Concentrated microalgae, unicellular flagellate species from the freshwater/brackish environments belonging to the genus Haematococcus. Medium-sized algae (5-25 microns), lipid and carbohydrate-rich, with high antioxidants, carotenoids and astaxanthin contents. Suitable as a dietary supplement for crustacean larvae and post larvae, for rotifer enrichment in the larval culture of fish, as colourant and natural immunostimulant in ornamental