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Two Yorkshire rivers have been restocked with 4,000 fish as the county's river water quality was declared the best for two decades.
The Environment Agency is to release 3,000 barbel in the river Aire, West Yorkshire, and a further 1,000 in the river Don, South Yorkshire.
The agency said the region's rivers were at their healthiest for 20 years.
Peter Mischenko, fisheries officer, said: "The fish will be the last we put into the river Don."
Surveys carried out by the agency show that the Don's fish stocks are now at a sustainable level with a breeding population.
Its fish farming programme started about 10 years ago to help the Don recover from an industrial heritage that depleted fish stocks.
More oxygen
The barbel is a native species and is bred at the agency's fish farm at Calverton in Nottinghamshire.
The barbel released into the rivers have been marked so they can be identified if caught during fish surveys.
This will show surveyors whether caught fish have been stocked or bred naturally.
The fish will be put into the River Aire, at various locations near Keighley, Bradford and Leeds.
The river Don will see fish introduced at Blackburn Meadows in Sheffield and Kilnhurst.
The Environment Agency said November was a good time for restocking because fish travelled better in cold water as it contained more oxygen.
I wish they'd done it to the Aire 10 years ago, it would've saved me a fortune in fuel travelling to the Trent..I'll be in my zimmer frame roving my local river