The Atlantic has an article about intact vs. overfished coral reefs.
[L]arge predators both reflect and safeguard the health of coral reefs. If they’re fished out, the rippling consequences can be devastating, leading to fewer fish and sicklier corals. And since those changes happened decades ago, they’ve influenced our perceptions of what coral reefs should look like. We think of the kaleidoscopic realms of Pixar movies or aquarium tanks, but those are reefs that have already been badly depleted. Pristine ones are worlds where predators abound, and colorful prey cower within the coral. “It’s like the difference between the English countryside and the African Serengeti,” […]