RiverFish

Stone loach · Barbatula barbatula

Stone loach in the River Derwent

Largest measured stone loach: 11.2 cm

The largest stone loach measured in Environment Agency surveys of the River Derwent was 11.2 cm, recorded at River Derwent at Allensford on 9 August 2009.

Across 99 measured stone loach, the median measured length was 7.9 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 Derwent.

See stone loach records across England →

Most recent observation15 July 2025River Derwent at Rowlands Gill
Largest measured stone loach
11.2 cm
Median length
7.9 cm
Fish measured
99
Survey locations
14

Individual EA measurements

Largest measured stone loach

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

LengthSurvey dateSurvey locationSurvey ID
11.2 cm9 Aug 2009River Derwent at Allensford120337
11.1 cm9 Aug 2009River Derwent at Allensford120337
11.1 cm21 Aug 2007River Derwent at Rowlands Gill107188
10.8 cm9 Aug 2009River Derwent at Allensford120337
10.8 cm21 Aug 2007River Derwent at Rowlands Gill107188
10.7 cm17 Jul 2008River Derwent at Allensford114874
10.5 cm26 Aug 2007River Derwent at Blanchland107147
10.4 cm21 Aug 2007River Derwent at Rowlands Gill107188
10.4 cm21 Aug 2007River Derwent at Rowlands Gill107188
10.4 cm21 Aug 2007River Derwent at Rowlands Gill107188

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

Explore the river

Where stone loach were found

Each point marks a survey location with at least one stone loach 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 stone loach
River Derwent at Rowlands Gill21 Aug 200715 Jul 20259
River Derwent at Clockburn27 Sept 200515 Jul 20255
River Derwent at Shotley Bridge14 Aug 200714 Jul 20257
River Derwent at Cricket Club6 Sept 201914 Jul 20252
River Derwent at Ruffside Picnic Site27 Sept 200411 Jul 20258
River Derwent at Eddy's Bridge28 Aug 200711 Jul 20253
River Derwent at Crooked Oak21 Sept 200611 Jul 20254
River Derwent at Allensford27 Sept 200430 Jun 202311
River Derwent at Blackhall Mill9 Aug 20099 Sept 20196
River Derwent at Ebchester6 Sept 20196 Sept 20191
River Derwent at Hag Hill27 Aug 200718 Aug 20177
River Derwent at Lintzford2 Aug 201317 Aug 20175
River Derwent at Ebchester Bridge26 Sept 201526 Sept 20151
River Derwent at Blanchland27 Sept 200413 Sept 20093

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

2004–2025

Survey records by year

Each bar shows how many survey visits recorded stone loach that year.

Fish measured by surveyors

Measured length distribution

See how the 99 measured fish were spread across different length ranges.

Smallest
3 cm
Lower quarter
7.4 cm
Median
7.9 cm
Upper quarter
8.9 cm
Largest
11.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent

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

Brown / sea trout Minnow Bullhead European eel Atlantic salmon Grayling

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 →