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This study evaluated the population growth of rotifer, Brachionus rotundiformis (Tschugunoff, 1921) cultured in different colour backgrounds at two photoperiods under non-axenic condition. Polyethylene tetrachloride bottles of different colours were used as experimental culture units with initial stocking density of 5 rotifers mL-1. The cultures were fed daily with Chlorella sorokiniana Shihira and Krauss, 1965 at 1.0 x 106 cells mL-1 under ambient condition (28.2±0.6°C). Five colour backgrounds (red, black, white, blue, and yellow), and two photoperiod regimes (24-h illumination, and 1:1 light-dark photoperiod) were assigned as treatments; each replicated thrice and set in completely randomized design. Significant variation among colour treatments were observed (F = 7.97, df = 4, p< 0.01), with black background having the highest total mean population growth (4.32 x 105 ± 9.97 x 104) in 24-h illumination, and in 1:1 light-dark photoperiod (2.80 x 105 ± 5.30 x 104). Pooled rotifer densities of treatments cultured in 24-h illumination was higher compared to 1:1 light-dark photoperiod but not statistically significant (t = 1.26, p 0.05). Specific growth rates were observed to be highly significantly different among treatments, with black having better specific growth rates (89-90% per day) in both photoperiods. This study demonstrated that B. rotundiformis reared in black background had better population growth performance compared to other environmental colorations, with no profound photoperiod effect.