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The researchers developed a "stress test" for coral reefs, identifying the ones they think most likely to survive rising sea temperatures. Those reefs--"reefs of hope," they call them--that pass the test should become a priority for conservationists, say the researchers.

Preserving a species of weed-eating fish may be the key to saving the world's coral reefs from being engulfed by weed as human and climate impacts grow. A new study by the Centre of Excellence for Coral Reef Studies (CoECRS) has found that weed-eaters like parrotfish and surgeonfish can keep coral reefs clear of weed up to a point.