Ghost knifefish, as they are known, put a small current through the water to sense their environment, and undulate a long fin to move around.
Scientists at Northwestern University, US, believe both features could be harnessed in a new class of autonomous underwater vehicles.
They are developing robots that will be able to swim around debris in total darkness, such as inside a sunken ship.
"Today, we don't really have underwater robots that work well in really cluttered conditions or in conditions where vision isn't useful," said Prof Malcolm MacIver.
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