Electric Organ Discharge
Petrocephalus microphthalmus produces EODs of short duration, which is typical of the entire genus. No sex differences have yet been reported in any population. Similar EOD durations have been observed in the Odzala population of P. microphthalmus (range = 0.252 – 0.511 msec) and among conspecifics from Gabon (range = 0.380 – 0.561 msec). A relatively long, slow rise characterizes the initial part of the first head–positive phase in EODs recorded from the Odzala population, often resulting in a shoulder early during the waveform’s head-positive rise to P1, the first main peak. The early head-positive rise and shoulder are very low in amplitude, however, such that they may only be apparent at high amplifier gain. These subtle waveform features appear to be uncommon in EODs of other Petrocephalus species. A similar slow rise (and shoulder) preceding P1 has been recorded among a small number of P. microphthalmus individuals from Gabon, but it seems to be much less common than in Odzala.
Based on histological examination, electrocytes are known to be type NPp.
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