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Article

Effects of Dissolved Potassium on Growth Performance, Body Composition, and Welfare of Juvenile African Catfish (Clarias gariepinus)

1
Professorship Aquaculture and Sea-Ranching, Faculty of Agricultural and Environmental Sciences, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany
2
Aquaculture & Fisheries, Wageningen University and Research, Droevendaalsesteeg 2, 6708 PB Wageningen, The Netherlands
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this study.
Academic Editor: Cosmas Nathanailides
Received: 5 March 2021 / Revised: 25 March 2021 / Accepted: 25 March 2021 / Published: 28 March 2021
(This article belongs to the Special Issue Environmental Impacts of Land-Based Aquaculture)
Optimal crop production in aquaponics is influenced by water pH and potassium concentrations. The addition of potassium hydroxide (KOH) into the recirculating aquaculture system (RAS) may benefit aquaponics by increasing the water pH for better biofilter activity and supplementing K for better plant growth and quality. We investigated the growth, feed conversion, body composition and welfare indicators of juvenile African catfish (Clarias gariepinus) treated with four concentrations of K (K0 = 2, K200 = 218, K400 = 418, and K600 = 671 mg L−1). While growth, feed conversion and final body composition were unaffected, the feeding time and individual resting significantly increased with increasing K+. The swimming activity and agonistic behavior were reduced significantly under increased concentrations of K+. Leftover feed and the highest number of skin lesions were observed under K600. We suggest that K+ concentrations between 200 and 400 mg L−1 can improve the welfare status of juvenile African catfish. This enables the application of KOH in RAS to supply alkalinity to achieve optimum nitrification at minimum water exchange and improve the nutritional profile of the process water with benefits for the welfare status of African catfish and aquaponics plant production and quality. View Full-Text
Keywords: African catfish; Clarias gariepinus; aquaponics; nutrient management; potassium; plant growth; plant quality; animal welfare; water quality African catfish; Clarias gariepinus; aquaponics; nutrient management; potassium; plant growth; plant quality; animal welfare; water quality
MDPI and ACS Style

Wenzel, L.C.; Strauch, S.M.; Eding, E.; Presas-Basalo, F.X.; Wasenitz, B.; Palm, H.W. Effects of Dissolved Potassium on Growth Performance, Body Composition, and Welfare of Juvenile African Catfish (Clarias gariepinus). Fishes 2021, 6, 11. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes6020011

AMA Style

Wenzel LC, Strauch SM, Eding E, Presas-Basalo FX, Wasenitz B, Palm HW. Effects of Dissolved Potassium on Growth Performance, Body Composition, and Welfare of Juvenile African Catfish (Clarias gariepinus). Fishes. 2021; 6(2):11. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes6020011

Chicago/Turabian Style

Wenzel, Lisa C., Sebastian M. Strauch, Ep Eding, Francisco X. Presas-Basalo, Berit Wasenitz, and Harry W. Palm 2021. "Effects of Dissolved Potassium on Growth Performance, Body Composition, and Welfare of Juvenile African Catfish (Clarias gariepinus)" Fishes 6, no. 2: 11. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes6020011

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