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VIDEO: Marine Biologist on Tuna Preservation

The population of bluefin tuna near Japan is threatened due to overfishing. Marine biologist Shana Miller joins "CBS This Morning Saturday" to discuss how the world is working to save the fish.

The population of bluefin tuna near Japan is threatened due to overfishing. Marine biologist Shana Miller joins "CBS This Morning Saturday" to discuss how the world is working to save the fish.

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