The trouble is that such turbines have a tremendous flow through. And as ship builders have long known, paints strong enough to prevent organisms from clinging to hulls have to be incredibly toxic.
paints are one way of doing it but materials surfaces can also be tailored on a molecular level in such a way as to make them impossible for organisms to cling to.
don’t ask me how. I just know the materials research crowd have the tools to know how the organisms grip surfaces and then how to create surfaces that thwart that grip in depth.