Potassium is an essential nutrient in aquaponics. This review starts elaborating on the different water potassium concentrations in Recirculating Aquaculture Systems (RAS), aquaponics, and hydroponic solutions to later illustrate the importance of potassium homeostasis and its role in fish organs and tissues. The discussion then is divided into potassium imbalances that lead to hyperkalaemia and hypokalaemia, along with its symptoms and consequences. Potential hyperkalaemia in African catfish reared at water potassium concentrations of 600 mg K +L -1 is also debated. This paper concludes with the recommended water potassium concentrations for African catfish in aquaponics.
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