Modulation des paramètres hémocytaires par la nutrition de l'huitre creuse Crassostrea gigas. Implication dans les mortalités estivales

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Contributeur(s) Université de Rennes 1
Identifiant documentaire 9-357
Identifiant OAI oai:archimer.ifremer.fr:357
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Auteur(s): Delaporte, Maryse
Mots clés Summer mortalities Flow cytometer Immunity Oxidative burst Phagocytosis Biochemical composition hemocyte parameters Essential fatty acids Nutrition Crassostrea gigas Mortalités estivales Cytomètre de flux Immunité Poussée respiratoire Phagocytose Réponses hémocytaires Composition biochimique Acides gras essentiels Nutrition Crassostrea gigas
Date de publication 18/03/2005
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In the context of Pacific oyster C. gigas summer mortality, the present study demonstrated that the reproductive effort reduced not only the energetic parameters (carbohydrates and CEA) but also the immune parameters (concentration, phagocytosis and adhesive capacity of hemocytes). Increasing food supply from 4% to 12% (of oyster dry weight) did not counteract this phenomena as most of the additional energy was dedicated to the gametogenesis processes. However, after the gametogenesis, the 12% diet clearly favored energy storage restoration and hemocyte production. Hemocyte parameters were also modulated by the food quality. Indeed, hemocyte concentration tended to increase 20:5n-3 and/or 20:4n-6 were supplied by micro-algae or artificial diets. When these fatty acids were supplied separately, it has been demonstrated that 20:4n-6 stimulated phagocytic activity and reactive oxygen species production by hemocytes while 20:5n-3 inhibited it
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