Unravelling the chemistry behind the sea’s bioluminescent sparkle

Bioluminescent dinoflagellates create some of the ocean’s most spectacular night-time displays, yet the chemistry behind their glowing blue–green flashes is still surprisingly elusive. Researchers are now uncovering how mechanical forces trigger rapid reactions inside specialised organelles, why these organisms evolved such unusual light-making machinery, and why the underlying chemistry may be unlike any other bioluminescent system. Their findings not only shed light on a longstanding biological mystery but could also inspire new technologies—provided fragile ecosystems like Puerto Rico’s Mosquito Bay, home to the brightest sea sparkle on Earth, can be protected.