Ostracods are minute crustaceans, measuring less than 2 mm, yet they create a display of astonishing beauty. Each month, precisely timed to the lunar cycle, they release pulses of bioluminescent light into the water column to attract a mate. Each species produces its own distinct pattern, forming delicate, pearl-like spirals that drift upward through the dark—an underwater light show unlike any other.
This phenomenon is known to occur in only a handful of locations worldwide, and our pristine house reef offers ideal conditions to experience it firsthand. With virtually no light pollution and calm, shallow waters (less than 10 feet deep), the setting is perfectly suited for observing this rare courtship ritual. The dive’s easy access and depth make it suitable for certified divers of all experience levels.
The timing of each spawning event is exact, guided by the full moon and the brief window between sunset and moonrise. Our marine biologists carefully monitor these cycles and can accurately predict the optimal dates and times for viewing—ensuring guests have the very best chance to witness this natural wonder.
2026 Ostracod Night Dive Dates
- February: Tuesday 3rd
- March: Thursday 5th
- April: Friday 3rd
- May: Sunday 3rd
- June: Tuesday 2nd
- July: Wednesday 1st & Friday 31st
- August: Sunday 30th
- September: Monday 28th
- October: Wednesday 28th
- November: Thursday 26th
- December: Friday 25th
Please note: Advance reservations are essential due to the precise timing and limited availability of this experience. For more information on Anse Chastanet and booking 2026 Ostracod Night Dives, email ansechastanet@ansechastanet.com or call 1-800-223-1108.
