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Diseases of Aquatic Organisms

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DAO 140:47-54 (2020)  -  DOI: https://doi.org/10.3354/dao03489

Atypical Aeromonas salmonicida vapA type V and Vibrio spp. are predominant bacteria recovered from ballan wrasse Labrus bergylta in Scotland

A. Papadopoulou1,3, T. Wallis2, J. G. Ramirez-Paredes1,2, S. J. Monaghan1, A. Davie1,*, H. Migaud1, A. Adams1

1Institute of Aquaculture, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK
2Ridgeway Biologicals Ltd, a Ceva Santé Animale company, Units 1-3 Old Station Business Park, Compton, Berkshire RG20 6NE, UK
3Present address: The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Campus, Midlothian EH25 9RG, UK
*Corresponding author:

ABSTRACT: Healthy and/or moribund farmed and wild ballan wrasse Labrus bergylta (>0.5 to 900 g) were sampled from hatcheries (n = 2) and Atlantic salmon Salmo salar cage sites (n = 8) in Scotland between February 2016 and October 2018. Less than half of the sampled individuals (n = 43; 32.3%) had been vaccinated (autogenous polyvalent vaccine; dip and/or injection) against atypical furunculosis (type V and VI), while 20 (15.0%) fish were not vaccinated, and the rest (70 individuals, 52.7%) were of unknown vaccination status. Swab samples from skin lesions, gill, liver, spleen and kidney were inoculated onto a variety of bacteriological agar plates, and bacteriology identification and sequencing analysis was performed on significant bacterial colonies. Atypical Aeromonas salmonicida (aAs) vapA type V was the predominant bacterial species (70/215 bacterial isolates, 32.5% of bacterial samples; 43/117 positive individual fish, 36.8%) isolated in this survey followed by Vibrio species, which were the most geographically prevalent bacteria. Photobacterium indicum/profundum was also isolated from L. bergylta for the first time during this study. The collection of these bacterial isolates provides useful information for disease management. Identifying the aAs isolates involved in disease in ballan wrasse could provide vital information for improving/updating existing autogenous vaccines.


KEY WORDS: Atypical Aeromonas salmonicida · Ballan wrasse · Health survey · Cleaner fish


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Cite this article as: Papadopoulou A, Wallis T, Ramirez-Paredes JG, Monaghan SJ, Davie A, Migaud H, Adams A (2020) Atypical Aeromonas salmonicida vapA type V and Vibrio spp. are predominant bacteria recovered from ballan wrasse Labrus bergylta in Scotland. Dis Aquat Org 140:47-54. https://doi.org/10.3354/dao03489

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