An interesting technology to improve aquaculture in a more sustainable way is called ‘biofloc aquaculture’. The biofloc technology is based on the balance between carbon and nitrogen in solution. In this way, the nitrogenous wastewater of the aquaculture tank (with ammonium in addition), will become converted into bacterial biomass, which can be used to feed the organisms in the aquaculture tanks. Phytoplankton, bacteria and grazers of these bacteria aggregate together into these bioflocs. For the system to work, an additional carbon source needs to be added to the system. Bioflocs can be implemented in the aquaculture tank itself, or in a separated bioflocs reactor. The advantages are minimal water exchange, low cost production of a food source and a lower cost for water treatment. Further research needs to improve the aeration of the systems (Crab et al., 2012). Here you see me working together with Elaheh, setting up the biofloc system. We prepared 5 bottles with saline water and each of the tanks got a different bacterial colony (4 colonies, 1 control). Each batch got an equal amount of nitrogen, but the amount of carbon depends on the type of bacterial colony. In a non-experimental setting, the nitrogen source would be the wastewater of the aquaculture organisms. From this set up, the temperature, oxygen percentage and nitrogen level will be monitored on a daily basis. Nitrogen and/or carbon will be added, depending on the values of these parameters. Regularly, the bioflocs will be monitored, to figure out which type of colony is the optimal one to use.