Seafood restaurants and markets in Slidell, La., serve locally sourced shrimp almost exclusively, according to a report by the Louisiana Shrimp Task Force and seafood analytics firm SeaD Consulting. A study of the city’s food purveyors tested samples of 24 shrimp dishes at Slidell area restaurants and found 21 were made with “locally sourced, wild-caught American shrimp,” according to the task force, an advisory group to the Louisiana Department of Wildlife and Fisheries. “That means Slidell…