This has been my experience. I know the beavers are there but as long as there not around at the particular time I'm fishing, I usually do ok. If I see a beaver swimming by every 15 minutes, the fishing is usually slow. A couple days ago I was fishing a Hula Popper and had a beaver swim into my line. It kept swimming, pulled the popper into the side of its neck, and then I got to fight a beaver for 3 or 4 minutes. Luckily it got itself unhooked. I didn't want to lose my popper but if it hadn't come off soon, I would have cut the line.