Stoneflies
It rises on the western flank of the Massif Central, runs west through Brantôme and Ribérac and the heart of the Périgord, and gathers its water less from rainfall than from the Jurassic limestone aquifer that buffers the whole catchment. The result is a river that runs clear and stable almost year-round, with wild brown trout populations that are the envy of most of Europe and nearly invisible to the fishing press because nobody writes about it in English. Guy Plas wrote about the Dronne. Every serious French fly fisher in the south-west knows it. The beats around Brantôme — the famous 'Venice of the Périgord' — hold good wild trout that rise freely to small olives, caddis, and terrestrials through spring and summer. The hatches are honest without being spectacular: Baetis from late March, olives through April and May, caddis building from May, and enough terrestrial opportunity in June and July to keep the dry fly busy. The groundwater buffering means the river holds condition through dry spells, though it will warm noticeably in prolonged summer heat. Fish it carefully, respect the wild stock, and treat it as the find that it is. The Dronne has been quietly producing great fishing for decades while the rest of the world was queueing for the Test.
In chalk-spring and karst trout systems, generally stable temperatures broaden olive and other mayfly activity from early spring into autumn, with strong evening caddis, steady subsurface scuds and buzzers where clear groundwater and weedbeds develop, and terrestrials from meadow and woodland banks rounding out the food calendar, depending on how fast each river drops and clears after rain.
- Limestone