Effect of difference of Photopriode in culture chlorella sp. with the continuous fotobioreactor system

Research on the effects of differences in cultures of Chlorella sp fotopriode. with a continuous photobioreactor system. .This research was conducted in April 2019 at the laboratory of Fish Hatchery and Breeding University of Riau. The purpose of this study was to find out the right photoperiod in Clorella sp. culture by using a blue LED light with a continuousphotobioreactor systemto population density and specific growth rates.The method used is the experimental methodby using a completely randomized designwith four treatments and 3 repetitions.The treatment used is P1 (24 hours bright - 0 hours without lighting), P2 (20 hours bright - 04 hours without lighting), P3 (16 hours bright - 08 hours without lighting), P3 (12 hours bright - 12 hours without lighting). The results of the study found that lighting 16 hours bright - 08 hours without lighting) give the best results with a cell density of 336.67 x 104 cells / ml and the specific growth rate of 0.341 / day d with peak growth occurring on day 8.