On the Growth and Survival of Ulva fasciata in the Polluted Waters of Visakhapatnam Harbour

Abstract

Experiments were conducted to assess the effects of polluted seawater of the Visakhapatnam Harbour o n the growth and survival of Ulva fasciata Delile. Rapid degeneration of ülva discs with marked reduction in growth was observed in the waters collected near Southern lighter canal which are polluted by untreated town sewage. In the waters of Northern and Western arrns of the Harbour, growth rate was slightly more than that observed in unpolluted seawater used äs control, but 22 to 30 per cent of Ulva discs died at end of the experiments. Results of these experiments indicate that the waters of Visakhapatnam Harbour are toxic to the growth of Ulva fasciata and waters of Southern lighter canal are more polluted than the waters of Northern and Western arms.

SUMMER DECLINE OF ULVA LACTUCA (CHLOROPHYTA) IN A EUTROPHIC EMBAYMENT: INTERACTIVE EFFECTS OF TEMPERATURE AND NITROGEN AVAILABILITY?1

“…around a sewer outfall along the coastline of Sydney, South Wales. However, Sreeramulu et al (1977) documented rapid degeneration of Ulva fasciata with marked reduction in growth rates associated with untreated town sewage. Similar findings on the negative effect of N enrichment on Ulva spp.…”

Effect of Domestic Sewage and Industrial Effluents on Biomass and Species Diversity of Seaweeds

“…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.…”