What ate that Carp?

Otter? Raccoon? Maniac mutant squirrels? Whatever it was, that was a nice-sized carp. That's my minnow bucket above it for scale. It's intact head is to the left, and to the right you can see it's anal fin and how it's tail curves upward just behind that. The view of the skull is from beneath 'cause it's a little twisted.