Investigating the accumulation of some essential, semi-essential and non-essential elements in the muscle tissue of golden mullet in Gilan province and its relationship with the length and weight of the fish

Abstract

Introduction: Considering that the golden mullet (Chelon auratus) is one of the most consumed fish in the region, and it is important in terms of nutritional and economic value. It is special. This research was carried out in 2021 in order to determine the amount of some essential (copper, zinc), semi-essential (nickel, cobalt) and non-essential (lead, cadmium) elements in the muscle tissue of this fish, as well as the relationship between the amount of accumulation of these elements with total length and weight. done. Materials & methods: In this study, a number of 12 fishes were prepared in the two regions of the west and east of Gilan province, and after being transferred to the laboratory, the biometric characteristics (total length, weight) were determined, and after separating the muscle organs by the digestion method and acid mixture (acid Nitric/perchloric acid) chemical digestion of the samples was done and the concentration was determined using an inductively coupled plasma device with optical emission spectrum (ICP-OES). Results: The results of Pearson's correlation coefficient tests indicate a positive linear relationship between the amount of accumulation of copper, zinc, cadmium, nickel and lead elements with the factors of total length and weight of fish and the presence of a negative linear relationship between the amount of accumulation of cobalt metal with the aforementioned factors. The results of the analysis of fish samples showed that the average (± standard deviation) for the metals copper, cadmium, cobalt, lead, nickel and zinc respectively 0.491±0.045, 0.118±0.056, 0.032±0.011, 0.355±0.101, 0.076±0.013 and 9.546±0.05 micrograms per gram of dry weight, and there was no significant difference between the amount of accumulation of the studied elements in the fish of the two regions (P<0.05). Conclusion: The concentration of all elements measured in the muscle tissue of golden mackerel is lower than the standards declared by organizations such as: WHO, UK(MAFF), FAO/WHO, USEPA, USDA, FAO and NHMRC. However, the consumption of this type of fish does not pose any threat to health and public health. However, due to the importance of the quality of fish consumed by the residents of the northern regions of Iran, in order to control the number of pollutants in aquatic life and consuming communities, various pollutants in the region, especially heavy metals, should be continuously evaluated and monitored.