In Texas when we catch whites, hybrid or striper, and fry up. We dip them in yellow mustard, shake off most, then the batter, then fry them. You do not taste the mustard. But it does take out a lot of the fishy out. The mustard is just a binder for your batter. kind of like using mustard on ribs or brisket.
Try it you will like it I am sure.
I never, I repeat Never use it on Crappie or Bluegills