Weak electric discharges generated by the two species of the African upside-down catfishes, Synodontis sorex and S. batensoda are described. In both species two types of discharges were recorded in the course of aggressive-defense interactions in the pairs of individuals: short simple biphasic and longer (duration >20 ms) discharges with more complex waveform. The discharges of the latter type seem to result from a temporal summation (with various latency) of simple discharges. It is suggested that formation of the long quasimonopolar discharges enhances the coincidence of frequency spectrum of the catfish discharges with maximum sensitivity range of their ampullary electroreceptors.
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Article Synopsis
- The study investigates the spontaneous generation of weak electric discharges in solitary Synodontis caudovittatus fish, noting amplitudes of 0.4-1.0 mV and a frequency of 3-9 minutes.
- When tested in pairs, these fish exhibited increased electric discharge amplitudes (up to 30-45 mV) and longer pulse durations (20-25 ms) during aggressive interactions, unlike S. eupterus, which only produced discharges during these interactions.
- The research highlights the significance of electrocummunication among catfish, particularly focusing on changes in discharge polarity and duration during competitive behaviors.
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