Researchers from the Kent and Bartholomew labs (Microbiology), as well as the Schreck lab (Fish and Wildlife) discovered that Nanophyetus infection reduced both growth and swimming ability in coho salmon.  Nanophyetus salmincola is a common trematode parasite of fish in Oregon.  It is known as the "salmon poisoning fluke" because it can carry the bacterium Neorickettsia helminthoeca, which can be fatal for dogs that eat uncooked infected fish.  Nanophyetus has a complex life cycle that involves a snail, fish, and mammal hosts.  In fish tissues it forms cysts, which appear as small black spots.  High infection intensity can also increase susceptibility to bacterial infections in juvenile Chinook salmon.

Roon, S., Alexander, J., Jacobson, K. and Bartholomew, J.  2015.  Effect of Nanophyetus salmincola and bacterial co-infection on mortality of juvenile chinook salmon.   J. of Aquatic Animal Health, 27:209-216.