Sharks can communicate with clicking sounds, researchers discover

In New Zealand, research conducted by a team led by Carolin Nieder from the University of Auckland revealed a groundbreaking discovery about the rig shark, a species native to the region. In 2021, Nieder, who primarily focused on how sharks perceive sounds, unintentionally stumbled upon this silent predator actively producing noises while being observed in tanks with underwater recording equipment. The clicking sound made by the rig shark, which resembles a spark of electricity, has never before been documented in any shark species, thus illuminating a previously unknown aspect of marine biology. The research findings, which were published in the journal Royal Society Open Science on March 26, 2025, elucidate how the rig shark produces these sounds despite lacking the anatomical structures that typically assist in sound production among many fish species. Unlike others, sharks do not possess swim bladders, which are often instrumental in sound generation. The absence of these structures adds a layer of intrigue to the research, potentially indicating that sharks have alternate methods of communication that remain undiscovered. Nieder shared that during her observations, the researchers noted the rig sharks displayed silence while swimming, suggesting that the clicking noise could be a stress response rather than a regular form of communication. This insight marks a significant advancement in understanding the behavioral patterns and acoustic communication of sharks, creatures often misunderstood as mere predators of the ocean. By bringing attention to the sounds sharks make, Nieder hopes to spark curiosity in the public and encourage people to consider the complexities of these marine animals. This study not only redefines the perception of sharks but also adds new avenues for future research in marine bioacoustics and behavioral studies. The implications of this discovery could enrich how marine biologists study shark interactions within their environments, thereby broadening knowledge about their ecology and behaviors."