Mayflies
Caddisflies
Gammarids
- Ecology: Moderate
- Chemical: Unknown
WFD classification · NL60_ROER
Rules at a glance
- Permit required
Water temperature for Pike
Ideal16°C est.ideal 8–18°C
0°14°28°
How to fish it · for Pike
When
Spring (April–May) and autumn (September–November); summer pike fishing dawn/dusk
Where
Limburg river flowing from Germany and Belgium with some trout in the upper sections near the border.
Why this works
Excellent — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Caddisflies
- Large sedgesMost likelyNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 4 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
Trout seasonSeason
1
2
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Pike
8–10 · Streamer
Strip it for fish chasing fry or in coloured water.
14–16 · Nymph
Search the runs and pockets, dead-drift near the bottom.
Permits & access
Permit required — see local rules.
- VISpas (Dutch fishing pass) required — available from Sportvisserij Nederland
- No national exam required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
Roer Terrain map
Water quality (WFD)
The full read · show the working · for Pike · confidence 90%
How the 88 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow90 × 22%19.8
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity78 × 12%9.4
Conditions total= 89
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 March → 30 September
- Pike 31 May → 28 February
Dutch national closed season for pike (snoek) is 1 March–last Saturday of May (release-only during that window) — correcting an earlier assumption of a Dec–Feb closure. No Roer/Limburg-specific exception was found. The close date shifts yearly (last Saturday of May); '31 May' reflects 2026 and will need updating in years where that Saturday falls later.
Related guides
Booking & contacts
Roer
Water temperature for Pike
Ideal16°C est.ideal 8–18°C
0°14°28°
How to fish it · for Pike
When
Spring (April–May) and autumn (September–November); summer pike fishing dawn/dusk
Where
Limburg river flowing from Germany and Belgium with some trout in the upper sections near the border.
Why this works
Excellent — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Caddisflies
- Large sedgesMost likelyNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 4 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
Trout seasonSeason
1
2
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Pike
8–10 · Streamer
Strip it for fish chasing fry or in coloured water.
14–16 · Nymph
Search the runs and pockets, dead-drift near the bottom.
Permits & access
Permit required — see local rules.
- VISpas (Dutch fishing pass) required — available from Sportvisserij Nederland
- No national exam required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
Roer Terrain map
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · NL60_ROER
The full read · show the working · for Pike · confidence 90%
How the 88 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow90 × 22%19.8
Clarity85 × 18%15.3
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity78 × 12%9.4
Conditions total= 89
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 March → 30 September
- Pike 31 May → 28 February
Dutch national closed season for pike (snoek) is 1 March–last Saturday of May (release-only during that window) — correcting an earlier assumption of a Dec–Feb closure. No Roer/Limburg-specific exception was found. The close date shifts yearly (last Saturday of May); '31 May' reflects 2026 and will need updating in years where that Saturday falls later.
Related guides
Booking & contacts