Traun River · hatch chart
Trout 1 April to 30 September, grayling 1 May to 31 December on most beats
By month
JanFebMarAprMayJunJulAugSepOctNovDec
| Month | Insect | Stage | Size | Time | Intensity |
|---|---|---|---|---|---|
| May | March Brown (Rhithrogena) | Dun | #12-14 | 11:00-16:00 | |
| May | Grannom caddis (Brachycentrus) | Adult | #14 | 12:00-17:00 | |
| Jun | Blue-Winged Olive (Serratella) | Dun at dusk | #16-18 | 20:00-22:30 | |
| Jul | Caddis (Hydropsyche) | Adult, night | #12-14 | 21:30-00:30 | |
| Sep | Blue-Winged Olive (Serratella) | Spinner fall | #16-18 | 14:00-17:00 | |
| Oct | Grayling nymphs and shrimps | All stages | #14-18 | 11:00-16:00 | |
| Dec | Midges and small olives | Pupa | #18-22 | 11:30-14:30 |
Flow and visibility
The Traun's flow comes largely from springs, so it is far more stable than a typical alpine river, and the water temperature stays under 15°C all summer. That stability is why the hatches are so dependable and why the grayling grow so large. Rain in the Dachstein burns the tributaries first, so watch for colour coming in from the side rather than from the main stem.
The insect plate
