This species hosts several species of parasites, including Haemogregarina stepanovi, monogeneans of genus Polystomoides, vascular trematodes of genus Spirhapalum and many nematode species.
Three parasites (Ceratomyxa shasta, Cryptobia salmositica, and Haemogregarina irkalukpiki) were identified as posing the greatest threat to the fisheries resources of the immediate area and also to the downstream areas.