Growth of seaweed Kappaphycus alvarezii co-cultivated with Sargassum plagiophyllum using the long line method

Abstract

Abstract The use of smaller seed weights < 20g has never been done for cultivating S. plagiophyllum. The study of cultivation of both species S. plagiophyllum (SP) and K. alvarezii (KA) simultaneously had never been done previously. This research was conducted in Bungin Permai coastal waters, South Konawe regency. This research aim was to examine the most suitable wet initial weight for better growth (10,15, 20g) on the growth of both species’ seaweed. The collecting data were analyzed by factorial completely randomized design with three replications. Yields were observed every 9,18,27,36,45 days of the growth period. The results showed that S. plagiophyllum had significantly higher different DGR than those of K. alvarezii (P<0.05) during cultivation period. No interaction between species and wet initial weight was found (P>0.05). In addition, the species of seeds influence the DGR. Seed of SP had higher DGR than KA, but the initial wet weight of the seeds only influences at the initial cultivation period (9th day). Broken thallus was found in the 10,15,20g seeds. The percentage of thallus damage in SP tends to be higher than KA. DGR at 10g seed weight of both species was significantly higher than other seed weights (15g and 20g; P<0.05).