Scientists Move Elkhorn Coral to Land Hatchery Amid Bleaching Fears
Quick Look
Scientists transported 30 pieces of endangered elkhorn coral from Florida nurseries to a land hatchery, fearing mass bleaching due to warming waters could wipe out remaining populations, which are already functionally extinct in some areas.
AI-generated summary
Why It Matters
Elkhorn coral populations were decimated by heat waves in 2023 and 2024, leading to functional extinction in parts of Florida, with scientists fearing 2026 could be even worse.
KEY BISCAYNE, Fla. -- Scientists working to save a coral species from extinction transported 30 pieces from nurseries off the Florida coast to a hatchery on land Wednesday, fearing that warming waters could trigger a mass bleaching event this summer that could wipe them out.
Elkhorn coral populations were decimated by a 2023 heat wave and a less severe one in 2024 that left them functionally extinct — meaning remaining colonies are too small and far apart to reproduce in the wild — from Broward County to the Florida Keys, said Diego Lirman, associate professor of marine biology at the University of Miami. Heat causes coral to bleach, which can be fatal if it lasts long enough.
Researchers have been propagating them at coastal nurseries, but decided to bring some ashore now because of indications that 2026 will be “a really bad year” for bleaching — perhaps even worse than 2023, Lirman said. Coral has been showing indications of heat stress as water temperatures rise.
Coral populations are living creatures that form reefs, globally important for seafood production, protecting coastlines from storm surges and tourism. But scientists fear they could be lost because of climate change: Florida coral has experienced four mass bleaching events in the past decade.
“They seem to be blending into each other and corals are not getting time to recover,” Lirman said.
Divers focused Wednesday on collecting genetically diverse coral pieces, wrapping each in wet bubble wrap and placing them in coolers before sanitizing them and putting them in tanks at the hatchery.
The university exchanges coral with other researchers and facilities to preserve as much original genetic diversity as possible in nurseries and in hatcheries, “so if one goes down you don’t lose the last remaining genetic information,” Lirman said.
“You never know: You may have some that are resistant to disease, some that are resistant to temperature, some that are resistant to acidification,” he said. “Once we lose them, then that information is lost.”
What to Watch
AI outlook — possibilities, not facts
2026 will be a 'really bad year' for coral bleaching.
Likely · Within years
Open Questions
- Will the transported coral survive in the hatchery?
- What specific measures will be taken to protect coral in 2026?
- How will genetic diversity be maintained long-term?
