The total Hg of 6 marine fish species, caught from the 3 main fishing grounds along the coast of Alexandria, was determined and the distribution among the different organs was studied. It was found that the total Hg levels in fish differed according to species, size, and organs of fish as well as fishing ground. The highest value was found in large size especially in the viscera of Mullus barbatus obtained from El-Mex fishing ground.