1. Laboratory for Microbiology1 and
2. Laboratory for Aquaculture and Artemia Reference Center,2University of Ghent, 9000 Ghent, Belgium;
3. Centro Nacional de Acuicultura e Investigaciones Marinas “Edgar Arellano M.” CENAIM, Campus Politécnico (ESPOL), Guayaquil, Ecuador3; and
4. CIAD/Mazatlan Unit for Aquaculture and Environmental Management, Mazatlan, Sin., Mexico 820004