Smalma - I've never heard if people targeting the river suckers around here on the fly rod, although I have caught some in the Yak they they can fight sometimes. However, I know lots of people target carp in Eastern Washington and they often call the "Golden Bonefish" since they act the same, feed the same, and fight the same as a Bonefish (yes the trash carp that people ignore are awesome fishters).

I may be wrong but it is the carp that is targeted by flyfishers, not suckers.