A lot of Times channel catfish are mistaken for blues, in this Case i think it has happened once again. But then again forgive me if i may be wrong!!
I'm Not that big of a catfish angler but Know a lot about a lot of species And From what i remember a Channels anal fin is more round through out and the Blues looks like you took scissors and cut, Blues have a straight cut in between the "V" And Channels are not as straight more rounded out. so From What i can see in the Pictures I'll Say beautiful channels although i do see blues. A lot of times Channel catfish will Have a somewhat blueish gray appearance same as the "Blue Catfish" And the most distinctive way to tell them apart is their tail. But again Forgive me if I'm Wrong, I'll Google it And See If I'm Even Right, Pretty sure i am though i forget little.
Beautiful Stringer!