I agree with what Butch said, all of them will spawn in the same places. You didn't say what lake you are fishing, some lakes just doesn't have many white crappie and if they do the white crappie seem to use one part of the lake.
If you are fishing a big body lake the places you need to look for spawning fish is, shallow coves on the main body of the lake, large flats in depths of 15' or less, shallow points, the back ends of coves with stumps fields or woody cover and shallow flats and also look in small stream inlets. These may wide or may not be wide but crappie will spawn in them.
Some of these places you may not be able to longline them so having a short rod to be able throw some jigs may save your day.
All the lakes seems to be producing right now, good luck.
PROUD MEMBER OF TEAM GEEZER ---------
Ascend 133X 13' - MotorGuide Xi3 & Mercury 4