As of today, out of season, returns ~September. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Coral trout (Plectropomus spp.), a group of reef groupers, form predictable spawning aggregations at specific mid-shelf and outer-shelf reefs of the Great Barrier Reef each spring and summer.
Fish concentrate in numbers at discrete reef promontories for a few hours around dusk on lunar-timed nights, creating brief but dense spawning events important for reproduction and fisheries management.
Where to see it
A taste of where to see it. The full map, exact coordinates and the best timing for each spot live in the app.
| Viewing spots |
|---|
| Lizard Island reef sites (Northern Ribbon Reefs) |
| John Brewer Reef (mid-shelf spawning promontories) |
| + 1 more spot, with exact coordinates and timing, in the app → |
This is the short version
This page shows a taste. The app has the full list of where to see this, the exact timing, and live conditions for 1,000+ natural phenomena worldwide, so you know the moment one is genuinely worth the trip.