Tubs filled with live carp have been out at many places around Prague since Monday. Carp is the main part of Czech Christmas dinner on December 24 and is usually served with potato salad. The majority of Christmas carp comes from the ponds of Třeboň in Southern Bohemia where it is specially raised.
Some people buy carp live and keep it in the bathtub for a few days to entertain their children. A strange custom, I know.