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Gut passage times in two bivalve molluscs fed toxic microalgae: Alexandrium minutum, A. catenella and Pseudo-nitzschia calliantha

Published online by Cambridge University Press:  05 April 2008

Marielle Guéguen ,
Patrick Lassus ,
Mohamed Laabir ,
Michèle Bardouil ,
Régis Baron ,
Véronique Séchet ,
Philippe Truquet ,
Zouher Amzil  and
Laurent Barillé
Marielle Guéguen
Affiliation:
Ifremer, Laboratoire Phycotoxines, BP 21105, 44311 Nantes, France
Patrick Lassus
Affiliation:
Ifremer, Laboratoire Phycotoxines, BP 21105, 44311 Nantes, France
Mohamed Laabir
Affiliation:
Laboratoire Ecosystèmes lagunaires, UMR CNRS-UM2 5119 case 093, Université Montpellier 2, place Eugène Bataillon, 34095 Montpellier, France
Michèle Bardouil
Affiliation:
Ifremer, Laboratoire Phycotoxines, BP 21105, 44311 Nantes, France
Régis Baron
Affiliation:
Ifremer, Département STAM, BP 21105, 44311 Nantes, France
Véronique Séchet
Affiliation:
Ifremer, Laboratoire Phycotoxines, BP 21105, 44311 Nantes, France
Philippe Truquet
Affiliation:
Ifremer, Laboratoire Phycotoxines, BP 21105, 44311 Nantes, France
Zouher Amzil
Affiliation:
Ifremer, Laboratoire Phycotoxines, BP 21105, 44311 Nantes, France
Laurent Barillé
Affiliation:
Laboratoire d'Ecophysiologie marine intégrée EA 2663, BP 92208, 2 rue de la Houssinière, 44322 Nantes Cedex 3, France
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Abstract

The occurrence of new phytoplankton species in a coastal area may be explained by the import of shellfish containing whole live algal cells in their digestive tracts. Indeed, shellfish containing toxic algal cells can induce both primary contaminations in safe areas (initially free from toxic microalgae), and secondary contaminations of other shellfish growing in the same area via the faeces of the imported animals. To mitigate this problem, shellfish need to be placed in a separate holding tank and their intestinal content purged. For a deeper understanding of the risks associated with transferring contaminated shellfish, oysters (Crassostrea gigas) and mussels (Mytilus edulis) were purposely fed either Alexandrium minutum or A. catenella (Dinophyceae) or Pseudo-nitzschia calliantha (Bacillariophyceae) toxic algae for 2 h. They were then transferred into individual tanks where they were continuously fed with a non-toxic alga, Tetraselmis suecica. Biodeposit production, faeces composition, and filtration rates were monitored for the shellfish over a 6-h period. The effect of temperature differences and different initial toxic algae concentrations were compared. This study revealed a relationship between temperature and cell lysis in the oyster digestive tract. It also indicated that toxic algae concentration did not seem to influence gut passage time in oysters, while a significant effect was observed in mussels, and confirmed the existence of a difference between oyster and mussel feeding patterns.

Keywords

Crassostrea gigasMytilus edulisGut passageUptakeToxic phytoplanktonRisk assessment
Type
Research Article
Information
Aquatic Living Resources , Volume 21 , Issue 1 , January 2008 , pp. 21 - 29
Copyright
© EDP Sciences, IFREMER, IRD, 2008

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