The actual spawn won't happen 'til the water warms another 10 degrees or more, but as the water creeps upward, crappie will be caught shallower and shallower. They'll be found in shallow water ahead of spawning time, especially shallow water that warms quickly... such as areas with dark bottoms, warm inflows, and rocky areas (especially ones that face south 'cause they get the most direct sun). If I get out this weekend and find surface temps around 43 to 45, I'll be focusing on the 6 to 10ft range adjacent to deeper water, and I'll keep an eye on the temp, 'cause usually in cold water, if you find a place that's a degree or two warmer, you'll find active fish.