This study aimed to document coral spawning on a fringing reef in Guadeloupe (Lesser Antilles). In situ observations were made between 21:30 and 23:00 on days 6, 7 and 8 following the full moon of August 2008. We were unable to observe any sign of reproductive activity 6 days after the full moon. Colonies of the massive star coral Montastrea faveolata were noticed to release bundles of gametes 7 days after the full moon. Multi-species synchronous spawning of corals was observed 8 days after the full moon of August. A total of three species (Montastrea faveolata, Montastrea cavernosa and Diploria strigosa) broadcast spawned. Moreover, the same night, we documented the presence of zygotes near the tips of the tentacles of Eusmilia fastigiata indicating that this species is ready to spawn and the swarming of a large number of polychaetous annelids including syllid polychaetes in the genus Odontosyllis which were observed at the surface water producing brillant displays of green bioluminescence during mating swarms.
