Higher feed conversion rate was observed in animals fed with commercial diet; however, diets containing S.platensis showed satisfactory results according to Boyd (1997), indicating good feed conversion rates from 0.9 to 1.5, which van vary depending on the storage density of diets. The same author reported that shrimp cultivation farms obtain feed conversion rate from 2.0 to 2.4. Silva-Neto (2010) evaluated S. platensis as attractive in diets for L. vannamei and showed better feed conversion rates in animals, concluding that this micro alga has the ability to stimulate food intake in animals even at low inclusion levels in the diet.