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Azolla
Azolla is a heterosporous free-floating aquatic fern distributed in freshwater habitats all over
the world (Wagner, 1997)
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nilotica, A
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filiculoides, A
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rubra are six species of Azolla belonging to family Azollaceae (Mandal et
al
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It has symbiotic association with blue green algae, Anabaena azollae and thus
capable of fixing atmospheric nitrogen (Tung and Shen, 1981)
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, 2003; Ahilan et al
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, 2012; Mahalingam et al
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It also reduces the growth of aquatic weeds
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Azolla is a highly preferred source of protein owing to meet the dietary requirements of the
aquatic organisms mainly finfishes and shellfishes (Mandal et al
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Sood et al
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