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Seaweeds are primarily macroscopic, multicellular, and photosynthetic marine algae and mainly grow in the rocky part of the littoral zone of the ocean. From our study, we found about 154 seaweed species are available on our coast, of which 34 belong to green (Chlorophyta), 38 brown (Phaeophyta), and 82 red (Rhodophyta). The Chlorophyta group contributed 22.08%, the Phaeophyta group 24.67%, and the Rhodophyta group 53.25% of all the species. Among them, 26 species are considered economically important based on their availability, abundance, and use. Seaweeds are mainly available in St. Martin Island, Shaporir dip, Inani, Bakkhali, Kutubdia, Patowartek, Pecherdwip, Teknaf, Shaplapur and Moheshkhali in Cox’s Bazar region of Bangladesh. They are generally found on our Cox’s Bazar coast from October to April, but the highest abundance occurs from January to March. However, in the case of mangrove forests, seaweeds are available throughout the year. Additionally, seven species (H. musciformis, Ulva intestinalis, U. lactuca, Caulerpa racemosa, Sargassum oligocystum, S. ilicifolium, and Padina tetrastromatica) are considered commercially cultivable species. Their culture techniques were developed in the long line and net methods at different sites in Cox’s Bazar region. St. Martin Island had the highest biomass production (kg/m2) of seaweed due to its favorable water quality parameters. Additionally, some species have also shown significant weight increases in the case of indoor culture methods. Several value-added seaweed products were developed from dried seaweed powder. Industries based on seaweed can potentially contribute to the socio-economic upliftment of the coastal inhabitants in Cox’s Bazar. Seaweeds could easily be a new item in the country’s limited export basket and significantly contribute to reducing poverty and persistent unemployment.

Cultivation and Product Development Study of Commercially Important Seaweeds in South-Eastern Coast of Bangladesh