1. DSM Nutritional Products; Research Centre for Animal Nutrition & Health; BP 170 Saint-Louis cedex France
2. Finnish Game & Fisheries Research Institute; Survontie 9 40500 Jväskylä Finland
3. Sparos & CCMAR; University of Algarve; Campus Gambelas 8005-139 Faro Portugal
4. Universidade de Trás-os-Montes e Alto Douro; Quinta dos Prados, P.O. Box 1013 5001-801 Vila Real Portugal
5. Centre for Fish and Wildlife Health, National Fish Disease Laboratory, Institute of Animal Pathology; University of Bern; Länggassstrasse 122, P.O. Box 8466 CH-3001 Bern Switzerland
6. DSM Nutritional Products; Analytical Research Centre; Wurmisweg 576 4303 Kaiseraugst Switzerland