wayne1,

That looks like a nutria to me. If so, you really need to check your dam for damage as well as get rid of any remaining. They destroyed a dam on one of my ponds and significantly damaged another. You simply can not believe the damage they can do to your pond.

Although the "book" says they do not eat fish, I do not believe the "book". Fish skeletons don't read the book either.

Get rid of the nutria or face significant $ damage.