The aim of this study was to determine the effect of two feeding regimes (7 vs 6 d) and three commercial foods (TO= Tomasino®, NA= Naltech® and SA= Salmofood®) on the productive-commercial performance and organ development. of rainbow trout in the fattening phase under conditions of Lake Titicaca, Peru. A total of 1080 trout of 185 g live weight (LW), 26.5 cm total length (TL) and 1.00 body condition index (BCI) were randomly placed in 36 1.2x1.2x1.6 m nylon cages (30 trout/cage). The control of productive parameters (LW, TL and feed consumption) was carried out at 30, 60 and 90 d. The BCI, the mean daily feed intake (DFI), the mean daily weight gain (DWG) and the feed conversion ratio (FCR) were determined. The carcass yield (CY), fillet yield (FY), pigmentation (MP) and the relative weight of the organs were determined at 215 d. The feeding regime did not affect the LW, TL and BCI, ...