تلخیص
Altogether nine species of algae belonging to five genera, three families, two orders, one class and one phylum (division) were collected from Manora, Karachi. The blue-green algal species have been found growing on the backwaters of Manora. High tidal water floods the Mangrove area that brings up abundant amount of nutrients enriching sub littoral regions for the growth of phytoplankton and blue-green algae, which include members of Chroococcales having two species of Aphanothece and one species Microcystis genera and members of Nostocales having three species of Lyngbya, two species of Oscillatoria and one species of Gloeotrichia genera. These species were systematically investigated and periodically recorded during the year 2017.