Be as stealthy as possible.
Use a casting rod/reel that is your "longest casting distance" outfit.
Tie on a 1/16oz marabou Roadrunner (Chartreuse).
Fish the deepest area, and any shaded areas (during the shaded period of the day.)
Keep some of the smaller ones, release all the larger ones (they'll replenish the numbers, but also help control the numbers by feeding on the fry).
You say "in my area" ... so I'm assuming it's not "your" pond. It probably "needs" some cover added to it, like a downed tree (from the bank out into the "deep" water). See if the state, or owners, would allow you to add some cover (at your own expense/time). You won't need, or want, to add much ... just enough to concentrate them in an area. Too much "security" would allow them to be even more safe from any predation (human, bird, other fish??) and that may serve to allow them to overpopulate the pond.
If they're White Crappie, I'd set my "keeper" limit size to anything less than 10 inches ... If Black Crappie, anything less than 9 inches.
It may not be a perfect plan, but it's what I'd do :D
... cp