Abstract
The concentrations of iron, copper, zinc, chromium, arsenic, cadmium and lead were determined by inductively coupled plasma mass spectrometer (ICP-MS) in the muscle, gill, brain and liver tissues of lessepsian fish species sampled from Taşucu region located on the south of Turkish coastal waters in the Mediterranean Sea for all seasons. While iron showed the highest levels, cadmium showed the lowest levels in the examined tissues of all fish species (Pelates quadrilineatus, Upeneus moluccensis, Nemipterus randalli, Saurida lessepsianus). Metal levels showed tissue-dependent changes in the species studied. Cadmium was detected only in the liver tissue in all fish, in addition to a few other tissues (U. moluccensis’s brain tissues in summer season and P. quadrilineatus’s gill tissues in winter season). The maximum accumulation of Fe except for N. randalli and S. lessepsianus was detected in liver tissue. The maximum accumulation of Cu in all species was detected in liver tissue. The maximum accumulation of Zn except for S. lessepsianus was also detected in liver tissue. The highest accumulations of As and Cr in other fish species except for N. randalli were also detected in liver tissue. Except for As accumulation in N. randalli, the least accumulation for metals in all species was determined in muscle tissue. According to the seasons, there was no statistically significant relation between metal accumulations. Metal concentrations in edible parts of fish species were 17.26-108.22 µg g-1 dw for iron, 0.54-3.65 µg g-1 dw for copper, 11.50-31.17 µg g-1 dw for zinc, 0.32-1.09 µg g-1 dw for chromium, 4.32-69.44 µg g-1 dw for arsenic, below limit (not detectable) for cadmium, N.D.-1.12 µg g-1 dw for lead. In this study, for all metals except arsenic there is no health risk through an exposure of consumption of certain fish. Additionally, the results obtained for the elements in analyzed fish species were within acceptable limits for human consumption.
Highlights
Please cite this paper as follows: Karaytuğ, S., Şen Ağılkaya, G., Ayas, D. (2018)
The aim of this study is to reveal the seasonal changes in the levels of metal accumulation in the tissues of some important Lessepsian fish species; N. randalli (Russell, 1986), S. lessepsianus (Russell, 2015), U. moluccensis (Bleeker, 1885), P. quadrilineatus (Blotch, 1790) in the Northeast Mediterranean Sea
Moluccensis is in muscle tissue in spring season (41.64 μg g-1 dw), the highest Fe accumulation is in liver tissue in autumn season (1912.31 μg g-1 dw)
Summary
Please cite this paper as follows: Karaytuğ, S., Şen Ağılkaya, G., Ayas, D. (2018). The effects of season on the metal levels of tissues of some lessepsian species caught from the Northeastern Mediterranean Sea. Besides being an important protein source, fish has rich nutritional content such as basic minerals, Karaytuğ et al (2018) Marine Science and Technology Bulletin 7(1): 33-42 vitamins and unsaturated fatty acids (Medeiros et al, 2012). The American Heart Association recommended eating fish at least twice per week in order to reach the daily intake of omega-3 fatty acids (Kris-Etherton et al, 2002). Despite their known benefits, fish are susceptible to metal contamination and when the metal accumulation in the food chain is taken into consideration, fish species can become a serious risk for human health, especially the most consumable fish species (Castro-Gonzalez et al, 2008). Mersin Bay, which is located in the Eastern Mediterranean coast of Turkey, has high potential for pollution due to heavily used in agricultural activities fertilizers and pesticides, domestic waste in the region, wastes from the chrome, plastics, fertilizers, glass and port industries (Kalay et al, 2004) and due to the increased population (Karayakar et al, 2010)
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