A top sourcing executive at McDonald's told an audience of Alaska's pollock industry leaders that the fast-food chain is seeing a rise in issues in the raw material used for its Filet-O-Fish, with the nematode parasite highlighted as one of the biggest concerns.

McDonald's, which uses deepskin pollock for its iconic square patties, called on the industry to put increased focus on product quality.

"We’re seeing more challenges with nematodes, bones and other foreign objects than we’ve seen in a long time," Jason Cervone, McDonalds' director of sourcing for global fish told Genuine Alaska Pollock Producers (GAPP) members at their annual meeting in Seattle Monday.