How many types of salmon are there?
Pacific salmon is a generic term used to describe those members of the genus Oncorhynchus that die after spawning. At present, there are seven species commonly referred to as Pacific salmon. There are five species that occur on both sides of the Pacific Ocean:
Chinook salmon a.k.a. king salmon,
chum salmon a.k.a. dog salmon,
coho salmon a.k.a. silver salmon,
pink salmon a.k.a. humpback salmon, and sockeye salmon (Oncorhynchus nerka) a.k.a. red salmon.
Two species occur only in Asia: masu salmon (Oncorhynchus masou) a.k.a. yamame, and amago salmon (Oncorhynchus rhodurus) a.k.a. biwamasu.
source: NOAA – Fisheries Service