The interventions of river restoration have to be done with appropriate environmental monitoring. The defragmentation of the artificial barriers, the restocking of some native species and the control of the invasive alien species, foreseen in the IdroLIFE Project, need adequate environmental investigations, before and after the intervention. The capture with electrofisher allows the temporary sample of the fish fauna that is kept only for the needed period of time in order to measure and count it, before the final releasing in the same waters from which it was sampled.