Fishing for walleye question

[Kent]

I plan on trying for walleye more this year (didn't fish for them, at all, last year, so it won't be much of a challenge to fish for them more this year).  I have a question on locating spawning walleye, using side imagining.  Does anyone have any experience in how to recognize spawning walleyes, on side imagining, from carp and other fish?