Well, lots of suggestions and thanks. I would like to clarify though: My pond seems to have a good population of LMB in a complete range of sizes from 24 inches all the way down to under 6 inches. These guys all look very healthy. I release anything over 19 inches, take around 20 each year in the 12-18 range and keep everything under 12. I don't really fish for bass, just crappie and I keep every crappie from a quarter inch to 15. I also have a good population of channel catfish which I estimate to be around 75-100 fish. They do reproduce and I have a few in the 10 lb range on down to 2-3 lbs and smaller. They are very fat in good condition. I take out 10-15 each year. Blue gill are very numerous, but the sizes are small. Every bass and catfish I catch are full of them. This is why I feel I need something to hold down the crappie. I would like to see the overall size of my crappie increase and i realize that this means eliminating numbers.
So, does this information help anyone offering an opinion on introducing a crappie predator? Thanks, I really appreciate the information.