An aquarist is someone who collects fish in aquariums. They can also simply be called fish keepers. Some collect a variety of fish, while others specialize in a few kinds.
A catapultist.
onithbfdbvb
a fisherman whatelse could it be?? An Aquarist is a person who has aquariums and collects fish as a hobby, a simpler term could be fishkeeper.
I would call him a hobbyist.
dumb
A button collector??
normally .you call one .a letterologist.
a hoarder x)
Graphologist comes to mind or autograph hunter.
Someone with too much time on their hands and too much space?
fish keeper
An Arctophile.