QUESTION:
 
How do the fish live in space.  How do the fish swim with no gravity? Does the 
water rise to the top of the tank if there is any air in the tank? We know
that air needs filtration for the fish to breathe, so what does the water do 
in the tank? Does the water expand at all?  How do you expect the fish to
react?  

ANSWER from Mary Williams on April 15, 1998:

Fish in water don't experience gravity the way we do.  Have you ever
noticed that things are lighter in water? Water counteracts some of the
gravitational pull.  The fish are housed in something called the CEBAS
mini-module.  The container has water all the way to the top. The air that
is supplied to the water does not cause big bubbles so the fish shouldn't
get trapped in an air pocket. The fish don't seem to have any problem
swimming and should do well in space. I think if you look on the Neurolab
page, you might be able to find out more info on the CEBAS mini-module.