RiverFish

3-spined stickleback · Gasterosteus aculeatus

3-spined stickleback in the River Tas

Largest measured 3-spined stickleback: 12.8 cm

The largest 3-spined stickleback measured in Environment Agency surveys of the River Tas was 12.8 cm, recorded at Downstream Forncett Street on 11 April 2005.

Across 1,577 measured 3-spined stickleback, the median measured length was 4 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 Tas.

See 3-spined stickleback records across England →

Most recent observation2 April 2026Tasburgh Mill Farm · 54 fish
Largest measured 3-spined stickleback
12.8 cm
Median length
4 cm
Fish measured
1,577
Survey locations
9

Individual EA measurements

Largest measured 3-spined stickleback

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

LengthSurvey dateSurvey locationSurvey ID
12.8 cm11 Apr 2005Downstream Forncett Street84420
8.7 cm14 Apr 2005Upstream Shotesham Park84421
7.9 cm27 May 2022Downstream Stoke Mill161829
7.4 cm12 Apr 2010Downstream Forncett Street121451
7 cm22 Apr 2013Tasburgh Mill Farm135882
6.8 cm13 Apr 2016Downstream Forncett Street148204
6.8 cm13 Apr 2016Downstream Forncett Street148204
6.7 cm1 May 2013Downstream Forncett Street135977
6.5 cm1 May 2013Downstream Forncett Street135977
6.4 cm15 Apr 2016Flordon Common148207

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

Explore the river

Where 3-spined stickleback were found

Each point marks a survey location with at least one 3-spined stickleback 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 3-spined stickleback
Tasburgh Mill Farm27 Apr 19872 Apr 202615
Flordon Common15 May 20031 Apr 202614
Downstream Stoke Mill19 Apr 20052 May 20246
Upstream Shotesham Park14 Apr 200530 Apr 20244
Markshall Bridge9 Sept 199225 Apr 20247
Downstream Forncett Street22 Apr 198719 Apr 20229
CEGB Trowse27 Apr 200527 Apr 20051
Upstream Hempnall Beck22 Apr 200522 Apr 20051
Upstream Tasburgh Hall29 Sept 19927 Apr 20054

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

1987–2026

Survey records by year

Each bar shows how many survey visits recorded 3-spined stickleback that year.

Fish measured by surveyors

Measured length distribution

See how the 1,577 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
3.5 cm
Median
4 cm
Upper quarter
4.4 cm
Largest
12.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Tas

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

European eel Stone loach Roach Bullhead Dace Pike

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 →