1. Centre for Environment, Fisheries and Aquaculture Science (Cefas), Pakefield Road, Lowestoft NR33 0HT, UK
2. International Commission for the Conservation of Atlantic Tunas (ICCAT), C/Corazón de María, 8, 28002 Madrid, Spain
3. Wageningen Institute for Marine Resources and Ecosystem Studies (IMARES), IJmuiden, The Netherlands
4. Aquaculture and Fisheries Group, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands