If you try manual removal,you'll entrap/entrain every fish/fry/fingerling in its path.
And it'll be back the next day.
I've been in the biz a long time,and have learned to deal with most everything,but this is some BAD stuff.
New Zealand had horiffic blooms of it-birds would nest on it.Wisc. also had troubles in the 30s and 40s.
Ours seems to act a little different from all the lit I've read.

Brings to mind the old saying,

"Too thick to swim,too thin to plow".