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flag Billions of Great Barrier Reef corals spawned in late November 2025, triggering a massive reproductive event to aid restoration amid climate threats.

flag The Great Barrier Reef’s annual coral spawning, a synchronized reproductive event occurring in late November to early December 2025, saw billions of corals release eggs and sperm in response to lunar cycles, sunset timing, and ocean temperatures. flag Divers witnessed dense clouds of pinkish gametes, likened to an underwater snowstorm, though the release produced a foul odor from decaying sperm. flag Scientists collected gametes to boost fertilization success from one in a million to one in ten thousand, using floating pools and nutritional supplements like Omega-3 oils to enhance larval survival and heat resistance. flag Efforts focus on breeding resilient corals from bleaching survivors to support reef restoration amid ongoing climate threats.

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