SAN JOSÉ | October 17, 2026. Researchers in Costa Rica have moved approximately 2,700 corals into deeper water near Isla Tortuga as unusually warm Pacific conditions raise the threat of bleaching.
What the figures and reports show
Scientists with the State Distance University, UNED, relocated coral nursery structures from around five metres to 13 metres below the surface. The university says cooler deeper water may reduce heat stress, while monitoring of temperatures, salinity and coral health has intensified. The initiative is part of a marine restoration project in the Gulf of Nicoya.
Why this matters
Coral bleaching occurs when stressed corals lose the algae that provide much of their energy. Bleaching does not always mean death, and some corals recover if temperatures fall. Reef damage can affect fish habitat, coastal ecosystems and livelihoods linked to fishing and tourism. The relocation is a protective intervention, not proof that all transplanted corals will survive.
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