A total of 29 genera belonging to 24 families of aquatic macrophytes were recorded. Among these, 25 species were recorded from the freshwater aquatic ecosystems, 4 species from both the shrimp culture ponds and freshwater aquatic ecosystems and only one from the shrimp culture ponds. The physicochemical conditions of both the habitats indicate that very poor number of macrophytes can grow in the shrimp culture ponds due to high salinity of water and soil. Low population and abundance indicate that the macrophytes are in alarming condition in Koyra due to increasing salinity.
Neurymenia fraxinifolia (Mert.) J. Ag. a marine red alga has been described and illustrated for the first time from St. Martin's Island, Bangladesh.The algal sample was collected during low tide attached to inside black rocky hole in the northern side of 'Boroshiler Bandh' area of west coast of St. Martin's Island, Bangladesh on 14 February, 2006. The alga has been identified as Neurymenia fraxinifolia (Mert.) J. Ag. (Srinivasan 1969). The samples of N. fraxinifolia were preserved in 5% formalin in the sea water and kept in Environmental Science Discipline, Khulna University, Khulna -9208, Bangladesh.Islam (1976) described 49 taxa of marine red algae under 35 genera from Bangladesh. Later on more marine red algae from this island were reported (Aziz (1997, Aziz et al. (2002a, 2002b, Islam and Aziz 1982, 1987, Islam et al. 2002. N. fraxinifolia (Mert.) J. Ag. is being reported here for the first time from Bangladesh.Detailed description and illustrations are given on the basis of fresh and preserved materials.
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