1 This paper describes a method for electroencephalographic recording from unanesthetized and unraistrained european eels (Anguilla anguilla L.). 2 EEG's records from the cerebellum, tectum opticum, telencephalon and olfactory bulb of the eel are compared with other fish previously studied by other authors. 3 Averaged evoked visual potentials from the telencephalon, tectum opticum and cerebellum are presented. 4 This study provides a reference point for future research on fish vigilance depth and EEG changes associated with modified environmental factors.