RiverFish

Grayling · Thymallus thymallus

Grayling in the River Tees

Largest measured grayling: 39.5 cm

The largest grayling measured in Environment Agency surveys of the River Tees was 39.5 cm, recorded at Temporal Coarse, Low Haile Bridge on 22 August 2005.

Across 2,639 measured grayling, the median measured length was 14.3 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 Tees.

See grayling records across England →

Most recent observation9 October 2025SAP/BT Quin, Barnard Castle · 16 fish
Largest measured grayling
39.5 cm
Median length
14.3 cm
Fish measured
2,639
Survey locations
43

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
39.5 cm22 Aug 2005Temporal Coarse, Low Haile Bridge85878
38.7 cm21 Oct 1999SAP/BT Quin, Middelton In Teesdale110627
38.2 cm16 Sept 2003Temporal Coarse, Low Haile Bridge77076
36.9 cm18 Sept 2003Temporal Coarse, Winston77075
36.4 cm17 Aug 2006Temporal Coarse, Croft101624
36.4 cm1 Oct 1996SAP/BT Quin, Middelton In Teesdale110626
36.3 cm2 Oct 1996SAP/BT Quin, Wycliffe110628
35.6 cm21 Oct 2010SAP/BT Quin, Downstream Swine Lairs124766
35.3 cm22 Aug 2005Temporal Coarse, Low Haile Bridge85878
35.1 cm15 Oct 2010Temporal Coarse, Neasham125084

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
SAP/BT Quin, Barnard Castle9 Oct 20259 Oct 20251
SAP/BT Annual, Ornella Farm3 Nov 19999 Oct 20253
SAP/BT Annual, Deepdale Beck - Barnard Castle3 Oct 20168 Oct 20253
SAP/BT Annual, River Balder - Cotherstone1 Dec 199524 Sept 202510
Temporal Coarse, Low Coniscliffe8 Aug 200111 Sept 202511
Temporal Coarse, Neasham13 Aug 200111 Aug 202518
Temporal Coarse, Croft15 Aug 200111 Aug 202517
Temporal Coarse, Low Moor18 Sept 20024 Aug 202517
SAP/BT Quin, River Leven, Crathorne26 Jun 202326 Jun 20231
SAP/BT Quin, River Leven D/s Foxton Bridge26 Jun 202326 Jun 20231
Spatial Coarse, Saltersgill Beck, Saltersgill14 Sept 202214 Sept 20221
SAP/BT Quin, Clow Beck, Willow Bridge12 Sept 201614 Sept 20222
Temporal Coarse, Low Haile Bridge19 Sept 200218 Sept 201815
SAP/BT Annual, Egglestone Abbey1 Oct 199621 Oct 20168
SAP/BT Quin, Clow Beck, Aldbrough St John12 Sept 201612 Sept 20161
SAP/BT Annual, Clow Beck - Monk End Farm25 Sept 200212 Sept 20169
SAP/BT Annual, Broken Scar13 Oct 199910 Aug 201614
SAP/BT Quin, Percy Beck, Barnard Castle27 Jul 201627 Jul 20161
Temporal Coarse, Blackwell Bridge7 Oct 200210 Sept 201512
WFD O Clow Beck at Clow Beck Farm3 Oct 20133 Oct 20131
Temporal Coarse, Swine Lairs u/s ford10 Aug 200121 Oct 20107
SAP/BT Quin, Downstream Swine Lairs13 Jun 200621 Oct 20102
SAP/BT Quin, Ornella Farm 220 Oct 201020 Oct 20101
Temporal Coarse, Middleton One Row23 Aug 200114 Oct 20108
SAP/BT Quin, River Tees Blackwell14 Oct 201014 Oct 20101
Temporal Coarse, Broken Scar15 Aug 20017 Sept 20108
SAP/BT Annual, Summerhouse Beck - Piercebridge25 Sept 20039 Sept 20094
SAP/BT Annual, High Coniscliffe23 Sept 19941 Nov 200712
Spatial Coarse, U/s Broken Scar25 Sept 200625 Sept 20061
Spatial Coarse, Sockburn25 Sept 200625 Sept 20061
Spatial Coarse, Girsby25 Sept 200625 Sept 20061
SAP/BT Quin, Low Coniscliffe25 Sept 200625 Sept 20061
SAP/BT Quin, Girsby25 Sept 200625 Sept 20061
Temporal Coarse, Winston15 Sept 19955 Oct 20056
Temporal Coarse, Clow Beck - Monk End Farm19 Aug 200227 Sept 20042
SAP/BT Quin, Gainford18 Sept 200318 Sept 20031
Spatial Coarse, Blackwell Pumping Station10 Aug 200017 Sept 20034
Spatial Coarse, Mill House, Piercebridge17 Oct 200117 Oct 20011
Temporal Coarse, High Coniscliffe13 Sept 200113 Sept 20011
SAP/BT Quin, Wycliffe21 Sept 199427 Oct 20006
SAP/BT Quin, Middelton In Teesdale22 Sept 19949 Oct 20006
WR Monitoring Egglestone Bridge23 Sept 199421 Oct 19993
SAP/BT Quin, Langley Beck, Selaby Ford14 Nov 199514 Nov 19951

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

1994–2025

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 2,639 measured fish were spread across different length ranges.

Smallest
1.4 cm
Lower quarter
11.6 cm
Median
14.3 cm
Upper quarter
23.4 cm
Largest
39.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Tees

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

Brown / sea trout Bullhead Minnow Stone loach European eel Atlantic salmon

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 →