Journal of Invertebrate Pathology | VOL. 196
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Crassostrea gigas oysters from a non-intensive farming area naturally harbor potentially pathogenic vibrio strains

Publication Date Feb 1, 2023

Abstract

Farming intensification and climate change are inevitably linked to pathogen emergence in aquaculture. In this context, infectious diseases associated with vibrios span all developmental stages of the Pacific Oyster Crassostrea gigas. Moreover, virulence factors associated with pathogenicity spread among the vibrio community through horizontal gene transfer as part of the natural eco-evolutive dynamic of this group. Therefore, risk factors associated with the emergence of pathogens should be assessed before the appearance of mass mortalities in developing rearing areas. In this context, we characterized the vibrios community associated with oysters cultured in a non-intensive area free of massive mortalities located at Tongoy bay, Chile, through a culture-dependent approach. We taxonomically affiliated our isolates at the species level through the partial sequencing of the heat shock protein 60 gene and estimated their virulence potential through experimental infection of juvenile C. gigas. The vibrio community belonged almost entirely to the Splendidus clade, with Vibrio lentus being the most abundant species. The virulence potential of selected isolates was highly contrasted with oyster survival ranging between 100 and 30%. Moreover, different vibrio species affected oyster survival at different rates, for instance V. splendidus TO2_12 produced most mortalities just 24h after injection, while the V. lentus the most virulent strain TO6_11 produced sustained mortalities reaching 30% of survival at day 4 after injection. Prod...

Concepts

Vibrio Community Crassostrea Gigas Pacific Oyster Crassostrea Gigas Tongoy Bay Oyster Crassostrea Gigas Oyster Survival Emergence Of Pathogens Culture-dependent Approach Horizontal Gene Transfer Virulence Potential

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