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

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.

Enhancement of nutritional quality and shelf life of fish products (powder & chapatti) via fortifying with orange‐fleshed sweet potato

“…Bayissa et al. ( 2021 ) reported that some macrominerals of Nile tilapia fish filet in dry bases in three different Ethiopia lakes that are 220–240 mg/100 g for Ca, 100–300 mg/kg for Na and 80–140 mg/100 g for Mg which is slightly agreed with the present result. Also, the Na and K content in Nile tilapia powder is agreed with 153.204 ± 2.99–207.182 ± 4.69 mg/100 g and 140.21 ± 8.00–186.16 mg/100 g in dry bases, respectively, as reported by Tsegay et al.…”

“…In this study, the iron content of OFSP and Nile tilapia fish powder have significant differences between their mean (p ≤ .05), and their result was 3.01 ± 0.03 and 18.82 ± 0.12 mg/100 g, respectively. The iron content of Nile tilapia fish powder was lower than 22.8-24.9 mg/100 g, which reported that the iron content of dried OFSP was 1.19-5.1 mg/100 g, which agreed with the present result (Bayissa et al, 2021;Nicanuru et al (2015)).…”

“…The concentration of Cu determined in the Nile tilapia fish powder and OFSP flour was 0.84 ± 0.038 and 0.16 ± 0.02 mg/100 g, respectively. This concentration of Cu in Nile tilapia was above 0.16-0.5 mg/100 g, as reported by Bayissa et al (2021), and it was lower than 1.08 mg/100 g reported by Ejike and Liman (2017) in the same species and tissues of fish in dry bases.…”

“…The iron content of Nile tilapia fish powder was lower than 22.8–24.9 mg/100 g, which was reported by Bayissa et al. ( 2021 ). Also, Nicanuru et al.…”

Nutrient-related metabolite profiles explain differences in body composition and size in Nile tilapia (Oreochromis niloticus) from different lakes

“…Description of the three lakes in this study. Fish samples from the three lakes were used in this study, and a summary of limnological information is given in (Table 5) 37,45 . Lake Ziway is located in the central Rift www.nature.com/scientificreports/ third-largest freshwater lake in the country.…”