Some kind of marine salts or kosher salt would be good. Your friend's
aquarium is probably not so good, since I assume there are other fish in it
who would not enjoy being with a stressed bass. The one time I tried this
with a freshwater fish going into salt was with a pumpkinseed sunfish with
some kind of worm on its side. Within 30 minutes the worm fell off, and the
p-seed was back in freshwater and much relieved. I've seen this done several
times in the other direction, putting a saltwater fish into freshwater to
shake parasites. It's usually less of a stress in the short term to put a
fish in water of higher osmotic pressure (saltier) than into lower osmotic
pressure (fresher); a sudden shift into freshwater for an extended time can
cause cellular damage from swelling with water, while shriveled cells from
exposure to saltwater can hang on for a longer time.
--Bruce Stallsmith
Huntsville, AL, US of A
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