Found this info from a 2003 thread in which Bill Cody did some interesting research that I wanted to add to this thread... (Thank you BC for all the work you do)

1. Bob, in talking about the 35 acre lake near Lubbock, led me to think that since the lake had thousands of 4" -6" crappie, these sizes would fit into an 8" HSB's mouth. He said, "We calculated the average crappie in this lake would fit into an 8" HSB's mouth..... I assumed he was referring to the thousands of crappie sampled that were 4" - 6" long. Maybe not.

2. Anyway, FYI, I did some fishery science this week and came up with the following info.
8.25" HSB has a mouth opening of 23mm (0.9").
9" HSB has a mouth opening of 25mm (1.0").
13" HSB has a mouth opening of abt 29mm (1.14")
22 " HSB has a mouth opening of 43-46mm (1.7-1.8").

The vertical height(body depth or maximum body depth)of blk crappie in OH is:
4" long crappie is 31mm (1.2")high/wide
6" long crappie is 49mm (1.9")high wide

And here's a link to the full discussion..

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=45793&page=5


Just a Pond Boss 'sponge'