If one wants, one can buy a small (10cm^3) sealed plastic pouch,
filled with coloured water, and a small goldfish of turtle. I guess
they live for about a day before the colouring or the lack of air or
the general being trapped and worn on a neckless kills them.
These fish were much luckier. They happily live in a cafe near our hotel in Beijing. There are many excellent cakes!