That's it. My catfish is getting fired. It must have been a traumatic experience for it because it spits out the worms even when it gets them in it's mouth. I am going to release it and catch another one.
The main reason I got the aquarium was to learn something about the native fish, and it is definitely serving it's purpose. If this catfish will not touch worms after so long, even when marginally hungry, I believe that says something about the ones that got away. They will be VERY difficult to catch with the same bait, if at all.