Southern California leads the nation in seafood fraud, according to a study released by an international ocean conservation group.

Oceana’s findings showed 52 percent of seafood sold in grocery stores, restaurants and sushi bars was mislabeled in the Southland, which was 20 percent higher than the national average of 33 percent.

Researchers said the seafood that was often disguised was cheaper or more “readily available,” such as red snapper and tuna...

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