John:

We use the old fashion microfiche reader, but to speed the process and
reduce an error step, we have attached a Sonic GP9 2D digitizer to the
top of this set-up.  The data is digitized into the DisBcal program to
calculate mean length at capture, incremental growth, and back
calculated lengths.

If this is of interest, I can send additional details, etc.

Sincerely,
Steve Fischer
Fisheries Research Biologist
Missouri Dept of Conservation
Columbia, MO