JP2015107061A - 海藻の育成方法 - Google Patents
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Abstract
Description
1)実海域では、ノリやコンブなどの目的の海藻に対して施肥材中の栄養成分を十分に供給できないことが多かった。
また、混入した懸濁物質を取り除くためには、何度も藻体を海水で洗浄しなくてはならないことも判明した。そのため、海藻を回収した後の作業が非常に煩雑になり、さらに、回収した藻体がちぎれるなどのダメージを受けることもあり、収率が低下する恐れもあることが判った。
房状の形態で生長するスジアオノリの生育に適した施肥材の施用方法を検討した。本発明例として、100L水槽(培養槽1)にスジアオノリ藻体のみを50g(湿重量(湿質量))入れ、海水の供給口側に20kgの施肥材と60Lの海水を入れた100L液肥タンクを設置し、ポンプを介して海水と一緒に液肥を供給できるようにした(本発明例1、図1、以下液肥供給)。
実施例1の実験区と同様の装置および施肥材を用いて、複雑な構造を有するジョロモクの生長に対する施肥の効果を検証した。起毛加工を施したプラスチック製板に受精卵を着生させ、約1ヵ月間順致培養したジョロモク藻体(総湿重量(総湿質量)50g)を用い、着生板を培養槽の底に固定して生育させた。実験期間中の実験区(施肥区)の水質は、窒素に関しては、溶出液中の濃度および培養槽に供給する海水中の濃度から算出した濃度(添加濃度)が、2mg/L以上であったのに対し、排水中の濃度は、0.1mg/L以上で推移した。リンについては、溶出液中の濃度および培養槽に供給する海水中の濃度から算出した濃度(添加濃度)が、0.1〜0.3mg/Lであったのに対して、排水中の濃度は0.03〜0.13mg/L(測定値の算術平均値は定量下限値以上となった)で推移した。鉄に関しては、溶出液中の濃度および培養槽に供給する海水中の濃度から算出した濃度(添加濃度)が、6〜14μg/Lであったのに対して、排水中の濃度は5μg/L未満(測定値の算術平均値は定量下限値以上となった)で推移した(図11)。実験期間中の培養槽内の珪藻を含めた植物プランクトンの量に関しては、海水中のクロロフィル量が、実験区、対照区共に約3μg/Lで推移し、施肥による増殖は認められなかった。このことからも、添加した液肥中の栄養塩類のほとんどがジョロモクに摂取されたことは明らかだった。
コンブ藻体(胞子体)の生長に効果を及ぼす鉄の形態を比較するために、以下の培養実験を行った。ろ過滅菌海水に市販されている液肥(以下、市販液肥)、炭酸化製鋼スラグと広葉樹の剪定材由来の腐植物質を1:2で混合した施肥材からの溶出液(以下、溶出液)をそれぞれ鉄の添加濃度が0、5、10、100μg/Lとなるように調整し、培地を作製した。鉄以外には、窒素1.0mg/L、リン0.1mg/Lとなるように、市販液肥、溶出液共に濃度を合わせた。各培地200mlを入れた300mlガラス製三角フラスコに葉長約10mmのコンブ藻体を5個体ずつ加え、15℃、長日条件(明期14時間、暗期10時間)に設定した培養庫において静置条件で10日間の培養実験を行った。コンブ藻体の生長に及ぼす効果は、培養実験前後の葉長(胞子体の付着器から先端部を測定)を比較することによって評価した。
2 排水ライン
3 溶出水供給口
4 施肥材
5 液肥タンク
6 ポンプ
7 フィルター
8 溶出水供給ライン
Claims (9)
- 腐植物質及び魚かすのうち少なくとも一方と、鉄鋼スラグとを水に浸漬し、当該水中に窒素成分、リン成分、及び鉄成分を溶出させ、ついで、当該溶出水中に含まれる懸濁物質を沈降又はろ過することで除去し、懸濁物質除去後の溶出水を、海水を有する培養槽に供給し、当該培養槽中で、房状または粘着性を有する海藻を育成させることを特徴とする海藻の育成方法。
- 前記鉄鋼スラグが、炭酸化製鋼スラグであることを特徴とする請求項1に記載の海藻の育成方法。
- 前記房状または粘着性を有する海藻が、スジアオノリ又はホンダワラ類であることを特徴とする請求項1または2に記載の海藻の育成方法。
- 前記腐植物質及び魚かすのうち少なくとも一方と、鉄鋼スラグとを浸漬する水が、海水であることを特徴とする請求項1〜3のいずれか1項に記載の海藻の育成方法。
- 前記懸濁物質を除去した溶出水を、海水と共に、前記培養槽に供給することを特徴とする請求項1〜4のいずれか1項に記載の海藻の育成方法。
- 前記腐植物質及び魚かすのうち少なくとも一方と鉄鋼スラグとを浸漬する水が、海水であることを特徴とする請求項1〜5のいずれか1項に記載の海藻の育成方法。
- 液肥供給タンク内で、前記腐植物質及び魚かすのうち少なくとも一方と鉄鋼スラグとを水に浸漬して、前記懸濁物質の沈降を行い、上澄みとなる溶出水を、海水と共に前記培養槽に供給することを特徴とする請求項1〜6のいずれか1項に記載の海藻の育成方法。
- 前記培養槽へ、前記溶出水を連続的又は断続的に供給することを特徴とする請求項1〜7のいずれか1項に記載の海藻の育成方法。
- 前記培養槽内の海水中の、窒素濃度、リン濃度、及び鉄濃度を管理し、それぞれの濃度が所定の濃度範囲になるように、前記溶出水の供給量を調整することを特徴とする請求項1〜8のいずれか1項に記載の海藻の育成方法。
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Cited By (6)
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---|---|---|---|---|
CN105660357A (zh) * | 2016-01-27 | 2016-06-15 | 叶伟武 | 一种浒苔人工半咸水生态育苗法 |
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CN113615566A (zh) * | 2021-09-10 | 2021-11-09 | 中国海洋大学 | 浒苔多世代连续培养装置及其培养方法 |
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JP2017042088A (ja) * | 2015-08-26 | 2017-03-02 | 新日鐵住金株式会社 | 褐藻類の生育方法、及び褐藻類付きの水和固化体の製造方法 |
CN105660357A (zh) * | 2016-01-27 | 2016-06-15 | 叶伟武 | 一种浒苔人工半咸水生态育苗法 |
CN106416992A (zh) * | 2016-09-28 | 2017-02-22 | 国家海洋局北海环境监测中心 | 一种浒苔专用营养液及其制备方法 |
CN106416992B (zh) * | 2016-09-28 | 2019-05-28 | 国家海洋局北海环境监测中心 | 一种浒苔专用营养液及其制备方法 |
CN112042524A (zh) * | 2020-09-09 | 2020-12-08 | 扬州大学 | 一种快速连续培养浒苔的方法 |
CN113615566A (zh) * | 2021-09-10 | 2021-11-09 | 中国海洋大学 | 浒苔多世代连续培养装置及其培养方法 |
KR102721227B1 (ko) | 2023-11-09 | 2024-10-24 | 주식회사 에프아이씨 | 육상 김 양식 시스템 |
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