If it's algae, or one of a few other invasive species, it can be controlled chemically with a herbicide treatment once a year. I treat my ponds every spring for filamentous algae. That's what it looks like but I can't be certain without closeup pics.
I have three ponds that are used for fishing and for irrigation. This stuff gets progressively worse during the summer, when untreated, and clogs the strainers on my irrigation pump's suction pipes. It's a b**ch.
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