Ewest,
Are otters likely to remember the ponds and come back next winter or are their movements mostly random?

The otters didn't come around as far as I know the first winter I had CC, and some of the CC were already three pounds plus.

That first winter the ponds didn't freeze. This past winter we had up to 3/4 inch ice a couple of times for a day or three. The otters would go under the ice when they found a thin spot to break through. At first I thought it was deer breaking the ice.