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Article

The Impact of Lake Ecosystems on Mineral Concentrations in Tissues of Nile Tilapia (Oreochromis niloticus L.)

1
Department of Nutrition, Genetics, and Ethology, Faculty of Veterinary Medicine, Ghent University, Heidestraat 19, 9820 Merelbeke, Belgium
2
Department of Biology, College of Natural Sciences, Jimma University, Jimma P.O. Box 378, Ethiopia
3
Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
*
Authors to whom correspondence should be addressed.
Academic Editors: Antony J Prabhu Philip, Johan W. Schrama and Ana Tomás Vidal
Animals 2021, 11(4), 1000; https://doi.org/10.3390/ani11041000
Received: 19 February 2021 / Revised: 16 March 2021 / Accepted: 31 March 2021 / Published: 2 April 2021
(This article belongs to the Special Issue Mineral Nutrition and Metabolism in Fish)
Fish are a source of minerals that is highly favored by consumers in most parts of the world. However, these minerals become toxic upon high-level intake and can accumulate toxic trace elements in different tissues. Nevertheless, mineral distribution in fish tissues is poorly evaluated. Analyzing tissue mineral distribution would help us to understand the physiological role of each tissue and the impact of the ecosystem on mineral and toxic trace element accumulation in the tissues. We evaluated the differences in mineral and toxic trace element concentrations of Nile tilapia (Oreochromis niloticus) tissues from three aquatic ecosystems. Distinct differences were observed between tissues in Nile tilapia; in addition, these concentrations were substantially affected by the lake the fish were caught from. The accumulation of elements toxic to humans, such as aluminum, should be monitored and, in particular, controlled when rearing these fish in aquaculture. Further investigation is warranted to identify the origin of the very high intestinal Fe concentration in all fish samples, which coincided with high concentrations of Al.
This study evaluates the differences in mineral and toxic trace element concentrations of Nile tilapia (Oreochromis niloticus) tissues from three aquatic ecosystems in Ethiopia—Lake Ziway, Lake Langano, and Gilgel Gibe reservoir—with a focus on edible (fillet) and discarded (digestive tract, gills, skin, and liver) parts. A total of sixty (n = 60) Nile tilapia samples were collected, comprising twenty (n = 20) fish from each lake, and analyzed by inductively coupled plasma mass spectrometry. All elements varied markedly among tissues and between the lakes. Some differences in element concentrations were attributed to differences in nutrient load in the ecosystems and the function of the tissues. For instance, the calcium concentrations in skin and gill were distinctly higher in fish from calcium-rich Lake Langano. The d iscarded parts were richer in essential trace elements, showing an opportunity to promote their use in human nutrition to increase the intake of important minerals. However, the accumulation of elements toxic to humans, such as aluminum, should be monitored and, in particular, controlled when rearing these fish in aquaculture. View Full-Text
Keywords: minerals; toxic trace elements; lake ecosystems; Oreochromis niloticus; fillet minerals; toxic trace elements; lake ecosystems; Oreochromis niloticus; fillet
MDPI and ACS Style

Bayissa, T.N.; Gobena, S.; Vanhauteghem, D.; Du Laing, G.; Kabeta, M.W.; Janssens, G.P.J. The Impact of Lake Ecosystems on Mineral Concentrations in Tissues of Nile Tilapia (Oreochromis niloticus L.). Animals 2021, 11, 1000. https://doi.org/10.3390/ani11041000

AMA Style

Bayissa TN, Gobena S, Vanhauteghem D, Du Laing G, Kabeta MW, Janssens GPJ. The Impact of Lake Ecosystems on Mineral Concentrations in Tissues of Nile Tilapia (Oreochromis niloticus L.). Animals. 2021; 11(4):1000. https://doi.org/10.3390/ani11041000

Chicago/Turabian Style

Bayissa, Tokuma N., Sangi Gobena, Donna Vanhauteghem, Gijs Du Laing, Mulugeta W. Kabeta, and Geert P.J. Janssens. 2021. "The Impact of Lake Ecosystems on Mineral Concentrations in Tissues of Nile Tilapia (Oreochromis niloticus L.)" Animals 11, no. 4: 1000. https://doi.org/10.3390/ani11041000

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