Think about structure for pike-perches living deep in difficult water

Deep water is a relative term, as it can vary from system to system. Depth may be as little as 15 feet in one lake, but over 30 feet in another.
Regardless, walleyes refer to deep water during the ice fishing season. More specifically, they refer to deep structure or deep water adjacent to structure. These are the primary keys to consistently pulling walleyes from the depths in the winter.