Flathead catfish (Pylodictis olivaris) in Oklahoma lakes and rivers were sampled using gasoline-powered generators with variable voltage pulsators (VVP), magneto «telephone» generators, and micro-electronic «pacemaker» electrofishing devices. VVP gear produced the highest numbers of flathead observed surfacing (O/f) and collected (C/f) per electrofishing attempt. Telephones and pacemakers produced somewhat lower Olf and Clf values but length frequencies were similar to VVP samples. Pulse frequencies of 20 Hz appeared to be the most critical electrical output parameter influencing catch rates, with electrode configuration, site selection, and water temperature also being contributing factors. Assistance of a «chase» boat to aid picking up surfacing catfish is recommended for all gear.
