I caught them on a black and chrome spinner cranked as slow as I could and still feel the blade turn. He measured 15inches, they definitely seemed to be a little bigger (thicker) than the ones I caught last year. Last year they seemed more cigar shaped.
I don't have any aeration in the pond. Temp is at 68 F on the surface bottom temps seem to hover around 62F. In the hottest part of the summer, usually August around here, the surface temp will climb to the mid 70's. We have had a pretty mild spring so far this year.