This article offers a stark assessment of coral reef status:

The Great Barrier Reef has lost half its corals within 3 decades

The Great Barrier Reef, the world’s largest coral reef, covers nearly 133,000 square miles and is home to more than 1,500 species of fish, 411 species of hard corals and dozens of other species.”We found the number of small, medium and large corals on the Great Barrier Reef has declined by more than 50% since the 1990s,” reported co-author Terry Hughes, a distinguished professor at the ARC Centre of Excellence for Coral Reef Studies, in a statement.

Here is another article about the fish that inhabit reefs:

Ocean warming halves coral reef fish communities

Higher water temperatures linked to climate change slashed a Pacific Ocean coral reef fish community by half, according to a new study led by University of Victoria biologists that is one of the first studies to assess the direct impact of heat stress on reef fish.   

Between ocean acidification and global warming, coral reefs are doomed unless humans take drastic action to reduce the amount of carbon dioxide in the atmosphere.

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