Mohammad Gorgij Jaski
Islamic Azad University, Aquaculture Faculty, Bandar Abbass, Iran
Mohammad Gorgij Jaski has completed his MSc. on aquaculture at the age of 28 years from Islamic Azad University, Iran and now he is PhD student in Aquaculture nutrition. He is the head of Shrimp hatchery production named, Sontderaf in Jask, Iran. He has published more than 2 papers in reputed journals and presented more than 3 papers in International Conferences.
The major nutritional interest in Spirulina is due to its high protein content, ease of digestion and a significant content of vitamins, minerals, amino acids and high value pigments, which have applications in health foods, feed and therapeutics industries. In order to provide optimum growth and protein content, S. platensis cells were grown in modified Zarrouk (1966) media culture at different salinity (30, 32 and 35ppt), temperature (20, 23, 26 and 28ºC) and intensity (50, 75 and 90 μmol m-2s-1). The results of the present study clearly showed that the highest alga biomass and growth rate was obtained following culture under the 32 ppt salinity, 26°C temperature, and under a 13h light:11h dark photoperiod regime at a light intensity of 90 μmol m-2s-1 provided by cool white fluorescent tubes (figure 1). Maximum alga biomass and growth rate of S.platensis in a 5 liter Erlenmeyer flask for twelve days reached to 8 gr L−1 and 0.28 day-1, respectively. However, the mean alga biomass of S.platensisin temperature regimes 20, 23, 26 and 28ºC (under salinity of 32 ppt, and 75 μmol m-2s-1 irradiance) were 4.72, 5.15, 7.69 and 7.03 gr L−1, respectively. The results clearly showed that S. platensis successfully cultivated under different physical condition and maximum protein content was produced in the 30 ppt salinity, 28°C temperature, and 75 μmol m-2s-1 irradiance. A two-way ANOVA indicated significant effects of temperature on the growth rate of S. platensis followed by salinity, and then the interaction between temperature and salinity (p<0.05). Based
on the results from the present study, providing suitable media culture and physical condition can be considered as a promising method to S. platensis cultivation for achieving optimal biomass and protein production.
Figure 1: Alga biomass following culture under the 32 ppt salinity