Chrome starts with a C. If it has Chrome in its tail, it's a Chinook, Coho or Chum (which...all start with a C)
No Chrome its a Pink or Sockeye. Pink have large oval spots on the tail, sockeye typically do not (if they do theyre round). Scale size can be used, but you have to have a frame of reference. If you haven't seen a ton of scales with positive ID on their owner, they don't help much.
If you want good ID advice (and not trying to test or mess with people), really need pictures including head and tail.