I talked to my trapper tonight. He caught one in the river draining my lake. Every year they notch the beaver dam when the lake is iced causing the lake level to go down. This creates a space at the shore where they can surface but still be under the ice. I will make sure next year that I am more vigilant with the trapping and if the otter lowers the level of the lake I will sand bag it back up. I will not make it easy for them. How much damage would a .22 rim fire do to an otter at 100 yards?