The colour of light is a very important environmental factor that affects fish physiology. The aim of the present study was to evaluate the effects of different colours of light on weight gain, length, condition factor and specific growth rates of the juvenile rainbow trout Oncorhynchus mykiss. The study employed fertilized eggs that were exposed separately to seven colour lamps including white (573 nm, control), azure (397 nm), blue (459 nm), green (524 nm), yellow (586 nm), orange (611 nm) and red (742 nm). The experiment was conducted for 5 months (from fertilization until the fish reached 2 g wet weight) at the Sheshpir fish farm (west of Fars province), Iran. After yolk sac absorption, the weight and length of randomly sampled fish were measured monthly. The results showed that weight parameters of fish exposed to yellow (0.562 ± 0.13) and white (0.547 ± 0.13) coloured light were higher (p ≤ 0.05) than fish subjected to the other colours. The highest length growth was observed in fish exposed to yellow (3.91 ± 0.16) and white (3.61 ± 0.10) light, respectively. The highest growth rate (4.641 ± 0.29) and condition factor (2.00 ± 0.03) were observed in fish maintained under yellow light.
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