RiverFish

Grayling · Thymallus thymallus

Grayling in the River Test

Largest measured grayling: 42.5 cm

The largest grayling measured in Environment Agency surveys of the River Test was 42.5 cm, recorded at Wherwell Upper on 17 July 2012.

Across 808 measured grayling, the median measured length was 21 cm.

Surveyors recorded weights for 447 grayling. The median was 4.2 oz (0.12 kg) and the largest recorded weight was 1 lb 9 oz (0.71 kg).

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

See grayling records across England →

Most recent observation15 September 2025Mottisfont Bittern Shallow · 1 fish
Largest measured grayling
42.5 cm
Median length
21 cm
Fish measured
808
Survey locations
49

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
42.5 cm17 Jul 2012Wherwell Upper132378
39.4 cm29 Jul 2004Testbourne80757
37.7 cm17 Sept 2002Freefolk55096
37.6 cm17 Sept 2002Freefolk55096
37.5 cm17 Jul 2012Wherwell Upper132378
37 cm23 Sept 2014Romsey War Memorial Park143102
37 cm14 Nov 2003Romsey War Memorial Park78495
36.8 cm18 Aug 2005Fish Lake86381
36.8 cm13 Jul 2004Wherwell Lower80551
36.7 cm8 Jul 2004Longparish, Southside Farm80388

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
Mottisfont Bittern Shallow15 Sept 202515 Sept 20251
Linhay Meads Fishermans Meadow15 Sept 202515 Sept 20251
Romsey War Memorial Park14 Nov 200322 Aug 202519
Mottisfont Abbey stocked trout removal12 May 202312 May 20231
Kimbridge Mill Cottage18 Sept 201922 Sept 20202
Grayling Island21 Sept 202021 Sept 20201
Mayfly4 Oct 20046 Sept 20182
Tufton Carrier8 Jun 200428 Sept 20163
Timsbury Mayfly carrier7 Sept 201021 Sept 20162
Mottisfont Abbey, Oakley carrier15 Jul 200421 Sept 20163
Kimbridge, New stream16 Sept 201020 Sept 20162
Stockbridge, Marsh Court14 Jul 20046 Sept 20163
Moorcourt Carrier25 Aug 200425 Aug 20162
Fairbourne stream, Brook Farm8 Jul 20148 Jul 20141
Freefolk Piscatorial5 Oct 20125 Oct 20121
Horsebridge7 Jul 200423 Aug 20124
Wherwell Upper17 Jul 201217 Jul 20121
Dublin Farm13 Jul 200417 Jul 20122
Leckford Carrier12 Jul 201212 Jul 20121
Chilbolton Common12 Jul 201212 Jul 20121
Timsbury carrier restoration site18 Oct 201118 Oct 20111
Tufton Main15 Oct 201015 Oct 20101
Freelands House, Wherwell17 Sept 201017 Sept 20101
Compton Carrier26 Sept 200117 Sept 20105
Longparish, Southside Carrier16 Sept 201016 Sept 20101
Longstock Mill16 Sept 200826 Aug 20102
Sheepbridge14 Jul 200429 Jul 20102
Bunnies4 Oct 200417 Sept 20092
Red River Carrier, Broadlands15 Aug 200815 Aug 20081
Freefolk26 Sept 200128 Aug 20055
Fish Lake18 Aug 200518 Aug 20051
Leckford Beat 134 Oct 20044 Oct 20041
Timsbury Manor Carrier24 Sept 200226 Aug 20043
Saddlers Mill26 Aug 200426 Aug 20041
Memorial Park Main26 Aug 200426 Aug 20041
Moorcourt Main25 Aug 200425 Aug 20041
Papermill Farm24 Aug 200424 Aug 20041
Laverstoke19 Aug 200419 Aug 20041
Linhay Meads12 Aug 200412 Aug 20041
Dead End30 Jul 200430 Jul 20041
Testbourne29 Jul 200429 Jul 20041
Compton16 Jul 200416 Jul 20041
Kimbridge main15 Jul 200415 Jul 20041
North Head14 Jul 200414 Jul 20041
Wherwell Priory13 Jul 200413 Jul 20041
Wherwell Lower13 Jul 200413 Jul 20041
Longparish, Southside Farm8 Jul 20048 Jul 20041
Bossington Mill7 Jul 20047 Jul 20041
Timsbury main river24 Sept 200224 Sept 20021

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

2001–2025

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 808 measured fish were spread across different length ranges.

Smallest
3.9 cm
Lower quarter
12 cm
Median
21 cm
Upper quarter
26 cm
Largest
42.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 447 grayling. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.003 kg)
Lower quarter
0.7 oz (0.02 kg)
Median
4.2 oz (0.12 kg)
Upper quarter
7.2 oz (0.205 kg)
Heaviest
1 lb 9 oz (0.71 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Test

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

Brown / sea trout European eel Bullhead Minnow Stone loach 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 →