, nurturing young seedlings as seedlings has been ongoing. In addition, after the intermediate breeding, the seedlings and seedlings were stuck to a block or the like, and were put out to the natural sea area and cultured.
Examples of the method for cultivating brown algae juveniles include the methods described in Patent Documents 1 to 3 below.
Japanese Patent Laid-Open No. 06-62690 Japanese Patent Laid-Open No. 10-178947 JP 2002-176866 A

The above-mentioned patent document 1 relates to breeding seedlings of brown algae, and this patent document 1 discloses a method of growing seedlings by irradiating and culturing an initial spore body with a certain intensity of ultraviolet rays. Moreover, the said patent document 2 is related with the culture apparatus and culture | cultivation method of a seaweed, and in this patent document 2, it irradiates the light of a specific wavelength to the shoot of the seaweed which adhered on the base | substrate and was culture | cultivated in the stationary state. A method for promoting the growth of young shoots is disclosed. Further, Patent Document 3 relates to aquaculture of seaweed, and Patent Document 3 discloses a method of culturing by forming spore clumps and germinating clumps.

However, since the methods described in Patent Document 1 and Patent Document 2 both perform seedling production on seedling yarn and a base, the fundamental problem of falling into an overcrowded state on the base as seedlings grow There was a problem that could not be resolved. Moreover, although the said patent document 3 is the method of culture | cultivating without using a base | substrate, the complicated process of connecting a spore and forming a clump before culture | cultivation start is required. Moreover, since such an agglomeration is in a state in which a plurality of individuals are closely connected, there is a problem that competition between individuals that most affects the growth and survival of each individual cannot be excluded. Furthermore, this method has a decisive disadvantage that it cannot be applied to seaweeds in which germ cells cannot be connected (for example, seaweeds of the family Hawkidae).

Furthermore, in the following Patent Document 4, as a method for cultivating and growing brown algae seedlings as seedlings and seedlings, a step of seeding brown algae spores or young embryos on a base and culturing them into young seedlings And a step of detaching the juvenile from the base, and a step of transferring the peeled juvenile to the aquarium and culturing while stirring the inside of the aquarium by seawater injection and aeration so as to maintain a floating state of each juvenile alone A method (steric stirring method) has been proposed.
JP 2004-187574 A

However, in seedling production of seaweed using such a three-dimensional agitation method, seedlings grown by the planar growth method are once peeled off from the substrate and grown, so seedlings can be grown at a high density, but they are separated from the substrate Since seeds and seedlings are cultivated in Japan, it was necessary to fix seeds and seedlings on netting grounds and cultivating tools when seedlings were transferred offshore for seedling transplanting and sea surface cultivation for seaweed development.

As described above, in the conventional planar growing method, as the juvenile grows, it becomes gradually overcrowded on the base, and thus there is a problem that the number of individuals is reduced and the growth is poor due to deterioration of light conditions, nutritional conditions and the like. For this reason, there is a problem that the seeds and seedlings in the initial stage have to be offshore to the natural sea area, and therefore there is a high risk of being a target for preying on other organisms such as sea urchins and shellfish, and the survival rate after that is low. It was happening. In addition, when growing even large seedlings in order to improve the survival rate, it is necessary to set the density on the base low in advance, and thus there is a problem that the production efficiency of seedlings per area becomes very poor. Furthermore, since the seedlings that are fixed to the base are taken out to the natural sea area, a large amount of force is required for carrying out and setting the seedlings.

In the current seedling production of seaweed using the three-dimensional agitation method, seedlings grown by the planar growth method are once peeled from the substrate and grown. In this method, seedlings can be grown at a high density, but seedlings are grown away from the substrate. For this reason, it was necessary to fix the seedlings to the netting and growing tools when seedlings were offshore for seedling transplanting for seaweed development and sea surface cultivation.
An object of the present invention is to provide a completely new seedling production method that makes it possible to efficiently nurture any brown algae juveniles as seedlings.

As a result of intensive studies, the present inventors have established young embryos on the surface of a small block-like substrate, grown up to a size of about 1 cm, and developed the whole surface without peeling off the young body. Put it in a water tank and culture it in a state where the substrate floats in seawater (steric stirring culture), then attach the substrate to a string-like or plate-like fixing means and culture seedlings, The present invention has been completed by finding that even smaller seedlings can be transplanted and offshore than when using a net-like breeding tool. Furthermore, when attaching seedlings produced by a conventional method to a net, only seedlings with a plurality of main branches extended can be used, but in the case of the method of the present invention, only one main branch is used. Offshore seaweed seeds and seedlings became possible.

That is, the present invention is a method for producing a seaweed seedling, which method includes the following steps A to D:
Preparing a plurality of small block-shaped seaweed breeding substrates having a specific gravity substantially the same as that of seawater and having an upper surface formed with a recess for allowing seaweed young embryos to settle; Seeding seaweed embryos in the recesses of the substrate; and
Arranging the seaweed breeding substrate seeded with seaweed larvae in the step A in a plane, and culturing the larvae in static culture; and
The seaweed breeding substrate obtained in the step B is transferred to a water tank containing seawater while the seaweed juveniles are fixed, and seawater injection and aeration are performed so that the floating state of each juvenile can be maintained. Step C of culturing the juvenile while stirring in the water tank,
A plurality of seaweed breeding substrates obtained in the step C are attached to the substrate fixing means at a predetermined interval, and transplantation of seaweed seedlings for seaweed basin formation or seaweed seedling seedlings for sea surface cultivation is performed. Process D
It is characterized by including.

  The seaweed seedling production method of the present invention is the method having the above-described characteristics, wherein the seaweed growth substrate is made of acrylonitrile-butadiene-styrene resin, and a linear groove is provided as the concave portion on the upper surface of the seaweed growth substrate. It is also characterized by being.

Furthermore, in the method for producing seaweed seedlings according to the present invention, in the method having the above-described characteristics, the substrate fixing means used in the step D is a rope, and the seaweed breeding substrate is attached to the rope at regular intervals. It is also characterized by being fixed.
In the method for producing seaweed seedlings according to the present invention, the substrate fixing means used in the step D is a concrete block or a plastic block in the method having the above characteristics, and the seaweed growing substrate is formed on the surface of the block. Are fixed and attached at regular intervals.

The production method of the seaweed seedling of the present invention has the advantage of the planar growth method that it is not necessary to fix the seedling at the time of transplantation, and the three-dimensional agitation method that can grow at a high density and is less likely to cause growth failure due to competition between seaweeds ( It is a method that combines the advantages of culturing while providing light irradiation and nutrition under uniform conditions for each young body floating freely in the aquarium. There is an advantage that it can be applied to a kind. Moreover, since the method of the present invention does not require advanced facilities or biotechnology techniques, it is possible to efficiently mass-produce seedlings at low cost. Moreover, according to the method for producing seaweed seedlings of the present invention, even smaller seedlings can be transplanted or offshore compared to the conventional methods using netting or net-like breeding tools. Furthermore, in the conventional method, when attaching seedlings to the netting, only seedlings with a plurality of main branches extended can be used, but in the case of the method of the present invention, seaweed species with only one main branch or You can go offshore in the form of seedlings. That is, the seaweed (Akamok) in a form in which only one main branch (stem) grows was difficult to fix at the time of going offshore even if grown by the conventional three-dimensional stirring method. Since the shape of the seaweed no longer affects the fixation of seedlings when going offshore, the type of seaweed is not limited, and seedling production of all the seaweed seaweeds has become possible.

Each process in the production method of the seaweed seedling of the present invention will be described.
In the first step A, a plurality of small block-shaped seaweed growth substrates having an upper surface formed with recesses for causing seaweed young embryos to grow are prepared. It has substantially the same specific gravity as that of seawater (1.02 to 1.03), or has a specific gravity close to that (for example, 1.00 to 1.05) so that it can be easily stirred therein. In addition, as for the material of the seaweed breeding substrate, any single synthetic resin material or natural material close to the seawater specific gravity, or a combination of multiple materials and adjusting the specific gravity within the above range can be used. Since it is continuously immersed in seawater for several years, it should be unmodified during that time. Further, in order not to attenuate the light hitting the seaweed during the culture with stirring, a colorless and transparent material is preferable, and a material which is easy to perform surface processing is preferable. In the present invention, acrylonitrile-butadiene-styrene resin (specific gravity 1.05) having a specific gravity close to the specific gravity of seawater is mentioned as a preferable material for the seaweed growth substrate. ABS resin is easy to process and has sufficient strength. It has excellent durability and can be recovered after use and reused.

FIG. 1 is a diagram showing an example of the external shape of a seaweed breeding substrate suitable for the method of the present invention. The seaweed breeding substrate 4 in FIG. 1 is made of ABS resin and has a block shape with a size of 1 cm in length × 1.5 cm in width × 1 cm in height. A hole (inner diameter of about 5 mm) penetrating toward is provided. The shape of the through hole is not limited to the circular hole illustrated in FIG. In addition, the appearance of the seaweed growing substrate used in the method of the present invention is not limited to the perforated block-like appearance as shown in FIG. 1, but is a cylindrical or prismatic appearance having no through holes. Even if it is, it may have a structure that is fitted in the side or bottom of the prismatic block body and provided with recesses or protrusions, and it can be attached to concrete or resin block or rope when going offshore As long as it has. The top surface (seaweed agglutination surface) for attaching seaweed only needs to have an area of about 1 cm ² , and when perennial seaweeds are to be agglomerated, the seaweed agglutination surface and substrate of the small-sized substrate should be attached when offshore. A shape in which the surface of the embedded fixture is continuous without a step is preferable.

And in the seaweed growth substrate in this invention, the recessed part for making a seaweed young embryo grow up is formed in the upper surface, The seaweed is centered on the upper surface of the upper surface of the seaweed growth substrate of FIG. Two straight grooves (recesses) are cut so that the young embryos can easily grow. However, in the present invention, the shape and structure of the recess for causing the seaweed young embryos to grow are not limited to this, and for example, formed by adhering a plastic mesh fabric to the upper surface of the seaweed breeding substrate. The recessed part etc. which were made may be sufficient. In general, in the present invention, surface treatment such as grooves, dents, and irregularities having a depth of about 1 mm is applied to the surface of the seaweed so that the seaweed tends to settle. As the surface processing method, there are a method of heat denaturation using a soldering iron or the like, a method of physically damaging using a saw or the like, and a method of attaching an uneven material. When seaweed grows on the edge of the small-sized seaweed growth substrate, there is a risk of damaging the seaweed attachment when attaching the small-sized substrate to another flat fixture. It is preferable to make it grow in the central portion, and surface treatment is basically performed on the central portion. In addition, since other small seaweeds are likely to grow during the growth, it is preferable not to process other than the seaweed growth surface.

In step A in the seaweed seedling production method of the present invention, seedlings of seaweed are seeded in the recesses provided on the top surface of the seaweed breeding substrate. In the case of a seaweed breeding substrate having a through-hole as shown in FIG. A wire having a diameter smaller than the inner diameter of the through hole is prepared, a plurality of seaweed growth substrates are arranged in a straight line, the wire is passed through the through hole, and the seaweed growth substrate in a state where the wire is passed through the aquarium Place them side by side and seed seaweed embryos at the positions of the recesses. When seeding, a dropper is generally used.
The seedlings of seaweed seedlings, for example, in the case of Honda Walla, collect female algal bodies (mother algae) with eggs on the genital floor from the middle of March to early April, which is the maturity period, and put them under running water. Leave it at rest, and after a few days, the eggs fall on the genital floor after they become young embryos (major axis: about 250-300 μm). What was washed with seawater is used.

And in the process B in this invention, the seaweed breeding substrate by which the seaweed young embryo was seed | inoculated by the said process A is arrange | positioned planarly, and it culture | cultivates until it becomes a young body like the conventional general plane breeding method.
In the present invention, the disadvantages of the conventional plane growing method for growing in an outdoor aquarium using commercially available concrete blocks for construction are eliminated, a large-scale facility is not required to obtain a large amount of seedlings, and seaweeds It is difficult to inhibit growth due to competition, and it is not necessary to fix seedlings at the time of transplantation.
The growth conditions can be selected as appropriate depending on the type of seaweed to be grown. The ratio is adjusted to about 2%, and in this state, it is grown for about 2 to 3 months to obtain a juvenile body.

In the next step C, the seaweed breeding substrate in the state where the seaweed larvae flatly cultured in step B are fixed is used as a single substrate unit without leaving the seaweed larvae as they are. Then, after moving into the aquarium containing seawater, the juveniles are cultured at least until the main branches extend while stirring in the aquarium by seawater injection and aeration so as to maintain the floating state of each juvenile alone.
Examples of the water tank (stirring culture apparatus) used in this case include those having a structure as illustrated in FIG. 2, and the water tank 1 in FIG. 2 is a cylindrical water tank (internal volume) made of a transparent member. : About 50 liters), and an air supply unit 3 is provided in the vicinity of the center of the bottom 2 of the aquarium 1, and the seaweed breeding substrate 4 with the seaweed juvenile fixed in the aquarium 1 is aerated by aeration. The entire inside of the water tank 1 is gently stirred. Furthermore, the seawater supply part 5 and the seawater discharge part 6 are provided, and it is comprised so that a young body can be raised under flowing water, pouring water from the upper surface of a water surface. The shape of the bottom portion 2 of the water tank 1 is not particularly limited, but a mortar shape that is inclined in the center direction is desirable in consideration of stirring efficiency by aeration. In addition, in this invention, it is also possible to culture using an aquarium whose internal volume is larger than 50 liters, and the shape of the aquarium is not limited to a cylindrical shape, and may be a cubic shape or a spherical shape. Moreover, it is not restricted to what consists of a completely transparent member, What is necessary is just to use the member which has a light transmittance at least.

The stirring culture conditions are appropriately selected depending on the type of seaweed to be grown, but will be described below by taking the case of Yamamamok as an example.
First, the seaweed growth substrate with the seaweed juvenile obtained in the above-mentioned step B fixed in a water tank filled with seawater is accommodated at a density of 5 to 10 seaweeds / liter, and the relative light intensity is reduced by a light shielding curtain. Stir culture under running water with aeration while adjusting to about 5%. Maintaining such a condition of relative light intensity for a period of time (about 2 months) is that if the relative light intensity is about 10% at an early stage of the juvenile, other algae such as attached diatoms will grow. Because.
In the present invention, in order to prevent growth failure due to competition between seaweeds, the number of seaweed growth substrates per unit volume of seawater (accommodation density) is gradually reduced as the growth of seaweeds increases, and the accommodation density is stepped. It is preferable to stir and culture under reduced conditions (for example, a density of 2 to 3 seaweeds / liter), and the light condition is increased to about 10% relative light intensity according to the growth of seedlings.
Thus, in the method of the present invention, smaller seedlings can be offshore, so that the accommodation density at the end of production becomes higher than that of the conventional three-dimensional stirring method, and the number of production per aquarium increases. Further, even when larger seedlings are required, since the volume ratio of the substrate to the seaweed becomes smaller as the seaweed grows, it can be grown at a storage density similar to that of the conventional three-dimensional stirring method.
In addition, although the water injection conditions in a stirring culture apparatus are not specifically limited, the conditions of 1 rotation / hour (conditions in which the seawater in a water tank is replaced in 1 hour) are preferable so that the water temperature in a water tank is not influenced by the fluctuation | variation of external air conditions. Stirring culture using a culture apparatus is optimally performed in an outdoor facility with a roof where predetermined light conditions can be obtained, but even when there is no roof, it can be performed by adjusting the light conditions with a light-shielding curtain.

In step D of the method for producing seaweed seedlings of the present invention, the plurality of seaweed growing substrates obtained in step C are attached to the substrate fixing means at a predetermined interval, and are attached to the seaweed reefs to attach the seaweed beds. Transplant the seaweed seedlings offshore by transplanting to the establishment site, or by performing sea surface aquaculture, for example, using the middle-level longline method.
In the present invention, a preferred substrate fixing means is a rope. In this case, as shown in FIG. 3, the seaweed growing substrate 4 obtained in the step C is attached to the rope at regular intervals via a plastic attachment member. Generally, the method of attaching to the rope is not limited to that illustrated in the drawings. In addition to the rope, in the present invention, it is also preferable to use a concrete block, a plastic block, or the like as the substrate fixing means. In this case, for example, as shown in FIG. A plurality of substrate accommodating portions for embedding the seaweed growth substrate are provided on the surface of the flat plate body), and the seaweed growing substrate 8 obtained in the step C is embedded in each of the accommodation portions (in FIG. The rod-like body 9 is accommodated in the rod-like body accommodation groove provided on the surface of the block 7 so as to penetrate the through hole provided in the seaweed breeding substrate 8, and both ends of the rod-like body are accommodated. The side is fixed by the fixing tool 10, and the seaweed growing substrate 8 is fixed so that it does not fall off from the block 7 even when going offshore. In addition, the substrate 8 is fixed so that the fixing pin penetrates the block 7 by a fixing pin having a large portion (barbed portion) larger than the inner diameter of the through hole provided in the seaweed growing substrate 8 at the tip of the pin. In the present invention, the structure for fixing the substrate to the block is not particularly limited.
When such a seaweed seedling production method of the present invention is used, a remarkably high survival rate can be obtained even if a rope or block having a seaweed growth substrate fixed thereto is taken out to a natural sea area.

In the method of the present invention, since seaweed is strongly settled on the seaweed growing substrate at the time of step D, the sticking strength after offing is also strong, compared with the seedlings produced by the conventional three-dimensional stirring method. In addition, it is possible to go offshore to the sea area where the waves are stronger.
Also, with regard to the size of seaweed, the conventional three-dimensional agitation method is fixed on the net using a netting or growing tool when going offshore, so it grows on land for a long time until the number of seedling branches grows and grows by two or more. However, in the method of the present invention, since the number and length of branches do not affect the fixing method, it is possible to go offshore regardless of the growth stage of seaweed. Furthermore, in the case of the method of the present invention, since small seedlings can be offshore, the growing period on land is shorter than the conventional three-dimensional agitation method, and the costs related to seedling production can be reduced.

The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the following examples.
[Example 1]
Example of production when the target seaweed species is Yamatamamok As a seaweed growth substrate, a rectangular solid block made of ABS resin with a specific gravity of 1.05 (length 10 mm x width 15 mm x height 10 mm) is prepared, and a through hole with a diameter of 5 mm is provided on the side surface. The surface treatment was performed on the upper surface of the substrate by the following four methods.
Surface processing 1: Two vertical grooves (width 1 mm, depth 0.5 mm) were attached to the center of the block upper surface with a soldering iron.
Surface processing 2: Two horizontal grooves (width 1 mm, depth 1 mm) were attached to the center of the upper surface of the block with a saw.
Surface processing 3: A nylon mesh having a mesh size of 0.8 mm was attached to the entire block upper surface with an adhesive.
Surface processing 4: No surface processing

Then, each of the above four types of seaweed growth substrates (each 200) is arranged in close contact with a through hole provided in the substrate through 40 wires, and 5 rows of substrates aligned through the wire are arranged. It was. Thereafter, Yatsuma Tamoku's young embryos were seeded on the upper surface of each substrate using a dropper (Step A), and planar culture was performed for 71 days with a light-shielding curtain on (Step B).
After the above planar culture, seedlings grew to about 1.5 to 18.2 mm (average 4.9 mm) regardless of the difference in surface processing.
Next, 200 seaweed breeding substrates with grown seedlings attached are removed from the wire and placed in a water tank (internal volume: 50 liters) having the structure shown in FIG. Under the condition of changing, steric stirring was performed for 42 days while the substrate was suspended (Step C). After 42 days of three-dimensional stirring, seedlings grew to 2.5 to 69.2 mm (average 16.7 mm), and the survival rate after 42 days of three-dimensional stirring was 54% in the case of surface processing 1, and surface processing The case of 2 was 55%, the case of surface treatment 3 was 38%, and the case of surface treatment 4 was 17%. This experimental data shows that surface processing (formation of recesses) is required to increase the adhesion of seaweed to the substrate in order to increase the survival rate.
At this time, in order not to cause growth failure due to competition between Yatsuma Tamoku, the seaweed breeding substrate in the aquarium was halved (100 pcs / 50 liters of seawater), and three-dimensional agitation was performed for another month.
Then, the seaweed growing substrate at the end of the three-dimensional agitation was attached to the rope as shown in FIG. 3 and brought out to the natural sea area to carry out sea surface culture. As a result, fully grown Yatsuma Tamoku was obtained (Step D). .

[Example 2]
Example of production when the target seaweed species is Akiyoremoku As the seaweed breeding substrate, the same substrate as in Example 1 (with a through hole having a diameter of 5 mm on the side surface) is prepared, and the top surface of this substrate is soldered with 3 Surface processing was performed with a vertical groove (width 1 mm, depth 0.5 mm).
Then, in the same manner as in Example 1 above, seedlings of Achilleorum larvae were seeded using a dropper (Step A), planar culture was performed (Step B), and using a water tank having the structure shown in FIG. Three-dimensional stirring was performed while the substrate was suspended (Step C).
The seaweed growth substrate at the end of the three-dimensional agitation was attached to a plastic block as shown in FIG. 4 and brought out to the natural sea area to perform sea surface culture. As a result, a sufficiently grown Akiyoremoku was obtained (Step D). .

It is a figure which shows an example of the external appearance shape of the seaweed breeding substrate suitable in the method of this invention. It is a figure which shows an example of the structure of the stirring culture apparatus (water tank) suitable in the method of this invention. It is a figure which shows an example of the attachment state of the seaweed growth substrate to the preferable substrate fixing means (rope) in this invention. It is a figure which shows an example of the attachment state of the seaweed growth substrate to the preferable substrate fixing means (plastic block) in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water tank 2 Bottom part of water tank 3 Air supply part 4 Seaweed growth substrate 5 Seawater supply part 6 Seawater discharge part 7 Block 8 Seaweed growth substrate 9 Rod-like body 10 Fixture

Claims (4)

A method for producing seaweed seedlings, the method comprising the following steps A to D:
Preparing a plurality of small block-shaped seaweed breeding substrates having a specific gravity substantially the same as that of seawater and having an upper surface formed with a recess for allowing seaweed young embryos to settle; Seeding seaweed embryos in the recesses of the substrate; and
Arranging the seaweed breeding substrate seeded with seaweed larvae in the step A in a plane, and culturing the larvae in static culture; and
The seaweed breeding substrate obtained in the step B is transferred to a water tank containing seawater while the seaweed juveniles are fixed, and seawater injection and aeration are performed so that the floating state of each juvenile can be maintained. Step C of culturing the juvenile while stirring in the water tank,
A plurality of seaweed breeding substrates obtained in the step C are attached to the substrate fixing means at a predetermined interval, and transplantation of seaweed seedlings for seaweed basin formation or seaweed seedling seedlings for sea surface cultivation is performed. Process D
And a method for producing a seaweed seedling. The method for producing seaweed seedlings according to claim 1, wherein the seaweed growing substrate is made of acrylonitrile-butadiene-styrene resin, and a linear groove is provided as the recess on the upper surface of the seaweed growing substrate. 3. The seaweed seedling production according to claim 1 or 2, wherein the substrate fixing means used in the step D is a rope, and the seaweed growing substrate is attached and fixed to the rope at a predetermined interval. Method. The substrate fixing means used in the step D is a concrete block or a plastic block, and the seaweed growing substrate is attached and fixed to the surface of the block at a predetermined interval. A method for producing a seaweed seedling according to claim 1.

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