2022 Volume 76 Issue 1 Pages 50-54
High growth conditions for sterile Ulva, green algae, were evaluated for an efficient culture. A culture device simulating the sea was prepared, and the maximum conditions for a specific growth rate was verified using the photosynthetic photon flux density （PPFD） of the bottom of the culture tank as an index instead of the Leaf Area Index （LAI）. As a result, the specific growth rate showed the highest value at the average PPFD of 20.6 µmol m－2 s－1 for one week on the bottom of the culture tank, and the specific growth rate decreased significantly at 4.0 µmol m－2 s－1. From these data, a method for controlling the density of sterile Ulva using the PPFD of the bottom surface as an index will lead to a culture control method that can maintain a high growth rate for sterile Ulva without the complicated LAI measurement. Based on these data, we newly proposed a type of efficient sterile Ulva production using enriched seawater.
