Culture samples (10 ml) were harvested in the early stationary phase and used for
pigment extraction and analysis. For cells incubated with 25% and 30% NaCl, 13 d cultures were harvested. After
filtration, pigments were extracted with 90% (v/v) acetone in water (Hansmann, 1973) and their absorption
spectra were recorded using a Beckman model 25 spectrophotometer.