Question has been discussed, before ... and the general consensus is that you really can't tell one from the other, except during the spawn period. Even then, telling a male & female Black Crappie apart can be difficult. But, for the White Crappie, the female's coloration is pretty much normal (+ her fat belly) ... while the male will have darker black blotches, that cover more area than normal (even to the extent, in some cases, of making them appear almost totally black).
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... cp