Growth and quality performances of seaweed (Kappaphycus alvarezii) with different combinations of temperature and light parameters

Abstract

This study aimed to analyze the optimal combination of temperature and light for the growth and quality of Kappaphycus alvarezii seaweed. This study used a factorial completely randomized design (CRD factorial) consisting of 2 factors (temperature and light) with three replications, which included a combination of temperature 28, 31, and 34 °C with light 50 and 100 photons (µmol m−2 s−1). The test object used was a seaweed seed weighing 50 g. The results showed that the S28C100 treatment gave the highest absolute weight growth value (P<0.05). The highest specific growth rate (SGR) was found in the S28C100 and S31C100 treatments, not significantly different between the two, respectively 3.77±0.058% and 3.03±0.12%. Treatment S31C50 followed by S31C100 gave the highest value for the carrageenan yield, but there was no significant difference between the two, respectively 15.505±0.71% and 13.965±0.26%. The combination of temperature and light in this study resulted in gel strength values of 922.150±234.26 to 1048.555±266.46 g.cm−2 but not significantly different between each treatment.