Certain tiny marine organisms, including some dinoflagellates, can produce light through chemical reactions. When water is disturbed by waves or movement, that light can appear as blue-green sparkles.
Bright displays depend on the species, local conditions and timing; they are never guaranteed. Some blooms can be harmful, so always follow local swimming and water-quality guidance.
Even photographs of bioluminescent water can be misleading because cameras often use long exposures. Seeing a genuine display is about being in the right place at the right time.
Quick curiosities
- The glow comes from living organisms.
- Water movement can trigger flashes.
- Not every bloom is safe to enter.
Keep wondering
- What causes bioluminescence?
- Do any animals glow on land?
- Where can I see naturally glowing water?