^aLaboratory of Fish Nutrition and Pathology, National Centre for Marine Research, Aghios Kosmas 16604, Ellinikon, Attiki, Greece

^bSchool of Life Sciences, University of Kingston, Kingston upon Thames, KT1 2EE Surrey, London, UK

^cHPLC Laboratory, Department of Residue Research, Institute of Vetinary Research of Athens, National Agricultural Research Foundation, 25 Neapoleos Street, Agia Paraskevi 15310, Athens, Greece

^dFaculty of Veterinary Medicine, School of Health Sciences, University of Thessaly, Karditsa, 43100, Greece

^eEnvironmental Monitoring Unit, ETC Building, Brunel University, UB8 3PH, Middlesex, UK