Shocking Discovery: Scientists Uncover the Hidden Sounds of Sharks!

Sharks have always been seen as silent predators lurking in the deep. But recent discoveries show they might be more vocal than we thought. For the first time, researchers recorded sounds made by rig sharks (Mustelus lenticulatus), small sharks found in New Zealand. These sharks emitted clear clicking noises when handled underwater, indicating possible distress or a defensive response, according to a study published in the Royal Society Open Science.

Carolin Nieder, the lead researcher from the Woods Hole Oceanographic Institution, highlighted that these sounds challenge the idea that sharks lack a means of communication. “Sharks have advanced sensory systems; that means sound might play a bigger role than we realized,” she explained. During regular testing at the University of Auckland, ten juvenile rig sharks were observed creating clicks when researchers briefly handled them. Interestingly, the frequency of these sounds dropped over time, suggesting that the sharks may have calmed down.

Most sharks are thought to be quiet because they don’t have swim bladders, which most fish use to create sounds. Investigations into rig sharks using microCT scans revealed no special structures for sound production. However, researchers suspect that the clicking might come from the sharks snapping their uniquely structured teeth. These teeth are aligned in plate-like formations, which could make noise during feeding or stress.

The clicks were loud, reaching volumes above 155 decibels—comparable to a shotgun blast—with single and double-click patterns. Some clicks occurred while the sharks were moving calmly, while others did not. It remains uncertain if the clicks are an intentional form of communication or an unintended side effect of being handled.

Interestingly, rig sharks’ hearing is below 1 kilohertz, which means they likely don’t use these clicks to communicate with each other. However, their natural predators, like New Zealand fur seals, are attuned to higher frequencies and may react to the sharp clicks.

Expert opinions suggest these findings could lead to more discoveries about shark behavior. Adrian Gutteridge, a shark biologist with the IUCN Shark Specialist Group, noted that understanding why sharks click is essential. “Further research is necessary to find out if these sounds serve as a warning or if they are simply reflexive responses,” he said.

Research on animal communication shows that many creatures produce sounds for various reasons, including distress or a warning to others. Similar to rays and skates, which also make noises underwater, rig sharks might have more to share than we think.

Shark communication is an exciting field, and these new insights could pave the way for further exploration. What else might we learn about the ways these creatures interact with their environment? More studies could help uncover the mysteries of shark life and their unique adaptations for survival. For additional reading on marine life communication, check out this study.

Check out this related article: NASA Announces Greg Autry’s Nomination as Chief Financial Officer: What This Means for the Agency