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Message: <blockquote data-quote="Derek Polley" data-source="post: 1091039" data-attributes="member: 51074"><p>Not that common as they mainly occur in upland streams so you need to be looking in Mournes, Sperrins or Antrim. They can be found lower down usually where there is rough water or rapids. The key factor is unpolluted water and not too acid as this kills off the insects they feed on, hence their being found higher up where pollution is less of a feature. I once had the joy of watching one on the Knock/Cherryvalley River in East Belfast for a couple of years but a pollution spill meant it  moved on/died.</p></blockquote><p></p>