What does this fish weigh?

[chrism]

Just had last Oct. pictures developed - and I have a question -
I finally caught my big lady, but I didn't have a scale. Length was 31.5" and girth measured from mid dorsal was 26"
I'm out to lunch when guessing weight...Any takers?

[JW]

13 LBS (+or- 1\2 lb)

[IZE]

Generally the formula for walleyes is:

(length x length x length) / 2700

Hope this helps.