Cadmium and lead concentrations in muscles and livers of stellate sturgeon (Acipenser stellatus) from several sampling stations in the southern Caspian Sea
2011
Heydari, S. | Namin, J Imanpour | Muḥammadī, M (Manūchihr) | Rad, F.M.
Concentrations of Pb, Cd were determined in muscles and liver of stellate sturgeon (Acipenser stellatus) from the southern Caspian Sea. Relationships between trace metal concentration and condition factor (CF), age and hepatosomatic index (HSI) were determined. Forty stellate sturgeons were caught by gill nets in winter and spring 2007-2008 at the Guilan and Golestan Provinces catch stations. Total, fork length and weight of all specimens were determined. Cross sections of first ray of pectoral fins were used for age determination. Muscle (250 g) and liver samples were taken and transported to the laboratory in ice packs and kept in −20°C prior to analyses. For analyses, samples were oven dried and digested with HClO₃ and HNO₃ and diluted to 50cc to determine concentrations of Pb, Cd (flame photometry). Based on the mean concentration level of trace metals analyzed in Acipenser stellatus the ranking was as follows: muscle tissue Pb > Cd, liver Pb > Cd. A significant negative correlation (R = −0.3) was observed between concentrations of Pb with condition factor. Metal concentrations were compared to international standards proposed by MAAF, EEC, HCCR, NHMRC. Our study showed that accumulation of heavy metals in sturgeon tissues varied with sample origin and also physiological and biological peculiarities of the fish.
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