1. National Institute of Aquatic Resources Technical University of Denmark Kongens Lyngby 2800 Denmark
2. Department of Animal Science Iowa State University Ames IA 50011‐3150 USA
3. Division of Animal Sciences Department of Agricultural and Food Sciences University of Bologna Viale G. Fanin 46 Bologna 40127 Italy
4. Centro di ricerca di Zootecnia e Acquacoltura Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria (CREA) Rome 00198 Italy
5. Panittica Italia Società Agricola Srl Torre Canne di Fasano Brindisi 72016 Italy