Temporal and Spatial Dynamics of Vibrio harveyi: An Environmental Parameter Correlation Investigation in a 4-Metre-Deep Dicentrarchus labrax Aquaculture Tank
Résumé
Nowadays, European seabass (Dicentrarchus labrax) aquaculture is undergoing a significant
expansion. Nevertheless, the aquaculture industry is plagued by vibriosis. The spatial and temporal
dynamics of Vibrio harveyi were studied on a European seabass farm in northern France during seven
months of 2022. Concrete specimens were suspended and water was pumped from different depths
(0.3 m, 2.15 m and 4 m deep), providing insights into the biofilm and planktonic V. harveyi dynamics.
The abundances of V. harveyi, in the biofilm and free-living forms, were positively correlated. The
water parameters revealed seasonal fluctuations in temperature, pH, and salinity, with no significant
differences observed across the water column. Quantification of V. harveyi revealed no significant
differences between depths, but seasonality, with peak abundances observed in August, correlated
with temperature increases. Principal component analysis identified temperature as a primary driver,
but also additional parameters, such as salinity and pH. Vibriosis occurred during the sampling
period, providing valuable insights into the conditions before, during, and after the outbreaks. This
study underscores the importance of understanding V. harveyi behaviour in aquaculture, particularly
in the context of global warming, for effective disease management and sustainable practices.
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