Kappaphycus alvarezii was cultivated at three places, viz. Mithapur, Okha and Beyt Dwarka on the Northwest coast of India. The biomass and growth rates were measured at 15-day intervals up to 45 days and varied di¡erently for di¡erent growth periods at these places. Thus, at 15, 30 and 45 days, the biomass (fresh wt) varied from 182.0 AE 19.96 to 435.0 AE 23.66 g, from 366.0 AE 118.09 to 1096.0 AE 61.43 g and from 530.5 AE 50.95 to 1537.0 AE 43.54 g, respectively, with respective daily growth rates (%) from 3.95 AE 0.78 to 9.80 AE 0.63, from 3.64 AE 0.01 to 13.98 AE 3.07 and from 3.69 AE 0.23 to 6.07 AE 0.06. The seawater temperature, salinity, nitrate and phosphate ranged from 19.3 to 26.9 1C, from 30.81 to 36.83%, from 11.60 to 19.75 mmol L À 1 and from 2.37 to 5.0 mmol L À 1 respectively. The growth rate between the culture months was signi¢cantly di¡erent at Okha at Po0.01. Further, it was signi¢cantly correlated to salinity at Mithapur while at Okha and Beyt Dwarka, the same was signi¢cantly correlated to nitrate and seawater temperature. Based on this study, commercial cultivation at these localities is quite feasible.