Thats an odity! I bet he/she was an aggresive biter. In summer fish I've found quite an array of things from bugs to corkies to cigarette butts. I have caught very few winter fish with stuff in their tummies. I catch the ocassional winter fish with eggs or shrimp in its belly. I did however catch a winter fish on a SW river about 2 weeks ago that was absolutly chrome brite with lice and had 3 big whole herring in its stomach. I couldn't believe it.