Yes, the book says 42-44 degrees for preferred temp for kings. Dont get to hung up on what the book says. Kings have to eat, so they will go out of temp to feed. Bait fish do not like being in water that cold. The first 1-2 hours of fishing on a normal day, fish are consistantly caught out of temp. When the lake rolls on this side of the lake, and gets in the 40's the baitfish move to the harbor mouths in search of warm water. The first line I set is my rigger with a temp probe. I set it where I find 54 degrees, and it stays there. I set the rest of my spread deeper after this.