A shark 'superhighway' is being protected by fishermen

For sharks, turtles and rays in the Caribbean, the Mesoamerican Reef -- which spans more than 600 miles from Mexico to Honduras -- is a busy highway. As the second-largest barrier reef in the world, marine species use it to navigate north and south, and its rich tapestry of coral, seagrass and mangrove forests provide vital food and habitat.

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