JPH09175910A - Culture of laver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for culturing laver capable of safely, efficiently controlling and/or preventing miscellaneous algae or disease injuries in a short time and also in continuous operation without affecting the environment and human health. SOLUTION: First, a treatment liquid containing 0.1-0.2wt.% of lactic acid is adjusted to pH1.5-2.0 with a pH adjuster as a combination of at least one kind selected from monovalent and polyvalent organic carboxylic acids, inorganic acids, organophosphoric acids and amino acids, Next, laver or a culture equipment stuck therewith is immersed in the treatment liquid for 10sec or longer but <3min to carry out controlling and/or preventing miscellaneous algae and disease in juries involved in laver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seaweed aquaculture method for controlling and preventing various algae such as blue seaweed and other diseases such as red rot and white rot, which occur in the culture of seaweed.

[0002]

2. Description of the Related Art Conventionally, as an algaecide or aquaculture method in this type of seaweed culture, for example, the algaecides described in JP-B-56-12601, JP-B-60-31451 or JP-B-60-31647 are disclosed. Nori culture method described in No. The algicide disclosed in Japanese Patent Publication No. 56-12601 is a saturated aliphatic monocarboxylic acid having 1 to 4 carbon atoms and 2 carbon atoms.
To 4 of saturated or unsaturated dicarboxylic acids, glycolic acid, lactic acid, tartaric acid, malic acid, and citric acid, as an active ingredient, one or more organic carboxylic acids selected from the group consisting of these organic carboxylic acids are used. 0.03-1.0%
What is dissolved in seawater so as to have the concentration of is directly sprayed on the algae community that has been dried, or is immersed in this. In addition, the Nori cultivation method of Japanese Examined Patent Publication No. Sho 60-31451 uses the seaweed cultivation equipment with the seaweed adhered to oxalic acid, malic acid,
An organic acid selected from tartaric acid, malonic acid, and benzoic acid is dissolved in seawater in an amount of 0.3 to 5% by weight and immersed in a treatment solution adjusted to pH 1.0 to 4.0 for 5 to 60 minutes,
In addition, the seaweed cultivation method of Japanese Patent Publication No. 31647/1985 includes a culture tool to which seaweed is adhered, which contains 0.3 to 5.0% by weight of citric acid in a treatment solution having a pH of 1.0 to 6.0 for 60 minutes. It is to be immersed within.

[0003]

However, in the conventional algaecides or seaweed culture methods as described above, weeding algae such as blue seaweed and diseases such as red rot and white rot are eliminated and prevented. Processing time is 5 to 60 minutes, even a short one is 3
It takes a relatively long time of 30 minutes. Specifically, the above-mentioned treatment involves pulling the seaweed net up onto the ship and immersing it in the tank for the processing liquid, and then returning the seaweed net back into the sea. The net had to be immersed for 5 to 30 minutes or more, a waiting time was required during that time, and the work efficiency was extremely poor because of batch processing. However, the seaweed is cultivated mainly in winter, and the fishing grounds in the Kanto and Tokai regions often have rough seas during the winter, and there are limited processing times.
In addition, in the fishing grounds of the Ariake Sea, there is a large difference in the tide and the time when boats can leave is limited. Therefore, with the conventional method that takes a relatively long time as described above, the seaweed net There was a problem that the number of sheets was limited to about 50 at most, and it could not be processed very much. In addition, there are fishing grounds where a special boat called a moguri boat has been developed and used, in which a boat is dipped under the seaweed net and the treatment liquid is passed through the net under the net. In this case, the time when the seaweed net is immersed in the treatment solution is extremely short, only 10 seconds to 30 seconds, and it takes a long time of 3 to 30 minutes or 60 minutes to exterminate and prevent the above-mentioned algae and diseases. With the conventional algicides required, the desired algicidal and disease preventing effects could not be expected at all.

[0004] Therefore, the elimination of such algae and diseases,
As a method of performing prevention in a short time, Japanese Patent Application Laid-Open No. 59-1597
No. 25 proposes a method in which a hydrogen chloride agent and a malachite green preparation are used at the same time. According to this method, the above treatment can be performed in a relatively short time.
However, the hydrogen chloride used here has a high risk of handling and is highly corrosive to metals, and therefore is not suitable for practical use. Furthermore, the malachite green used at the same time is not only a food additive but is not resistant to the use of laver products that value the image of natural foods, and this malachite green is also used as a pesticide, The impact cannot be denied, and there are still problems such as environmental pollution. In addition, seaweed treated with hydrogen chloride and pesticides has hardened leaves, cracks, shrinkage, and even holes. Therefore, it is necessary to immerse the harvested seaweed in water and stir it to soften it, which not only reduces the freshness, but also causes the seaweed extract, umami, etc. to flow out into the water and become unpleasant. In addition, if the seaweed is cracked or has holes, it can only be minced and used.
However, in the past, since there was no other method that can be treated in a short time as described above, it is actually expected that such a bad effect on the human body and the environment will be expected, and further, malachite green, etc., which leads to quality deterioration, must be used unavoidably. At present, there are cases where processing is performed in a short time.

In view of the above points, the present invention is a safe, short-term, and continuous work efficiently exterminating and preventing the algae and diseases in the cultivation of seaweed without adversely affecting the human body and the environment. It is intended to provide a seaweed cultivation method that makes it possible to

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the content of lactic acid is 0.1 to 2.0% by weight and a pH adjusting agent, and the pH is 1.5 to 2.0. The above object was achieved by using an algicidal agent characterized by being adjusted. That is, the present invention uses 0.1 to 2.0% by weight of lactic acid.
The pH of the treatment liquid containing the above is adjusted to 1.5 to 2.0, and the seaweed or the aquaculture tool to which the seaweed is attached is added to the treatment liquid for 10 seconds to 3 seconds.
This is a seaweed cultivation method characterized by exterminating and preventing the algae and diseases that occur in seaweed by immersing the seaweed in the time within a minute. As the pH adjuster, one or a combination of two or more selected from monovalent or polyvalent organic carboxylic acids, inorganic acids, organic phosphoric acids, or amino acids can be used. In addition, the seaweed aquaculture method of the present invention can be performed using a mog boat.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the seaweed aquaculture method according to the present invention, if the concentration of lactic acid in the treatment liquid is less than 0.1% by weight, even if the pH of the treatment liquid is adjusted within the above range, it will take a short time. There is no immediate effect for processing, and the intended purpose cannot be achieved. Further, when the concentration of the treatment liquid is in the range of 1.5 to 2.0 with only lactic acid, the rapid action is obtained, but the concentration of lactic acid is too high and Not only etc., but also the important seaweed itself was seriously injured,
Not only does the quality of the product deteriorate, but even if the immersion time of the seaweed in the processing liquid is slightly changed, the seaweed may die or the processing may fail, resulting in poor workability and practicality. Disappear. When an acid other than lactic acid is used,
Even if the pH of the treatment liquid is adjusted within the above range, the same effect cannot be obtained. Also, PH in this case
The regulator is selected from monovalent or polyvalent organic carboxylic acids, inorganic acids, organic phosphoric acids, or amino acids.
One kind or a combination of two or more kinds can be used. In addition to the above, a fertilizer component such as ammonium chloride or ammonium sulfate can be appropriately used in combination.

(Experiment 1) Lactic acid was dissolved in seawater at a concentration shown in Table 1 below and pH was not adjusted, and 10 pieces of nori leaf infected with red rot and 10 pieces of healthy nori leaf were each added. After soaking for 2 seconds or 3 minutes, each leaf was observed under a microscope to compare the degree of necrosis of lesion cells and laver cells. Table 1 shows the results
It is shown along with

[0009]

[Table 1]

As is clear from Table 1, when the concentration of lactic acid is lower than 0.1% by weight or when the pH of the treatment liquid is 2.0 or more, the treatment time is as short as 10 seconds to 3 minutes. No effect on red rot was observed, and when the pH was 2.0 or less with lactic acid alone, the necrosis of the lesion increased with the treatment time of 10 seconds, but the necrosis of the seaweed also increased. I will end up.

(Experiment 2) A treatment solution prepared by dissolving lactic acid in seawater at a concentration shown in Table 2 below was adjusted to pH 1.8, and the treatment solution was mixed with nori leaf infected with red rot and healthy nori leaf. 1 each
After soaking for 0 seconds or 3 minutes, each leaf body was observed with a microscope to compare the degree of necrosis of lesion cells and laver cells. The results are also shown in Table 2.

[0012]

[Table 2]

As is clear from the results of Table 2, when the concentration of lactic acid is 0.05% by weight, even if the pH of the treatment liquid is adjusted to 1.8, it must be immersed for at least 3 minutes. When the pH is 1.8 and the concentration of lactic acid is 0.1% by weight or more, the lesion is necrotic after 10 seconds of immersion, and no damage to seaweed is observed.

(Experiment 3) A treatment liquid prepared by dissolving lactic acid, citric acid, malic acid, and hydrochloric acid in seawater at a concentration of 0.3% by weight was adjusted to pH 1.8, and the treatment liquid was infected with red rot. After the soaked nori leaves and healthy nori leaves were soaked for 10 seconds each, the leaves were observed with a microscope to compare the degree of necrosis of lesion cells and laver cells. The results are shown in Table 3.

[0015]

[Table 3]

As is clear from the results shown in Table 3, when an acid other than lactic acid was used, its concentration was 0.3% by weight,
Moreover, even if the pH of the treatment liquid is adjusted to 1.8, no effect on lesions is observed at a treatment time of about 10 seconds, and the effect is not as fast as when lactic acid is used.

[0017]

[Example] A treatment liquid in which lactic acid was dissolved in seawater at a concentration of 0.5% by weight was adjusted to pH 1.6, and aquaculture net with agar paste and seaweed was immersed in this treatment liquid for 30 seconds or 2 minutes. After that, each leaf was stained with an erythrosin solution, and the degree of necrosis of each was examined. Table 4 shows the results.

[0018]

[Table 4]

As is clear from the results shown in Table 4, according to the present invention, the paste is necrotic within a processing time of 30 seconds to 2 minutes, and no damage is caused to seaweed.

[0020]

Industrial Applicability As described above, according to the seaweed cultivation method of the present invention, it is possible to prevent undesired algae such as paste and red rot and white rot in a short time within 10 seconds to 3 minutes. Since it can be exterminated and prevented, it can be treated by a series of continuous operations such as pulling the seaweed net out of the sea, dipping it through the processing liquid in the processing liquid tank on the ship, and returning it back to the sea again. There is no need for waiting time in the inside, and moreover, it is possible to perform the treatment work efficiently by continuous work, which enables the work on the rough sea in winter in a short time and, as described above, the seaweed net to the treatment liquid. Since the soaking time is short, it is possible to perform processing using a mog boat, and the processing work can be greatly saved. In addition, in the present invention,
It can be safely processed without adversely affecting the human body or the environment as in the case of using hydrogen chloride or malachite green pesticides. In addition, there is no fear that the seaweed itself will be damaged and the quality will be deteriorated as in the case of using hydrogen chloride or pesticide.

Claims (3)

[Claims] 1. The pH of a treatment liquid containing 0.1 to 2.0% by weight of lactic acid is adjusted to 1.5 to 2.0, and the seaweed or aquaculture equipment to which the seaweed is adhered is added to the treatment liquid for 10 seconds to. A seaweed culture method characterized by exterminating and preventing the algae and diseases that occur in seaweed by immersing the seaweed in the time within 3 minutes. 2. A treatment liquid comprising a combination of one or more selected from a monovalent or polyvalent organic carboxylic acid, an inorganic acid, an organic phosphoric acid, or an amino acid as a pH adjusting agent. The seaweed aquaculture method according to claim 1, wherein the seaweed aquaculture is added. 3. The seaweed aquaculture method according to claim 1 or 2, wherein the treatment is carried out using a mog boat.