Stanford Study Finds Bleached Corals Recover Within Weeks After Touching Healthy Clones

Research findings published on October 14 in Science Advances indicate that direct contact with genetically identical, healthy coral can reverse bleaching within four weeks. Danny Collins, the lead author from Stanford University, observed a swift restoration of color in bleached coral fragments when they were in contact with healthy specimens. This study originated in 2025 when co-author Steve Palumbi witnessed a healthy coral touching a bleached fragment, which subsequently regained its color. The team examined ten pairs of fragments, discovering that all bleached corals in contact with healthy clones recovered within seven weeks, while those that did not touch showed poor outcomes. Microscopy revealed tissue channels that facilitated the transfer of beneficial algae. Experts cautioned against the feasibility of mass cloning and stressed the importance of reducing greenhouse gas emissions for coral health, as reefs are vital for a quarter of marine life.