The problem I see with large fishing boats is that of fuel. Where are they going to get it, how much will they have to pay for it, and so on.
The larger boats can potentially catch tonnes of fish in a short period of time, but with food in such a short supply in the city already, little will be available to brew alcohol.
Perhaps it takes several months to brew enough for a two day voyage, maybe they have to be based many miles away and travel, or maybe raiding for fuel is an option (both on land at at sea).
Smaller wind powered boats are likely to be common, however I'm thinking there's likely to be a skill shortage for sailing them and they're not exactly all weather vessels. A decent storm is going to keep them in port and out of production for days.
Fishing in the immediate area is likely to be poor with centries of city development polluting the waterways and overfishing depleting prewar stocks. Three years after the nukes, the chemical pollutants are probably still there with the added radioactive pollution not helping the situation.
Fish stocks may have increased due to less intensive fishing, but you'd have to be hungry to risk chemical and radiation poisioning (but them these people are effectively living next to a couple of nuke craters...)
In my mind, cities are not the place to be post nuke. Fine for a visit and quick scavenge, but you wouldn't want to live there.
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