Bad news: 15 minutes of thrumming from a diesel engine makes squid hard of hearing. Good news: the cephalopods can recover within hours—if we let them.
Standing next to the speakers at a loud concert can leave your ears ringing. Some squid, it turns out, are much the same: listening to just 15 minutes of boat noise makes hummingbird bobtail squid temporarily deaf. Even though the animals can regain their hearing within hours, the ever-present din of human noise pollution means squid may never get the chance to recover.
Squid are “super inquisitive,” says Putland, and each has its own personality, so she wasn’t surprised when video footage captured slightly different responses to the noise. Some squid breathed more slowly—a tactic the animals use to hide from predators—suggesting they may have been on alert. But others appeared unbothered. None jetted, inked, or changed colors, the typical signs of cephalopod stress.
After exposure to boat noise, the squid had trouble detecting frequencies between 100 and 1,000 hertz, which span the majority of their hearing range. It took up to two hours for the squid to recover. While squid are not known to communicate through sound, this low-frequency range is where predators like dolphins, whales, and fish vocalize, meaning the squid’s sudden deafness could lead to deadly consequences.
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