There's actually a sizeable Brazilian community in Zürich, many of them living in Kreis 4. There are quite a few shops and other businesses (such as hairdressers) catering to them. There are also several restaurants but I can't give any recommendations.

Great tips, thank you.
I lived in Porto for four years and still miss the wonderful, fresh, fishy food.
I'll be checking out these recommendations.
Muito obrigada!

I know it is off topic but i lived in Porto 27 years

In Il Gallo Restaurant in Escher Wyss i ate a fresh fish very good.

35 chf for Switzerland and quality i think it is not expensive.

If you guys keep making posts out of topic, I'm going to start slapping you with a fresh sole! *joking*

There is a restaurant in Stäfa "Gasthof zur Sonne" that makes some really nice fish. It has a little bit more than the usual 2 fishy options, and it's served in very nice ambient. It has a gorgeous view to the lake.

My favourite place for fish in Zürich is the Primitivo, by Letten. Nothing beats the feeling of eating a freshly caught trout while sitting on cushions in an open tent. Caesar himself can't have had such good trout, at least not in Zurich.

I went to Atlantico Marisqueira in Altstetten on Friday night and really enjoyed it overall. The wait for our first course was a little long, but to be fair, we arrived just after a table of about 15 or so was seated. Otherwise service was very good. I had grilled dorado and the texture and flavour was wonderful.

I tried calling Esquina but their phone line was dead and their website no longer exists. Not a good sign.

"Marisqueira" isn't the name of the restaurant. In portuguese it stands for a restaurant where you mostly eat seafood.
The place is actually called "Atlântico" or, if you prefer, "Marisqueira Atlântico".

It's a great place. I was even able to get them to cook francesinhas for us (francesinha is a typical fast-food dish from Porto).
I must say it was quite an adventure to find francesinhas in Zurich, now only the natas are missing

[QUOTE=I tried calling Esquina but their phone line was dead and their website no longer exists. Not a good sign.[/QUOTE]

Just say this post now, but went to Esquina last week and they are no longer there.