El-Fish

A hint on how to create some really weird mutations
and have fun doing so :
El-Fish stores its fish as roe in binary files.
When you click on Restore, the software converts a
roe file back into a fish.  But you can also convert
almost any binary or ASCII File
(a customer database, a budget spreadsheet, a
health-benefits memo) into a fish.
Just copy the file with new extension .ROE.
(Don’t use EXE or COM Files.)
After loading El-Fish, Click on Restore From and find
the fishy new file.
It will create one or more mutant aquatic life forms. 
I tried a file containing Earned Run Average statistics for
American League pitchers, and as expected, the fish created
was extremely ugly.