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The effect of two commercial feeds of differing protein content, 35% or 40% (HI-35 and EXP), on Pacific White Shrimp  Litopenaeus vannamei , performance, and system water quality were investigated. Juvenile shrimp were reared in six 40 m 3  indoor raceways containing biofloc-dominated water for 77 days. Performance of EXP-fed shrimp was superior for much of the trial. However, a  Vibrio  outbreak constrained final production. Final survival was significantly higher ( P  &lt; .05) with HI-35 (93.1 ± 1.8%) than EXP (83.4 ± 1.6%). No problematic heavy metal accumulation was observed in culture water or shrimp tissue. Higher feed protein content increased nitrite and nitrate concentrations (maximum of 3.6 mg L −1  NO 2 -N and 401 mg L −1  NO 3 -N in EXP), and alkalinity consumption. Both feeds supported high growth rates (&gt;2 g week −1 ) and yields (7.79–8.21 kg m −3 ), demonstrating their suitability for shrimp culture in super-intensive, biofloc-dominated no exchange systems.

The performance of juvenile Litopenaeus vannamei fed commercial diets of differing protein content, in a super-intensive biofloc-dominated system