JP2004035488A - Algacide - Google Patents

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JP2004035488A
JP2004035488A JP2002196174A JP2002196174A JP2004035488A JP 2004035488 A JP2004035488 A JP 2004035488A JP 2002196174 A JP2002196174 A JP 2002196174A JP 2002196174 A JP2002196174 A JP 2002196174A JP 2004035488 A JP2004035488 A JP 2004035488A
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Japan
Prior art keywords
acid
treatment
aonori
minutes
laver
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JP2002196174A
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JP4409153B2 (en
Inventor
Hiroaki Takamoto
高本 裕昭
Kazuhiko Okuzono
奥薗 一彦
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Daiichi Seimo Co Ltd
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Daiichi Seimo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an algacide capable of controlling sundry algae such as green laver emerging in cultivation of laver. <P>SOLUTION: This algacide for controlling the sundry algae emerging in the cultivation of the laver contains an organic acid and phosphoric acid as essential components. The concentrations of the organic acid and the phosphoric acid are 0.5-5 W/V% and 0.5-3 W/V%, respectively, and the treatment is carried out in ≤3 min by regulating the pH at ≤1.8. Inorganic acids are used in combination therewith at the treatment. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、海苔養殖中に発生する、アオノリ等の雑藻類を駆除する殺藻剤に関する。
【0002】
【従来の技術】
海苔養殖中に、アオノリ等の雑藻が海苔葉体又は海苔網に大量に付着すると海苔の生育を阻害し、ひいては海苔が枯死する場合もある。雑藻類の付着が少ない場合も、その海苔原藻を製品にすると緑色の斑点が見え、外観を損ねる為、商品価値が著しく低下する。
現在では、クエン酸、リンゴ酸等を主成分とする製品を用いてアオノリなどの雑藻の駆除を行っているが、充分な効果が得られず、短時間で効果が高い駆除方法が求められている。
【0003】
今までに、下記に示すような海苔養殖用の処理剤が開示されている。
特開昭50−121425号公報には「炭素数1ないし4の飽和脂肪族モノカルボン酸、炭素数2ないし4の飽和または不飽和ジカルボン酸、グリコール酸、乳酸、酒石酸、リンゴ酸、クエン酸から成る群から選ばれた有機カルボン酸の一種又は二種以上を有効成分として含有する殺藻剤」とある。この公報には有機酸を用いて雑藻を駆除することが記載してあるが、30分の処理時間では雑藻の駆除効果が不十分であり、3分以下という短時間処理を示唆する記載はない。また、pHに関する記載もない。
【0004】
特開昭55−21743号公報には「養殖過程における適時にクエン酸0.3〜5.0重量%を含み、pHが1.0〜6.0の処理液に浸漬させて雑藻、病害の駆除、予防を行うようにしたことを特徴とする海苔養殖法。」とある。この公報にはクエン酸を用いて雑藻を駆除することが記載してあるが、実施例にはpH1.9以下の記載はなくpH1.8以下という低いpHで、3分以下という短時間処理を示唆する記載はない。
【0005】
特開昭55−88636号公報には「養殖過程における適時に有機酸(但しクエン酸を除く)0.3〜15重量%を含みかつpH1.0〜4.0に調整された処理液に浸漬させた後、海水中で引き続き養殖を行うことにより雑藻、病害の駆除、予防を行うにしたことを特徴とする海苔養殖法。」とある。この公報には酒石酸を用いて雑藻を駆除することが記載してあるが、10分以下の処理の実施例はなく、3分以下という短時間処理を示唆する記載はない。
【0006】
特開昭59−82027号公報には「養殖過程における適時に無機酸を添加してpH1.0〜4.0とした処理液に5〜60分浸漬させた後、海水中に戻して引続き養殖させ雑藻、病害の駆除、予防を行うにしたことを特徴とする海苔養殖法。」とある。この公報にはリン酸を用いて雑藻を駆除することが記載してあるが、駆除効果が認められる最も短い処理時間でも15分を要し、3分以下という短時間処理を示唆する記載はない。
【0007】
特開平9−201180号には「海水に、無機塩類と酸とを加えて比重を1.001〜1.060に調整し、且つpHを0.5〜3.0に調整した海苔用処理液に、海苔または海苔が付着した養殖具を浸漬することを特徴とする海苔の処理方法。」とある。この公報には有機酸と塩類を併用使用してケイソウ、赤腐れ菌、壺状菌を駆除する実施例が記載してあるが、3分以下という短時間でのアオノリの駆除を示唆する記載はない。
【0008】
最近の海苔養殖では、海苔生産者一軒当たりの養殖網の枚数が増加したために、養殖網1枚当たりの処理に要する時間を短くせざるを得なくなり、より短時間で効果のある安全な雑藻の駆除方法が求められている。
【0009】
【本発明が解決しようとする課題】
本発明は、海苔自体に害を与えることなく、アオノリ等の雑藻類を短時間に駆除する薬剤を提供することを目的とする。
【0010】
【課題を解決するための手段】
本発明者は、鋭意検討を重ねた結果、有機酸とリン酸を併用することによってアオノリ等の雑藻類を短時間に駆除できることを見い出し、本発明を完成させるに至った。
即ち、本発明は次の通りである。
(1)有機酸とリン酸を主成分とし、有機酸の濃度が0.5〜5W/V%、リン酸の濃度が0.5〜3W/V%、処理時間が3分以下であることを特徴とする海苔養殖用の殺藻剤。
(2)有機酸がクエン酸、リンゴ酸、グルコン酸、ケトグルタル酸、酒石酸、フィチン酸の1種以上であることを特徴とする(1)記載の海苔養殖用の殺藻剤。(3)処理時のpHが1.8以下であることを特徴とする(1)、(2)記載の海苔養殖用の殺藻剤。
(4)処理時に無機塩類を1〜25%添加することを特徴とする(1)〜(3)記載の海苔養殖用の殺藻剤。
【0011】
【発明の実施の形態】
以下、本発明の実施の形態を詳しく説明する。
本発明の殺藻剤は、殺藻の処理時に海水又は水に希釈、添加、或いはそのまま使用され、海苔養殖時に発生する雑藻の駆除を行うものであり、有機酸とリン酸を主成分とする。
【0012】
本発明の殺藻剤は、殺藻の処理時或いは使用時に海水又は水などで希釈して使用される。その希釈倍率は、好ましくは5〜300倍であるが、これに限るものではなく、その製剤としての使用態様に応じて倍率を決めることができる。また、本発明の殺藻剤は、殺藻の処理時に添加して使用される。殺藻剤を成分ごとに小分け包装した製剤等として提供されるときなどを一例として挙げることができ、船等の処理槽等に殺藻剤の成分を直接添加する場合等である。更に、施設が整っていれば、殺藻剤の貯留タンクから船等の処理槽等にそのまま供給して使用しても良い。
【0013】
浸漬処理法と呼ばれる海苔網を養殖支柱から取り外して行う処理法では通常5〜10分程度の処理が行われており、3分以内の短時間でアオノリなどの雑藻の駆除効果が求められている。また、海苔網を固定したまま、潜り船を潜らせる処理法では通常60秒程度の処理が行われている。更に、養殖規模の拡大により、箱船中の処理液を潜らせる素通し処理法と呼ばれる10〜20秒程度の処理も行われている。この為潜り船や箱船を潜らせる処理法では20〜60秒程度の短時間でアオノリなどの雑藻を駆除する効果が望まれている。そのため、クエン酸、リンゴ酸等を主成分とする製品を10〜20倍液にて使用するようになってきている。しかし、雑藻の駆除効果は不十分である。
【0014】
実際に、後述する実施例より、酸単独では効果は高くならないが、酸とリン酸を併用することによって短時間で雑藻を駆除できることが分かった。
【0015】
本発明に用いる有機酸の内容は、クエン酸、リンゴ酸、グルコン酸、ケトグルタル酸、酒石酸、フィチン酸を挙げることができる。
本発明の有機酸はこれらの酸の少なくとも1種類以上から成り立つ。
【0016】
本発明の殺藻剤は、その殺藻処理時における有機酸濃度が0.5〜5W/V%の範囲であることが好ましい。酸濃度が0.5W/V%を下回ると効果が出にくく、その濃度が5W/V%を上回ると処理中に健全な海苔も傷む場合がある。また、リン酸濃度が0.5〜3W/V%の範囲であることが好ましい。その濃度が0.5W/V%を下回ると効果が出にくく、逆に濃度が3W/V%を上回ると処理中に健全な海苔も傷む場合がある。
【0017】
本発明の殺藻剤は、その殺藻処理時におけるpHを1.8以下に調整することが望ましい。pHの調整には塩酸、硫酸等の無機酸を用いても良い。
【0018】
また、本発明の殺藻剤を用いて殺藻処理する場合は、塩化ナトリウム、塩化カリウム、塩化マグネシウムなどの無機塩類を添加することが望ましい。これらの塩類を添加するとアオノリなどを殺藻する効果が高くなる。添加量としては処理液に対して1〜25%となるように添加するのが望ましい。添加量が1%以下では殺藻効果が向上せず、逆に25%以上では健全なノリまで傷む場合がある。
【0019】
本発明の殺藻剤には、必要により肥料成分として、アミノ酸、塩安、硝酸ソーダ、硝安、硝酸カリウム、リン酸ソーダ、燐安、リン酸カリウム、硫安、糖類等を添加することもできる。
【0020】
本発明を実施するときは、有機酸とリン酸の混合物を海水又は水で希釈しても良く、海水又は水に直接又はそれぞれを添加して使用しても良い。
【0021】
【実施例】
次に、本発明を実施例及び比較例により更に詳述する。
(実施例1〜6及び比較例1〜13)
表1に示した有機酸をそれぞれ海水に溶かし0.5W/V%に調整した。アオノリと海苔をこの調整液で処理した後、滅菌海水にて洗浄した。
2日後にアオノリの駆除効果と海苔の傷害を顕微鏡にて調査した。結果を表1に示す。
【0022】
【表1】

Figure 2004035488
【0023】
比較例1、3及び4に示したようにマレイン酸、アジピン酸、コハク酸とリン酸を併用してアオノリの駆除を行うとアオノリの駆除と同時に海苔が傷み始め、処理できない。
また、比較例2、5〜10に示したようにフマル酸、イタコン酸、酪酸、プロピオン酸、酢酸、乳酸、ぎ酸とリン酸を併用してアオノリの駆除を行うとアオノリを駆除して10秒後にノリが傷み始め、処理できない。
しかし、実施例1〜6に示したようにクエン酸、リンゴ酸、グルコン酸、ケトグルタル酸、酒石酸、フィチン酸とリン酸を併用してアオノリの駆除を行うと、3分以下の短時間でアオノリが駆除されて、ノリが傷み始めるまで時間がある為、処理できる。漁場での実際の処理では駆除時間の3倍以上の時間、いわゆる安全幅が必要である。
また、比較例11、12に示したようにクエン酸又はリンゴ酸単独処理では、アオノリの駆除に20分又は17分かかり、3分以下の短時間処理ができない。比較例13にリン酸単独処理について示したが、この処理方法ではアオノリの駆除に6分かかり、3分以下の短時間処理ができない。
【0024】
(実施例7〜11及び比較例14〜20)
クエン酸とリン酸を表2に示した濃度になるように海水に溶かして調整した。アオノリと海苔をこの調整液で処理した後、滅菌海水にて洗浄した。
2日後にアオノリの駆除効果を顕微鏡にて調査した。結果を表2に示す。
【0025】
【表2】
Figure 2004035488
【0026】
比較例14〜16に示したようにクエン酸単独ではアオノリを3分以内に駆除することはできなかった。また、比較例17に示したようにリン酸を単独で0.5W/V%使用するとアオノリを3分以内に駆除することはできなかった。比較例18に示したようにリン酸を単独で3.0W/V%使用するとアオノリを60秒で駆除できたが、90秒で海苔が傷み使用幅が狭く漁場での実際の処理は困難である。
比較例19に示したようにリン酸濃度が4W/V%では使用幅が狭く、処理できない。同様に比較例20に示したようにクエン酸が6W/V%では使用幅が狭く、処理できない。
しかし、実施例7〜11に示したようにクエン酸を0.5〜5W/V%、リン酸を0.5〜3W/V%で併用して処理すると3分以下の短時間でアオノリを駆除でき、海苔が傷むまで時間があり、漁場で実際に処理できる。
【0027】
(実施例12〜16及び比較例21〜25)
リンゴ酸とリン酸を表3に示した濃度になるように海水に溶かして調整した。アオノリをこの調整液で処理した後、滅菌海水にて洗浄した。
2日後にアオノリの駆除効果を顕微鏡にて調査した。結果を表3に示す。
【0028】
【表3】
Figure 2004035488
【0029】
比較例21〜23に示したようにリンゴ酸単独ではアオノリを3分以内に駆除することはできなかった。比較例24に示したようにリン酸濃度が4W/V%では使用幅が狭く、処理できない。同様に比較例25に示したようにリンゴ酸が6W/V%では使用幅が狭く、処理できない。しかし、実施例12〜16に示したようにリンゴ酸を0.5〜5W/V%、リン酸を0.5〜3W/V%で併用して処理すると3分以下の短時間でアオノリを駆除でき、海苔が傷むまで時間があり、漁場で実際に処理できる。
【0030】
(実施例17〜19及び比較例26)
クエン酸とリン酸を表4に示した濃度になるように海水に溶かして調整した。アオノリと海苔をこの調整液で処理した後、滅菌海水にて洗浄した。
2日後にアオノリの駆除効果を顕微鏡にて調査した。結果を表4に示す。
【0031】
【表4】
Figure 2004035488
【0032】
実施例17〜19に示したようにクエン酸とリン酸を併用使用すると、pHが1.78、1.46、1.00でアオノリを3分以下の短時間で駆除できた。しかし、比較例26に示したようにpHが2.00では3分以下の短時間ではアオノリを駆除できなかった。
【0033】
(実施例20〜23及び比較例27〜30)
クエン酸、リン酸および塩化ナトリウムを表5に示した濃度になるように海水に溶かして調整した。アオノリと海苔をこの調整液で処理した後、滅菌海水にて洗浄した。
2日後にアオノリの駆除効果を顕微鏡にて調査した。結果を表5に示す。
【0034】
【表5】
Figure 2004035488
【0035】
比較例27〜29に示したように塩化ナトリウム単独ではアオノリを駆除できなかった。実施例21〜23に示したようにクエン酸、リン酸および塩化ナトリウムを併用するとアオノリの駆除時間が短くなった。しかし、塩化ナトリウムを27W/V%使用するとアオノリを5秒で駆除できたが、10秒で海苔が傷み使用幅が狭く漁場での実際の処理は困難である。
【0036】
【発明の効果】
本発明は、海苔養殖時に発生する雑藻の駆除を行う殺藻剤であって、有機酸とリン酸を主成分とし、有機酸の濃度が0.5〜5W/V%でリン酸の濃度が0.5〜3W/V%の殺藻剤でpHを1.8以下に調整して処理すると、3分以下で雑藻を駆除することができる。また、処理時に無機塩類を1〜25W/V%添加するとアオノリの駆除効果が高くなる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an algicidal agent for controlling miscellaneous algae such as aonori that are generated during laver culture.
[0002]
[Prior art]
During the laver cultivation, if a large amount of miscellaneous algae such as aonori adheres to the laver leaf or laver net, the growth of the laver may be inhibited, and the laver may eventually die. Even if there is little adherence of miscellaneous algae, if the nori seaweed is used as a product, green spots will be seen and the appearance will be impaired, so the commercial value will be significantly reduced.
Currently, we are controlling miscellaneous algae such as Aonori using products mainly composed of citric acid, malic acid, etc., but sufficient effects cannot be obtained, and there is a need for a method with high effectiveness in a short time. ing.
[0003]
Until now, the treatment agent for nori culture as shown below has been disclosed.
Japanese Patent Application Laid-Open No. 50-121425 “from saturated aliphatic monocarboxylic acid having 1 to 4 carbon atoms, saturated or unsaturated dicarboxylic acid having 2 to 4 carbon atoms, glycolic acid, lactic acid, tartaric acid, malic acid, and citric acid. An algicidal agent containing one or more organic carboxylic acids selected from the group consisting of as active ingredients. This publication describes that weeds are eliminated using organic acids, but the effect of eliminating weeds is insufficient with a treatment time of 30 minutes, suggesting a short treatment of 3 minutes or less. There is no. Moreover, there is no description regarding pH.
[0004]
Japanese Patent Application Laid-Open No. 55-21743 discloses that “weighing time in the aquaculture process includes 0.3 to 5.0% by weight of citric acid, soaked in a treatment solution having a pH of 1.0 to 6.0, and mixed with algae and diseases. Nori culture, which is characterized by the removal and prevention of the seaweed. " In this publication, cigaric acid is used to control miscellaneous algae. However, in the examples, there is no description of pH 1.9 or less, and a short treatment time of 3 minutes or less at a low pH of 1.8 or less. There is no description that suggests.
[0005]
Japanese Patent Application Laid-Open No. 55-88636 states that “it is immersed in a treatment solution containing 0.3 to 15% by weight of an organic acid (excluding citric acid) and adjusted to pH 1.0 to 4.0 at an appropriate time during the cultivation process. After that, the seaweed culture method is characterized in that the algae and diseases are controlled and prevented by continuing aquaculture in seawater. " This gazette describes the removal of miscellaneous algae using tartaric acid, but there is no example of treatment for 10 minutes or less, and there is no description suggesting short-time treatment of 3 minutes or less.
[0006]
Japanese Patent Application Laid-Open No. 59-82027 discloses that after adding an inorganic acid at a suitable time in the cultivation process to immerse it in a treatment solution adjusted to pH 1.0 to 4.0 for 5 to 60 minutes, it is returned to seawater and subsequently cultured. Nori culture, which is characterized by the elimination and prevention of miscellaneous algae and diseases. " Although this publication describes that weeds are removed using phosphoric acid, the shortest processing time in which the controlling effect is recognized requires 15 minutes, and the description suggesting a short-time treatment of 3 minutes or less Absent.
[0007]
Japanese Patent Application Laid-Open No. 9-201280 describes “a seaweed treatment solution in which inorganic salts and acids are added to adjust the specific gravity to 1.001 to 1.060 and the pH to 0.5 to 3.0. In addition, a method for treating seaweed characterized by immersing a seaweed or a culture tool to which the seaweed is attached. " This publication describes an example of controlling diatoms, red rot fungi, and rod-shaped fungi using a combination of organic acid and salt, but a description suggesting extermination of aonori in a short time of 3 minutes or less Absent.
[0008]
In recent laver culture, the number of aquaculture nets per nori producer has increased, so the time required for processing per aquaculture net has to be shortened, and it is safer and more effective in a shorter time. There is a need for an algae control method.
[0009]
[Problems to be solved by the present invention]
An object of this invention is to provide the chemical | medical agent which removes miscellaneous algae, such as aonori, in a short time, without harming nori itself.
[0010]
[Means for Solving the Problems]
As a result of intensive studies, the present inventors have found that miscellaneous algae such as aonori can be controlled in a short time by using an organic acid and phosphoric acid in combination, and have completed the present invention.
That is, the present invention is as follows.
(1) The organic acid and phosphoric acid are the main components, the concentration of organic acid is 0.5 to 5 W / V%, the concentration of phosphoric acid is 0.5 to 3 W / V%, and the treatment time is 3 minutes or less. An algicide for seaweed culture characterized by
(2) The algicidal agent for laver cultivation according to (1), wherein the organic acid is at least one of citric acid, malic acid, gluconic acid, ketoglutaric acid, tartaric acid, and phytic acid. (3) The algicidal agent for seaweed culture according to (1) or (2), wherein the pH during the treatment is 1.8 or less.
(4) The algicidal agent for laver cultivation according to (1) to (3), wherein 1 to 25% of inorganic salts are added during the treatment.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
The algicidal agent of the present invention is diluted, added to seawater or water at the time of algal killing treatment, or used as it is to control miscellaneous algae generated during laver culture, and contains organic acid and phosphoric acid as main components. To do.
[0012]
The algicidal agent of the present invention is used after being diluted with seawater or water at the time of treatment or use of the algaecide. The dilution factor is preferably 5 to 300 times, but is not limited to this, and can be determined according to the mode of use as the preparation. In addition, the algicidal agent of the present invention is used by adding at the time of algal killing treatment. An example is when the algicide is provided as a preparation in which the components are packaged into components, such as when the components of the algicide are directly added to a processing tank such as a ship. Furthermore, as long as the facilities are in place, they may be supplied as they are from a storage tank for algicidal agents to a processing tank such as a ship.
[0013]
In the treatment method that removes the seaweed net from the culture props called the soaking treatment method, the treatment is usually performed for about 5 to 10 minutes, and the effect of eliminating miscellaneous algae such as aonori is required in a short time within 3 minutes. Yes. Further, in the processing method in which the submerged ship is submerged while the laver net is fixed, the processing is usually performed for about 60 seconds. Furthermore, due to the expansion of the aquaculture scale, processing for about 10 to 20 seconds, called a through-through method in which the processing liquid in the ark is submerged, is also performed. For this reason, the treatment method for diving a submerged ship or an ark ship is desired to have an effect of eliminating miscellaneous algae such as aonori in a short time of about 20 to 60 seconds. For this reason, products containing citric acid, malic acid and the like as main components have been used in a 10 to 20-fold solution. However, the effect of eliminating miscellaneous algae is insufficient.
[0014]
Actually, from the examples described later, it was found that the effect of the acid alone is not enhanced, but the algae can be controlled in a short time by using the acid and phosphoric acid together.
[0015]
Examples of the contents of the organic acid used in the present invention include citric acid, malic acid, gluconic acid, ketoglutaric acid, tartaric acid, and phytic acid.
The organic acid of the present invention comprises at least one of these acids.
[0016]
The algicidal agent of the present invention preferably has an organic acid concentration in the range of 0.5 to 5 W / V% during the algicidal treatment. When the acid concentration is less than 0.5 W / V%, the effect is difficult to be obtained, and when the acid concentration is more than 5 W / V%, a healthy laver may be damaged during the treatment. The phosphoric acid concentration is preferably in the range of 0.5 to 3 W / V%. If the concentration is less than 0.5 W / V%, the effect is difficult to be obtained. Conversely, if the concentration exceeds 3 W / V%, healthy laver may be damaged during the treatment.
[0017]
As for the algicidal agent of this invention, it is desirable to adjust pH at the time of the algicidal treatment to 1.8 or less. For adjusting the pH, an inorganic acid such as hydrochloric acid or sulfuric acid may be used.
[0018]
Moreover, when performing the algicidal treatment using the algicidal agent of the present invention, it is desirable to add inorganic salts such as sodium chloride, potassium chloride, magnesium chloride. Addition of these salts enhances the effect of killing aonori. The addition amount is desirably 1 to 25% with respect to the treatment liquid. If the addition amount is 1% or less, the algaecidal effect is not improved. Conversely, if the addition amount is 25% or more, a healthy paste may be damaged.
[0019]
If necessary, amino acid, ammonium sulfate, sodium nitrate, ammonium nitrate, potassium nitrate, sodium phosphate, phosphate, potassium phosphate, ammonium sulfate, saccharides, etc. can be added to the algicidal agent of the present invention.
[0020]
When practicing the present invention, a mixture of an organic acid and phosphoric acid may be diluted with seawater or water, or may be used directly or added to seawater or water.
[0021]
【Example】
Next, the present invention will be described in more detail with reference to examples and comparative examples.
(Examples 1-6 and Comparative Examples 1-13)
The organic acids shown in Table 1 were each dissolved in seawater and adjusted to 0.5 W / V%. Aonori and laver were treated with this adjustment solution and then washed with sterilized seawater.
Two days later, the effect of extermination of Aonori and the damage of laver were examined with a microscope. The results are shown in Table 1.
[0022]
[Table 1]
Figure 2004035488
[0023]
As shown in Comparative Examples 1, 3 and 4, when aonori is exterminated by using maleic acid, adipic acid, succinic acid and phosphoric acid together, the laver begins to be damaged at the same time as the aonori is exterminated and cannot be treated.
Further, as shown in Comparative Examples 2 and 5 to 10, when the aonori is controlled by using fumaric acid, itaconic acid, butyric acid, propionic acid, acetic acid, lactic acid, formic acid and phosphoric acid in combination, the aonori is controlled and 10 After two seconds, the glue starts to get damaged and cannot be processed.
However, as shown in Examples 1 to 6, when aorori is controlled using citric acid, malic acid, gluconic acid, ketoglutaric acid, tartaric acid, phytic acid and phosphoric acid in combination, aonori can be obtained in a short time of 3 minutes or less. It can be processed because there is time until the worms are removed and the glue starts to get damaged. In the actual treatment at the fishing ground, a so-called safety width is required that is at least three times the removal time.
In addition, as shown in Comparative Examples 11 and 12, with citric acid or malic acid alone treatment, it takes 20 minutes or 17 minutes to control aonori, and a short time treatment of 3 minutes or less is not possible. Although the phosphoric acid single processing was shown in the comparative example 13, this processing method requires 6 minutes for extermination of aonori, and a short time processing of 3 minutes or less cannot be performed.
[0024]
(Examples 7 to 11 and Comparative Examples 14 to 20)
Citric acid and phosphoric acid were dissolved in seawater and adjusted to the concentrations shown in Table 2. Aonori and laver were treated with this adjustment solution and then washed with sterilized seawater.
Two days later, the extermination effect of Aonori was examined with a microscope. The results are shown in Table 2.
[0025]
[Table 2]
Figure 2004035488
[0026]
As shown in Comparative Examples 14 to 16, citric acid alone could not control Aonori within 3 minutes. Moreover, as shown in Comparative Example 17, when 0.5 W / V% phosphoric acid was used alone, Aonori could not be controlled within 3 minutes. As shown in Comparative Example 18, when 3.0 W / V% phosphoric acid was used alone, Aonori could be exterminated in 60 seconds, but the seaweed was damaged in 90 seconds, and the use width was narrow and actual treatment at the fishing ground was difficult. is there.
As shown in Comparative Example 19, when the phosphoric acid concentration is 4 W / V%, the range of use is narrow and treatment is impossible. Similarly, as shown in Comparative Example 20, when citric acid is 6 W / V%, the range of use is narrow and treatment is impossible.
However, as shown in Examples 7 to 11, when a combination of citric acid at 0.5 to 5 W / V% and phosphoric acid at 0.5 to 3 W / V% is used in combination, aonori can be obtained in a short time of 3 minutes or less. It can be exterminated, there is time until the seaweed is damaged, and it can actually be processed at the fishing ground.
[0027]
(Examples 12 to 16 and Comparative Examples 21 to 25)
Malic acid and phosphoric acid were dissolved in seawater and adjusted to the concentrations shown in Table 3. Aonori was treated with this adjustment solution and then washed with sterilized seawater.
Two days later, the extermination effect of Aonori was examined with a microscope. The results are shown in Table 3.
[0028]
[Table 3]
Figure 2004035488
[0029]
As shown in Comparative Examples 21 to 23, malic acid alone could not remove Aonori within 3 minutes. As shown in Comparative Example 24, when the phosphoric acid concentration is 4 W / V%, the use width is narrow and the treatment cannot be performed. Similarly, as shown in Comparative Example 25, when the malic acid is 6 W / V%, the use width is narrow and treatment is impossible. However, as shown in Examples 12 to 16, when the malic acid is used in combination at 0.5 to 5 W / V% and phosphoric acid is used at 0.5 to 3 W / V%, the aonori can be obtained in a short time of 3 minutes or less. It can be exterminated, there is time until the seaweed is damaged, and it can actually be processed at the fishing ground.
[0030]
(Examples 17 to 19 and Comparative Example 26)
Citric acid and phosphoric acid were dissolved in seawater and adjusted to the concentrations shown in Table 4. Aonori and laver were treated with this adjustment solution and then washed with sterilized seawater.
Two days later, the extermination effect of Aonori was examined with a microscope. The results are shown in Table 4.
[0031]
[Table 4]
Figure 2004035488
[0032]
As shown in Examples 17 to 19, when citric acid and phosphoric acid were used in combination, aonori could be removed in a short time of 3 minutes or less at pH 1.78, 1.46 and 1.00. However, as shown in Comparative Example 26, Aonori could not be removed in a short time of 3 minutes or less at a pH of 2.00.
[0033]
(Examples 20 to 23 and Comparative Examples 27 to 30)
Citric acid, phosphoric acid, and sodium chloride were dissolved in seawater and adjusted to the concentrations shown in Table 5. Aonori and laver were treated with this adjustment solution and then washed with sterilized seawater.
Two days later, the extermination effect of Aonori was examined with a microscope. The results are shown in Table 5.
[0034]
[Table 5]
Figure 2004035488
[0035]
As shown in Comparative Examples 27 to 29, Aonori could not be controlled with sodium chloride alone. As shown in Examples 21 to 23, when citric acid, phosphoric acid and sodium chloride were used in combination, the removal time for Aonori was shortened. However, when 27 W / V% sodium chloride was used, the blueberry could be exterminated in 5 seconds.
[0036]
【The invention's effect】
The present invention is an algicidal agent for controlling miscellaneous algae generated during seaweed culture, mainly composed of organic acid and phosphoric acid, and the concentration of organic acid is 0.5 to 5 W / V%. If the pH is adjusted to 1.8 or less with 0.5 to 3 W / V% algicide, it is possible to control miscellaneous algae in 3 minutes or less. Moreover, when 1-25 W / V% of inorganic salts are added at the time of a process, the extermination effect of aonori will become high.

Claims (4)

有機酸とリン酸を主成分とし、有機酸の濃度が0.5〜5W/V%、リン酸の濃度が0.5〜3W/V%、処理時間が3分以下であることを特徴とする海苔養殖用の殺藻剤。The organic acid and phosphoric acid are the main components, the concentration of the organic acid is 0.5 to 5 W / V%, the concentration of phosphoric acid is 0.5 to 3 W / V%, and the treatment time is 3 minutes or less. Algae for seaweed culture. 有機酸がクエン酸、リンゴ酸、グルコン酸、ケトグルタル酸、酒石酸、フィチン酸の1種以上であることを特徴とする請求項1に記載の海苔養殖用の殺藻剤。2. The algicidal agent for nori cultivation according to claim 1, wherein the organic acid is at least one of citric acid, malic acid, gluconic acid, ketoglutaric acid, tartaric acid, and phytic acid. 処理時のpHが1.8以下であることを特徴とする請求項1、2に記載の海苔養殖用の殺藻剤。The algicidal agent for seaweed cultivation according to claim 1 or 2, wherein the pH during the treatment is 1.8 or less. 処理時に無機塩類を1〜25%添加することを特徴とする請求項1〜3に記載の海苔養殖用の殺藻剤。The algicidal agent for nori cultivation according to claim 1, wherein 1 to 25% of inorganic salts are added during the treatment.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006111562A (en) * 2004-10-14 2006-04-27 Daiichi Seimou Co Ltd Algicide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006111562A (en) * 2004-10-14 2006-04-27 Daiichi Seimou Co Ltd Algicide
JP4695377B2 (en) * 2004-10-14 2011-06-08 第一製網株式会社 Algicide

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