The Pattern of Bioaccumulation of Heavy Metals Mercury, Zinc and Nickel in the Soft Tissues of the Blue Swimming Crab (Portunus segnis) in Makoran Coasts
Subject Areas : Journal of Animal BiologySamaneh Ebrahimi 1 , Mohammad Mansour Tootooni 2 , Mehran Loghmani 3 *
1 - داور
2 - Department of Marine Biology, Faculty of Marine Sciences, Chabahar Maritime University, Chabahar, Iran
3 - Department of Marine Biology, Faculty of Marine Sciences, Chabahar Maritime University, Chabahar, Iran
Keywords: Heavy metals, blue-swimming crab, Makoran coasts, hepatopancreas,
Abstract :
The aim of the present study, considering the increasing level of heavy metal pollution and their impact on the environment, was to evaluate the bioaccumulation of heavy metals mercury, zinc and nickel in soft tissues (muscle and hepatopancreas) of the blue swimming crab (Portunus segnis) on the coasts of Makoran (Bris, Pesem and Tis). 18 crab samples and 9 surface sediment samples were collected in the winter of 2019 and the concentrations of mercury, zinc and nickel in the hepatopancreas and muscle tissues of the crab and sediments of the sampling areas were measured by atomic absorption spectrometry. In all three stations, the concentration of zinc in the hepatopancreas was higher than in the muscle and there was a statistically significant difference between all stations (p < 0.05). The overall average accumulation of mercury, zinc and nickel metals in mg/kg in hepatopancreas was 0.85 ± 0.7, 240.81 ± 101.41 and 69.24 ± 33.58 in muscle 0.37 ± 0.04, 78.45 ± 14.02 and 33.01 ± 9.12 and in sediment 0.96 ± 0.6, 26.4 ± 14.45 and 21.49 ± 6.21. The pattern of heavy metal accumulation in tissue and sediment was obtained as mercury < nickel < zinc. Comparison of metal concentrations in the muscle of the blue-swimming crab of the study area with international standards (UK MAFF, FDA, NHMRC, WHO and FAO) showed that the mercury concentration was lower than the NHMRC standard and close to other standards, the zinc concentration was higher than the permissible limit compared to only some standards, and the nickel concentration was lower than the permissible limit announced by the FDA. Therefore, the consumption of the studied crab meat in terms of mercury and especially zinc may be harmful to health. Comparison of the average concentration of heavy metals in sediments sampled from the stations with sediment quality standards showed low concentrations of zinc, nickel and mercury.
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