Gladden Spit
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
Gladden Spit works on a lunar timetable. For a window around the full moons of spring, thousands of cubera and dog snappers rise off the promontory at dusk to spawn, and the milky clouds they release call in the biggest fish in the sea. Whale sharks spiral up through the spawn with mouths wide, sometimes surfacing beside the boats. Divers hang as a disciplined mid-water group — no chasing, no flash barrage — while the guides read the water. Some trips hit the jackpot; plenty see spawning snappers and no shark, and sightings have grown patchier over the years. Go for the event, and count the shark as grace.
The moment you come for: Whale sharks feeding on snapper spawn, massed spawning aggregations, wild blue-water atmosphere.
Topography: A promontory of the barrier reef dropping into deep water; dives hang over the blue where snappers mass to spawn.
Current: Open water off the reef elbow; expect drift and swell.
Entry: Runs from Placencia in spring; groups drift mid-water in formation under guide control.
Know before you splash
Hazards: Blue-water disorientation with no visual bottom, dusk timing, and boat traffic at the surface.
Permits & rules: Reserve fee and licensed guides required; boat numbers at the aggregation are capped.
Conservation: The spawning aggregation is the reserve's reason for being; strict encounter rules (distance, numbers, no touching) are enforced by ranger patrols.
Who you'll meet
For photographers
Wide angle: ★★★★☆ · Macro: ★☆☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting