Salmon are migratory fish which are born in freshwater systems, spend most of their lives in saltwater and come back to their birth site to reproduce and die. On Canada’s west coast, a great number of coho and sockeye salmon are not making it back alive to where they were born and were dying while travelling up the Fraser River in British Columbia. Coincidentally, there has been a continual rise in the average summer temperature of that same river. To find out if both phenomenon are related, and ultimately determine the interactions between temperature, heart function, and migration success, the heart function of migrating salmon at different temperatures needs to be studied. With this data in hand, we can work to increase the survival rates of migrating salmon in British Columbia.