If something smells fishy the next time you step up to the seafood counter or sit down for sushi, it may not be the catch of the day. An estimated 33 percent of seafood sold in the United States is incorrectly labeled by type of fish, catch method or provenance, according to a recent report by conservation group Oceana. So that ahi tuna roll you ordered might actually be escolar, a cheaper substitute known as the 'ex-lax fish' for its digestive effects, and the wild-caught shrimp at the grocery store could have in fact been farm-raised in Thailand.