Chub · Leuciscus cephalus

Chub in the River Blackwater

Largest measured chub: 51.2 cm

The largest chub measured in Environment Agency surveys of the River Blackwater was 51.2 cm, recorded at Riseley on 20 April 2010.

Across 1,032 measured chub, the median measured length was 28.9 cm.

Surveyors recorded weights for 10 chub. The median was 1 lb 3.6 oz (0.5565 kg) and the largest recorded weight was 1 lb 14.6 oz (0.868 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 Blackwater.

See chub records across England →

Most recent observation6 May 2026Coleford Bridge · 2 fish

Largest measured chub: 51.2 cm
Median length: 28.9 cm
Fish measured: 1,032
Survey locations: 24

Individual EA measurements

Largest measured chub

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

Length	Survey date	Survey location	Survey ID
51.2 cm	20 Apr 2010	Riseley	121416
50.5 cm	7 Apr 2009	Hawley Meadows	117156
50.4 cm	20 Apr 2010	Riseley	121416
49.7 cm	12 May 2008	Riseley	110987
49.2 cm	8 Apr 2025	Riseley	176231
49.1 cm	3 Apr 2009	Riseley	117160
48.9 cm	26 Apr 2022	Riseley	160914
48.9 cm	12 May 2008	Riseley	110987
48.6 cm	12 May 2008	Riseley	110987
48.5 cm	21 Apr 2016	Hawley Meadows	147952

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

Explore the river

Where chub were found

Each point marks a survey location with at least one chub 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 surveyed	First recorded	Last recorded	Visits finding chub
Coleford Bridge	21 Mar 2003	6 May 2026	5
Hawley Meadows	5 Dec 1990	10 Apr 2025	17
Riseley	4 Apr 2002	8 Apr 2025	13
Manor Farm Nature reserve	8 Apr 2025	8 Apr 2025	1
Downstream Riseley	23 Sept 1985	22 May 2013	3
Eversley Cross	7 Dec 1990	10 Apr 2013	9
Hollybush Lane	16 Apr 2003	16 Apr 2003	1
Aldershot	9 Apr 2003	9 Apr 2003	1
Church Farm	3 Apr 2003	3 Apr 2003	1
Owlsmoor	10 Oct 1985	27 Mar 2003	3
Greenacres	27 Sept 1985	29 Jan 1991	2
RAE Riseley	24 Sept 1985	23 Jan 1991	2
Downstream Lakeside road	19 Dec 1990	19 Dec 1990	1
Downstream Sandhurst Lane	18 Dec 1990	18 Dec 1990	1
Upstream Cove Brook	3 Dec 1990	3 Dec 1990	1
Upstream A325 Frimley	30 Nov 1990	30 Nov 1990	1
Downstream Coleford bridge	29 Nov 1990	29 Nov 1990	1
Grove Farm	23 Nov 1990	23 Nov 1990	1
0.5km Upstream Coleford bridge	17 Oct 1985	17 Oct 1985	1
Upstream Loddon	2 Oct 1985	2 Oct 1985	1
Eversley Trout Fishery	30 Sept 1985	30 Sept 1985	1
Downstream Greenacres	27 Sept 1985	27 Sept 1985	1
Downstream Whitewater confluence	24 Sept 1985	24 Sept 1985	1
300m Upstream Swallowfield G/S	23 Sept 1985	23 Sept 1985	1

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

1985–2026

Survey records by year

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

1085

086

087

088

089

990

391

092

093

094

095

096

097

098

099

000

101

302

803

304

305

306

307

208

209

410

011

112

413

014

015

316

017

018

219

020

021

222

023

024

325

126

Fish measured by surveyors

Measured length distribution

See how the 1,032 measured fish were spread across different length ranges.

Smallest: 3.2 cm
Lower quarter: 13.8 cm
Median: 28.9 cm
Upper quarter: 38.5 cm
Largest: 51.2 cm

0–99 mm

160

100–199 mm

223

200–299 mm

154

300–399 mm

297

400–499 mm

195

500–599 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 10 chub. This is a subset of the measured fish and may not represent the whole population.

Lightest: 3.7 oz (0.104 kg)
Lower quarter: 12.7 oz (0.3608 kg)
Median: 1 lb 3.6 oz (0.5565 kg)
Upper quarter: 1 lb 12.2 oz (0.7995 kg)
Heaviest: 1 lb 14.6 oz (0.868 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 Blackwater

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

Roach Gudgeon Pike Dace Perch Tench

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 →