
A barrier has been installed between two Scottish rivers in an attempt to block the spread of non-native North American signal crayfish "invaders".
The animals are already present in the River Clyde but it is hoped they can be stopped from reaching the River Annan.
First found in Scotland in 1995, the crayfish have been blamed for eating young fish and destroying habitats.
Scottish Natural Heritage (SNH) described it as a "landmark" attempt to control the spread of the crustaceans.
Environmental experts have identified a "pressing need" to stop the creatures moving from the Clyde into the Annan.
A large number of rivers and lochs across Scotland have already been affected by the signal crayfish.
They include Loch Ken in Dumfries and Galloway where a five-month trapping programme two years ago killed more than 700,000 of them but failed to eradicate the problem.
SNH hopes the new barrier will prevent similar problems on the River Annan, a popular location for salmon and trout fishing.
This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.
Source: http://www.bbc.co.uk/go/rss/int/news/-/news/uk-scotland-south-scotland-13964184
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