The Arques is a quiet Normandy chalk stream near Dieppe that holds a genuine sea trout run alongside its resident brown trout and grayling — 28 declared sea trout in 2024, which places it ahead of several more famous French migratory rivers. The chalk character gives it stable, clear water and prolific invertebrate life. Small olives and evening sedges sustain selective dry-fly fishing for brown trout through the season. Sea trout enter from the estuary and run on spate water, providing a secondary but credible target from summer through autumn.
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.
- Chalk