Stoneflies
Caddisflies
Gammarids
- Ecology: Moderate
- Chemical: Unknown
WFD classification · FI14_112_YVM
Water temperature for Atlantic Salmon
Cool — slow8°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Likely species
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.
- Large sedgesAlso possibleNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · tomorrowPeak at 11:00
12:00(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 47%
Also:Black Midge44%Autumn Olive37%
Peak emergence windowWeather boost7 food groups active
Peak activity at 11:00 — Autumn Needle Fly (Autumn Needle Fly, 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.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
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
Salmon runRun
1
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Nordic SpringflyHatch
2
3
3
2
Ladoga CaddisHatch
2
3
2
Arctic Cased CaddisHatch
2
3
3
3
2
Large Summer DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Atlantic Salmon
small to medium tube · Salmon fly
Permits & access
Permit required — see local rules.
- Kalastonhoitomaksu plus local rapid- or beat-specific permit required
- Kymijoki is a managed anadromous system, so current access rules, catch regulations and restoration-related restrictions should be checked before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 2
Kymijoki, Finland Terrain map
Water quality (WFD)
The full read · show the working · for Atlantic Salmon · confidence 75%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Directions
Seasons & zones
- Salmon 1 June → 31 August
- Trout Opens June–September
- Grayling 1 June → 31 March
Finnish inland grayling (harjus) rule south of 67°N: closed 1 April – 31 May. Open 1 June – 31 March. Grayling is fully protected in sea areas. Minimum size typically 30-35 cm depending on water. Check Metsähallitus (state waters) or local fishing association permit.
Closed in spring for spawning.
Prime sport 1 August → 30 November
Sea trout: Variable seasonal (2026) — The Kymijoki drains into the Gulf of Finland and carries both Atlantic salmon and Baltic sea trout runs. Baltic sea trout stocks are managed through adipose-fin clipping (wild fish released; hatchery fish retained). The river is dam-regulated which limits migration windows. Sea trout runs are condition-dependent — legal but sensitive.
Related guides
Booking & contacts
Kymijoki
Water temperature for Atlantic Salmon
Cool — slow8°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Likely species
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.
- Large sedgesAlso possibleNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · tomorrowPeak at 11:00
12:00(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 47%
Also:Black Midge44%Autumn Olive37%
Peak emergence windowWeather boost7 food groups active
Peak activity at 11:00 — Autumn Needle Fly (Autumn Needle Fly, 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.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 as a supporter.
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
Salmon runRun
1
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Nordic SpringflyHatch
2
3
3
2
Ladoga CaddisHatch
2
3
2
Arctic Cased CaddisHatch
2
3
3
3
2
Large Summer DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Atlantic Salmon
small to medium tube · Salmon fly
Permits & access
Permit required — see local rules.
- Kalastonhoitomaksu plus local rapid- or beat-specific permit required
- Kymijoki is a managed anadromous system, so current access rules, catch regulations and restoration-related restrictions should be checked before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 2
Kymijoki, Finland Terrain map
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · FI14_112_YVM
The full read · show the working · for Atlantic Salmon · confidence 75%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Directions
Seasons & zones
- Salmon 1 June → 31 August
- Trout Opens June–September
- Grayling 1 June → 31 March
Finnish inland grayling (harjus) rule south of 67°N: closed 1 April – 31 May. Open 1 June – 31 March. Grayling is fully protected in sea areas. Minimum size typically 30-35 cm depending on water. Check Metsähallitus (state waters) or local fishing association permit.
Closed in spring for spawning.
Prime sport 1 August → 30 November
Sea trout: Variable seasonal (2026) — The Kymijoki drains into the Gulf of Finland and carries both Atlantic salmon and Baltic sea trout runs. Baltic sea trout stocks are managed through adipose-fin clipping (wild fish released; hatchery fish retained). The river is dam-regulated which limits migration windows. Sea trout runs are condition-dependent — legal but sensitive.
Related guides
Booking & contacts