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Observation on the productivity parameters in relation to micro algal biodiversity helps to know the population in particular season and spatial. The study investigates in detail the seasonal and spatial variation of microalgae with special emphasis on their interrelationship of chlorophyll concentration. In order to obtain the information on distribution and abundance of Visakhapatnam Coast microalgae for isolation, fortnightly intervals samplings was carried out. Investigation has been made on the microalgae with special reference to the phylum Ochrophyta, Dinophyta, Chlorophyta, Euglenozoa, Haptophyta and Cyanophyta. Abundance of species under different season of pattern was Pre-monsoon>Post monsoon>Monsoon. The data evaluated from this study was used to prepare the checklist for marine microalgal diversity of Visakhapatnam offshore region.

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