episode description
It's easy to find them in a can, but the lives of tuna in the open ocean have been a mystery to scientists. But thanks to a tagging program in the United States, scientists are learning that these underwater sprinters travel thousands of miles around the Pacific. Now find out what they’re learning about the lives of sea turtles, sharks and other Pacific predators. Photographer and naturalist John Albers-Mead describes visiting the tide pools near his home as "a treasure hunt that changes by the minute.” See how he captures these sometimes-sunken treasures with his digital camera. There’s a hidden danger in the world’s oceans: mercury. A potent neurotoxin that can cause serious illness, mercury has settled in the mud and made its way up the food chain, endangering wildlife and making many fish unsafe to eat. Find out how experts plan to clean up the world’s oceans.
