Abstract:The impact of light intensity on growth and biomass of Gracilaria chouae were studied under laboratory conditions. It was found that G.chouae could not keep long term growth at a low light intensity (40 μmol/m2•s). In a short time (<7 d), G.chouae achieved the rapidest grow that 80~120 μmol/m2•s, and the content of photosynthetic pigment was greater than the other treatments. In a longer period (14~28 d), the relative growth rate and the content of photosynthetic pigment of G.chouae increased with higher light intensities.Their dry weight reached the peak at 200 μmol/m2•s. The highest photosynthetic rate and respiration rate of G.chouae were obtained at 0.40±0.12 μmol O2/g•s, and 0.07±0.03 μmol O2/g•s respectively.The light saturation and compensation points of G.chouae were 200±60 μmol/m2•s and 35±15 μmol/m2•s, respectively.
