Jellies live in virtually every part of the ocean and come in a dizzying array of shapes, sizes, and colors. Some, like the aquarium's box jellies, are no bigger than a thimble.

Displaying a great white has long been a dream of aquariums around the world. But previous efforts to care for the sharks have largely ended in failure.

For more than 20 years, the Monterey Bay Aquarium has entertained, educated, and fascinated its nearly 2 million annual visitors with pioneering displays of realistic undersea environments.

With nearly three quarters of the world's fish and seafood stocks now fully exploited or overfished, it's increasingly important for consumers to understand how their seafood dinner can contribute to the health -- or degradation -- of the ocean.