THE ANIMAL FILES

electric eel

Electrophorus electricus

The electricity is both a sense and a tool.

Electrophorus electricus is one particular species within the electric-eel genus, not a name for every electric fish. Its electric organs support more than dramatic discharges. Alongside sensing and prey capture, its need to breathe air shows how several systems work together in a freshwater body.[1]

Follow the evidence ↓
electric eel
Image: Steven G. Johnson · Commons · CC BY-SA 3.0
Identity
A knifefish, not a true eel[1]
Electric organs
Specialized cells called electrocytes[1]
Breathing
Regularly takes air at the surface[1]

Cells that add their output

Electrocytes are arranged like batteries in series: the voltage differences of many cells add together. A nerve signal opens ion channels, changing electrical conditions across cell membranes and triggering a discharge. The summed output comes from the arrangement of the cells as well as the response of each one.[1]

More than one electrical task

Lower-intensity electrical signals help sense the surroundings, while stronger discharges can detect or incapacitate prey. Suction then draws captured prey into the mouth.[1]

A fish that returns to air

Gas exchange through vascularized tissue in the mouth makes air breathing important for this species. It rises to the surface before returning below. A fish’s presence underwater does not establish that all its oxygen comes from water. Breathing structures and observable surfacing behavior need to be considered together.[1]

A COMMON MIX-UP

Does the common name make it a true eel?

No. It belongs to the knifefish order, not the order containing true eels.[1]

TRY A LITTLE REASONING

Why would describing every discharge as a shock miss part of its biology?

Reveal the explanation

Electrical signals also gather information. Signal strength and behavioral context help separate sensing from prey incapacitation.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Electrophorus electricus (adapted and translated; exact revision)
  2. NCBI Taxonomy — Electrophorus electricus (identity and game lineage)

Last fact check:

One discovery leads to another

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