Looks like you have a good crop of hair algae. I have some growing in my pond also. You can manually remove a lot of it, some folks wrap it around a dedicated toilet brush to pull it out. Once my goldfish get in, they will start feeding on it if they are not otherwise well fed.
Mother nature will do as she feels. Warm winter now a cool spring. longer it takes the plants to start growing and feeding the longer the algae battle will be
THE POND HAD SOME HAIR ALGAE, WHEN SPRING BROKE but it is disappearing fast, as there's none left in the main pond. A little is on the falls from the bog. But after some vacuuming the ponds algae has all but disappeared.
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