Patience, young jedi. Keep offering them. And when you chop them up, mix the pieces, then kind of mash them together so plenty of worm slime gets on the fish. Or, try the tilapia. It's got a more mild odor, more easily camoflagued by the worm.

My new babies are all taking pinky parts now, and I had to resort to worm camo to get it done. Now they take them unscented.