Nelliemoser I remember our local Sheffield rivers being so polluted by sewerage and heavy industry they would not sustain any life. They were effectively dead. With the demise of heavy industry and tighter regulation on what goes into the water, they are now back to full health and full of coarse fish, and clean water species such as brown trout, grayling and even salmon. When I was a child there were certainly brown things floating down our local river, but they weren't trout! This is due in no small part as you say to professional environmentalists, but also to groups of ordinary individuals who did, and still do, their bit to clean up, monitor and maintain the waterways and fish passes.
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