River Tweed · hatch chart
Salmon 1 February to 30 November; trout 15 March to 30 September; grayling over the winter
By month
JanFebMarAprMayJunJulAugSepOctNovDec
| Month | Insect | Stage | Size | Time | Intensity |
|---|---|---|---|---|---|
| Mar | Large Dark Olive (Baetis rhodani) | Dun | #14 | 13:00-16:00 | |
| Apr | Grannom caddis (Brachycentrus) | Adult | #14 | 12:00-16:00 | |
| May | Mayfly (Ephemera danica) | Dun and spinner | #10-12 | 11:00-16:00 | |
| Jun | Blue-Winged Olive (Serratella) | Dun at dusk | #16-18 | 20:00-22:30 | |
| Jul | Sedge caddis (various) | Adult, night | #12-16 | 21:30-00:30 | |
| Sep | Salmon fly (attractor) | Swung wet fly | #4-8 | 08:00-17:00 | |
| Nov | Grayling nymphs and olives | All stages | #14-18 | 11:00-15:00 |
Flow and visibility
The Tweed is the classic spate river: it can rise two metres overnight after rain in the Borders hills and colour up completely, then drop and clear over three or four days. Salmon run on the rising water and on the first day of the drop, which is why the productive days are the ones immediately after a spate. The gauge at Norham is the one to watch.
The insect plate
