For quite a while now one of the family goldfish has been spending time here and there upside down looking very much like it had bought the farm.
It's just faking...
After a little while he'll just snap out of it then get back to doing regular goldfishy stuff.
The question is why?
I think that it's trying to fake its own death. Maybe it's hoping that the ruse will lead to a quick flush to freedom where it can start over in as member of a koi pond commune or a really pretty carp. ( it's a goldfish, how well could it have thought this through?)
We'll call this Fishwatch : Day 1