...Permaculture design therefore seeks to minimize waste, human labor, and energy input by building systems with maximal benefits between design elements to achieve a high level of synergy. Permaculture designs evolve over time by taking into account these relationships and elements and can become extremely complex systems that produce a high density of food and materials with minimal input
Would think that Aquaponics would fit into this description. Aquaculture is the raising of fish, Hydroponics is growing plants in soil-less media. The blending of Aquaculture and Hydroponics gives you Aquaponics. Raising fish in a tank, pumping the fish waste water to growbeds where it is filtered with some sort of media - gravel/expanded clay balls which then grows plants. Water flows back into the tank nice and clean. No salmonella or E-coli worries.
My current system is small with low input of fish feed and grows most everything I have tried. Arugula, spinach, buttercruch lettuce, squash, corn, strawberries, basil, rhubarb, carrots, millet, Tomatoes (Lord help us, the tomatoes this thing put out), peppers, broccoli.
Small pump with low wattage running 24/7, autosiphons to drain the water from the blue barrel growbeds. Lots of fun to create, but not much to do after it is built except sprinkle seeds, feed the fish, harvest, and some occasional clearing of roots out of my siphon drain pipes.
And covered with chicken wire to keep the girls from the "buffet line"
Working on hugulkultur beds, planting fruit trees, berry bushes, perennials, and writing books