"There is still lots of fishing pressure on Pickle's Reef, " Akins said.

CNN: Counting fish adds up for marine protection

But destructive fishing pressure has sharply depleted ocean wildlife, some by 90 percent in 50 years, including sharks, tunas, marlin, menhaden, groupers, snappers, tarpon, turtles, shrimp, crabs and others.

CNN: An SOS on World Oceans Day: Save our seas, save ourselves