Know your fish people!!
Look at the small scales and large spots on the tail.
Assuming we are talking about the one with it's mouth wide open (1 up from bottom).
That is a PINK salmon.
Order from top is pink, probably coho (would have to see mouth/gums), pink, pink.
It amazes me the amount of "smart" people who fish, who memorise all sorts of random crap, but can not take an hour or so to do some fish identification research and memorise the identity of 4 or 5 salmon they are likely to catch.
Should be such a test to get your salmon tag.
Couldn't tell you how many times I've been fishing on the river and had someone with a fish flapping on the shore flag me down to help them tell what kind of fish it is. "Coho?!" No, that is a chum. "Spring on!!" No you cast across my line and hooked into my gear.
Really think getting a fishing license should be more like getting your CORE to hunt. I've never heard of a hunter shooting a duck thinking it was a grouse. Short of being a kid and maybe not expecting to catch anything on your walmart spinning set up, if you are an adult and have no idea what species this chrome slimey salmon thing is on the end of your hook you should stay off the water until you get your learn on.