Whenever I keep my fish, If there is something in the gut, I cut it open to see what they have been eaten. Last time I found in the same cat a rubber tube bait holder and a rubber worm on a hook. This was a factory made rubber worm that covered the hook and the leader. I think it was picked up from the bottom because the hook was free inside the gut alone with the tube. I do find gills, crawdads, moss, Frogs and other things I cant figure out for the life of me what it is or was..LOL or GROSS. I do believe it gives us a good idea what the cats are feedin on. Anyway, What are some of the things ya find if ya do check it.