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Abstract

Investigations on the diurnal rhythm of the motoric and electric activity were performed with the electric fish Gnathonemus petersii. A group of 11 conspecifics as well as single fishes showed an increased electric and motoric activity at night, especially at the beginning and end of the dark phase and also during feeding. These normal diurnal rhythms were changed for at least 3 days by the aggressive behaviour of two fishes who were set together for the first time. During this time an order of precedence was established.