Maybe we are eating different fish. Stocked trout is pretty bland and somewhat mushy. I've never had truly wild trout, so maybe they are better. The bluegills here taste a lot better than farmed tilapia (do they even sell wild?) - mild, a little sweet, and flakes well. I agree bluegills are better than catfish, but depending on the catfish I prefer them over tilapia.

I hear that water quality and, to a lesser extent, water chemistry has a huge impact on taste. I've sort of noticed that in certain lakes compared to others.