Gulf oil spill: More oyster areas closed
The bulk of the closures were in Terrebonne and Lafourche parishes but included several in Jefferson and Plaquemines, according to the Louisiana Department of Health and Hospitals.
Three zones in St. Bernard's Parish that had been closed earlier were reopened last week.
Last week, the National Oceanic and Atmospheric Administration extended its no-fishing zone to encompass nearly one-fifth of federal waters in the spill area.
The closures already have had a serious impact on the multimillion-dollar seafood industry, and the effects have spread to restaurants nationwide.