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.

中文翻译：

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在两个非洲颠倒的Cat鱼Synodontis sorex和S. batensoda（Mochokidae，Siluriformes）的电发生。

描述了两种非洲颠倒cat鱼物种Synodontis sorex和S. batensoda产生的微弱放电。在这两个物种中，在成对个体的攻击-防御相互作用过程中记录了两种类型的放电：短的简单双相放电和较长的（持续时间> 20 ms）放电，波形更复杂。后一种类型的放电似乎是由简单放电的时间总和（具有各种等待时间）引起的。建议长准单极放电的形成增强the鱼放电的频谱与壶腹电感受器的最大灵敏度范围的重合。