الفهرس 
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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).