This is a Java implementation of the fish weight estimation algorithm posted to the Flyfish listserver in July of 1994 (see the listserver archives with this pre-formed query...

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Is this accurate? To paraphrase a Star Trek episode of many years ago,
*"Dammit Jim, I'm a computer scientist, not a biologist"*. The
algorithm used is W=(L * (G^2))/R, where:

W = Weight in decimal pounds

L = Length in inches

G = Girth in inches (default is .58 * L)

R = 800 for trout/bass, 900 for pike/musky

For my fellow geeks, here's the source code