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Abstract:The culture of a red seaweed Hypnea sp. in three locations of Cox's Bazar coast, Saint Martin Island, Inani and Bakkhali with net method of 4 × 4 m coir rope net was evaluated. Seaweed was partially harvested at 15 days interval during December 2015 to January 2016. Daily growth rate of cultured Hypnea sp. was significantly higher (3.21 ± 0.01% day -1 ) in Saint Martin while Inani had the lowest (0.41 ± 0.06% day -1 ). Biomass yield of Hypnea sp. (3.81 ± 0.04 kg fresh wt.m −2 ) gained highest in Saint Martin than in Bakkhali (3.34 ± 0.10) and Inani (2.70 ± 0.02). Growth rate of seaweeds had a significant correlation with NO3-N (p < 0.05) but not with PO4-P. Culture of seaweed along those sites added a new dimension of prospect and possibility of seaweed mariculture in Bangladesh coast.

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The experimental culture of 3 seaweed species, i.e. Hypnea musciformis, Enteromorpha intestinalis and Padina tetrastromatica in three locations of Cox’s Bazar coast, Bangladesh using 4×4 m horizontal coir rope net method were conducted during 2016 to 2018. Results showed that the biomass yield was highest from H. musciformis (30.23±0.40 kg fw m−1) and significantly differ from E. intestinalis (24.50±0.08 kg fw m−1) and P. tetrastromatica (10.18±0.45 kg fw m−1). The Daily Growth Rate (DGR) of H. musciformis (8.88% day−1) was also higher than the DGR of E. intestinalis (6.55% day−1) and P. tetrastromatica (6.74% day−1). Saint Martin’s Island showed higher biomass yield of seaweeds than Bakkhali and Inani due to favourable water quality. In context to physico-chemical parameters of seaweed farming, Cox's Bazar coast is suitable for seaweed cultivation, although more suitable culture areas and longer culture period yet to be identified. The findings of the present study suggest that the cultivation of H. musciformis is viable and coastal people can take up such activities as seasonal income generating activity in coastal water. Bangladesh J. Zool. 49(1): 47-56, 2021