Ảnh hưởng của môi trường dinh dưỡng và chu kỳ chiếu sáng đến sự phát triển của tảo Chaetoceros calcitrans

Abstract

The study aimed to determine the influence of nutrient medium and light cycle on the growth of algae Chaetoceros calcitrans. Research results have shown that in 3 nutrient media F/2, Walne, TT3, Chaetoceros calcitrans grown in Walne medium reached the highest density on the 9th day of culture (279.16 ± 1.55 x 10⁴ cells/mL), with a longer equilibrium phase. Algae cultured in F/2 and TT3 medium reached the maximum density on the same day 9 but the density was lower and at the densities of 253.75 ± 0.42 x104 cells/mL and 238.57 ± 0.65 x10⁴ cells/mL, respectively. Experiments on algae culture at 4 different lighting cycles 12/24 hours, 16/24 hours, 20/24 hours and 24/24 hours showed that the algae Chaetoceros calcitrans cultured in the 24/24 hours light cycle reached the highest density and at the earliest on the 7th day of rearing (290.76 ± 0.76 x 10⁴ cells/mL). Meanwhile, algae were cultured in 12/24 hours, 16/24 hours and 20/24 hours light cycles together reached all reached their maximum density 1 day later with a density of 253.76 ± 0.85 x 10⁴ cells/mL, 223.16 ± 0.57 x 10⁴ cells/mL and 209.17 ± 0.43 x 10⁴ cells/mL. The research results showed that the algae Chaetoceros calcitrans grew best in Walne medium with a light cycle of 24/24 hours.