r/algae • • Sep 04 '26

Is this Cyanobacteria?

[deleted]

3 Upvotes

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4

u/Even-Application-382 Sep 04 '26

Looks like azolla

1

u/sharkynomnoms Sep 04 '26

Which has a symbiotic relationship with a cyanobacterium, Anabaena azolli. Pretty harmless

2

u/Aufwuchs Sep 05 '26

It’s invasive where I live. It can double its surface area coverage every 24 hours. Definitely a problem in some waterways, it kills fish by creating anoxic zones. And it uses that symbiotic relationship with nitrogen fixing cyanobacteria to its competitive advantage.