Tuna: A Favorite Fish Faces Dangerous Depletion

One of the biggest, fastest and warmest fish in the sea is also one of the most sought after, and one of the most threatened. Can bluefin tuna stocks around the world be saved?

Richard Ellis, author of the book Tuna: A Love Story, explains the history of the tuna and the current commercial market for the fish.

Marine researcher Barbara Block explains "biologging," the use of electronic sensors, implanted or attached to animals, to track and record their movements and behaviors in the wild. Could these electronic tracking methods help preserve the fish?

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