Roach · Rutilus rutilus

Roach in the Main River Chew

Largest measured roach: 33 cm

The largest roach measured in Environment Agency surveys of the Main River Chew was 33 cm, recorded at Downstream Chew Valley Lake (Te) on 8 July 2003.

Across 1,810 measured roach, the median measured length was 13.9 cm.

Surveyors recorded weights for 1,431 roach. The median was 1.9 oz (0.054 kg) and the largest recorded weight was 2 lb 11.6 oz (1.24 kg).

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

See roach records across England →

Most recent observation18 June 2025Shrowl Bridge (Te) · 33 fish

Largest measured roach: 33 cm
Median length: 13.9 cm
Fish measured: 1,810
Survey locations: 9

Individual EA measurements

Largest measured roach

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
33 cm	8 Jul 2003	Downstream Chew Valley Lake (Te)	76361
32.1 cm	13 Jul 2004	Downstream Chew Valley Lake (Te)	80875
32 cm	13 Jul 2004	Downstream Chew Valley Lake (Te)	80875
32 cm	8 Jul 2003	Downstream Chew Valley Lake (Te)	76361
31.2 cm	8 Jul 2003	Downstream Chew Valley Lake (Te)	76361
31 cm	8 Jul 2003	Downstream Chew Valley Lake (Te)	76361
30.7 cm	8 Jul 2003	Downstream Chew Valley Lake (Te)	76361
30.3 cm	13 Jul 2004	Downstream Chew Valley Lake (Te)	80875
30.2 cm	8 Jul 2003	Downstream Chew Valley Lake (Te)	76361
30 cm	13 Jul 2004	Downstream Chew Valley Lake (Te)	80875

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

Explore the river

Where roach were found

Each point marks a survey location with at least one roach 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 roach
Shrowl Bridge (Te)	12 Jul 2002	18 Jun 2025	7
Keynsham Park (Te)	3 Sept 2003	29 Jun 2023	9
Chewton Keynsham	4 Sept 2007	17 Jul 2019	3
Pensford (Te)	15 May 2002	16 Jul 2019	9
Stanton Drew (Te)	31 Aug 2005	2 Jul 2019	8
Chew Magna	5 Jul 2011	5 Jul 2011	1
Compton Dando (Te)	20 Jun 2003	10 Aug 2007	3
Downstream Chew Valley Lake (Te)	8 Jul 2003	13 Jul 2004	2
Byemills	5 Sept 2002	5 Sept 2002	1

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

2002–2025

Survey records by year

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

302

503

404

405

506

507

208

109

010

211

112

213

114

015

216

017

018

419

020

021

022

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 1,810 measured fish were spread across different length ranges.

Smallest: 1.2 cm
Lower quarter: 10.5 cm
Median: 14 cm
Upper quarter: 19.5 cm
Largest: 33 cm

0–99 mm

356

100–199 mm

1046

200–299 mm

398

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 1,431 roach. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.7 oz (0.021 kg)
Median: 1.9 oz (0.054 kg)
Upper quarter: 5.3 oz (0.15 kg)
Heaviest: 2 lb 11.6 oz (1.24 kg)

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

More fish in this river

Explore the Main River Chew

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

Bullhead Minnow Stone loach Brown / sea trout European eel Gudgeon

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 →