Tilapia fish gather at a viewing window in their holding tank at the U.S. Food and Drug Administration's (FDA) Center for Veterinary Medicine labs in Laurel, Maryland, November 5, 2009. Reuters Pictures logo Reuters Pictures 27 months ago

Tilapia fish gather at a viewing window in their holding tank at the U.S. Food and Drug Administration's (FDA) Center for Veterinary Medicine labs in Laurel, Maryland, November 5, 2009.