Glassy Sweeper

Photo: Margaret Griffis O'Brien · © all rights reserved

Glassy sweepers pack the upper chambers of ocean blue holes in dense, shimmering clouds that pulse and rotate as divers approach. They are nocturnally active planktivores that use the dark cave interiors as daytime refuge from reef predators. Their bioluminescence-tinged schools are a signature visual of Andros blue hole diving, particularly in the late afternoon light.