ODFW's Kris Homel, in collaboration with Dr. Jerri Bartholomew (OSU Microbiology) is studying endangered chum salmon and one of the potential sources for mortality, the parasite Ceratonova shasta which has been shown to be present in the Columbia River Basin.  Chum salmon, Oncorhynchus keta, populations in the Columbia River Basin were listed as threatened in 1999 under the Endangered Species Act.  Despite recovery efforts, fry-to-adult survival rates remain depressed and are consistently lower than in other regions.  Lab and in-river sentinel exposures of two stocks of chum salmon (Big Creek, Oregon and Washougal, Washington) show low to moderate doses of C. shasta confirming the previously unknown susceptibility of this salmon to the parasite.
    

https://www.dfw.state.or.us/fish/CRP/docs/lower-columbia/Lower_columbia_...