Growth rates in different waters can be a huge factor in crappie size. Taking a scale from the middle of the body on crappie you’ve cleaned can be pressed between a couple sheets of paper. When its dry one can use a good magnifying glass to count the growth rings to determine the approximate age. Where there’s adequate forage thru all of the different life stages and decent genetics, crappies can grow large in fewer years than, say, one who’s had lots of competition for food and the genetics aren’t just right.
I know of waters where an 11″ crappie is of mythical proportions, while the average fish is around 8″. I also know of waters where a 11″-14″ fish is about the norm while the smaller fish just don’t seem to be around.
I don’t judge anyone who keeps smaller crappies, or smaller sunfish for that matter. I just don’t practice it myself. On waters where those 10″ crappies or 6″ sunfish are being kept because people can’t seem to find any larger, I often wonder if they are aware that they may be stripping the top of the genetic pool for that lake. I am a firm believer that people need to decide what size and how many of each fish they want to keep. Most often I keep just enough for Ma and I to enjoy a meal. Sometimes that equates to three crappies, sometimes it’s 6 crappies. All depends on what’s available.