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The effect of two chlor-alkali industry effluents and domestic sewage has been studied, in situ, on tropical seaweeds of the Okhamandal coast. Maximum biomass was observed at a distance of 400 and 5000 m away from the discharge points of the two chlor-alkali industries. Ulva lactuca and Rhizoclonium kochianum were most resistant while Caulerpa scalpelliformis, Halimeda tuna and Codium dwarkense were most sensitive. Species of Sargassum, Cystoseira and Gelidiella were completely eradicated due to the long term effect of the effluent from one chlor-alkali industry. Gracilaria corticata, G.foliifera and species of Hypnea produced good biomass under mildly polluted conditions and they may be cultivated in such areas. Algal species diversity (ASD) was not recorded up to 400 and 4000 m away from chlor-alkali industries outfalls as intensity of pollution was high in this region. The ASD increased as the distance from the outfall increased. In general, brown seaweeds were most sensitive to this type of pollution.Domestic sewage was much less inhibitory to seaweeds. Species of Ulva and Enteromorpha were maximum biomass producers while brown seaweeds were least productive in the near vicinity of the discharge. Species diversity was also high, in this area, as compared to the chlor-alkali industry effluents.Vertical distribution of seaweeds was not evident up to 400-4000 m away from chlor-alkali effluents outfall and up to 10m away from domestic sewage discharge points. Seaweeds showed characteristic vertical distribution after these distances. n ro uc on sewage and industrial effluents on Indian seaweed has Domestic sewage and industrial effluents affect the been published (Subbaramaiah and Parekh 1966, Tegrowth of seaweeds. The response ranges from stim-wari 1972, Sreeramulu et al. 1977, Umamaheswara ulation through indifference to total devastation. Spe-Rao 1977, Joshi et al. 1982, Tewari and Rao 1982, cies may respond uniformly or in diametrically op-Dhargalkar 1986. These studies were confined mostly posite ways (North et al 1972). The effect of such to the laboratory with analytical studies on selected complex effluents on temperate marine algae have species of seaweeds. The present study was underbeen studied in different parts of the world (Golubic taken to find out the effect of such complex wastes 1968, Borowitzka 1972, Littler and Murray 1975, Niel on tropical Indian seaweeds in situ.