Lower Avon invertebrate sample

Michael collected, sorted and identified an invertebrate from the lower Avon at Delnashaugh about three weeks ago so it is about time I posted the results on here.

First the standard picture:

Sorted in the usual format with mayflies top left, beetles top right, caddis bottom right and stoneflies bottom left.

The sample was dominated by stoneflies, mostly Leuctridae (Needle flies) with a few of the larger species. There were over 200 aquatic beetles, both adults and larvae. Quite a productive sample for mid summer. Obviously more than adequate for the large head of juvenile fish in the lower Avon, quite a contrast with the very sparse sample from the upper Avon.