While pouring thru pictures on the web, I can see similarities between both a shad and a shiner.
Assuming that in a best case scenario, these are golden shiners that I put in the pond in september and they were on average around 4" long, I fed aquamax into the end of october, and have aeration and a clean pond with plenty of food for them. Is it possible that these things have hit a 7-9" size by now? Would this scenario be a mutant growth for a golden shiner?