Sustainable Organic Aquaculture
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Key to a sustainable organic farming system is the circular reuse of resources. In this proposed organic tilapia aquafarm, the resources come from three farming systems: agriculture, livestock and aquaculture, at the center of which is the biodigester, which handles the resource recycling and produces supplementary energy for the farm.

Agriculture: locally grown corn, soya beans and peanuts, combined with processed fishmeal, oligo-vitamins and other supplements, provide the primary fish feed.

Livestock: chicken, pigs and goats produce meat, milk and eggs for consumption by farm workers and sale in the farm market.

Aquaculture: the tilapia pond is populated with Polycarp species, bottom-feeders that that help to clean the pond. Nutrient-rich effluent from the tilapia pond is fed into a duckweed pond, which helps to reduce the nutrient load. The duckweed in turn is fed to the livestock, while the Polycarp is ground into fishmeal for the tilapia.

Biodigester: livestock manure and agricultural biomass are fed into the biodigester. Biogas from the biodigester is used for cooking, producing hot water and electricity. The nutrient-rich effluent feeds algae and moina, which are fed to the tilapia. The sludge is used to cultivate high-value shitake mushrooms, which are sold, and grow protein-rich earthworms, which are in turn fed to the tilapia. Earthworms also produce vermiculture, used to enrich the soil on the farm.