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The lake olive is one of very few upwinged flies that occur in large numbers on some lowland lakes in Britain. (Tal-y-llyn lake in mid Wales has good hatches.) This fly is not usually found in small pools; however, there its close relative the Pond Olive (Cloëon diptera) is more common. The nymph is an agile darter.
The dun leaves the surface in open water, usually well away from the shore, and so when duns are hatching a dry fly can give good sport.
The 'apricot' spinner lays her eggs on the surface from late afternoon on into darkness. A Tups Indispensable is a pretty good representation of the egg-laying spinner.
Anyone interested in aquatic fly life and other freshwater invertebrates - and particularly those who enjoy flyfishing for trout and grayling, Pat O'Reilly's bestselling book Matching the Hatch is an indispensable guide. Author-signed copies are available online here...
Algarve Wildlife - the natural year is an indispensable companion if you intend visiting Portugal. Details...