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1) The a.c. sensitivity of the electroreceptors of the brown bullhead, Ictalurus nebulosus LeS., could be controlled by applying direct current stimuli with current densities of 2 × 10-7 to 2 × 10-5 A/cm2. 2) These effects bear a tonic character and may last up to 15 minutes. 3) Increases or decreases in the electroreceptor's sensitivity caused by alterations in the ionic contents of the animals environment, could also be compensated by applying direct current stimuli. 4) The implantation of electrodes in intact animals was strongly improved by the use of cocoa butter for electrical insulation and mechanical fixation. 5) Implications of the voltage controlled sensitivity of the electroreceptors are discussed.