River Una · hatch chart
Grayling from 1 May to 31 October; brown trout all season with a winter closure on some sections
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 (Rhyacophila) | Adult, night | #12-14 | 21:00-00:00 | |
| 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 |
Flow and visibility
The Una is a karst river and stays clear for most of the year, but it responds quickly to rain in the surrounding hills: a summer storm can raise it half a metre in three hours and colour it for a day. The tufa barriers mean the pools stay deep even at low water, so the grayling fishing holds up through the summer when smaller Balkan rivers are too low.
The insect plate
