Abstract:

The Coastal water of Mumbai in the west coast of India is well known for its diverse fishery resources. This locality is at present under stress due to treated and untreated urban wastewater discharge through storm water drains. The present study deals with the species of Dinophysis group present in the tidal channel of Manori creek and the various environmental parameters, which influence their presence. A total of five species of Dinophysis i.e. Dinophysis caudata, D. norvegica, D. dens, D.acuminata and D.miles were recorded during the one and a half years of study from July 2005 - December 2006. These groups were present below 100 cells L-1 and constituted a very minor fraction of the total phytoplankton community. They were sporadically present during the monsoon months when salinity was low. In the study the environmental parameters, trace metals (Fe, Cu, Co, Mo, Zn, Ni and Cd), pH, atmospheric temperature, NH3 - N, NO3 – N, NO2-N, PO4-P and dissolve oxygen were not found to be influencing the Dinophysis presence. It was only correlated with low salinity. The result also indicated the eutrophic condition of this creek caused by anthropogenic activities. This is the first detailed study of Dinophysis species in correlation to their environmental parameters from this region.

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Date 2010/12/15

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