Read an article about this a couple of years ago.
Seemed like it was being "loved to death."

Over fishing, heavy tourist use, and run-off from increased population in the islands was cited. It seems to me that the more remote reefs are in much better shape. There are some pretty remote reefs on the SVI, and they were vibrant as compared to many of the BVI reefs that we visit. "The Wall" at Carlos Rosario Bay on Culebra was very healthy looking. So was Horseshoe Reef off Cayo Luis Pena.