Ydars said:It might make the smell worse; rotting fish is an awful smell and most fishing ports I have been to really stink in the morning, after the fishing boats dump their rubbish.
Also, you might want to consider that a city of 50,000 would have to have a very large fishing fleet to feed that many people without any input from cattle.
If you really want to go with this, the city would be heaving with fishermen.
Thanks - they have fishing, plus I'm sure there are enough farms around to supply the city with sheep, chickens & cows. The city is not poor by common medieval standards, both monetarily and resource-wise.