This year has brought about a second wave of snakeheads with 16 documented catches since the spring, including that of a 6-year-old specimen, which could suggest that the fish have made a permanent home for themselves in the Potomac. If the snakeheads continue to thrive, fisheries biologists worry about the future of largemouth bass, a popular and economically important game fish. "The snakeheads are voracious predators, and they prey on fish that might utilize the same habitat," Albert J. Spells of the U.S. Fish and Wildlife Service told the Times. "We think large-mouth bass and snakeheads may share the same habitat."