Electric discharges of the African catfishes Clarias anguillaris and Heterobranchus longifilis

Electric discharges of two African catfishes of the genus Auchenoglanis (Claroteidae, Siluriformes)

“…In addition to previously described regular bursts of short biphasic pulse like discharges [7], long lasting pulse like biphasic discharges with a shorter initial phase of 2-3 ms duration and with a considerably longer second phase (20-70 ms) were obtained (Figs. 1a, 1b).…”

“…No such studies were made on this species. In addition, our study presents new data on the character of electric discharges in Auchenoglanis occidentalis, the first spe cies of this family in which the electric activity was dis covered [7].…”

“…Mochokidae) [1][2][3][4], genera Clarias and Heterobranchus (fam. Clariidae) [5,6] and in one representative of the genus Auche noglanis (fam. Claroteidae) [7].…”

“…Clariidae) [5,6] and in one representative of the genus Auche noglanis (fam. Claroteidae) [7]. Significant differences in characteristics of discharges motivated the assump tion of independent origin of electric organs in cat fishes of different families [8] though morphological data indicate phylogenetic relationship between the families Claroteidae and Malapteruridae [9].…”

“…In the same region and in the Angereb and Dinder, two rivers of the Nile basin in western Ethiopia, nine spec imens of A. occidentalis (SL, 140-310 mm) were caught. The experiments were made under field con ditions using previously applied methods [6,7] with some modifications. The captured fish were immedi ately placed to plastic 40 L containers with continu ously aerated water, where they were maintained prior to experiments for 2 h to several days.…”