Cultivation of red seaweed Kappaphycus alvarezii using the inverted pyramid method (IP) was carried out in the waters of Booi village, Saparua bay at the Central of Maluku regency. The effectiveness of the IP method can be compared with the conventional, longline (LL) method based on growth rate, biomass production and carrageenan yield. The IP method is operated on the surface layer of the deep waters to a depth of 10 meters, while the LL method is only operated in shallow waters at a depth of less than 10 meters. The results showed that growth and production of biomass with the IP method tended to decrease according to increasing depth, while the carrageenan yield increased. However, the carrageenan yield with the LL method increased in line with growth and production of biomass. It is seen that seaweed cultivation with the IP method is more effective than the LL method in terms of land area used, in addition to biomass production and the yield of carrageenan gained.