Under suboptimal temperature conditions, photosynthetic activity is severely reduced when compared to the optimal conditions (8). Latala (9) reports that in the case of algae grown under very high temperature conditions, the growth is at least partially impaired or even strongly hindered. This means that both low and high temperatures exert an inhibitory effect on algae, which necessitates a maintenance of cultivation temperature at optimal conditions. In particular, Haematococcus cultures are shown to be quite sensitive to temperature changes