I have a small backyard pond with 6-7 various fish. I was doing some cleaning and noticed what looked like a stick on the bottom. I pulled it out and discovered what looks like an eel. It was partially eaten at the "head". This pond has been there for 20 years or more and never have I seen anything like this. How could this possibly find it's way into my pond ?? We have a creek about half a mile north. Any thoughts ??