Ephemerella ignita - Blue-winged Olive
The blue-winged olive nymphs are moss creepers and of limited importance
to anglers because of their habit of crawling within dense mosses or resting
under stones where trout cannot easily find them.
The dun
The duns hatch from mid morning until late afternoon, and
are most abundant in June, July and early August.
The spinner
The sherry spinner, the female spinner of the blue-winged olive, is seen
here with her green ball of eggs. This is a very important fly on the rivers
of Wales, and particularly dense hatches occur on the Teifi, the Usk and the
Wye.
Fishing tip
On spate rivers, sherry spinners tend to congregate above the rapid
waters between pools. There they swarm just before egg laying, and trout
take up station either on the lip of the pool or at the head of the next
pool downstream. A dry Sherry Spinner fished in such locations often tempts
some very fine trout at dusk.
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