"Genetically, what's gone in that river over the weekend last Friday, is gone and it's gone forever." The incident was detected on Friday when fishery officers found large numbers of dead fish ...

The Loughs Agency said more than 2,000 dead fish had already been been collected from the Glenmornan river in the village of Artigarvan, near Strabane, but that figure was expected to rise.

McNeish and a group of graduate students have been documenting their observations of the disappearing river, and have counted ...