FLYFISHING COURSES | THE BOOKSHOP
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Fungi | Reptiles | Bats | Land Mammals | Birds | Fish | Insects | Amphibians | Wild Flowers | Trees FLYFISHING COURSES | THE BOOKSHOP |
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Baëtis vernus/Baëtis tenax - Medium OliveThe medium olive is an important summer fly on chalk streams and on many spate rivers too. Baëtis vernus and Baëtis tenax are very similar, and so anglers give then the same common name. Peak hatches occur in May and June, but these flies are to be found on rivers until at least August. The nymphs are agile darters.
The dun, pictured above, hatches from mid morning until late afternoon or early evening and tends to come off the water in a trickle hatch (unlike, for example, March Browns, which usually come off in flushes).
The spinner - a female is shown above - is a little darker, with clear wings. Anglers use a Tups Indispensable as is a reasonably good spinner imitation; it is best fished awash rather than riding high on the surface. These are flies that lay their eggs on submerged vegetation and then drift back to the surface, where the trout are only too keen to put them out of their misery.
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