Distribution and abundance of phytoplankton in Visakhapatnam harbour

251-258Impact of domestic and industrial effluents on the horizontal, vertical and temporal distribution of phytoplankton and nanoplankton communities was studied. Members of Cyanobacteria, Chlorophyceae and Euglenophyceae and resistant species of Bacillariophyceae and Dinophyceae were found in different stations of the harbour. The abundance of both phytoplankton and nanoplankton decreased from surface to 4 or 6 m depth and nanoplankton was not found at 6 m in Visakhapatnam harbour