Prawn farming has grown in popularity since its introduction to Bangladesh in the early 1980s and is now widely practised in coastal areas. In Bangladesh, the main fish feed ingredients for prawn farming are rice bran, maize, soya bean meal, mustard oil cake, fish meal and meat and bone meal. This study was designed to evaluate the suitability of variable concentrations of low-cost oil-extracted sunflower cake in the diet for freshwater prawn M. rosenbergii in freshwater gher aquaculture system of Southern Bangladesh.