JP2000166409A - Production of resource marine alga - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently producing a marine alga of the family Laminariaceae usable as a feed for fish and shellfish such as abalone or Turbo cornutus and a resource for a chemical raw material. SOLUTION: Immatures of Ecklonia stolonifera belonging to the genus Laminariales of the family Laminariaceae deposited on a culture net 6 are raised in fixed culture facilities until the immatures become adults. The culture net 6 is pulled up on the sea. Foliate parts 11 are reaped with leaving creeping root parts 13 of Ecklonia stolonifera and used as a resource marine alga. When the culture net 6 from which the foliate parts 11 are reaped is returned to the sea, foliate parts 11 are reproduced after the lapse of a fixed period and the foliate parts 11 can be repeatedly collected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an efficient production technique of seaweed marine algae which can be used as a feed for cultivation of useful fish and shellfish such as abalone, turban shell and the like, and as a resource of chemical raw materials.

[0002]

2. Description of the Related Art Large seaweeds of the family Laminariaceae, such as alame and swordfish, are extremely important food resources for algae-eating aquatic animals such as abalone, turtle and sea urchin. In recent years, with the development of seed and seedling production techniques for these useful fish and shellfishes, it has been required to secure a whole year of feed seaweed for aquaculture, and the need for increased culture of seaweed has been rapidly increasing. In addition, the kelp seaweed contains a large amount of sodium alginate used as a raw material for cosmetics and as a food additive, and is therefore in great demand as a resource seaweed.

[0003] Conventionally, cultivation of seaweed marine algae is generally carried out by rope cultivation, which is widely practiced in kelp or wakame. In this cultivation method, young seaweeds are grown on a thin twisted thread made of synthetic fiber called seed seedlings in a water tank on land in advance, and this seedling seedling is attached to a thick rope called a trunk rope and stretched horizontally in the sea. In this method, seaweed larvae are grown by a long-line method or a goodwill method in which a large number of thin hanging ropes are lowered from a horizontally stretched trunk line and seedlings are attached to each of them (Japanese Patent No. 2587673). , JP-A-9-224510, JP-A-7-63, etc.). Then, after breeding to the required size, the trunk is pulled up to the sea and seaweed is collected. When the cut seaweed is used as a feed for aquaculture, it is used after being shade-dried until the feeding-inhibiting active substances such as florothannin contained in the alga body are reduced.

[0004]

By the way, in the cultivation of the seaweed, which has been performed so far, the leaf-shaped portion is not regenerated from the remaining portion obtained by cutting the leaf-shaped portion. The same work had to be repeated from the seedling collection to temporary planting in the open sea and main training, and there was a limit in reducing the production cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide an efficient production method capable of inexpensively obtaining seaweed resources of the family Laminariaceae, which are used as feed and chemical raw materials. That is the purpose.

[0006]

Means for Solving the Problems The present applicant has conducted a number of experiments on the ecology of seaweed and the like, and as a result,
The present inventor has found that a certain kind of seaweed regenerates a leaf-shaped portion even in a state where only the root portion is removed from the leaf-shaped portion, and arrived at the present invention.

[0007] That is, the method for producing a resource seaweed according to the present invention is a method for producing seaweed (Ecklo) belonging to the family Laminariaceae.
nia stolonifera) is grown on a culture substrate having an appropriate shape and grown in the sea until a required size is reached, and then the leaf-like portion cut off leaving a creeping root portion for leaf-like regeneration is used as a resource seaweed. And Tiger alame has a great difference in the form of the foliate part due to its own fabric, but all propagate in the crawling root, and have the character that the foliate part regenerates even in the state of only the crawling root, and also other kelp seaweed. It can also be used for feed and chemical raw materials. Note that, when cutting the leaf-like portion of the persimmon as feed seaweed, the stem-like portion may be left as it is or cut off together. In addition, in a single strain of vine, which is connected by a creeping root, it is effective to promote the regeneration of the leaf-like portion by leaving the leaf-like portion at a fixed rate without cutting off all of the leaf-like portion.

[0008] In the above production method, the cutting of the foliage of the ivy is carried out by raising the cultured substrate to the sea, and returning the cultured substrate having the crawling root portion to the sea again. After that, the leaf is regenerated. If a facility is set up, it is only necessary to repeat sampling at sea, and the productivity will be greatly improved as compared with conventional aquaculture methods.

Further, if a string-like body such as a rope or a hose with a seedling thread attached thereto is used as a culture base, a long-line or goodwill-type culture facility conventionally used for cultivation of sea kelp seaweed can be used as it is. It is convenient without special equipment.

[0010] The culture substrate is not limited to the above-mentioned type that is stretched in the sea and pulled up at any time, but may be a concrete structure installed on the sea floor. In this case, the breeding floor is fixed and does not move.Therefore, good growth conditions are secured with little falling off or erosion of the algae by rocking like a rope system, and stable cultivation that is hardly affected by the weather At the same time, zoospores released from mature seaweed can allow the vine to grow around the structure.

[0011] Further, if algae paint is applied to the surface of the concrete structure, it is convenient for growing.
As the algae nourishing paint, a paint containing a general chemical fertilizer may be used. Among them, a photosynthetic bacterium proposed by the present applicant, a carrier using porous particles, and a water environment improving paint comprising a nutrient component of the photosynthetic bacterium are proposed. (See JP-A-5-247378) is particularly preferred. When this paint is applied, nutrients necessary for the growth of tiger algae can be stably supplied over a long period of time, helping the formation of zoospores, which greatly contributes to an improvement in productivity of the resource seaweed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory diagram of a goodwill type aquaculture facility 1 used in the method for producing a resource seaweed according to the present invention. In this aquaculture facility 1, a large number of aquaculture ropes 6 as aquaculture bases each having a weight 5 attached to the tip thereof are attached to a trunk rope 4 stretched horizontally in the sea via a float 2 and a concrete block 3 at a predetermined interval. It is configured to be placed and hung. In addition, the float 2 and the trunk line 4 are connected by a float line 7, and both ends of the trunk line 4 and the concrete block 3 are connected by an anchor line 8, thereby being held at a predetermined position in the sea. I have.

FIG. 2 is an enlarged view of the cultivation line 6, and the seedling 9 that has been temporarily planted is sandwiched between the twists of the cultivation line 6. This seedling thread 9 is produced in the same procedure as the method for collecting seedlings of other seaweeds. That is, a seedling thread such as Cremona (trade name) is immersed in an aquarium in which zoospores of vines float, and zoospores are attached thereto, and then transferred to a culture aquarium filled with clean seawater to germinate. And cultivate until the young body 10. Thereafter, the seed and seedlings 9 are transferred into the sea and provisionally planted in the open sea to prepare for main training. Then, the seed and seedlings 9 for which the temporary planting has been completed are cut into appropriate lengths and inserted into the culture line 6 at predetermined intervals. The seedlings 9 may be spirally wound around the entire length of the cultivation line 6 without being cut.

An adult 11 of the tiger algae grown in the aquaculture facility 1 is pulled up from the cultivation line 6 to the sea and cut at an appropriate position of the stalk 12 as shown in FIG. Used for food, etc. Then, when the cultured rope 6 from which the leaf-shaped portion has been cut is returned to the sea, the leaf-shaped portion appears again from the remaining creeping root portion 13, and after a lapse of a predetermined time, it becomes an adult 11 of a pearl lam and can be collected again. As described above, according to the method of the present invention, when the aquaculture facility 1 is first installed, the leaf-like portion of the vine, which can be used as a feed or a chemical raw material, can be collected many times with the same facility. Has the advantage that it is cheaper than other seaweeds.

In the above-described embodiment, an example has been described in which the aquaculture base is pulled up when the resource seaweed is collected.
As shown in FIG. 4, the culture base may be a concrete structure installed on the sea floor. The culture substrate 20 has a plurality of pillars 22 erected at predetermined intervals on the upper surface of a block-shaped substrate 21, and algae paint is applied to the surface of each member. Then, hook-shaped metal fittings 24, 24 are connected to both ends of an aquaculture cord 23 with a juvenile similar to the aquaculture cord used in the above-described embodiment, and these are attached to the base 21 near the top of the pillar 22 of the aquaculture base 20 and its base. Are respectively hooked to the inverted U-shaped fittings 25, 25 implanted on the upper surface of the device, and are fixed detachably. The concrete structure 20 as the culture base is laid in a predetermined sea area, and after a lapse of a predetermined time period, the vine alame 26 becomes an adult, and its leaf-like portion can be collected. In collecting the leaf-shaped portion, in addition to the method in which the diver dives into the sea and cuts the leaf-shaped portion in this state, the cultivation line 23 may be removed from the concrete structure 20 and pulled up to the sea before cutting.

In the above embodiment, the vine clam extends the creeping root, and new leaf-like portions are extended from the places to sequentially spread on the surface of the concrete structure 20. Since the vines 26 can grow around the concrete structure 20, an increase in the yield can be expected. In this case, when there is no thing suitable for the growth of seaweed such as a rock reef around the concrete structure 20, it is good to lay abandoned stone and use it for the breeding floor. When the concrete structure 20 on which the pillars 22 are erected is used as the culture base,
The amount of aquaculture per unit area can be increased, and the ocean current changes near the column 22 installed on the sea floor,
Since the upwelling flow from the lower part of the column 22 to the upper part is easy to occur, oxygen and nutrients are evenly distributed, and the rocking method does not oscillate as in the above-mentioned rope culture method. can get.

In the second embodiment, when the larvae of vines are first introduced into the cultivation facility, the cultivation line 23 on which the larvae have set is attached to the cultivation base 20 as it is, as shown in FIG. The carrier 30 may be used.
The carrier 30 is formed in a substantially annular shape by a synthetic resin having a suitable elasticity, and a plurality of L-shaped hooks 31 for hanging a culture line 34 are provided on an outer peripheral surface thereof at intervals. The ring state can be maintained by the hooks 32 provided at both end portions and the hooks 33 engaged with the hooks 32. Then, an aquaculture line 34 on which a young vine of a tiger larva has set is inserted into the hook portion 31 of the carrier 30 and, in this state, a concrete structure 3 which is a culturing base and is similar to the above-described embodiment.
6 is fitted to the column 37. This carrier 30 not only facilitates the attachment of the culture line 34 to the culture substrate 36 having the above-mentioned shape, but also is different from the seaweed culture such as a tetrapod (trade name) or a parallel reef formed in a lattice frame shape. It can be easily attached to an existing or new structure used for the purpose of the above, and it is convenient to use it as a culture base of the resource seaweed.

[0018] As described above, in the culture substrate installed on the seabed, the vine is gradually spread over the culture substrate due to its crawling root, and further grows and matures there, and releases zoospores around the culture substrate. The vines will also thrive, leading to an increase in cultivated area.

In each of the above-described embodiments, a case has been described in which the seedlings and the cultivation line are used as a means for introducing the vines to the cultivation facility when starting the cultivation. However, this may be changed to another method. Alternatively, various modifications within the technical concept of the present invention, such as changing the shape of the culture substrate used therein, are of course possible.

[0020]

According to the method for producing a resource seaweed according to the present invention, if vines are first introduced into a cultivation facility, the leaves that can be used as feed or chemicals are cut off, and then the leaves are regenerated and regenerated. Can also be collected,
It is not necessary to repeat each operation from seedling collection to main training as in the prior art, and an excellent effect that productivity is greatly improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an example of a culture facility used in the present invention.

FIG. 2 is an enlarged view showing an initial state of the culture rope shown in FIG.

FIG. 3 is an explanatory diagram in the case of picking vines from the aquaculture class shown in FIG. 1;

FIG. 4 is a schematic explanatory view showing another example of the culture facility used in the present invention.

FIG. 5 is a plan view showing an example of a carrier used for introducing a baby larva.

FIG. 6 is a schematic explanatory view of a culture facility using the carrier shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Culture facility, 2 ... Float, 3 ... Block, 4 ... Stemline, 6, 20, 36 ... Culture substrate, 9 ... Seedling thread, 11 ... Leaf-like part, 12 ... Stem-like part, 13 ... Creeping root part

Claims (5)

[Claims] 1. A leaf-shaped cuttlefish, which belongs to the family Laminariaceae, is grown on a cultured substrate of an appropriate shape and grown in the sea until it reaches a required size, and then leaves a creeping root portion for leaf regeneration. A method for producing a resource seaweed, wherein the part is a resource seaweed. 2. The method for producing a resource seaweed according to claim 1, wherein the cultured substrate is raised to the sea, the leaf is cut off, and then returned to the sea to regenerate the leaf. 3. The method according to claim 1, wherein the culture substrate is a string. 4. The method according to claim 1, wherein the culture substrate is a concrete structure installed on the sea floor. 5. The method according to claim 4, wherein an algae paint is applied to the surface of the culture substrate.