I fished the pond today, specifically to measure gape. Here's some data points for you.

All gape measurements are horizontal gape.

YP Male 11" 1.2" 3 fish
10" 1.0" 4 fish
9.5" 9.9" - 1.0" 2 fish

YP Female 12" 1.2" 1 fish
11 3/4" 1.2" 1 fish
11" 1.0"-1.1" 9 fish
9.5" .9" 1 fish

SMB 11" 1.5" 1 fish
11" 1.3" 3 fish
10" 1.2" 1 fish





I have some LMB that I caught and tossed in a cage, and I can net 'em and measure them. Most were 7"-8" but one was around 17".

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).