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Light microscope footage of Haematococcus sp. algae, showing the biflagellate cells moving in the water column of a bird bath sample. Haematococcus occurs as biflagellate single cells where the protoplast is connected to the wall by multiple, thin strands of cytoplasm. Cell structure and reproduction appear to be similar to those of Chlamydomonas. Mass reproduction often forms conspicuous red to deep-purple growths, based on accumulation of astaxanthin during formation of resting stages. Astaxanthin is commercially valuable as a food colorant and in cosmetic products. In the middle of the clip an Adineta rotifer is crossing the field of view. Microscopic contrast method used : differential interference contrast. Captured field width : 0,5mm