FYI for J.Calvin and maybe a few others. Water is heaviest at 39.2F (4C). Water gets lighter as it gets colder and warmer than 39F. On cold nights water next to the surface gets colder than 39F and tends to stay on top until it freezes. Thus pond or lake water a few feet below the ice is 39F all the way to the pond bottom. Rarely does the deep water get colder than 39F. Although there are some exceptions to this rule.
Back to tilapia. All tilapia depending on the species or subspecies will die when water gets below 50 to 45F. No species of tilapia are known to survive very long in water below 44-45F.
Last edited by Bill Cody; 01/09/13 08:15 PM.
