2002 Volume 68 Issue sup1 Pages 489-492
Changes in some chemical components of Chattonella antiqua (Hada) Ono (Raphidophyceae), Alexandrium catenella (Whedon et Kofoid) Balech and Scrippsiella trochoidea (Stein) Loeblich III (Dinophyceae) during their asexual growth under laboratory conditions were examined. The energy charge (EC) value of these phytoflagellates was also calculated. The changes in cellular contents of ATP, carbon, nitrogen, phosphorus, and amino acids showed generally same pattern. They were markedly increased during late lag phase and early exponential phase of growth. After mid exponential phase, these biochemical components decreased and became approximately constant from late exponential phase to the end of experiment. The EC value of A. catenella and S. trochoidea rapidly increased after the inoculation, thereafter, it decreased and became approximately constant during stationary phase. These occurrences indicated that these phytoflagellates could increase their metabolic activities after the inoculation into the new culture medium within a few days.