How can freshwater fish survive in ice covered lakes in the Northern US?

Question

How can freshwater fish survive in ice covered lakes in the Northern US?

Answer 1

There may be a person with a better answer, but water in lakes is never 100% frozen, only a top layer of the water is frozen. So fish can still happily survive w/o being popsicles for the entire winter.

Answer 2

fish are cold blooded. they'll adapt. not all fish though. and the ice doesn't do anything but prevent them from jumping out of the water when a bigger fish is chasing them. but yeah, there fish, cold blooded.