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RE: wingless fruit files

I grow them.  There are actually several mutants of Drosophila melangogaster
that can't fly.  I prefer apterous because it is truly without any hint of a
wing.  Some fish love them, some don't.  If you have floating plants, the
files often manage to keep out of reach of the fish and eventually make it
out of the tank, but for me that's a minor problem.