Pond weed type?
Discussion
It does appear to me to be some type of blanket algae but it's not that relevant. Even if you kill it off it will regrow unless you remove the nutrients from the system. Consider blocking sunlight, inflowing water that may contain excess nutrients, dead vegetation in the pond, over feeding of the fish, sludge removal from the base. Do you have a pump and filter, is that working correctly? Consider a UV lamp to kill off algae & bacterial. Also look at pH and buffering capacity, slightly alkaline will apparently assist with natural nitrogen removal.
I would go so far as to say ignore it. As it's covering the bottom of the pond it will contain useful microlife and I imagine the fish will grub around in it. Plus it's better to look at that than a black plastic liner. Although this probably a type of Spirogyra, commonly blanket weed floats and get tangled up with everything clogging the pond, this does not appear to be doing that.
The UV light will only kill algae which go through it (ie suspended in the water) not filamentous types growing from the bottom. And killing the suspended algae will make the water clear, allowing the light to the bottom, where the filamentous stuff can use it.
Deal with the nutrients, or shade the pond, is the way to do it.
Deal with the nutrients, or shade the pond, is the way to do it.
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