Fish thought to be gone have been seen spawning in the reserve.
Corals are tiny animals that live in large communities made up of individual polyps that secrete a calcium carbonate substance that hardens and builds up to form the reef structure over time. There are different types of corals, such as brain corals and fan corals, that form different types of structures. The coral polyps live symbiotically with algae that provides them with their food. Disease, temperature extremes and pollution can cause corals to expel the algae, leaving only the white calcium carbonate skeleton behind, an event called coral bleaching. Coral bleaching is a worry with global warming heating up the oceans and carbon dioxide causing the oceans to acidify. Coral reefs are important ecosystems because they support larger communities of fish, mollusks, crustaceans and other sea creatures.
When one kind of coral is under attack from killer seaweed, it sends chemical signals to little fish "bodyguards" that come to its rescue.
Corals may be more resilient than we thought, suggests evidence that reefs once recovered after a 2,500-year collapse.