Evaluation of Relationship between Fatty acids and Heavy Metals Accumulation (Cd, Pb, Hg, Cu) in Fillet, Liver and Skin Tissues of Stellet Sturgeon (Acipenser stellatus) in Southwest and Southeast of Caspian Sea

Document Type : Full Research Paper

Authors

1 Fisheries Department, College of Agriculture and Natural Resources, Qaemshahr Branch, Islamic Azad University, PO Box: 163, Qaemshahr, Iran

2 Department of Chemistry Engineering, College of Engineering and Technology,

3 Department of Food Science and Technology, College of Agriculture and Food Sciences, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran.

Abstract

Study of acute accumulation of heavy metals (Cd, Pb, Hg and Cu) in tissues of fillet, liver and skin of stellate sturgeons was done in Southwest (SW) and Southeast (SE) coasts (Mazandaran and Golestan provinces) of Caspian Sea. In this study the relationship between tissues heavy metals accumulation and fatty acids were investigated, in such valuable and popular sturgeon species. The results showed that all measured heavy metals were in standard range and there was no difference between the two area (p<0.05), but heavy metals concentration in fish liver was more than that in fillet and skin (p<0.05). The Cd in the fish liver was higher than the acceptable range in both SE and SW coasts (0.22 and 0.26 µg/g, respectively) (p<0.05). Hg amounts were higher in the stellate surgeon skin than in other organs in both SE and SW coasts, (0.11 and 0.42 µg/g, respectively). Also, in SW coast samples, the heavy metals accumulation was higher than in SE. The pattern of heavy metals accumulation in the fish fillet was different from liver and skin. On the other hand, total unsaturated fatty acids (UFA) were 89.12 and 80.84 g/100g in samples of SW and SE coasts, respectively (p<0.05). Total omega-3 was 18.45 and 13.42 g/100g, respectively (p<0.05) in the same samples. In addition, there was a specified relationship in different organs between fish fatty acids and amounts of heavy metals. This relationship was a positive correlation in tissues of liver (R2 = 0.824), skin (R2 = 0.818) and fillet (R2 = 0.627) of the sturgeon fish. On the contrary, the heavy metals decreased according to increase in omega-3 fatty acids in sturgeon fillet (R2 = 0.021) . The results also indicated that stellate sturgeon had relative safety and non-hyper contamination by heavy metals.

Keywords

References

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Veterinary Research & Biological Products
Volume 30, Issue 3 - Serial Number 116
September 2017
Pages 212-224

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History

  • Receive Date: 11 May 2016
  • Revise Date: 07 October 2016
  • Accept Date: 08 October 2016

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