1. Department of Veterinary Medical Sciences, Alma Mater Studiorum University of Bologna, Via Tolara di Sopra 50, 40064 Ozzano Emilia (BO), Italy.
2. Fish Pathologist, Private Expert, SIAV B, ASL Lecce, Viale Don Minzoni, 73100 Lecce, Italy.
3. Department of Life Sciences, University of Trieste, Via Giorgieri 10, 34127 Trieste, Italy and Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy.