Electric organ discharge

An electric organ discharge (EOD) is an electrical signal generated by specialized cells in an animal’s electric organ. It can serve in sensing, communication, or defense.

Electrocyte: An electrically specialized cell that generates voltage through the coordinated movement of ions across its membrane. Electrocytes are the cells whose synchronized activity produces an electric organ discharge.
Electrolocation: The detection of objects through changes they cause in an animal’s self-generated electric field. An electric organ discharge supplies the field that electrolocation monitors for distortions.
Electric fish: A fish that produces or detects electric fields using specialized biological systems. Electric organ discharge is one defining feature of many electric fish.
Jamming avoidance response: A behavioral shift in electric-signal frequency that reduces interference between nearby electric fish. It shows how fish adjust discharge frequency when another fish’s signal overlaps their own.
Action potential: A rapid, temporary reversal of a cell’s membrane voltage caused by ion movement across the membrane. Action potentials activate electrocytes and shape the timing of an electric organ discharge.
Active electroreception: Sensing that uses an animal’s own electric field to detect nearby objects or organisms. The discharge is the emitted signal at the heart of this sensing strategy.
Electroreception: The biological detection of electrical fields by specialized sensory systems. Discharge signals matter both as emitted fields and as stimuli detected by other fish.
Ephaptic coupling: The influence of one cell’s electrical field on another cell without a direct synaptic connection. It may help explain how electric organs coordinate discharges across groups of electrocytes.
Electric organ: An organ made of electrically active cells that produces voltage in certain animals. Its arrangement and activation determine the discharge’s strength and waveform.
Electrocommunication: The exchange of information through electric signals between animals. Fish alter discharge timing or waveform to convey identity and social state.

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