Bioaccumulation and elimination of nickel in the organs of black fish (Capoeta fusca)

Abstract

Since toxicity is based on the effect that a toxicant produces at a target site within an organism, establishing the relationship between the concentration of substance at the target site and the subsequent toxic effect can provide a tool for predicting toxicity. This article aims to investigate the patterns of bioaccumulation and elimination of nickel in the selected organs of black fish (Capoeta fusca) exposed to two treatments of nickel (4.5 and 12.7 mg/L) for a period of 30 days. Nickel was assayed using Shimadzu AA 680 atomic absorption spectrophotometer, and the results were given as μg/g wet weight. This finding showed that the accumulation patterns of nickel, for lower sub-lethal (LSL) and higher sub-lethal (HSL) concentrations of nickel, are in the following order: gill > liver > muscle > skin. The elimination patterns of nickel are in the following order: gill > skin > muscle > liver, for LSL concentration, and gill > skin > liver > muscle, for HSL concentration of nickel. The results show that the target organ for accumulation and elimination of nickel is gill.

Bioaccumulation and elimination rate of cobalt in Capoeta fusca under controlled conditions

“…Cobalt concentrations in muscle and skin increased 24 times and 25 times (from 0.24±0.06 to 5.91±0.24 and from 0.18±0.03 to 4.64±0.12 μg g -1 ), after chronic exposure, respectively. This is similar to that found by Houserova et al (2006) and Mansouri et al (2012b), where the rate of bioaccumulation in skin tissue was lower than those in the liver and gills. The mucogenic activity of the skin epithelium in fish is very high compared to gills (for accumulation) (Paul and Banerjee, 1997).…”

“…In the present study, the skin and gills showed the greatest elimination of Co to sublethal concentration. Studies by Kalay and Canli (2000), and Mansouri et al (2012b) showed that the fish gill is a more effective organ for metal elimination than either the liver or muscle.…”

“…The tissues were accurately weighed into 150-mL Erlenmeyer flasks and 10 mL nitric acid (65% HNO 3 , Merck, Germany) was added to each sample. The samples were then left overnight for slow digestion (Mansouri et al, 2012b). Thereafter 5 mL perchloric acid (70% HClO 4 , Merck, Germany) was added to each sample.…”

“…Thereafter 5 mL perchloric acid (70% HClO 4 , Merck, Germany) was added to each sample. Digestion was performed on a hot plate (sand bath) at 200°C, for about 6h or until the solutions were clear (Ebrahimpour and Mushrifah, 2010;Mansouri et al, 2012b). The digested samples were diluted by 50 mL distilled water.…”

“…Fish is an important part of the human diet and it is important to know the concentrations of metals in fish tissue. Mansouri et al (2012b) investigated bioaccumulation and elimination of nickel (Ni) in selected tissues of Capoeta fusca. studied the influence of water hardness on acute toxicity of copper (Cu) and zinc (Zn) on Capoeta fusca.…”