I too have serious misgivings about aquaponics. It is always presented as
some kind of perpetual motion machine that provides for all its needs within
the system, which I doubt. I also do not believe that it could possible
have the nutrients necessary for providing wholesome and nutritious
foodstuff. We are talking about the primary nutrient source being fish dung
in this closed system, where does the selenium, calcium and phosphorous come
from? The co-evolution of plants with soil organisms and minerals has
created the human nutrition story and without soil I think the actual
nutrient content will be woefully inadequate.
I would love to see some data on nutrient content of hydroponic vs soil
based vegetables.
I would also point out that both the rice paddy system and chinampa systems
are soil based systems with a lot of water to maintain growth they are not
by any means hydroponic or aquaponic. You might also throw in the fast
disappearing mangroves as an example of aquaponics but again you would be
wrong.
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