snrub, I'll deny I said it if anybody asks, but WP under the correct conditions is one of my favorite nuisance plants.
Small fish love the cover, larger fish love the shade, and it pens well to the bank "if" the dropoff is steep enough. Where I've had problems with it, is on gradual slopes where it can crawl with the water drop and just be a mess to deal with. I always keep a patch on the dam in my brood pond for the fry, and control it as needed.
