JP2001204280A - New method for culturing laver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a strongly acidic solution which has been used so as to remove marine algae (so-called miscellaneous algae) attached to the surface of leaf body of laver except laver and bacteria to cause disease damages during culture of laver. SOLUTION: One, two or the whole three of an inorganic salt such as salt, etc., an oxidizing substance such as potassium permanganate, etc., and a nutrient for laver such as amino acid, etc., are used not only in the acidic solution used for these purposes but also in a neutral and an alkali solution so that miscellaneous algae and pathogenic bacteria are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention is used for cultivation of laver, which is widely used as a coastal fishery. When seaweed is grown in the sea, other seaweeds other than seaweed (diatoms), such as diatoms and blue-green algae, attach to or infest the leaves of the seaweed and remain in the final seaweed product, resulting in product This is a factor that significantly lowers quality. In addition, during the cultivation of laver, nori is often afflicted with pathogens such as red germs and filamentous bacteria, causing catastrophic damage, but for the purpose of preventing such damage, An operation of immersing the seaweed during cultivation in an acidic solution is often performed as needed during the seaweed cultivation period. The present patent is an improvement on such a conventional technique so that not only acidic solutions but also neutral and alkaline solutions can be effectively used.

[Prior Art] At present, for the purpose of removing such algae other than laver adhering to the leaf body of laver and controlling and preventing pathogenic bacteria, pH 2.0 mainly containing organic acids is used.
Very strong acidic solutions, around or below, are used.

[Problems to be Solved by the Invention] At first, acidic solutions used for laver cultivation mainly consisted of only organic acids having a pH of about 2.0 to 2.2. As a result of continuing to use, as a result of gradually increasing the resistance to acid by the algae and pathogens attached to nori, in order to make the effect of acid effective,
The use of stronger acidic solutions has been forced every year. In addition, the use of a strong acid can reduce the time for immersion in an acidic solution, and there is also a policy of the producer to save labor.In addition, as the method of treating an acidic solution is mechanized from the conventional manual operation, a stronger acid is applied. There is a tendency to use solutions. The use of such a strong acidic solution may cause environmental pollution for seaweed farmers from the standpoint of their safety and the release of strongly acidic substances into the sea. This is never a good thing, as there is a fear of destroying it.

[Means for Solving the Problems] The present invention is intended to sufficiently reduce the acidic solution used in the current nori cultivation not only on the strongly acidic side, but also on a weakly acidic, neutral or alkaline solution. The problem is solved by adding an inorganic salt such as salt and an oxidizing substance so as to achieve the purpose.

Prior to the spread of acidic solutions for laver cultivation, there is a production process called drying, in which a laver net is lifted off the sea surface, drained and dried. At this time, as the seawater attached to the leaf of the laver is gradually dried, the salt concentration increases, so that the moisture in the cells of the laver comes out due to the osmotic action, and the laver shrinks. Other algae other than laver are in the same state, but since they are not as resistant to osmotic pressure as laver, their intracellular water is exposed to death. Bacteria, which are pathogenic bacteria, also die. There are many tidal flat fishing grounds where the tidal range is generally large in places that have long been known as laver production areas because of the fact that it is easy to use the power of nature when performing such drying work. It is because. However, in recent years, with the spread of coastal development projects,
Due to the loss of fishing grounds where fishing can be done, and the severe pollution of the sea in the tideland fishing grounds, the number of fishing grounds where such fishing can be done has become extremely small. For this reason, seaweed farms have moved offshore year by year, and a fishing method called floating aquaculture has developed. In these offshore areas, raising and lowering the laver net to dry out the laver is problematic in terms of workability.
Nori remains in the sea. Therefore, as an alternative to this drying operation, immerse seaweed in an acidic solution and use the power of acid to kill non-seaweed weeds or pathogens that are less resistant to acid than seaweed. The technology of getting lost is widespread.

The present invention increases the salt concentration by adding inorganic salts such as salt to an acidic solution used for laver cultivation, so that an osmotic effect can be exerted in the same manner as in the drying operation. It is in. Therefore, instead of relying on the acid-killing power of a strongly acidic solution as before,
Even in a relatively weak acidic solution, its purpose can be sufficiently achieved by the osmotic effect caused by the high salt concentration in which inorganic salts such as salt are added. Further, by using an oxidizing substance such as potassium permanganate together with the above, it is possible to carry out the effective and appropriate treatment over the entire acidic, neutral and alkaline regions, similarly to the conventional acidic treatment.

According to the present invention, the pH of the acidic solution is usually used in the range of 4.0 to 6.0.
H4.0 or less can be used. At this time, by using an inorganic salt such as salt in combination, the pH is further lowered and stabilized compared to a case where the inorganic salt is not used in combination. If the acid concentration is the same, the action as an acid will be stronger when the salt and the like are used together. Therefore, the amount of the stock solution (acid treatment solution generally available on the market) used to make the acidic solution has been The same effect can be expected even if it is reduced more, and the production cost can be reduced. It is desirable from the viewpoint of environmental protection to reduce the amount of the acid treatment liquid used. In addition, since such acidic treatment is performed in a tank of a certain size, until now, when seaweed is immersed in an acidic solution, seawater attached to the seaweed is brought into the tank and acidified. As a result of the dilution of the solution, p
As H rises and the effect as an acid weakens,
In order to maintain a constant pH, it was sometimes necessary to replenish the acid. However, it was also found that by using an inorganic salt in combination with an acid, the pH was kept stable by a kind of buffering action, and complicated work such as replenishment of the acid could be reduced.

In a solution with a high salt concentration to which inorganic salts or the like have been added, the seaweed has a certain dryness due to the osmotic action of the moisture inside the cells, which causes the cells to shrink. This is a kind of hunger, so if you put these seaweed back into the seawater, you will quickly take in the seawater and try to return to the normal state at once. Therefore, if the nori nutrients are placed in a solution with a high salt concentration, when the nori is returned to seawater, the nutrients attached to the leaves of the nori will be easily absorbed along with the seawater, especially the nori The addition of amino acids and the like, which are indispensable for the growth of seaweed, in a high-salt solution is an extremely effective means for cultivating good and healthy nori. In addition, amino acids have very good affinity for mannan that covers the leaf surface of laver, and immersing raw laver in a solution of amino acids results in a thin film of amino acids on the leaf surface of laver In other words, since this film protects the laver, it is possible to produce laver with a soft flavor. Hereinafter, embodiments according to the present invention will be specifically described.

Example 1 An acid solution (about 1%) of a 100-fold solution containing 3 g of a commercially available acid-treated solution stock solution (trade name: Minori Ichiban) in 300 ml of seawater.
Solution), 5 g of sodium chloride (NaCl) as an inorganic salt, 1 g
The changes in pH when 0 g, 20 g, and 30 g were added are as follows. It can be seen that the pH decreases as the amount of salt added increases.

Example 2 An acid solution (100-fold solution) obtained by adding 3 liters of a stock solution of an acid-treated solution to 300 liters of seawater, in exactly the same manner as a method of preparing an acidic solution commonly used by a laver producer. And 20 kg of salt as an inorganic salt is added thereto, and p
The change in H and the working time until the alga was removed by actually immersing the laver net in this solution were visually confirmed. pH change Salt concentration Before use Seawater After injecting acid treatment liquid After salt injection 20kg / 300l pH7.95 pH1.82 PH1.45 (water temperature) (9.7 ℃) (10.7 ℃) (10.8 ℃) ( (Specific gravity) (1.023) (1.026) (1.068) Working time (per laver net) When using only acid treatment liquid When using acid treatment liquid / salt combination First sheet 5 minutes 48 seconds First sheet 3 minutes 25 seconds 2〃5 minutes 33 seconds 2〃2 minutes 58 seconds 3〃5 minutes 29 seconds 3〃3 minutes 15 seconds 4〃6 minutes 08 seconds 4〃3 minutes 09 seconds 5〃5 minutes 50 seconds 5〃2 minutes 44 seconds average 5 minutes 45 seconds average 3 minutes 06 seconds Injection of salt lowers the pH, and the purpose can be achieved in about half the working time as compared with the conventional case of using only an acidic solution. For reference, the work time up to now is pH 2.0
In the case of the acidic solution before and after, the time is generally 5 to 10 minutes.

Example 3 To 300 l of seawater, 1 l of the undiluted solution of the acid-treated solution was added, and then 30 kg of salt was added to investigate the change in pH and the working time. pH change Salt concentration Seawater used After injecting acid treatment liquid After salt injection 30kg / 300l PH7.95 pH2.38 pH2.12 (Water temperature) (9.82 ° C) (10.3 ° C) (10.5 ° C) Working time (Per laver net) When the acid treatment liquid alone is used When the acid treatment liquid / salt is used together 1st sheet 14 minutes 32 seconds 1st sheet 6 minutes 10 seconds 2〃 14 minutes 55 seconds 2〃 6 minutes 25 seconds 3〃 15 Min 48 sec 3〃 6 min 28 sec average 15 min 15 sec average 6 min 21 sec At this time, a 300-fold solution of the undiluted acid treatment solution was used. The working time has been greatly reduced compared to that of

Example 4 In Example 3, the operation was continued without replenishing the stock solution of the acid treatment solution, and the pH of the acidic solution near the end of the operation was 2.16 (water temperature of 10.6 ° C.). PH 2.1
There was not much change from 2, and the working time at this time was found to be effective as follows.

Example 5 A test was conducted to determine whether or not algae other than laver could be removed by placing a laver net in a solution containing only 50 kg of salt without adding an undiluted acid-treated solution to 300 l of seawater. As a result, it was found that an osmotic pressure effect can be expected and practical use is possible. pH change Salt concentration Seawater used Salt water 50kg / 300l After feeding salt pH 7.94 PH 8.05 (Water temperature) (10.4 ° C) (10.8 ° C) Working time (per laver net) First 6 minutes 35 seconds 2〃 6 minutes 29 seconds 3〃 6 minutes 14 seconds 4〃 6 minutes 22 seconds 5〃 6 minutes 37 seconds Average 6 minutes 27 seconds

Example 6 When 300 g of potassium permanganate was added to the solution used in Example 5, almost the same results as in Example 2 could be obtained. This indicates that the algae can be removed by the osmotic effect of salt and the action of potassium permanganate without using an acidic solution. Change in pH Salt concentration Concentration of seawater Used salt After adding potassium permanganate 50kg / 300l pH 7.95 pH 8.00 pH 8.11 (water temperature) (9.50 ° C) (9.48 ° C) (9.85 ° C) Work Time (per nori net) 1st 3 min 50 sec 2 min 3 min 35 sec 3 min 3 min 20 sec 4 min 3 min 31 sec 5 min 3 min 42 sec Average 3 min 35 sec

Example 7 It was confirmed that when 100 g of potassium permanganate was added to the solution of Example 2, workability was remarkably improved. Since the purpose of adding an oxidizing substance to an acidic solution can be achieved in a very short time, the mechanization of the acidic solution treatment can be performed by using a normal acidic solution without using a strong acidic solution. The purpose can be achieved by measuring the quantitative adjustment of the oxidizing substance. Work time (per 1 seaweed net) 1st 1 min 55 sec 2 min 2 min 08 sec 3 min 1 min 48 sec 4 min 1 min 39 sec 5 min 1 min 46 sec Average 1 min 51 sec

Example 8 When 100 g of sodium polyphosphate was added to the solution of Example 2, no significant change was observed in pH and workability, but the laver had a vivid black color. Quality improvement was recognized. For the confirmation, 5 samples each without sodium polyphosphate addition and 5 samples each with sodium polyphosphate addition were arbitrarily extracted, and the results of investigation with a seaweed quality inspection machine SG-3 type (manufactured by Murakami Mitsui Research Laboratory) are as follows. As shown below, the color tone, blackness, and gloss were all higher for the five sheets with sodium polyphosphate added than those without sodium polyphosphate, indicating superior quality. Was.

Example 9 In the acid-treated solution used for laver cultivation, those containing both salt and amino acids, those containing only amino acids, those containing no amino acids, and those containing no amino acids were used. The street was subjected to acidic treatment under the same conditions, and then returned to the same fishing ground and observed for 10 days for the growth of laver. The one immersed in a salt and amino acid-containing solution showed the best growth even with the naked eye. It was bulky and had a sense of volume. Five leaves each having the same root were collected, shaded in the same place for 24 hours to remove water, and weighed. Salt / amino acid-containing liquid Amino acid-containing liquid Amino acid-free liquid 483 g 476 g 439 g 478 359 388 490 485 413 484 462 427 475 475 475 391 Average 482 g Average 471 g Average 412 g

Example 10 In Example 9, the product using salt / amino acid and the product using no amino acid were processed into the final product, laver, and the quality was inspected. It turns out that the product has improved. Five samples each containing no amino acid and one using salt / amino acid were arbitrarily taken out, and the color tone and luster of the laver were measured by a laver quality tester SG-3 (Model Murakami Color Research Laboratory). When the average value of the five amino acid-free sheets is indicated by an index of 100, the color tone, blackness, and gloss of the five sheets using salt / amino acid are higher than the numerical values, indicating that the product has improved. Is recognized. The aroma and flavor were determined by the odor and taste of three laver producers over the years.

Claims (4)

[Claims] 1. During the cultivation of laver, an inorganic salt such as sodium chloride is added to an acidic solution used for the purpose of removing algae adhering or parasitizing to the leaves of laver and controlling and preventing diseases. By strengthening the effect of the acidic solution,
A new method of cultivating seaweed that can stabilize pH. 2. An oxidizing substance such as potassium permanganate is added to the acidic solution together with inorganic salts.
By using one or both of the inorganic salts and the oxidizing substance, even in a solution in the entire acidic range, or in a neutral or alkaline solution, the same as the conventional acidic solution can be obtained. A method of cultivating laver that can be used to remove algae and prevent the elimination of pathogenic bacteria. 3. The use of a nori nutrient such as an amino acid together with inorganic salts in this acidic solution,
A method of cultivating nori, which makes it possible to produce healthy nori with extremely good growth and growth of nori. [4] In the above [Claim 1],
Inorganic salts such as chlorides, carbonates, bicarbonates, phosphates, polyphosphates, sulfates, nitrates, etc., including sodium chloride. For [Claim 2], oxides of alkali and alkaline earth metals and It is an oxidizing substance such as a peroxide, a permanganate, a dichromate, etc. In addition, [Claim 3] refers to a substance serving as a nutrient source of laver, such as an amino acid, a peptide, or a nitrogen-containing compound. . These three are used alone or separately in an acidic, neutral or alkaline solution for the purpose of removing algae or preventing disease control during the nori cultivation period. One of them is a new method of cultivating laver using two or in combination, or in some cases using all three.