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The use of attractants in formulated feeds has become paramount to economic success owing to the need to optimize feed conversion rates by maximizing consumption and reducing feed waste so as to lower production costs. Taking into account the importance of attractants, a series of experiments designed to evaluate the potential of natural molecules was carried out with the freshwater prawn, Macrobrachium rosenbergii (De Man, 1879). Two biogenic amines (putrescine and cadaverine) and two sexual pheromones (crab urine and freshwater prawn green gland extracts) were compared with reference products proven to be major attractants, such as squid extracts and a commercial product. These were incorporated in a basal diet designed to be non‐attractive. Results were obtained by three different approaches. First, a laboratory bioassay was conducted to evaluate the time that lapsed as an animal …