RiverFish

Stone loach · Barbatula barbatula

Stone loach in the Alleviation of Low Flow (ALF) study

Largest measured stone loach: 12.4 cm

The largest stone loach measured in Environment Agency surveys of the Alleviation of Low Flow (ALF) study was 12.4 cm, recorded at Gerrards Cross STW on 12 May 1999.

Across 142 measured stone loach, the median measured length was 7.8 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Alleviation of Low Flow (ALF) study.

See stone loach records across England →

Most recent observation7 November 2000Denham Country Park · 3 fish
Largest measured stone loach
12.4 cm
Median length
7.8 cm
Fish measured
142
Survey locations
3

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
12.4 cm12 May 1999Gerrards Cross STW126116
11.5 cm12 May 1999Gerrards Cross STW126116
11.2 cm12 May 1999Gerrards Cross STW126116
10.8 cm12 May 1999Gerrards Cross STW126116
10.7 cm12 May 1999Gerrards Cross STW126116
10.5 cm12 May 1999Gerrards Cross STW126116
10.5 cm12 May 1999Gerrards Cross STW126116
10.4 cm12 May 1999Gerrards Cross STW126116
10.1 cm12 May 1999Gerrards Cross STW126116
10.1 cm12 May 1999Gerrards Cross STW126116

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
Denham Country Park6 May 19997 Nov 20003
Isle of Wight Farm24 Oct 200024 Oct 20001
Gerrards Cross STW12 May 199912 May 19991

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

1999–2000

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 142 measured fish were spread across different length ranges.

Smallest
4 cm
Lower quarter
6.5 cm
Median
7.9 cm
Upper quarter
9.2 cm
Largest
12.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Alleviation of Low Flow (ALF) study

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

Bullhead 3-spined stickleback

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 →