1. AZTI Tecnalia, Marine Research Division, Herrera Kaia Portualdea z/g; 20110 Pasaia, Spain.
2. AZTI Tecnalia, Marine Research Division, Txatxarramendi Ugartea z/g, 48395 Sukarrieta, Spain.
3. IFREMER, Laboratoire Science et Technologie Halieutique, 8 rue François Toullec, 56100 Lorient, France.
4. IFREMER, Nantes, P.O. Box 21105 F-44311 Nantes Cédex 03 France.
5. Independent consultant, Fjellveien 96, N-5019 Bergen, Norway.