"Unveiling the Enigmatic Twilight Chorus of the Deep Sea"
Around twilight off Japan's Minamitorishima Island, fish create a chorus using their gas-filled swim bladders and fins, which can be heard 18,000 feet below the sea. Researchers recorded the soundscape of the abyss for a year and discovered daily fish choruses around sunset, suggesting deep-sea creatures may have circadian rhythms. The sounds could serve as a zeitgeber for deep-sea species, but the impact of potential deep-sea mining noise on these ecosystems requires further study.