M. Carla Piazzon is Postdoctoral Researcher at the Institute of Aquaculture Torre de la Sal, CSIC, Spain. Geert Wiegertjes is Full Professor and Head of the Aquaculture and Fisheries Group at the University of Wageningen, The Netherlands. James E. Bron is Professor of Aquatic Animal Health at the Institute of Aquaculture, University of Stirling, UK. Ariadna Bobadilla is Full Professor and Head of the Fish Pathology Group at the Institute of Aquaculture Torre de la Sal, CSIC, Spain