Mayflies
Caddisflies
Damselflies & dragonflies
Gammarids
- Ecology: Unknown
- Chemical: Unknown
Rules at a glance
- Free fishing
- Fly only
Water temperature for Grayling
Ideal6°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Likely species
Mayflies
Caddisflies
- Net-spinning caddisMost likelyLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- Rhyacophila nubila (Nordic free-living caddis)Also possibleLower confidenceNearest relative#10–12–14–16 · NymphPrincipal free-living caddis; larva a year-round searcher.
Damselflies & dragonflies
Hatch timeline · tomorrowPeak at 10h
12h(now) — Black Midge
Stage: On emergersApproach: Emerger or dryActivity: 40%
Also:Iron Blue29%Autumn Needle Fly29%
Peak emergence window4 food groups active
Peak activity at 10h — Black Midge (Black Midge, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
1
Nordic SpringflyHatch
2
3
3
2
Ladoga CaddisHatch
2
3
2
Evening SedgeHatch
2
3
3
3
2
Arctic Cased CaddisHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Grayling
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
- Local iFiske permit required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 2
Terrain map
Water quality (WFD)
The full read · show the working · for Grayling · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity48 × 12%5.8
Conditions total= 83
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 June → 31 August
- Char varies_by_permit → varies_by_permit
Arctic char present in Umeälven's upper sections. iFiske or local FVOF permits define char seasons — check local rules for the exact waters and periods where char fishing is permitted.
Related guides
Booking & contacts
Umeälven upper waters
Water temperature for Grayling
Ideal6°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Likely species
Mayflies
Caddisflies
- Net-spinning caddisMost likelyLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- Rhyacophila nubila (Nordic free-living caddis)Also possibleLower confidenceNearest relative#10–12–14–16 · NymphPrincipal free-living caddis; larva a year-round searcher.
Damselflies & dragonflies
Hatch timeline · tomorrowPeak at 10h
12h(now) — Black Midge
Stage: On emergersApproach: Emerger or dryActivity: 40%
Also:Iron Blue29%Autumn Needle Fly29%
Peak emergence window4 food groups active
Peak activity at 10h — Black Midge (Black Midge, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
1
Nordic SpringflyHatch
2
3
3
2
Ladoga CaddisHatch
2
3
2
Evening SedgeHatch
2
3
3
3
2
Arctic Cased CaddisHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Grayling
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
- Local iFiske permit required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 2
Terrain map
Water quality (WFD)
- Ecology: Unknown
- Chemical: Unknown
The full read · show the working · for Grayling · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity48 × 12%5.8
Conditions total= 83
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 June → 31 August
- Char varies_by_permit → varies_by_permit
Arctic char present in Umeälven's upper sections. iFiske or local FVOF permits define char seasons — check local rules for the exact waters and periods where char fishing is permitted.
Related guides
Booking & contacts