Since the dam on the Thames here London has been out of commission more and more of the natural fish have been coming back.
Here a link to a urban shore fisher that caught and released a 39 inch muskie.
Leave the river alone and let it bring back all the fish that use its entire length.
http://www.lfpress.com/2017/09/11/one-anglers-big-catch-stirs-more-dam-debate
Yeah maybe the dam had its purpose, after the flooding that happened in the 50; but since then I hope we've learned not to build dwellings on flood plains?
Dan.