I've noticed the virtual disappearance of butcher's, fishmongers and bake shops from the Warsaw scene
Are you really in Poland?
here in wroclaw. much the same as it was twenty years ago with regard to the butcher, baker, fishmonger.
Same here in Krakow, it's chokablock with butchers, green grocers and especially bakeries.
Fish mongers... you can get fish in shops, it's fierce expensive compared to other dead animals and we are a fair bit from the sea...
I miss fresh fish, there are loads of frozen white meat fish but they don't taste very good. I don't know of any fishmongers though, although there are plenty of Sushi bars.
The best fresh fish you can get around here is fresh water trout, it's great.