Nope. I think they've actually searched very little of the river, save perhaps for the small stretch that leads directly onto the river bank from the main path in Oak Road Park. Can't remember having seen boats and such scouring the whole run of it. Not only could the reeds snag a body floating along, they would make good cover in and of themselves. This is what concerned me walking round the other day. There are tall reeds several meters thick in parts. I took photos of some. Areas have been trodden, like tunnels leading through. Too large to have been done by foxes etc. They could provide a convenient entry point to the river, or just as a place to conceal a body within the reeds themselves.
It's daunting when you think about it. Such a difficult area to search comprehensively.