About a year ago, I put probably three dozen creek chub I caught in a pool of a dried-up stream on my property into my pond when it only had about 18" of water in it. Longest fish was probably 3" with most in the 2" range.

Now the pond is full (~12ft) and I netted a chub I saw along the pea gravel beach on Saturday - it was probably 7 inches long and judging by its girth appears to have an affinity for Optimal (my son thought it was a LMB at first).

I have zero expectation they'll reproduce in the pond, but don't figure they are hurting anything.