The survival and growth rates of African catfish (Clarias gariepinus) were reported to be affected by light conditions. One
of the methods to understand the effects of light conditions on fish survival and growth rates is through analysing the aggressive
behaviour of the fish. The objective of the present study was to analyse the aggressive behaviours of African catfish juveniles
under different light intensities and light wavelengths. For this purpose, the behaviour of African catfish juveniles (average
body weight = 0.45 ± 0.19; average total length = 35.2 ± 5.0) was observed under three light intensities (0.0014, 0.014, and
1.40 μmoles/m²/s) and five light wavelengths (white, blue, green, yellow, and red). The results showed that the aggressive
behaviour of the fish was significantly affected by light intensities and light wavelengths. Among the three light intensities,
the juveniles showed less aggressive behaviour under 0.0014 μmoles/m²/s. Furthermore, the juveniles also showed less
aggressive behaviour under the yellow light. Therefore, the rearing of African catfish juveniles under of 0.0014 μmoles/m²/s
and yellow light wavelength is recommended
