No, I think it a fair question. I have heard that sunfish (bluegills) are often put in man-made lakes and ponds to eat mosquito and fly larvae. And the pic seems to resemble fish of that species. I would think roughfish and bottom feeders like bullheads/catfish would control other unwanted species too, and they can survive in yuckier low-oxygen environments. How long this has been going on, I dunno, but all the duck crap can't be too good either. I have no idea if they filter/flush this thing or just let it go. Maybe they'll blame it all on the SEQUESTOR too!