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Toxic metals in the muscle and liver of five main commercially-important fishes from the Persian Gulf, Southern Iran | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Caspian Journal of Environmental Sciences | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
مقاله 8، دوره 16، شماره 2، شهریور 2018، صفحه 191-198 اصل مقاله (631.23 K) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
نوع مقاله: Research Paper | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
شناسه دیجیتال (DOI): 10.22124/cjes.2018.2960 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
نویسندگان | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
M Hosseini1؛ M Naderi2؛ S Gholami3؛ M Hadipour2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1Department of Environmental Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
2Department of Environmental Sciences, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3Ports and Maritime Organization, General Authority of Hormozgan, Shahid Rajaei Port, Technical and Maintenance Unit, Bandar-e- Abbas, Iran | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
چکیده | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The purpose of this study was to determine and compare the concentrations of six toxic metals (Cd, Pb, Fe, Cu, Zn, Mn) in the muscle and hepatic tissues of five commercially important fish species including narrow-barred Spanish mackerel, Scomberomorus commerson, Black pomfret, Parastromateus niger, Silver pomfret, Pampus argenteus, blackspot snapper, Lutjanus fulviflammus and Tigertooth croaker, Otolithes ruber, since they are very common in the household fish consumption. The fish samples were collected from three main landing areas along Bushehr and Hormozgan provinces during spring 2017. Our results indicated that lead concentration was higher than those of other measured heavy metals in all examined fish species, while it was an inverse situation for cadmium. We found that the concentration of the measured metals totally were higher in the liver than in muscle of all the examined fish. There was no significant intra-specific variation in metal concentration among the fish from the same species. Since it is very important to the consumer to choose between the species, we also detected the mean values of the metal concentration in the muscle of the relatively same aged species, sampled from same stations. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
کلیدواژهها | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Biomagnification؛ Commercial fishes؛ Heavy metals؛ Iran؛ Persian Gulf | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
اصل مقاله | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
[Research]
Toxic metals in the muscle and liver of five main commercially-important fishes from the Persian Gulf, Southern Iran
Hosseini M.1, Naderi M.*2, Gholami S.3, Hadipour M.2
1. Department of Environmental Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran 2. Department of Environmental Sciences, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran 3. Ports and Maritime Organization, General Authority of Hormozgan, Shahid Rajaei Port, Technical and Maintenance Unit, Bandar-e- Abbas, Iran
* Corresponding author’s E-mail: ghnadery@yahoo.com (Received: Nov. 28. 2017 Accepted: May 14. 2018) ABSTRACT The purpose of this study was to determine and compare the concentrations of six toxic metals (Cd, Pb, Fe, Cu, Zn, Mn) in the muscle and hepatic tissues of five commercially important fish species including narrow-barred Spanish mackerel, Scomberomorus commerson, Black pomfret, Parastromateus niger, Silver pomfret, Pampus argenteus, blackspot snapper, Lutjanus fulviflammus and Tigertooth croaker, Otolithes ruber, since they are very common in the household fish consumption. The fish samples were collected from three main landing areas along Bushehr and Hormozgan provinces during spring 2017. Our results indicated that lead concentration was higher than those of other measured heavy metals in all examined fish species, while it was an inverse situation for cadmium. We found that the concentration of the measured metals totally were higher in the liver than in muscle of all the examined fish. There was no significant intra-specific variation in metal concentration among the fish from the same species. Since it is very important to the consumer to choose between the species, we also detected the mean values of the metal concentration in the muscle of the relatively same aged species, sampled from same stations.
Key words: Biomagnification, Commercial fishes, Heavy metals, Iran, Persian Gulf.
INTRODUCTION Fish as a valuable source of protein, constitute essential minerals, vitamins, and different kind of fatty acids (Medeiros et al. 2012). Many health care institutes advise pregnant females to consume fish at least twice per week to get omega-3 fatty acids (Kris-Etherton et al. 2002). While the consumption of the fish is very important, there is global concerns regarding the effect of the marine pollution on the food safety (Yilmaz et al. 2007; Zhao et al. 2012). Accumulation of such toxic metals in fish biomass is related to different species-specific characteristics (such as age, body length, sex, feeding habits, ecological requirements) and water biochemical characteristics (such as salinity, pH, temperature, hardness) (Demirak et al. 2006, Al-Busaidi et al. 2011; Rahman et al. 2012). Concentration of such toxic heavy metals in edible parts of fish and their potential side effects have been extensively investigated (Yilmaz et al. 2007, Elnabris et al. 2013). It is acknowledged that such accumulated heavy metals have many adverse health effects (Abou-Elnage et al. 2005; Farkas et al. 2002; Yilmaz et al. 2007). For instance, high level of lead content causes health problems in the nervous system, kidneys, anemia and sexual disability (Kim et al. 2015). Marine pollution and accumulation of heavy metals along the food chain brings about serious impacts such as growth demolition, behavior, and genetic abnormalities in fishes (Amini Ranjabar & Sotodehnia 2005, Naghipour et al. 2016). We selected five of the most common fish species in the household-food basket to determine which species are more safe to be consumed based on the amount of nominated heavy metals accumulated in their edible parts. Regarding the selected species, there is some previously- published literature. Sadeghi et al. (2011) reported that the concentration of Pb, Cd, and Ni in the edible parts of P. niger is lower than EPA, UK, and WHO food safety standards. The same results were also obtained by Abarshi et al. (2017) for T. croaker. Khazaei et al. (2013) found that Pb, Ni, and Cd contents were higher than the WHO safety standards for O. rubber and P. argenteus. Some investigations showed that these metals can be deposited and magnified in the sediment and aquatic biomass (Linnik & Zubenko 2000) and reach a harmful level in the upper trophic levels (Abarshi et al. 2017). Comparing the amount of heavy metals accumulated in muscle tissue of different fish species showed that the accumulation of heavy metals in pelagic species was lower than that in carnivorous benthic species (Romeo et al. 1999, Shahab Moghadam et al. 2010). In this study, the heavy metal contents of the edible tissue parts and important accumulating organs including hepatic tissue were investigated in five commercial fish from landing areas of Bandar-e-Abbas harbor, the Persian Gulf, and compared against the globally recommended maximum permissible limit.
MATERIAL AND METHODS We obtained a total of 30 specimens from each species (totally 150 specimens) purchased from a fisherman who caught the specimens from landing ports along Bushehr and Hormozgan provinces (the Persian Gulf) (Fig. 1). All specimens were weighted and transferred in a cool box to the laboratory and then frozen at (-20 C°) for dissection (Turkmen et al. 2012). Before defrosting, the morphometric characteristics such as total length and caudal fin lengths were recorded to the nearest 0.1 mm. The hepatic and muscle tissues were frozen after dissecting at −18◦C. After defrosting in the laboratory, each sample was weighed to the nearest 0.001 g, put onto petri dishes, and placed in the dryer at 80◦C. After obtaining the stable weight, the samples were digested in 2 mL of 65% nitric acid and the entire solution was diluted to 10 mL with deionized water. The prepared samples were then analyzed with the flame atomic absorption spectrometer. The final results were presented as concentrations in μg g-1 of the dry weight. The normal distribution of the data was checked with Kolmogorov-Smirnov test. T test was used to investigate mean difference of the heavy metals. Spearman rank correlation coefficient analysis was applied to test the significant relationships between heavy metal concentrations in different organs of each group. One-Way ANOVA was used to compare the significant differences in heavy metal concentrations among fish species and localities. Linear regression analysis was used to determine the intraspecific relationship between heavy metal contents and the specimens'weight.
Fig.1. Specimens collection points along the Persian Gulf, Iran.
RESULTS Our results indicated that the mean concentration of all heavy metals was significantly higher in Asalouieh landing area in comparison with the two other sites. The lowest amount of the heavy metals examined was recorded in muscle tissue, while all fish species showed the highest amount of heavy metals in the hepatic tissue as an accumulating organ. Regarding the inter-specific variation, there were no significant differences in heavy metal accumulation in all fish species, while ANOVA test showed some significant differences among the same species collected from different localities. The highest amount of lead was recorded in the hepatic tissue of S. ommerson, while O. ruber showed the lowest amount in its hepatic tissue. The concentration of Pb in its muscle ranged from 0.25 (± 0.07) ug g-1 dry weight, while the highest amount, i.e. 16.25 (± 3.50) ug g-1 dry weight was found in L. fulviflammus. Cadmium showed a relatively wide range from0.73 (± 0.28) in L. fulviflammus liver to the highest concentration of 5.51(±1.90) ug g-1 in P. niger liver. The maximum concentration of Cd was detected in the liver of P. niger collected from Asalouieh (5.51 ± 1.90). Pb was concentrated in the Black pomfert liver, while the lowest amount was recorded in S. commerson. Examining muscle tissues also confirmed that the highest amount of Pb was detected in S. commerson, whereas the lowest value in tigertooth croaker (Table 1).
Table 1. Mean (±SD) concentrations of heavy metals in muscle and liver tissue of collected specimens from Bushehr.
Comparing the mean value of the measured heavy metals among different species indicated that the mean concentration of Cd and Mn were significantly higher in L. fulviflammusmusclethan in otherspecies(P < 0.001), while the concentration of Pb showed the reverse situation (P < 0.001) (Tables 2-3). The mean Fe concentration was higher in P.argenteusmuscle compared to the other species. The highest Pb concentration was recorded in P. niger liver specimens. Linear regression analysis showed that there was a significant relation between Cd content and P. niger weight(t = 6.68, R2 = 0.69). Lower regression coefficient for other species showed that there was no significant and considerable relation between other metal concentrations and species mean weight. Our results based on One-Way ANOVA test showed that there was a significant difference among fish species concerning to the heavy metal concentrations (F = 78.11, P < 0.05).
Table 2. Mean (± SD) concentrations of heavy metals in muscle and liver tissue of collected specimens from Asalouieh.
Table 3. Mean (±SD) concentrations of heavy metals in muscle and liver of collected specimens from Bandar-e-Abbas.
One-Way analysis of variance also showed that there was a significant difference in Cd concentration among the fish species examined (F = 12.52, P < 0.05). L. fulviflammus from Asalouieh area showed the highest Cd concentration in its muscle. The mean metal concentrations in muscle of the fish species were found to be as the following order for each locality (Table 4). Comparing our results with globally-accepted standards showed that the amount of Pb was higher than that in Asalouieh. It was also true for Cd in P. niger, P. argenteus, and L. fulviflammus.
Table 4. Heavy metals ranking sequences in different collection points.
DISCUSSION We investigated heavy metal concentrations in edible parts (muscle) and liver tissues of five commercially important fish species in southern part of Iran along the Persian Gulf coast and compared some potentially polluted areas with other non-polluted parts. Although such edible parts of fishes can not be regarded as the target organ to accumulate such metals, but it is important to elucidate its effect on human health (Bahnasawy et al. 2009). Abel et al. (1989) clarified that heavy metals threatened not only fishes but also humans. The metal concentrations measured reflected a clear influence of anthropogenic activities, since the highest amount of all the heavy metals was measured in fishes collected from Asalouieh where it is located near oil refinery facilities. The concentration of the heavy metals measured was higher than the standard levels recommended for this area. Additionally, the effective exposure of organisms to different metals may be influenced by either changes in metal speciation or relative distribution of metals among particles of different sizes and densities (Turkmen et al. 2012). However, muscles cannot accumulate heavy metals (Elnabris et al. 2013), but in polluted areas the concentration of such metals in muscle tissues may exceed the accepted standard levels for human consumption. Comparing the recorded heavy metal concentration with the maximum permissible levels (Sahebi et al. 2011) for human consumption (MPL) established by different organizations (Table 6) showed that all fishes
from Asalouieh area were unsafe for human consumption. Metals such as Cu, Zn, Fe, and Mn were clearly below all the permissible limits for human consumption. Such metals are essential for metabolism in human bodies. Other investigated metals such as Pb and Cd, which are the non-essentials, are higher than all the permissible limits especially for Asalouieh fishing harbor, but they are below the limits in Bandar-e-Abbas and Bushehr fishing harbors compared to all the standard levels. Our results indicated that the amount of the metals accumulated in liver was higher than that in the muscle for all the specimens examined. Chen & Chen (2001) found that the muscles of Sardinella lemuru recorded the highest concentrations of Zn, Fe, Cu, and Mn among nine fish species collected from the Ann-Ping coastal waters, Taiwan. It was reported that larger fish biomass accumulated more heavy metals like Cd in its liver (e.g. Caranx sp.) that can be related to the age of the fish, since Cd is difficult to be excreted from liver once it is accumulated (Khaled 2004). This large fish might have accumulated high Cd concentrations throughout its long life. Eisler (2010) also reported that the accumulation of cadmium in liver was positively linked to the age of the fish. In the present study, we found that S. commerson showed higher Cd accumulation in its hepatic tissue that is in accordance with the previous literature. Our results indicated that S. commerson accumulated more Cd and Pb than other species corresponding to its mean weight and size compared to the other fish species. Our results regarding the concentration of Cd and Pb are in agreement with this order, but there is no regular pattern concerning the essential metals including Mn, Zn and Fe.
Table 5. ANOVA analysis of mean differences between three groups (locality, species and organs).
Table 6. Maximum permissible levels for human consumption from different organizations.
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