These swimming speeds were slightly greater but close to the recommendations set forth by Davison (1997). From weeks 9–13 average swimming speeds increased to 2.03 ± 0.07 and 1.87 ± 0.06 bl/s for the high and low NO3-N, treatments respectively, and therefore exceeded the recommendation of ≤1.5 bl/s (Davison, 1997). Jain et al. (1997)determined that the “fatigue swimming velocity” for rainbow troutwas 2.10 ± 0.06 bl/s