The potential effects of water-soluble aromatic hydrocarbons contained in refined and crude oil on aquatic organims have increased in recent years. Thus, the incidence of accidental oil spills from vessels, drilling operation, terminals, and especially refinery and petrochemical effluents have been threatened marine life with the hydrocarbons pollution of bays and estuaries (Baker 1971a; Moulder and Varley 1971; Brocksen and Bailey 1973; Anderson et al. 1974; Clark and Macheod 1977b). Baker (1971a) has suggested the importance to study the biological effects of oil industrial effluents, because the area near an effluent is subjected to continuous but low concentrations of oil and other compounds for a long time.