Abstract
A relationship between foraging behavior and energy budget was investigated for Pseudorasbora parva. Energetic costs of the fish while engaging in swimming and energetic gain by foraging were calculated using a mathematical model. High flowing speed, satiation level and integrated energy consumption increased the duration of stay in the cavity for shelter and the rate of capturing prey in front of the fish. When the flow condition was above 7cm/s, the fish activity and net energy gain by foraging decreased. Fish compensated for energy losses with increasing capture of prey below the flow condition of 7cm/s.
