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To Make a Pound of Bluefin Tuna

"To make a pound of ten-year-old Atlantic bluefin tuna, a magnificent high-energy open-ocean predator that may consume as much as 25% of its body weight in food a day, it takes thousands of pounds of fish that in turn have eaten tens of thousands of pounds of smaller fish that in turn have eaten hundreds of thousands of pounds of small crustaceans who in turn have derived their energy from millions of minuscule plants that have translated the sun's energy through photosynthesis into simple sugar - the ultimate food for most of life on Earth." (Excerpt from the book, Sea Change: A Message of the Oceans, by Sylvia A. Earle, published by Fawcett Columbine, 1995, pg. 175)

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