While farmed salmon often gets dinged for having sea lice, a common parasite in wild salmon commercially sold in the United States has kept its proverbial head down and, so far, it is low on the industry's list of concerns.

Anisakid nematodes can be found in anywhere from 1 to 10 percent of Pacific wild salmon commercially available for sale, according to Michael Ganzle, a food microbiologist at the University of Alberta in Canada, but there hasn't been enough of a focus research-wise on nematodes to determine whether the parasites have increased in salmon or not over the years.