RADJASA, O.K., Laboratory of Tropical Marine Biotechnology, Diponegoro University, Semarang 50241, Indonesia. Department of Marine Science, Faculty of Fisheries and Marine Science, Diponegoro University, St. Prof. H. Soedharto,SH, Tembalang, Semarang 50275, Indonesia. The Ministry of Research and Public Services at Ministry of Research, Technology and Higher Education, Indonesia.