Accumulation and elimination of mercury in Nile Tilapia (Oreochromis niloticus) under an elevated temperature and its ambient concentrations

Abstract

Abstract. Sunardi, Astari AJ, Pribadi TDK, Rosada KK. 2017. Accumulation and elimination of mercury in Nile Tilapia (Oreochromis niloticus) under an elevated temperature and its ambient concentrations. Nusantara Bioscience 9: 18-22. The problems of heavy metal pollution combined with the issue of climate warming has attracted a growing international concern, particularly to those exert very toxic effects to organisms and human, e.g. mercury. There have been evidences for temperature effect on metal uptake, accumulation and toxicity; but only few of those on metal elimination. An experimental work was set up to investigate the effect of higher water temperature and ambient concentration on both accumulation and elimination of mercury in Nile Tilapia (Oreochromis niloticus). Using 50-L aquarium, fish were exposed to room and 32 o C temperature combined with 10 and 20 µg/kg Hg concentration. Test fish were treated for 28 days for accumulation phase, and then transferred to Hg-free water for 7 days for elimination. Data of the Hg accumulation and elimination from the flesh, liver and kidney were analyzed using one-way Anova. The results indicated that higher water temperature and ambient mercury have increased accumulation in the liver and the kidney, but not in the flesh. Higher rate of Hg elimination occurred in higher water temperature resulting Hg deposits did not differ among treatments. However, the Hg deposits remained higher compared to those in the original state representing a potential risk to either fish or human. The kidney and the liver of Nile Tilapia seemed to be the preferable depository organs for mercury.

Population dynamics and feeding habit of Oreochromis niloticus and O. mossambicus in Siombak Tropical Coastal Lake, North Sumatra, Indonesia

“…According to El-Sayed (2020), other advantages include resistance to water quality and disease, broad tolerance to environmental quality, efficient ability to form high-quality protein from organic matter, domestic waste, and agriculture. Tilapia can tolerate waters with heavy metal waste (Novebrianto et al 2011;Sunardi et al 2017;Ouma et al 2019).…”

Effects of Temperature and Different Feed Uptake on Mercury (Hg) and Cadmium (Cd) Accumulation in Nile Tilapia

“…The results of this study indicated that the accumulation of Hg and Cd in the flesh, liver and kidney of Nile tilapia increased with increasing temperature. The effect of elevated temperature combined with Hg and Cd exposure might have increased fish respiration rate and the uptake of water across the gills (Sunardi et al, 2017). In the same way, high temperature results in a decrease of dissolved oxygen, a situation that fish might be able to tolerate .…”

“…Numerous studies report that metal toxicity in fish is often increased with increasing temperature, and that it is linked to higher metal accumulation. For example, increasing temperature was found to increase cadmiumtoxicity in yellow perch (Baykan et al, 2007;Grasset et al, 2016), lead toxicity inPangasius hypophthalmus , copper susceptibility in fathead minnow (Lapointe et al, 2011), and mercury toxicity in Nile tilapia (Sunardi et al, 2017).…”