1. Scottish oyster mortality event and association with Vibrio aestuarianus
- Author
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Bean, Tim P., Farley, Hannah, Nascimento-Schulze, Jennifer, and Regan, Tim
- Abstract
Pacific oysters, Crassostrea(Magallana) gigas,are the most commonly cultured invertebrate species globally. Recent years have seen outbreaks of summer mortality across the globe, mainly caused by viral and bacterial pathogens such as OsHV-1 µvar and Vibriospp. Despite isolated outbreaks in southern England, the UK has remained largely free from these pathogens. A summer mortality event in Scotland was investigated after Vibriospp.were implicated. We identified two key Vibriospecies (V. aestuarianusand V. splendidus) but complete absence of OsHV-1. There was a high prevalence of V. aestuarianusamong moribund and dead oysters, along with an increase in V. aestuarianusdetected in the water column and sediment. In accordance with strains associated with oyster mortalities elsewhere in Scotland and mainland Europe, V. aestuarianusfrom this site belongs to Lineage A. Whilst V. splendidus,could be cultured from most infected tissue samples, V. aestuarianuscould not be cultured from from frozen tissue , only from unfrozen infected tissue. In vivoinfection experiments with V. aestuarianusresulted in significantly higher mortalities than with V. splendidusand were exacerbated by increased temperature. These findings suggest that mortalities are caused by V. aestuarianus, which may have been intensified by handling stress and rising temperatures.
- Published
- 2024
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