Rithrogena semicolorata - Olive Upright
The olive upright, a close relative of the March
Brown, is found on just about every river in Britain, and it is probably
the most abundant spring fly of all. The nymphs are flattened stone clingers
and are found in all kinds of running water, including chalk streams and
spate rivers.
The dun
The dun - a female is pictured above - hatches throughout the day from
May until July. Hatches are often heaviest towards evening, and at that time
the spinners also appear, but their egg laying occurs very late in the day
so that the duns are usually far more important as far as trout fishers are
concerned.
This is a particularly important fly in spring, and it is also well worth
imitating if you are fishing for wild
brown trout.
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