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Epidémiologie et facteurs de virulence des bactéries du genre Vibrio responsables de mortalité de crevettes d'élevage en Nouvelle-Calédonie. Perspectives de lutte.

Abstract : New Caledonia has a number of assets for marine shrimp culture. However, its rapid growth encountered a slowdown in 1993, due to the emergence of a seasonal pathology that was named Syndrome 93. Involving bacteria from the Vibrio genus, this disease affects juvenile shrimp during grow out. Strains of significant importance belong to the species Vibrio penaeicida and V. nigripulchritudo and are highly pathogenic to juvenile shrimp. A molecular typing study was conducted in order to clarify their epidemiology and to draw zoosanitary advice. A wide epidemiological survey of V. penaeicida (currently in progress) demonstrates the important impact of ecological events in the outbreak of the disease. Virulence of V. penaeicida was studied as a function of host developmental stage. Toxic factors were shown in bacterial culture supernatants. An hypothesis was drawn regarding the route of entry of these bacterial pathogens into their host. Plasmids harboured by these pathogenic strains are currently being studied with regards to virulence. Means of minimising the impact of Syndrome 93 in grow out ponds have been studied, and zoosanitary practices are discussed. Genetic selection for a disease-resistant shrimp strain seem to be a promising issue. Research outlooks include the study of bacterial ecology in shrimp environment, pathogeny of Syndrome 93 disease with regards to Vibrio virulence factors and the study of the host – pathogen relationship. These future studies could eventually beneficiate from the background knowledge on other Vibrio species.
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Contributor : Cyrille Goarant <>
Submitted on : Monday, June 28, 2010 - 10:43:55 PM
Last modification on : Friday, March 9, 2018 - 11:12:01 AM
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Cyrille Goarant. Epidémiologie et facteurs de virulence des bactéries du genre Vibrio responsables de mortalité de crevettes d'élevage en Nouvelle-Calédonie. Perspectives de lutte.. Autre [q-bio.OT]. Université de Polynésie Française, 2000. Français. ⟨tel-00495067⟩

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