What are the walleye eating?

[Prkr314]

So the last 2 days we've been leaving Marzurik's before 6am, fishing a couple miles NE of Kelly's and have been marking tons of walleye mixed in with some sort of hatch. With a steady screen of 6-8 walleye on the Lowrance all morning I would have thought the bite would have been a little faster than 12 keepers, no shorts, and almost no junk fish in 3 hours. It took a few passes yesterday to figure out that bandits were getting bit better than spoons and 130 back with 2 oz wasn't deep enough for the bandits, 150/2oz was the number and 2.6 or faster was better. Color didn't matter. This morning knowing the program we got done much quicker.....so back to the post....while cleaning our fish this morning, talking about how many fish we've been marking,how slow the bite has been, how gold the walleye look, what are they eating? all their stomachs had some sort of shell residue in them....what are they eating?