Fish populations, including Crappie, can be cyclical. Keeper size fish you are talking about (12in +) are probably at least 3-4 years old. If you think back that many years were there any factors that may have affected the spawn those years? High water, low water, late cold spell, etc; poor spawning conditions can influence year class populations. Hopefully your observations are not a trend, just a lull in the cycle. I do not fish down that way, maybe DrumKing can add his observations. Good luck on finding some of those slabs.
Sent from my iPhone using Crappie.com Fishing mobile app