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effective aquaculture City brings to urban centers, with tanks in the car to provide sustainable food for city dwellers

farms have sparked controversy in the estuaries of North Atlantic salmon and the Mediterranean, with fishermen and environmentalists who claim that their products are seriously damaging the natural habitat.

But a project in Germany aims to feed the growing urban population aquaculture contributes to urban centers, with tanks on rooftops and parking and the use of waste for growing vegetables.

The idea is simple. Perch swim in the water tanks of metal and ammonia excretion is used to fertilize tomatoes, salad leaves and herbs grown in a greenhouse mounted above. Aquaponics fish and vegetable farms aim to provide an autonomous system designed to provide citizens with organic food, locally grown sustainable.

"We need to think in systems that allow us to produce food in a very efficient use of resources," said co-founder of the effectiveness of urban agriculture, Nicolas Leschke, as he showed visitors around the farm prototype small container in the courtyard of a former malt factory in Berlin's Schöneberg district.

on stilts, containers efficient farming town can be set almost anywhere, Leschke said, and farmers should keep in mind the water and feed the fish. A small electrical current is needed to pump water enriched with nitrate aquariums up hydroponic gardening. "As long as you add food, water, electricity and fish these hi-tech gardens last forever," he added.

ASTAF Pro system, developed by scientists from the Leibniz Institute for Berlin efficient equipment allows control of aquaponic farmers about the nitrate levels in the water to maximize the yield of fish and vegetables. And urban populations expected to increase in the coming decades, there will be a lot of mouths to feed. Half the world's population are urban dwellers, a figure that will rise to the UN nearly 70% in 2050.
But the idea is not going to save the world overnight because the cost of the technology - up to ? 35,000 for a single container - means that only large farms with higher yields rates are economically viable. "Our products are not cheap. We are not the solution to the world's problems, but it is a step in the right direction, "said Leschke.

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