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At present, there is intensive attention for using natural materials as sustainable resources for bioactive compounds. An interesting aquatic fern that is extensively studied is “Azolla spp.”. Azolla is a genus of aquatic ferns and smallleafed floating plants, native to the tropics, subtropics, and warm temperate regions of Africa, Asia, and the Americas (Mosha, 2018). It is a floating pteridophyte that is symbiotic with the cyanobacterium Anabaena Azollae (Yang et al., 2020). Azolla species were successfully used as a biofertilizer, animal feed, water purifier, biological herbicide and for concentration of nutrients and heavy metals from flood waters (Selvaraj et al., 2014). Azolla was also shown to be a source of bioactive secondary metabolites such as phenols, tannins, sugar, anthraquinone glycosides and steroids, and also rich in protein, vitamin and minerals (Selvaraj et al., 2013). Concerning Azolla spp. the current study overviewed: classification, distribution and important applications in different fields in many countries and in Egypt in particular. ARTICLE INFO ABSTRACT Article History: Received: Jan. 29, 2021 Accepted: Feb. 15, 2021 Online: Feb. 20, 2021

An overview on the aquatic fern Azolla spp. as a sustainable source of nutrients and bioactive compounds with resourceful applications