Yorkshire's rivers are being cleared of physical barriers linked to the region's industrial past to support fish migration and improve habitats.
The work is part of a £21m programme to remove or modify structures, many associated with mills and heavy industries that were powered by Yorkshire's waterways.
Led by the Environment Agency, the Rivers Trust and Yorkshire Water, the partnership seeks to reconnect waterways, enabling fish to travel freely and breed.
Anna Gerring, the Rivers Trust's deputy director for strategy and development, said that tackling barriers to fish migration would also bring wider environmental benefits, including improved water quality and enhanced biodiversity.