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Penaeus vannamei were reared on five different experimental diets containing: (1) Saccharomyces cerevisiae at 1%; (2) β-glucan, extracted from S. cerevisiae, at 0.1%; (3) Phaffia rhodozyma at 1%; (4) experimental yeast (HPPR1) at 1% and; (5) a control diet. Wet weight, survival (5) and feed conversion ratio were monitored over a 7-week period. Results indicate that, while there was no significant difference in weight gain on the different diets (P=0.196), survival of animals reared on the diets containing S. cerevisiae, P. rhodozyma and the experimental yeast was significantly higher (P=0.006) than the animals reared on the diet containing β-glucan, and higher, though not significantly, than those reared on the control diet. Biomass was found to be statistically different (P=0.042), the animals reared on the P. rhodozyma diet displaying greater biomass than the animals on the β-glucan diet. Feed conversion ratio was …