Free Lunch explores in depth the possibilities for utilising office spaces to feed their occupants, developing the decorative aquarium into a sustainable system that could produce a fish/salad meal for office workers.
There is no such thing as sustainable product, only the bi-products of a sustainable system. To be sustainable, first we must establish a closed-loop system and the carrying capacity, then the system must be managed and not over- or under-consumed.
Aquaponics is the embodiment of a sustainable system. At its core it is the creation of a symbiotic relationship between fish and plants. Fish waste in the form of ammonia is turned into nitrite then nitrates by bacteria in the water. When filtered through a plant bed, the plants clean the water for the fish to live in, creating a closed-loop system with two food crops.
A system with a 225-litre volume fish tank can grow as much as ten 15cm plants per week – enough for a decent bunch of basil or salad leaves – on a four-week cycle. To produce decent-sized, edible fish stock (such as 18cm carp) the tank would need to be twice the size of the prototype displayed here. The use of smaller fish is not normal practice in aquaponics, so my research into the ideal stock for a food source system is ongoing. The system needs to be kept in balance, not harvesting too many plants or fish at one time, as this would affect the health of the other produce...
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