African catfishes clariidae: A new group of weakly electrical fish

Publication Type:Journal Article
Year of Publication:1996
Authors:V. D. Baron, Orlov, A. A. , Golubtsov, A. S.
Journal:Izvestiya Akademii Nauk Seriya Biologicheskaya Moscow
Keywords:Animals-; Chordates-; Fish-; Nonhuman-Vertebrates; Vertebrates-, Behavior-; Biochemistry-and-Molecular-Biophysics; Ecology- (Environmental-Sciences); Evolution-and-Adaptation; Membranes- (Cell-Biology), Clarias-gariepinus (Osteichthyes-), electric-organ; electrocommunication-; electroreceptor-system; evolution-, Osteichthyes-: Pisces-, Vertebrata-, Chordata-, Animalia-

Clariid catfishes have an electroreceptor system but lack electrical organs. We showed that at least one representative of the Clariidae Clarias gariepinus is capable of generating weak monophasic electric pulses. These pulses markedly exceed in length the electrical organ discharges in all freshwater electric fishes known so far. According to the spectral composition, long-term electric organ discharges of Clarias fall in the frequency range of highly sensitive electric receptors, thus suggesting their involvement in intraspecific electrocommunication. Specific discharges of the electric organ in Clarias are of special interest from the viewpoint of the origin and evolution of the electric organ in catfishes.

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