Quillback show up in large numbers on my local warm water creeks each Spring. They blend in nicely with the creek bottom -- until one turns sideways to swallow some food drifting by. Thats when the sun catches their armor, producing a flash of silver and gold. Quillback comprise a large portion of the biomass in many warmwater rivers. The Cedar River is no exception. They'll be in the creek for the next 6 weeks. Then they will return to the big muddy river. I nymph for them or bounce something buggy on the bottom.
Another sign of Spring. Minnows sunning in the shallows. Soon the smallmouth will be up the creek chasing them down.