بررسي تاثير زمان و دماي انجماد در تغييرات ميزان تجمع فلزات سنگين در دوگونه ميگو

This study is focussed on evaluation of temperature effect during frozen storage on movement of trace elements in different tissues (exoskeleton. carapace and abdominal muscle) of two commercially important shrimp species {Penaeus merguiensis and Metapenaeus affinis), Moreover relationships between total length and sex of specimens with concentration of trace elements in selected tissues were assessed. Concentrations of Cd. Cr, Cu Fe. Mn, Ni and Zn in samples were determined by ICP-AES. Only in the case of Ni and Zn sex related differences could be observed. With the exception of Cu. the tracemetals distributed significantly different between the tissues. The only significant differences between species were found in bioaccumulation of Mn. Size dependent relationship was observed only for Ni. Associatons between Mn and Fe were positively and highly significant in all the cases. The levels of ali the metals in muscle of the shrimps from studied region were comparable to other world areas. Mean Cu and Zn levels in edible parts of M. affinis slored at - 10° c exceeded some existing guidelines, while the concentrations at - 30c were Samewhat lower hatlower than them.