I agree with Bruce. In a new pond you get big growth rates. An early spawn BG (2in. in May) stocked into a new pond may well spawn in Sept at 4 in. They are trying to fill the carrying capacity with there kind (a species survival method). RES have a growth rate like a BG so the same is likely. IMO those pics are of early spawn RES this year or late spawn last year , but are not the original stocked RES.