Bill is correct. If I remember right, crappie spawn when the water temp is 10 or 15 degrees colder than when LMB do. I think this early season spawning and the risk from bad weather/temp changes that early is the main reason crappie spawning is so iffy. But in the years when they have a good spawn, the crappie fingerlings have all the other species for forage, and mouths big enough to eat them.