My favorite culling bait is a 3" "senko-type" bait in green/white - fished on UL rod with no weight and a 1/0 or 2/0 hook.
Roostertails work well but my pond has too many snags to keep it from being hung on sticks, stumps, and logs all the time.
At the right time of the year/day, a tiny torpedo works well and is by far the most fun because I love those "blow-ups" on top-water baits!
Also, those li'l chatterbaits that others are talking about are great too. I've lost all mine but I plan to get some more.
