This involves grinding fish, sounds odd I am sure, but this is a way to use fish with a lot of Y bones, fish that may otherwise be discarded. As long as the fish is filleted with skin off, there is no need to remove Y bones, just run through the medium grind plate on your grinder two times. I would NEVER recommend doing this Pangasius or Barramundi, but this does sound reasonable for Tilapia, Featherbacks (maybe), and some ocean fish.
Adapted from an internet recipe.