Stomach contents- eels ?

[fcap60]

I had the opportunity to open-up a decent bass recently and found a decomposed eel, approx. 15" in her belly. While I don't keep many bass, I do take one for the table now and then. Typically I have found Lobster, crabs, and a few fish inside, but this is the first time I found an eel.

Question(s):

1. How many of you have found eels in your bass, and

2. Do you think the eels are natural prey (in the northeast) or leftovers from other fisherman ?