Assessment the accumulation of heavy metals in muscle tissue of Whiteleg shrimp (Litopenaeus vannamei) in shrimp culture farms in the Sistan and Baluchistan

Document Type : Research Paper

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Abstract

We studied the accumulation of heavy metals (Zn, Cd, Ni and Pb) in muscle tissue of Whiteleg shrimp (Litopenaeus vannamei)sampled from shrimp farms in the Sistan Baluchistan, Iran. Sampling were conducted in April to June 2018 at three-time points of 35, 65 and 95 days after stocking in ponds randomly with three replications from two farms and two pools. After biometry, muscle tissue was isolated and the amount of metal accumulation was measured using flame atomic absorption apparatus. Results showed that the mean length (cm) and weight (g) were 6.15±0.65 and 4±0.8 in 35 days after stocking,10.63±0.73 and 9.61±1.63 in 65 days after stocking and 12.33 ± 0.51 and 16.04±1.33 in 95 days after stocking. The results showed a significant difference between the concentrations of zinc, cadmium, nickel and lead in sampling pools (p < 0.05).The results did not show a significant difference between the pools at each time interval (p>0.05).The trend in heavy metal accumulation muscle tissue was increasing after stocking. The mean concentration of metals was 11.52±0.42 for copper, 82.95±6.65 for zinc, 3.54±0.47 for cadmium, 2.18±0.31 for nickel and 1.85±0.19 for lead (μg/g dry weight).  With the exception of nickel, which was slightly higher than the WHO standard, other metals were lower than the standard values reported by International Food and Drug Administration (FDA) and the World Health Organization (WHO).

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Iranian Scientific Fisheries Journal
Volume 29, Issue 5
January and February 2021
Pages 79-88

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