Employees remove heads from shrimp at the Baton Rouge Shrimp Co. facility in Louisiana last year. As recently as two decades ago, shrimp supplies were limited enough to be considered a gourmet food; the market changed as aqua-farming technologies improved. Illustrates SHRIMP (category f) by Lydia Mulvany © 2014, Bloomberg News. Moved Tuesday, September 8, 2015. (MUST CREDIT: Bloomberg News photo by Ty Wright).