Flounder begin life as larvae themselves, but undergo a dramatic metamorphosis as they approach adulthood. One eye drifts to the other side of a young flounder's head, letting it swim flat with both eyes looking up. Despite their camouflage, though, many flounder are at risk from overfishing, according to the Monterey Bay Aquarium's Seafood Watch. If you're a flounder fan, opt for Pacific rather than Atlantic varieties, specifically avoiding Atlantic dab, sole and hirame.