Bennie, I've seen that list before, I didn't find much that was helpful for me (I called some of them) but I did look in my documents and found this article that I forgot about:
Redear Sunfish Management in Michigan In the article it says:
"Temperature and latitude tolerances reported
by Twomey et al. (1984) were derived largely
from data obtained during the 1950s and 1960s
(or earlier). Those studies indicated that
growing seasons = 180 frost-free days are
optimal for the species. However, fish surveys
have shown that several redear sunfish
populations in Michigan have thrived for the
past 40 years in areas having an average of only
150 to 160 days of frost-free growing season
(Table 1; Figures 1 and 2) (Eichenlaub et al.
1990)."
The Table and Figures show where RES have been successfully raised in MI. I'm going to try the RES at Imlay City FF and hope for the best.