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Porichthys notatus

Porichthys notatus
U.S. Geological Survey Department of the Interior/USGS U.S. Geological Survey/photo by Jane Doe / Public domain · resizedfile
A male plainfin midshipman can keep up a low, steady hum from a nest under a rock. Fast contractions of muscles against the swim bladder produce the sound, which helps attract females. A chorus can sound like an electrical hum that refuses to turn off.
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