Effect of the PSP-causing dinoflagellate, Akwndrium sp. on the initial feeding response of Crassostrea gigas
Abstract- The effects of toxic and non-toxic strains of Alexandrium sp. on the initial feeding responses of the Pacific oyster Cras-sostrea gigas were determined by continuous monitoring of the clearance rate of individual oysters. This was determined fluoro-metrically by loss of fluorescence of liv...
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| Format: | Text |
| Language: | English |
| Published: |
1997
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.611.2906 http://archimer.ifremer.fr/doc/1998/publication-877.pdf |
| Summary: | Abstract- The effects of toxic and non-toxic strains of Alexandrium sp. on the initial feeding responses of the Pacific oyster Cras-sostrea gigas were determined by continuous monitoring of the clearance rate of individual oysters. This was determined fluoro-metrically by loss of fluorescence of live microalgae introduced as food. Feeding oysters with toxic or non-toxic A. tamarense and toxic A. fundyense resulted in stop/start clearance behaviour. In contrast, control oysters fed a reference microalga, Zsochrysis sp., known to support their growth, did not exhibit this behavior. Pacific oysters acclimated to Isochrysis sp., fed mixtures of Alexan-drium / Isochrysis, showed further evidence of stop/start clearance. Exposure for periods up to 48 hours with non-toxic A. tamarense did not enhance clearance of either Alexandrium or Zsochrysis. 0 Ifremer-Elsevier, Paris Crassostrea gigas / feeding physiology I toxic microalgae I dinoflagellate I paralytic shellfish poisoning. Risumk- Effet d’un dinoflagelle producteur de PSP, Alexandrium sp., sur la rCponse alimentaire prkcoce de Crassostrea gigas. Les effets de souches toxiques et de souches non toxiques d’Alexandrium sp. sur la reponse alimentaire precoce de l’huitre creuse, Crassostrea gigas, ont et6 determines grace a un contrble continu du taux de filtration individuel des huitres. Ce taux a et6 Cvalue par la perte de fluorescence, mesuree par spectrofluorimetrie de flux, des microalgues introduites comme nourriture. Qu’elles soient aliment&es avec A. tamarense toxique ou non toxique, ou avec A. fundyense toxique, les huitres ont montre dans tous les cas une activite de filtration du type s ouverture/fermeture B. En revanche, les huitres temoins nounies avec une algue de reference, Isochrysis sp., connue par ailleurs pour ameliorer leur croissance, ne montraient pas ce type d’activite. Les huitres creuses preaccli- |
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