I've had Blues alive but VERY sluggish in 48°F water. I've had other tilapia that were sold as blues die at 58¯F water temp. I no longer use that supplier.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).