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Abstract The present study was undertaken on two catch seasons (1996 and 1997) in the periods from April to September of each year. Samples of water, sediment, shrimp, and crab were collected from two locations, mainly Ras EI-Bar (Mediterranean Sea) and EI-Boghdady bridge (entrance of EI-Manzalah Lake). Shrimp and crab samples were sexed and measured for the exteral body length and width. The edible parts (flesh) were separated from the shrimp and crab samples. The by-products (wastes) of the shrimp samples were kept also for elements (As, Cd, Pb, Hg, Se, and Sr) determination in all collected samples, after the preservation and preparation to be measured by an atomic absorption spectrophotometer. The apparatus used was measured for its recovery of these elements which was ca. 100%. All data collected were statistically analysed. The obtained results could be summarized as follows: Firstly : Arsenic and selenium were not detectable in all samples of the water, sediment, shrimp (flesh and wastes), nor crab flesh, although the sensitivity and precision of the apparatus. That mean that both elements level in all samples tested was lower than the lowest detection limit (0.001 ppm). |