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Macrofauna forms the dominant biomass in marine sediment and play an important role in ecosystem processes such as secondary production, nutrient recycling and pollutant metabolism. There are many Oil industries in Suez Gulf, which required great Protection Agency; its control is usually present, Oil considered the most important hydrocarbon contaminant in marine environment (Head et al., 2006). Oil, chemicals and wastes release from Pipelines, due to equipment failure, oil processes, human error or damage. The value of damage depends on where it occurs and how long it remains and impacted environment. Transportation of oil production effect on marine fauna (Dargay and Gately, 2010). Bio monitoring environmental studies used to detect the accumulation of chemicals in marine waters and organisms (Abbes, 2003). Bio monitoring of environment depends on bio indicators species or groups used to determine the presence or absent of contaminants (Chase et al., 2013). Polychaetes show remarkable abundance, species richness and functional diversity in marine benthic communities of both soft and hard bottoms (Musco, 2012). They play key role in ecosystem functioning and in the estimation of diversity and dynamics of benthic communities (Papageorgiou et al., 2006), used as biomarkers due to its capability to accumulate chemicals and hydrocarbons (Mouneyrac et al., 2010, Lucan-Bouché,1999). Assessing environmental health, as a biological criterion for water quality and in biomonitoring studies (Mikac et al., 2011). They important for the stability of ARTICLE INFO ABSTRACT Article History: Received:Nov.5, 2019 Accepted: Nov.28, 2019 Online: Dec. 2019

Polychaetes from Suez Gulf (Gabel El Zeit), Egypt