I could be wrong on this but when reading Jim Steadke thread,he said the females come on to the reefs at night to spawn and then head out to the deeper water adjacent to the reefs during the day.Think the full moon is a cue for the fish to spawn based on best time to lay eggs.The deer doe supposedly use the moon too to go into heat.Both trolling and jigging is effected by water clarity.When water colder fish are more lathergic and will not chase at higher speeds drifting or trolling.The guys jig spoons initially in the real cold water and in very dirty water.The hair jig bite seams to heat up later when warms a little and needs a little cleaner water.The hair jig bite seams to catch mainly male fish in shallow water on the reefs or the beaches.You can catch walleye all year long trolling crankbaits.You are not going to catch much trolling spoons or harnesses below 50degrees though.Not exactly sure,but the walleye have been this way for a long time now.Sorry for writing in one long paragraph but doing on my phone and can't do it any other way.