http://en.wikipedia.org/wiki/Creek_chub
I think that in the spirit of inclusiveness that fallfish (Fallfish Unlimited is a non-starter), stoneroller minnows, and horneyheads should be allowed to count too. But I'm can't make an official policy statement without approval from HNT.
I do think that we should exclude sunfish from membership eligibility, and of course, brook trout are right out... (Mind you that catching a creek chub in a stream full of stunted brookies is a feat worthy of bragging.)
Ed