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The results of mentioned physicochemical and biological analysis show that inmore polluted sampling points, the number of resistance benthos (Bivalves) aremore than other points of the study area. Heavy metal concentration in sedimentis between 10 to 1000 times more than water samples especially for Arsenic,Mercury, and Vanadium. Dissolved Oxygen is acceptable all over the study area(more than 4 mg/L) based on environmental quality standards for dissolvedoxygen which present the range of 2-9 mg/l for sensitive aquatic lives to lesssensitive ones. However the presence of chemicals causes increase in the valueof Chemical Oxygen Demand (around 500 to 1000 mg/L) and consequent decrease inwater purification ability Nutrient uptake capacity which shown as the ratio ofNitrogen to phosphorus is appropriate (around 6) in parts of Musa estuary withmore than 3 meters depth . The study area is a semi-closed tide-dominant waterbody with shallow depth, in comparison to the oceans. A 2-D modelling isapplied to simulate current speed and direction. The results of this modellingshows except in the creeks, we have relatively suitable circulation of water inthe estuary and current speed may exceed 0.8 m/s. It means Musa estuary is nota dead zone and in some parts which have enough water circulation and nutrientuptake for aquatic life, but huge amount of heavy metal (especially Mercury) inthe sediment and water samples, indicates that all aquatic bodies overwhelmedby dangerous heavy metals.

An exploratory view of water quality and sediment characteristics in Musa Estuary, the Persian Gulf