Males take on a black coloration gills,chest,and belly During the spawn. Dont know for sure but i think it's from guarding nests in shallow water. But i have also caught crappie in a foot of water in summer and don't have the black coloration. Females usually remain same color all year. They they lay and return to deeper water. Don't know how to tell a 10" spawned out male from a female.
I know for a fact that the clearer the water the deeper the spawn. Most that don't know that think the spawns over and they are just fishing to shallow. I have seen nests in 8fow to 10fow on BS arm with males in them, when lakes clear. The best thing i can tell you is is you arnt doing well move out deeper and SLOW DOWN!!! Thats the best rule this time of year slowing down. The fish are everywhere doing everything. You'll find fish spawning shallow, fish staging to spawn, post spawn fish suspended in open water, post spawn fish in pole timber, and fish in brush piles. Just try several depths locations and presentations till you find them.