no, 16" isn't average, but since it can happen I prefer to prepare for it. After ending up with a 15" oscar in a 90 after just 3 years and no way to go any bigger tankwise, I choose to err on the side of being able to keep the fish.
as far as northern bluegill being smaller, I think you may not be taking into account that indoor aquarium bluegill won't ever experience a northern winter. I was expecting a slowdown in winter that I never got. they were almost as voracious and active at 62 degrees as they were at 78. the biggest slowed down it's growth some, but the smaller ones just used that time to catch up.
granted, this is my first run with natives, but I will be very surprised if I don't end up with 14"-16" fish. I got them at under 1" in april of 2011 and the largest is about 9". the smallest about 6" and the two mid-sized are 8".
the longears still rule the tank though.
as far as northern bluegill being smaller, I think you may not be taking into account that indoor aquarium bluegill won't ever experience a northern winter. I was expecting a slowdown in winter that I never got. they were almost as voracious and active at 62 degrees as they were at 78. the biggest slowed down it's growth some, but the smaller ones just used that time to catch up.
granted, this is my first run with natives, but I will be very surprised if I don't end up with 14"-16" fish. I got them at under 1" in april of 2011 and the largest is about 9". the smallest about 6" and the two mid-sized are 8".
the longears still rule the tank though.