That is a nice looking fish. Best identifying characteristic of a Chinook is teeth set in black gums. This fish has white gums. Chinook also have heavily spotted tail fins and I don't see that. This must be Coho unless the Alantic - Salmo Salar have white gums. Does anyone know what color their gums are? The Atlantic salmon have escaped from offshore fish farms and are a threat to the native Pacific salmon populations. It could be Alantic but I think Coho. No way Chinook.