Damien Barrett (Grad Student, Bartholomew Lab) is selectively crossing fish from resistant and susceptible stocks to create hybrid offspring.  Some of these fish are resistant, and some are susceptible.  Ceratonova shasta is a myxozoan parasite that causes significant mortality of salmon and trout in the Pacific Northwest.  Resistance to the parasite varies between fish stocks with stocks either being highly resistant or highly susceptible.  Mapping a population in this way will allow the regions of genome responsible for resistance to this important pathogen to be identified.