All relatively good ideas in principle, however materials and manpower might be a bit scarce to put them into practice. I can see however a handful of buildings having some of the ideas implemented - those in the heart of strongly held areas.
Fish, while a great idea (and one I'd definately be working towards) has it's own problems - where do you get your stock in the first place? Isn't the waterways around NYC seawater in which case you've got real problems keeping the water in your tank/pool/etc from simply killing your fish.
Freshwater fish solve that issue, however it raises another - where do you get enough live freshwater fish?
All problems can be surmounted given time and resources, but I don't see them as available in the first 5-6 years after the nukes, possibly even longer.
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