The story of cryptobenthics – a category of fish that is literally the fast food of coral reefs. They fulfil this role by having roughly 70% of their population on a typical coral reef eaten every week. In a (very real?) sense, the only reason that these fish are not extinct is that they reproduce, hatch and grow quickly enough to replenish their numbers as fast as they are being eaten.
P.S. They “break” the fundamental rule that vertebrate spend most of their life as an adult. Cryptobenthics barely make it to adulthood before they are eaten.