The BBC report of this story is HERE
But in it, the RSPB's Mark Avery says: "Otters, water voles, kingfishers and more than 30 species of fish all rely on our rivers and we have a responsibility to keep them healthy and clean."
Ok, 30 species. Can you name them all?
Bleedin ell Peter, you're right. I couldn't mentally conjure up more than about 15, so that proves how dim I am. Mind you, the list DOES include minnows and sticklybacks. Exactly 30 species in total....