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Rhithrogena germanica (March brown)

Rhithrogena germanica lives chiefly in the riffle sections of larger rivers or their tributaries, where it feeds either by scraping periphyton from the substrate or by gathering fine particulate organic detritus from the sediment.  The nymphs are usually found clinging to submerged plants and stones, although they may swim if disturbed.  There is one generation per year that overwinters as nymphs.  This species shows great synchronicity in its emergence with adults hatching en-masse, typically around mid-day, over several days between late March and early May.

 


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Once mated, the female flies upstream and descends to the surface of the water to release a few eggs by dipping the tip of her abdomen on to the surface at intervals, or by actually settling on the surface for short periods.  After several visits to the water the egg supply is finished and the spent female falls on to the surface.