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Feeding accounts for 50%-60% of fish farming production costs, which is approximately COP $2,813 (USD $ 1) for each kilogram of fish (Brú-Cordero et al. 2017). In order to develop sustainable aquaculture systems, alternative sources of high quality protein, the main limiting factor, will have to be identified to replace high-cost ingredients (Mbahinzireki et al., 2001; Bauer et al., 2012). Studies indicate that just about 20-35% of the nitrogen from fish diets is actually retained, with the remainder being lost as ammonia and organic nitrogen in feces and feed residue (Najdegerami et al, 2016). Recycling of nutrients occurs within fish tanks, and they can be used as an agricultural fertilizer or for feeding aquatic organisms at reduced scales (Hargreaves, 2013). Therefore, it is important to determine if alternative ingredients such as derived from biologically treating fish waste could be a suitable replacement ingredient for aquaculture diets, offering a sustainable option to fishmeal or even soy meal (Kuhn et al., 2010).

Proximal and sensory analysis of red tilapia (Oreochromis sp.) fed with fish tanks sediments from a Biofloc culture