Subject: Does a tank of water weigh more if there are fish in it

Note to the zoology moderator from the physics moderator:  I thought the person 
might be interested in the mechanisms that fish use to maintain neutral 
buoyancy.  From the physics angle, the answer will be rather dull (neutrally 
buoyant fish displace exactly their own weight of water, and hence make no 
difference...presuming that the water level in the tank is kept constant with 
or without the fish present).



Just curious.

Re: Does a tank of water weigh more if there are fish in it