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Abstract：
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.
摘要：
这项研究评估了埃塞俄比亚-齐韦湖三个水生生态系统中尼罗罗非鱼（Oreochromisniloticus）组织的矿物质和有毒微量元素浓度的差异，Langano湖,和GilgelGibe水库-专注于可食用（鱼片）和丢弃（消化道，ill,皮肤,和肝脏）部分。共收集了六十个（n=60）尼罗罗非鱼样品，包括来自每个湖的二十条（n=20）鱼，电感耦合等离子体质谱分析。所有元素在组织之间和湖泊之间都有明显差异。元素浓度的某些差异归因于生态系统中养分负荷和组织功能的差异。例如,富含钙的Langano湖的鱼中皮肤和g中的钙浓度明显更高。d-iscarded部分富含必需的微量元素，展示了促进它们在人类营养中的使用的机会，以增加重要矿物质的摄入量。然而,积累对人类有毒的元素，如铝，应该被监控，特别是,在水产养殖中饲养这些鱼时受到控制。
