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Caenis robusta (Anglers' curse)

Caenis robusta has a widespread, though localised distribution.  The majority of records for this species are from the South East of England, however there are records from as far north as Sutherland and the Western Isles.  Nymphs of this species live in the pools and margins of rivers, or on lake shores or in canals, where they live in silt and mud on the bed.  The nymphs are poor swimmers but are adapted for moving amongst the sediment.  They feed by collecting or gathering fine particulate organic detritus from the sediment. 

 

There is either one or two generations a year, one of which overwinters as nymphs.  Adults have been recorded in June and July.

 


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Emergence of the adults probably takes place partially or entirely out of the water on a stick, stones or plant stem at dawn or dusk