Threats from over-fishing, urban coastal encroachment and rising sea temperatures are destroying sensitive corals and devastating the sea life they support.
Fortuitously , there's a growing dedicated worldwide effort to reversing this decline and to finding new - and sustainable - methods to manage the last of Earth's remaining coral reefs. These are some reef facts for you to think about.
Coral reefs have been around a hundred million years and are the biggest living structures on earth. Australia's Great Barrier Reef is more than two thousand km long and can be seen from outer space. Here's lots more info all about halibut.
Scientists have found as much as three thousand different species living on one reef in Indonesia.
Coral reefs are an amazing medical resource, providing chemical compounds employed in antihistamines, antibiotics and other medicines for illnesses starting from asthma to leukaemia and heart problems. Indeed, more than 50% of all new cancer drug research is focused on sea organisms.
Some deep water corals grow extraordinarily slowly-as tiny as thirty cm in 1,000 years, whilst some shallow water corals may grow up to fifteen cm each year. Off in the distance, Captain Efren spotted surface activity and turned the Guerita towards it.
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