Electric ells are well known, and they can stun their prey with a powerful shock. Other fish can also produce electricity to kill their prey or to defend themselves. They include electric rays, which are common in many warm seas and also electric catfish living in African rivers. fish called mormyrids, which live in very muddy waters in Africa, use electrical fields as a form of radar. This allows them to move about safely and to find food. They can also communicate by means of these electrical signals.
Sharks do not produce electricity, but they possess organs in their skin that can detect tiny electrical currents produced by the muscular movements of other fish. In this way they can hunt without being able to see their prey.
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