Shrimp may be America's favorite seafood, but consumers may not always get what they ask for. According to DNA analyses conducted by the environmental advocacy group Oceana, 35 percent of shrimp sold in U.S. grocery stores and restaurants was improperly labeled by species or type, raising questions about food safety and complicating efforts to promote sustainability.

In June 2014, the Obama administration announced it would propose new rules for the seafood industry by the end of the year. And just last Friday, the Food and Drug Administration, which is responsible for oversight of fish, issued a report based on DNA analysis of 700 samples collected from wholesalers and importers in 14 states. The FDA found that an average