Steve, no, there is NO chance Tilapia survived. Unless you got some of my stock of Blue Tilapia, your fish died at 52* or higher. You will rarely see dead tilapia. Terrestrial critters like coon, opossum, fox, skunks and more will clean up any on the edges really fast. I can also almost guarantee that you have a few turtles doing bottom cleanup...turtles often find your pond before fish are even put in.