Nutritional study of some local strain of blue green algae from Saharsa district

Abstract : Three local strains of Blue-green algae were selected for the nutritional study. Growth was observed in different media. Effect of nitrogen source and phosphorus was also observed. Nostoc linckia showed best growth in CHU-10 medium and Anabaena macrospora and Oscillatoria limnosa in BG-11 medium. Best growth of the culture of Oscillatoria limnosa, Nostoc linckia and Anabaena macrospora was seen in the medium supplemented with NaNo₃ followed by NH₄NO₃ and NH₄Cl. Growth was concentration dependent. Linear increase in growth yield with increasing concentration of nitrogen source was observed. Maximum growth of O. limnosa was seen in the medium supplemented with 2.5 mg/l phosphate followed by 0.5 mg/l. Minimum growth was reported at 6.5 mg/l of phosphate. Maximum growth of A. macrospora and N. linckia was recorded at 2.5 mg/l phosphate.