A dedicated monitoring programme has revealed small numbers of the Killer shrimp, Dikerogammarus villosus, in an area of Barton Broad, Norfolk. This is a highly invasive non-native species, currently known only from three other sites in England and Wales. If the shrimp became established and widespread in the UK it could pose a serious threat to native species.

Anglers’ Monitoring Initiative season fast approaching, Orange-striped stonefly survey, new adult caddis key and more in the Spring Newsletter 2012.
 

The Orange-striped stonefly is the subject of a new survey by the Riverfly Recording Schemes. British populations of the Orange-striped stonefly have recently been classified as a seperate species to Perlodes microcephalus, a species common across the rest of Europe. The new name for the British species is Perlodes mortoni.

Caddis experts Peter Barnard and Emma Ross have authored the new RES Handbook of The adult Trichoptera (caddisflies) of Britain and Ireland. Whether interested in caddis from an angling or freshwater perspective, or a moth trapper wanting to find out more about caddis bycatch, this guide is set to be the standard work on identifying adult caddisflies for years to come. Available from The Field Studies Council for £29.50.