Metal accumulation in muscle and oxidative stress response in the liver of juvenile Oreochromis niloticus from contaminated sediment under a simulation of increasing temperature

• Published in: Environmental Research Communications 2022-07, Vol.4 (7), p.75008
• Main Authors: Ihunwo, O C, Ibezim-Ezeani, M U
• Format: Article
• Language: English
• Subjects: Ambient temperature; Bioaccumulation; Bioavailability; Cadmium; Chromium; Contaminants; contaminated sediment; Contaminated sediments; Contamination; Enzymatic activity; Fish; global climate change; Glutathione; Glutathione peroxidase; Glutathione reductase; Glutathione transferase; Groundwater; Heavy metals; increasing temperature; Juveniles; Lead; Liver; Mathematical analysis; Metals; Muscles; Nickel; Niger Delta; Oreochromis niloticus; Oxidative stress; Peroxidase; Pollution index; Reductases; Sediment pollution; Superoxide dismutase; Surface water; Survival; Tilapia; Water temperature
• ISSN: 2515-7620; 2515-7620
• DOI: 10.1088/2515-7620/ac803d

In the present study, a mesocosm experiment with contaminated sediment and clean groundwater using juvenile Oreochromis niloticus was set up to assess the effect of increasing temperature on bioaccumulation of metal in fish muscles (cadmium, chromium, nickel, and lead) and enzymatic activities in fish liver [reduced glutathione (GSH), glutathione reductase (GR), superoxide dismutase (SOD), glutathione transferase (GST), and glutathione peroxidase (GSH Px)]. The trend of temperature variation was Control 1 (0 Watts)  Ni. Mean metal pollution index (MPI) in fish muscles was lowest at 0 watts (24 h − 7.86 ± 1.72, 72 h − 25.77 ± 4.56) and highest at 100 watts (24 h − 39.45 ± 1.91, 72 h − 55.82 ± 1.05). Controls 1 and 2 showed no significant difference in the concentration of GSH and GR while showing a significant difference in GST and GSH Px concentrations after 24 and 72 h. Pearson’s correlation showed that GSH was inhibited by water temperature and, Cd, Cr, and Pb concentrations in surface water and fish. Therefore, an increase in ambient temperature in an already contaminated environment will increase the bioavailability of metal contaminants leading to an increase in bioaccumulation and exacerbation of oxidative stress in juvenile tilapia.