Аннотация:The experiments performed with the nine-spined stickleback Pungitius pungitius demonstated that the presence of 5 × 10–4 M (0.42 μg) highly attractive amino acid L-glutamine in the pellet is enough to significant displacement of the consumption level. Concentration of L-glutamine 10–4 M is significant for changing parameters of fish behavior during the orosensory testing of artificial pellets.