I just tried steaming fish for the first time, and it was fantastic. I used cod - never tried walleye so cannot compare.
My Asian friend told me how and gave me this little stand that you put in the bottom of a large pot and then add water (keep water under level of stand). As the water comes to a boil, season fish with ginger, onion, lemon pepper, etc. based on your personal taste. Once water is boiling place plate of fish on top of stand and cover the pot. Let steam for five minutes per inch thickness. Once it's done, drizzle with any other oils/seasonings you like (e.g. soy sauce and sesame oil) and sprinkle with scallions and/or cilantro.
It was so moist and delicious. I usually oven fry my fish, but this is my new go-to method since I can't have the bread crumbs.