Tilefish and king mackerel are two such fish, and both were sold to consumers who believed they were procuring red snapper and halibut respectively.

FORBES: Think You Ate Tuna Sushi For Lunch? Study Finds Mislabeled Fish Nationwide Problem

Costco last week said it halted sales of five wild-caught fish species that are on Greenpeace's "red list" of overfished species, including Greenland halibut, certain types of grouper, and skates and rays.

WSJ: Guidelines for Eating Sustainable Seafood