JustBass posted some pics/vids of catching Crappie right at dusk (& a little beyond) at his local lake in California.
Personally, I don't remember any uptick in the bite at dusk, but that's likely because I seldom fish till then ... and when I am there at dusk to fish, it's most likely a night fishing trip and I'm staking out my spot and setting up at that time, rather than actively fishing.