الفهرس 
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Abstract
A total of (831) samples were examined. (475) were examined chemically, (320) bacteriologically and (36) for occurrence of marine toxins. Chemical analyses performed on edible portion of shellfish (235), water of gowing areas (120) and surface bottom sediment of their growing areas (120) for determination of the most important element for public health, Cu, Zn, Cr, Cd, and Pb. Bacteriological examinations were perfonued on shellfish (195) and their growing-waters (125) in various areas for determination of the indicator bacteria to sewage pollution, coliforms, faecal coliforms, and E. coil, and enteric pathogens as Salmonella and ShE gella. Also, determination of the indigenous marine pathogens as V. parahaemolyticus.
The studied shellfish growing areas along the Egyptian coastline on the Mediterranean were eight, Agami (reference zone), Mex, Abu-Kir, Maadiya, Edku, Rosetta, Bunillus, and a Fishfarm. The examined shellfish (qdible portion) samples were Molluscan (Mussels, Donaz Ininculus, or OmEl-Kholoul, Clams buffer-fish, Tapes spp. or Gandoufly); Crustaceans (shrimp, Penaus kerathurus, and Prawn, Macrobracium rosenbergi). Also, water and surface bottom sediments of their growing areas.
(I) Chemical Part:
Shellfish:
The highesit level of copper (Cu) and zinc (Zn) in shellfish of various growing areas were found in OmEl-Kholoul-Rosetta (14.12 .tg gj and Shrimp- Rosetta (20.48 pg gj, respectively with high significant difference at 0.01 level (99% confidence).
The highest level of chromium (Cr) in shellfish of various growing areas were found in OmEl-Kholoul-Rosetta (4.5 pg grn’) with high significant difference at level 0.01 (99% confidence). The second highest level was OmEl-Kholoul-Edku (2.46 pg gj, then Shrimp-Rosetta (2.23 pg gj, then OmEl-Kholoul-Maadiya (1.97 pg gj.
The highest level of cadmium (Cd) in shellfish of various growing areas was found in Gandoufly-Mex (0.58 pg g1) with high significant difference at level 0.01 (99% confidence).
The highest level of lead (Pb) in shellfish of various growing areas was also found in Gandoufly-Mex (11.15 pg