RiverFish

Grayling · Thymallus thymallus

Grayling in the River Calder

Largest measured grayling: 41.2 cm

The largest grayling measured in Environment Agency surveys of the River Calder was 41.2 cm, recorded at Elland power Station d/s on 6 July 2009.

Across 705 measured grayling, the median measured length was 20 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Calder.

See grayling records across England →

Most recent observation14 August 2025Dewsbury Fry Survey · 10 fish
Largest measured grayling
41.2 cm
Median length
20 cm
Fish measured
705
Survey locations
8

Individual EA measurements

Largest measured grayling

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
41.2 cm6 Jul 2009Elland power Station d/s117795
36.5 cm7 Jul 2009Dewsbury (end of flood relief channel)117763
35.8 cm22 Jun 2015Sands Mill (Dewsbury)145162
34.1 cm10 Jul 2009Cornmill Weir119691
33.3 cm8 Jul 2002Elland power Station d/s72320
33.1 cm30 Jul 2012Dewsbury (end of flood relief channel)132609
32.8 cm2 Aug 2007Elland power Station d/s108397
32.7 cm23 Jul 2024Dewsbury (end of flood relief channel)165840
32.7 cm13 Aug 2013Elland power Station d/s140064
32.4 cm20 Sept 2007Dewsbury (end of flood relief channel)108391

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where grayling were found

Each point marks a survey location with at least one grayling record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding grayling
Dewsbury Fry Survey22 Aug 201714 Aug 20253
Dewsbury (end of flood relief channel)20 Sept 200723 Jul 20244
Elland power Station d/s8 Jul 20022 Jul 202413
Chantry Bridge4 Jul 201224 Jun 20242
Sands Mill (Dewsbury)22 Jun 201522 Jun 20151
Cornmill Weir9 Jul 200219 Jun 201510
Brighouse Industrial Estate9 Jul 20026 Jul 20107
Us Elland Power station2 Jul 19992 Jul 19991

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

1999–2025

Survey records by year

Each bar shows how many survey visits recorded grayling that year.

Fish measured by surveyors

Measured length distribution

See how the 705 measured fish were spread across different length ranges.

Smallest
4.2 cm
Lower quarter
17.2 cm
Median
20 cm
Upper quarter
22.3 cm
Largest
41.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Calder

Compare other species with enough survey and measurement data for a detailed page.

Brown / sea trout Stone loach Bullhead Gudgeon Chub Roach

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →