Nevertheless, Hueter notes his study shows that people should limit the amount of shark meat they eat to no more than once or twice a month.

CNN: Beware of shark meat, FDA warns

The director of Mote Marine Laboratory's Center for Shark Research in Sarasota, Robert Hueter, spent five years studying samples from a variety of shark species caught off the coasts of Florida, including the two most-popular commercially-caught species.

CNN: Beware of shark meat, FDA warns

"What we found for our 124 sharks that we sampled was that about one-third of them came in with mercury levels that were over the Food and Drug Administration's action level of one part per million, " said Hueter.

CNN: Beware of shark meat, FDA warns