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Coral Spawning
Coral spawning is one of the ocean’s most important reproductive events – and it usually happens while everyone’s asleep.
Divers log thousands of dives without ever seeing coral spawning. Not because it is rare, but because it is brief and easy to miss. The timing is precise, the window is short, and unless you are in exactly the right place at exactly the right moment, it’s just a regular coral night dive.
We focus on careful observation and consistent documentation, helping researchers turn scattered sightings into usable records. By spending long nights in the water and recording these events, we contribute small but meaningful pieces to a process that is still not fully understood.
How we monitor
Late night dives
During night observations, we witness spawning events firsthand and record the conditions, times, depths, and coral species that spawn.
Egg traps
We help the researchers place fine mesh over selected corals at the start of the night dive to note whether spawning occurred while our attention was elsewhere.
Coral funnels
Funnels are carefully positioned by the researchers before the expected coral spawning cycle and checked each morning with snorkeling surveys.
What is coral spawning?
Coral spawning is the moment when mature corals sexually reproduce by releasing tiny eggs and sperm into the water. For many coral species, this occurs simultaneously, usually at night and only during certain times of the year. If fertilization is successful, tiny coral larvae form and drift with the currents until they find a suitable place to settle on the reef. There, the larva develops into a coral polyp and slowly begins forming a new coral colony.
Why we monitor coral spawning?
Each observation is logged using clear, repeatable protocols, including time, location, environmental conditions, and the coral groups involved. Over time, these individual nights begin to form patterns. The data collected through this project supports ongoing coral spawning research carried out with The Faculty of Marine Sciences and Fisheries, Luminocean Indonesia, and Ocean Gardener, contributing to wider efforts to understand coral reproduction, support reef restoration, and strengthen long-term reef resilience.
