RiverFish

Grayling · Thymallus thymallus

Grayling in the River Calder

Largest measured grayling: 32.5 cm

The largest grayling measured in Environment Agency surveys of the River Calder was 32.5 cm, recorded at Downstream Altham Bridge on 24 August 2018.

Across 53 measured grayling, the median measured length was 11.5 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 observation29 August 2025Downstream Altham Bridge · 5 fish
Largest measured grayling
32.5 cm
Median length
11.5 cm
Fish measured
53
Survey locations
3

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
32.5 cm24 Aug 2018Downstream Altham Bridge153214
32.4 cm24 Aug 2018Downstream Altham Bridge153214
30.7 cm24 Aug 2018Downstream Altham Bridge153214
30 cm3 Jul 2023Downstream Altham Bridge162490
29 cm24 Aug 2018Downstream Altham Bridge153214
28 cm24 Aug 2018Downstream Altham Bridge153214
27 cm24 Aug 2018Downstream Altham Bridge153214
27 cm24 Aug 2018Downstream Altham Bridge153214
26.4 cm16 Sept 2019Downstream Altham Bridge155443
25 cm28 Oct 2016Downstream Altham Bridge149932

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
Downstream Altham Bridge28 Jul 201429 Aug 20256
Foxcroft17 Aug 202317 Aug 20231
Upstream A59 Road Bridge18 Oct 201818 Oct 20181

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

2014–2025

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 53 measured fish were spread across different length ranges.

Smallest
7.5 cm
Lower quarter
10.2 cm
Median
11.5 cm
Upper quarter
16.3 cm
Largest
32.5 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.

European eel Brown / sea trout Bullhead Chub Gudgeon 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 →