May 7, 2021, 12:06 am The Diglis fish pass in Worcester will help twaite shad navigate further up the River Severn (Unlocking The Severn/PA) Sign up for our daily newsletter featuring the top stories from The Press and Journal. Thank you for signing up to The Press and Journal newsletter. Something went wrong - please try again later. Sign Up One of the UK’s rarest fish is getting the chance to return to historic breeding grounds on the River Severn which have been cut off by weirs for 170 years. And as part of conservation efforts to help the endangered twaite shad, citizen scientists are also being sought to head out in the dead of night to monitor the distinctive sounds of their spawning.