Major southwest spate river flowing through Dumfries with spring salmon (March–May) and strong autumn runs (October–November) — the Nith's long season (February to November) rewards patience. Excellent summer sea trout in July–August. Slower response (8 hours) gives opportunity for planning — wait for suitable water conditions rather than chasing every spate. Fish spring salmon with sinking-tip and medium tubes on upper beats; autumn fish require systematic pool coverage with smaller doubles. One of southwest Scotland's most productive systems overall.
- Mixed