Heyward Mathews has been scuba diving and spearfishing the Gulf of Mexico for more than 40 years. An oceanographer by trade, Mathews is trained to observe and record changes in the undersea world. Enlarge A lionfish swims in an aquarium at the Nova Southeastern University Oceanographic Center in Dania Beach.AP ARCHIVE / 2013 But Mathews will be the first to tell you it doesn't take a marine biologist to figure...
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