An eleven-week feeding trial was conducted to evaluate the growth effect of partial replacement of fishmeal by
the microalga Spirulina platensis in the diet of juvenile Pacific white shrimp Litopenaeus vannamei (Boone). The results
clearly indicate that Spirulina platensis constitutes an effective food ingredient for shrimp. Growth rates of a Spirulina-fed
group differed highly significantly (p < 0,001) compared to two groups fed to less suitable diets and were slightly, even
though not significantly superior to that based on an optimal commercial reference fish diet. As a side effect, Spirulinafed
shrimps showed measurable differences in pigmentation.