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Modelling the accumulation of PSP toxins in Thau Lagoon oysters (Crassostrea gigas) from trials using mixed cultures of Alexandrium catenella and Thalassiosira weissflogii

Published online by Cambridge University Press:  17 May 2007

Patrick Lassus ,
Zouher Amzil ,
Régis Baron ,
Véronique Séchet ,
Laurent Barillé ,
Eric Abadie ,
Michèle Bardouil ,
Manoella Sibat ,
Philippe Truquet  and
Jean-Baptiste Bérard
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Patrick Lassus
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
Zouher Amzil
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
Régis Baron
Affiliation:
IFREMER, STAM, BP 21105, 44311 Nantes Cedex 3, France
Véronique Séchet
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
Laurent Barillé
Affiliation:
Université de Nantes, Laboratoire d'Ecophysiologie marine intégrée, EA 2663, Faculté des Sciences et des Techniques, BP 92208, 44322 Nantes Cedex 3, France
Eric Abadie
Affiliation:
IFREMER, LERLR, Station de Sète, avenue Jean Monnet, BP 171, 34203 Sète Cedex, France
Michèle Bardouil
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
Manoella Sibat
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
Philippe Truquet
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
Jean-Baptiste Bérard
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
Marielle Gueguen
Affiliation:
IFREMER, EMP, BP 21105, 44311 Nantes Cedex 3, France
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Abstract

In October and November 2003 a bloom of the toxic dinoflagellate Alexandrium catenella was observed in the North-east zone of Thau lagoon (French Mediterranean coast). Sea water samples were collected every hours to evaluate time-related variations of phytoplankton concentrations and to compare the relative ratio of A. catenella versus other phytoplankton species during the outbreak. From these observations, trials using recirculated sea water systems were performed to: i) evaluate the physiological effects on oyster of increasing proportions of A. catenella within a mixed microalgal diet where the non-toxic diatom Thalassiosira weissflogii was present at concentration: 1500 cells ml−1, ii) compare the effect of two temperatures (12 °C and 18 °C) on paralytic toxin accumulation rates in oyster flesh by ion-pairing high performance liquid chromatography (IP-HPLC) detection, iii) analyse toxin biotransformation during the contamination process, iv) evaluate the role of the different types of oyster tissue on the bioaccumulation mechanism.

The results showed: i) a significant effect of temperature increase on clearance rate and toxin uptake, ii) no detectable time-related effects of toxic algal food on pre-ingestion sorting or on toxin profiles in oyster flesh, iii) either negative or positive effects of A. catenella concentrations on toxin uptake (“threshold” effect), iv) high amounts of toxins in the digestive gland, accounting for more than 80% of overall shellfish toxicity. The daily amount of toxins (Qtox) taken up by each oyster was evaluated by means of a global one-compartment model. However a two-compartment model finally gave the best match with real contamination kinetics, since it integrated both toxins sequestered in oyster tissues and toxins moving in through the digestive tract.

Keywords

Paralytic shellfish poisoningCrassostrea gigasModeltoxin contentAlexandrium catenellaMediterranean Sea
Type
Research Article
Information
Aquatic Living Resources , Volume 20 , Issue 1: New developments in coastal environment research: results from the national coastal environment program , January 2007 , pp. 59 - 67
Copyright
© EDP Sciences, IFREMER, IRD, 2007

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