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Bibliographie de l'Institut Maurice-Lamontagne

Mollusques - Bivalves / Crassostrea virginica / Huître américaine, Huître de l'est

McKINDSEY, C.W., M. LECUONA, M. HUOT, A.M. WEISE, 2009. Biodeposit production and benthic loading by farmed mussels and associated tunicate epifauna in Prince Edward Island. Aquaculture, 295(1-2): 44-51.

[Résumé disponible seulement en anglais]
An experimental study was done to evaluate the biodeposition dynamics associated with mussels and two fouling tunicates, Ciona intestinalis and Styela clava, in mussel aquaculture in Prince Edward Island (PEI), eastern Canada. The presence of C. intestinalis on small constructed mussel socks increased biodeposition by a factor of about 2 relative to mussel socks without tunicates. S. clava were small and had a negligible effect on total biodeposition from mussel socks although they increased sedimentation rates relative to that of abiotic control socks. Sinking rates of faecal pellets from large C. intestinalis varied between 1.39 and 6.54 cm s- 1 (LSMean = 2.35 cm s- 1). Using biodeposit production and sinking rates and hydrological data obtained in the present study, footprints of benthic loading due to mussel and tunicate biodeposition for a typical mussel farm in PEI were modelled using Shellfish-DEPOMOD. The results show benthic loading below longlines with C. intestinalis to be ca. 2 times greater than those from lines with only mussels with rates of up to 15.2 g m- 2 d- 1. However, given the greater settling rate of C. intestinalis biodeposits relative to mussel biodeposits, the extent of the footprint (≥ 1 g m- 2 d- 1) is similar or even more restrained. Crown Copyright ©2009 Elsevier B.V.

PERNET, F., R. TREMBLAY, I. REDJAH, J.-M. SÉVIGNY, C. GIONET, 2008. Physiological and biochemical traits correlate with differences in growth rate and temperature adaptation among groups of the eastern oyster Crassostrea virginica. J. Exp. Biol., 211(6): 969-977.

[Résumé disponible seulement en anglais]
We tested two hypotheses in this study: first, that intraspecific growth variations in a marine bivalve are correlated with physiological (basal metabolic rate and scope for growth) and biochemical (membrane lipids) characteristics, and, second, that this bivalve shows intraspecific variations in physiological and biochemical adaptations to temperature. To test these hypotheses, five genetically distinct groups of juvenile oysters Crassostrea virginica that showed differences in their growth rates were maintained in the laboratory (1) for further measurements of growth and standard metabolic rates and (2) subjected to acclimation at 4 °C, 12 °C and 20 °C and further examined for scope for growth and determination of membrane lipid composition. Our results show that a lower basal metabolic rate and lower unsaturation index of membrane lipids coincides with higher growth rates and a higher scope for growth in oysters. We provide evidence that intraspecific differences in basal metabolic rate in oysters are related to membrane unsaturation as predicted by Hulbert's theory of membranes as metabolic pacemakers. Furthermore, our results suggest that the theory of membranes as metabolic pacemakers is related to intraspecific differences in growth. A perfect negative relationship was observed between the acclimation temperature and the unsaturation index of membrane lipids in oysters, as predicted by the homeoviscous adaptation theory. However, changes in the unsaturation index in response to temperature were mainly due to variations in the eicosapentaenoic (20:5n-3) fatty acid in fast-growing oysters, whereas slow-growing animals changed both docosahexaenoic acid (22:6n-3) and 20:5n-3. Thus, the pattern of biochemical compensation in response to temperature in this species shows intraspecific variation.

GIGUÈRE, M., S. BRULOTTE, C. DULUC, F. HAZEL, S. PEREIRA, M. GAUDET, 2007. Recensements de l'huître américaine (Crassostrea virginica) dans le bassin aux Huîtres et la baie Clarke aux Îles-de-la-Madeleine, Québec. Rapp. tech. can. sci. halieut. aquat., 2695, 46 p.

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McKINDSEY, C.W., M.R. ANDERSON, P. BARNES, S. COURTENAY, T. LANDRY, M. SKINNER, 2006. Effects of shellfish aquaculture on fish habitat ; Effets de la conchyliculture sur l'habitat du poisson. DFO, Canadian Science Advisory Secretariat, Research Document ; MPO, Secrétariat canadien de consultation scientifique, Document de recherche, 2006/011, 92 p .

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