報告書番号

V05033

タイトル（和文）

海域試験によるアカフジツボ抽出物のフジツボ着生誘起効果の評価

タイトル（英文）

Field experiments on larval settlement inducing effects of pheromones for the barnacle Megabalanus rosa

概要 （図表や脚注は「報告書全文」に掲載しております）

フジツボ類キプリス幼生は探索行動により着生基盤を選択して付着・変態を行うが、その際には、同種の着生誘起物質（フェロモン）が大きな役割を担うと考えられる。これらのフェロモンなどの構造と機能を明らかにし、着生メカニズムを解明することで、新たな発想による付着生物対策技術の開発につながる可能性は高いが、それらに関する知見は非常に乏しい。そこで、実海域で付着板を使った付着実験を行い、成体フジツボの抽出液が大型汚損生物種であるアカフジツボキプリス幼生に与える効果を調べた。その結果、アカフジツボ抽出液を保持するための担体としてはスレート板が望ましく、スレート板上にフジツボ抽出液を塗布し乾燥させた後に浸漬試験を行った場合に、無処理のスレート板と比較して有意にフジツボの付着率が上昇した。また、その付着量は最大で無処理の5倍以上となり、スレート板上の付着場所は抽出液処理した窪みに集中する事が明らかとなった。

概要 （英文）

Barnacles are major fouling organisms in cooling water systems at electric power stations. To prevent settlement of fouling organisms such as barnacles, various antifouling techniques have been used. One of the most generally methods is antifouling coating including metal-based compounds, however the environmental effects of the metal-based compounds have been getting serious problems owing to their toxicity and action as endocrine disruptors. In order to develop ‘environmentally benign’ antifouling paints, several studies on antifouling paints applied natural antifouling products from marine organisms and some of which have been shown to be candidates for practical antifoulants. However, they have not yet been used commercially. On the other hand, basic research on settlement mechanisms of larvae in fouling sessile organisms must be useful for development of ‘environmentally benign’ antifouling technology. In this study, we examined whether settlement pheromone induce gregarious settlement of barnacle in the field. Field experiments using crude extracts of adult barnacles were carried out at Shizugawa bay, Miyagi. Adult extracts including settlement pheromone of the barnacles (Megabalanus rosa and Amphibalanus amphitorite) were prepared and applied onto slate plate or webron paper fixed on PVC plates, then the treated test plates were suspended with untreatment plates (control) at a depth of 3.0m for some days (3days-37days). After the test period, barnacles which settled on the plate’s surface were counted. When adult extracts were applied onto slate plates, barnacles dominantly settled on their surface in comparison with control surface. These results suggested that settlement pheromones induce affect contributes gregariousness or gregarious settlement barnacles not only in the laboratory but also under field conditions.

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