I am studying on Haematococcus pluvialis mutagenesis, I have succeeded to develop some well growth mutagenic starins after UV-C exposure. However, these strains do not show the same growth performance in all the culturing repeats. I have realized that there is some algal aggregation formation under steromicroscope, and suspected if there is an fungal contamination that effects their growth rate. I have attached an image that show the aggregation spots.
Thank you in advance