these things called fish are being depleted faster than they can be replaced. Aquaculture can work but the most economically feasible species are mostly tropical so require heat and input of land crops as a food source. overall roughly a 2:1 conversion ratio on feed. Better than any other land animal but still has it's limits.

vertical integration is only useful for living quarters. buildings shade arable land making it less productive. Try putting a section of garden under a tree and grow food crops. Yields drop substantially.

Melt down the copper, add around 12% tin, and make yourself an awesome replica greek helmet or a bronze axe. Keep it on your desk at work as a symbol of your coolness