Petroleum hydrocarbons are important pollutants of sea and marine organisms. The origin of hydrocarbons are either biogenic (endogenic) which are synthetised by marine organisms or exogenic due to oil pollution accumulated by marine organisms. The hydrocarbons found in algae were biogenic (Clarck and Blumer 1967;Youngblood et al.1971; Rossi et al. 1978; Youngblood and Blumer 1973) or exogenic (George 1961; Farrington and Tripp 1977; Miranov et al. 1981; Knutzen and Sortland 1982; Peckol et al. 1990). Some characteristics used to distinguish the origin of hydrocarbons in the marine ecosystem were the ratios of pristane (Pr)/phytane (Ph), C 17/Pr, C18/Ph and CPI (Carbon Preferences Index) values (Clarck and Finley 1974; Gearing et al. 1976; Farrington and Tripp 1977) and also the existence of alkenes and aromatic compounds.