Blueback is the name of these early run coho's that can be anywhere from 1lb to 4lb's.They are very tasty little guys.They run for around three weeks.They are called this because of the very blue backs on them.They are beautiful looking fish. Around early June the Cap has a run of summer run cohos that can get anywhere from 4lb to 8 lbs and hey run until september, then the bigger northern coho's start to come in for the fall run.lucky M. said:what is a blueback? is it special? isn't a blueback just a word for coho just like spring is a word for chinook? I know the cap has its wild coho and the little hatchery ones. Isn't that where the segregation ends? ??? I'm confused.