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Showing 3 results for Food Chain
Total mercury bioaccumulation tracking in a fresh water food chain, (Sanandaj Gheshlagh Dam Reservoir, Iran)
Sh Zare, Sh Kaboodvandpour,
Volume 7, Issue 3 (5-2014)
Abstract

Background and Objectives: Due to the importance of Sanandaj Gheshlagh Reservoir (SGR) in the region and proven mercury pollution in SGR water, a research project was carried out to determine the amount of mercury concentration and bioaccumulation and its behavior through a food route in SGR food chain (i.e., water, sediments, fish, and human).This was done, because it has been reported that mercury concentration and its toxicity could increase during mercury exchange between trophic levels. Materials and methods: During April to December 2012, 24 water, sediment, and fish samples (Capoetta trutta) (4 samples per month) from SGR and 24 human hair samples from Sarab Ghamish village settlers (the major Capoetta trutta consumers in the region) were collected. Results: Total mercury mean concentration in water, sediment, Capoeta trutta, and human hair were 0.0028±0.000128, 0.110±0.0057, 0.296±0.0119, 2.059±0.1704 ppm respectively. Calculated bioconcentration factors were 4 × 10 and 1 × 102 in SGR sediment and fish, and related biomagnifications factors were 40 and 5 respectively. Conclusion: Due to the high bioaccumulation, biomagnifications factors and mercury concentration recorded in edible parts of SGR fish, local consumers should not eat more than 1182 gram of this fish weekly without accounting for other potential sources of total mercury in their food basket.


Investigation of microplastic contamination in the gastrointestinal tract of some species of caught fish from Oman Sea
Kh Ghattavi, A Naji, S Kord,
Volume 12, Issue 1 (5-2019)
Abstract
Background and Objective: Marine pollution is growing due to human activities. Continuous increase in plastic production and poor management of plastic waste resulted in a significant increase of this contaminant in aquatic environments. This in turn led to the widespread presence of Microplastics (MPs) with a size of less than 5mm.
Materials and Methods: In this study, frequency, distribution, color and type of MPs in the gastrointestinal tract of fish in Oman Sea were investigated using random sampling, tissue digestion and flotation of MPs.
Results: The total number of the MPs found in the studied species was variable. The highest number of MPs were found in the species belonged to Rastrelliger kanagurta and Nemipterus japonicus (29%) and Saurida tumbil, Trichiurus lepturus and Paragaleus randalli (14%).
Conclusion: The forms mostly observed were belonged to microfibres (86%), fragment (11%) and pellet (3%). The most frequent colors that were detected were in a decreasing order blue, pink and black. The results demonstrated that the highest concentrations of MPs were observed in Ratrelliger kanagurta and Nemipterus japonicus species. The present study provides useful information for further research, and a background analysis to monitore the pollutants in the Oman Sea.
 

Assessment of microplastics in the gastrointestinal tract of some fish caught for human consumption in Bandar Abbas, the Persian Gulf
Kh Ghattavi, A Naji,
Volume 12, Issue 3 (12-2019)
Abstract
Background and Objective: Microplastics (MPs) are well-known emerging contaminants in the marine environment. A key route by which MPs can directly affect marine life is through ingestion.
Materials and Methods: In order to investigate and measure MPs in the Persian Gulf, random sampling and digestion of tissues and flotation of MPs were used. This method has been used to study the frequency, distribution, shape and color of MPs in in the digestive system of fish in the Persian Gulf.
Results: According to the results, the highest concentration of extracted MPs were found in Sillago sihama (62%), Diagramma pictum (26%), Lutjanus johnii (6%), Otolithes ruber (5%), Epinephelus coioides (1%). However, MPs were not observed in Scomberomorus commerson.
Conclusion: The relative contribution of different forms of MPs in any fish showed that microfibers with the most abundant forms of MPs and fragments and films were observed to have the lowest concentration of 11% and 2%, respectively. Based on our results, it is suggested that Sillago sihama is suitable indicator of MPs contamination among  studied fish in the Persian Gulf. Ingestion of MPs provides a potential pathway for the transfer of plastic additives, metals, PAHs and other POPs to wildlife and human consumers of fish. Therefore, more comprehensive investigations on MPs and nano-plstics should be conducted in food chain of seafood.
 

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