What is the difference between the Atlantic salmon and the Pacific salmon?

The Atlantic Salmon (Salmo salar) is actually one species within the genus Salmo. Pacific salmon are represented by seven different species, see question above, and belong to the genus Oncorhynchus. The seven Pacific salmon species have life histories that are extremely complex and vary widely within and between species. However, all the Pacific salmon die shortly after spawning. Atlantic salmon have a much less variable range of life history strategies across the species and have high post spawning mortality but are capable of surviving and spawning again.