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Stichting De Traditie - Electroreception videos    

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apteronotus
(3 Mb mpg).
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apteronotus
(7 Mb mpg).
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Apteronotus albifrons (linnaeus, 1766)


- A single specimen of Apteronotus albifrons (Linnaeus, 1766), emitting wave-type Electric Organ Discharges with a frequency of about 800 Hz. In this video the EODs were recorded with two stainless steel rod electrodes at the left of the tank, and made audible via a speaker. Apteronotus swims as easily backward as forward. The electric sense mediates the location of objects and walls. As most electroreceptive fish they rely greatly on the electric sense in the turbid waters they live in (recording by Dr. Tim van Wessel).

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- Two specimens of Apteronotus albifrons (Linnaeus, 1766), emitting wave-type Electric Organ Discharges with a frequency of about 800 Hz, and showing the Jamming Avoidance Response and chirping.  
When a second specimen is introduced, the EODs interfere. In order to avoid unwanted interference both fish shift their discharge frequencies in opposite directions. This behavior is called the 'Jamming Avoidance Response' (JAR).
Agonistic interactions are accompanied by 'chirps', sudden changes in the otherwise regular discharges (recording by Dr. Tim van Wessel).

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Dummy