It is certainly true that, in trying to understand the multitude of factors that affect Pacific salmon populations, it is a complex picture, and we know that there are multiple factors that positively influence the returning populations of Pacific salmon. Certainly, that's one reason we conduct the diet composition studies for pinniped populations, but it's also why we invest time and energy into pathogen studies, habitat studies, monitoring the returns throughout the north Pacific climate change study, etc. We have such diverse Pacific salmon research programs to try to understand the multiple factors that affect their survival.
Evidence of meeting #56 for Fisheries and Oceans in the 44th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was population.
A recording is available from Parliament.