Fishes give alarm call by electric signal
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Electric fish communicate by generating an electric field that a second individual receives with its electroreceptors. The fish interperets the message using the signal's frequencies, waveforms, delay, etc.
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Von Frisch showed that when a minnow's skin cells are damaged, as happens during a predator attack, the fish releases a chemical into the water that triggers nearby fish to flee. ... Von Frisch had also investigated how the surrounding fish sense the alarm signal.Feb 24, 2012
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