Abstract: We investigated the repellency of electric barriers with different electrical parameters in still water and flowing water of 0.3 and 0.7 m·s^-1 on three protected species from the Dadu River, Schizothorax prenanti, Schizopygopsis malacanthus, and Euchiloglanis kishinouyei. Twelve treatments, including three pulse voltages (26, 30 and 36 V) and four pulse frequencies (3, 5, 8 and 12 Hz), were conducted at each velocity at 18-20.5 ℃ of water temperature and 248-270 μS·cm^-1 of water conductivity. The results showed that the barrier had the best repellent effect harmlessly on the three fish species with the pulse voltage of 36 V and pulse frequency of 5 Hz in all the three flow conditions. Despite the declined interception rate and the sensing distance of all the three fish species with higher flow velocity, there was no significant difference. The escaping response of the three fish species at given electric settings can serve as the basis for electric barriers design of fish and lay a foundation for their conservation.

Key words: electrical barrier, pulsed direct current, electrical parameter, Schizothorax prenanti, Schizopygopsis malacanthus, Euchiloglanis kishinouyei.