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University of Chicago Department of Geophysical Sciences
Magma-Hydrothermal Research at Virginia Tech
Computational Infrastructure for Geodynamics (CIG)
This is where you can download FISHES (higher numbers refer to more recent versions).
fishes-2.1.zip
fishes-1.0.zip
and the user's manual:
FishMan-2.1.pdf
FishMan-1.0.pdf