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gnathonemus
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gnathonemus
(3Mb mpg).


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Gnathonemus petersii (Guenther, 1862)


- A single specimen of Gnathonemus petersii (Guenther, 1862) hiding in a perspex tube, and emitting pulse-like Electric Organ Discharges (EODs). The organ that produces the EODs lies in the tail. The EODs are several volts strong. The EODs in the video were recorded with two stainless steel rod electrodes at the left of the tank, and made audible via a speaker.  
When an iron ball is lowered into the tank, Gnathonemus is aroused and starts investigating the ball by means of its EODs. Deformations of the EODs by nearby objects are used to detect environmental characteristics (recording by Dr. Tim van Wessel).
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Two specimens of Gnathonemus petersii (Guenther, 1862) emitting Electric Organ Discharges, and showing agonistic behavior. When a second specimen of Gnathonemus is introduced into the tank, an extensive interplay of EODs accompanies the territorial claims. Clearly the fish can detect and recognize each others EODs and communicate through them (recording by Dr. Tim van Wessel).
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.EOD's are used for communication and orientation.
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A single EOD-pulse lasts less than 1 ms.
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