Your math looks right. I did it as well, but it's fun to have others grade the 'test'.
It's interesting to compare the male BG to Archer's BG from a few weeks ago (I was drooling over that one) They weighed the same 1lb 6 oz, but this one was around 9" vs his that was 10". You can see where this dude is just round.
Bruce will weigh in later I'm sure, I shared these with my bigbluegill.com buddy before I posted. I think he's scheming about something.
