Whale Shark

Photo: Simon Pierce · CC BY-NC

Whale sharks appear at Two Mile Reef between October and February, drawn by seasonal zooplankton blooms and fish spawning aggregations that the Mozambique Channel's upwelling system concentrates along the reef's edge. As the ocean's largest fish, they filter enormous volumes of water — each individual consuming hundreds of kilograms of plankton per day — and their seasonal presence at Bazaruto is a powerful indicator of the ecosystem's productivity. The population visiting Mozambican waters is part of the broader western Indian Ocean aggregation, with photo-ID databases linking individuals seen here to sites in Madagascar and Tanzania.