It is very likely that they are just overpopulated, which crappie in smaller impoundments are prone to do. Take out as many as you can ... keep every crappie you catch every time you go. Doubtful you can make a real dent, but it can be fun and tasty trying to make that dent
"We're all very different people. We're not Watusi, we're not Spartans, we're Americans. With a capital "A", huh? And you know what that means? Do you? That means that our forefathers were kicked out of every decent country in the world."
John Winger