RiverFish

3-spined stickleback · Gasterosteus aculeatus

3-spined stickleback in the River Irk

Largest measured 3-spined stickleback: 8.9 cm

The largest 3-spined stickleback measured in Environment Agency surveys of the River Irk was 8.9 cm, recorded at Ikir05 on 30 April 2004.

Across 95 measured 3-spined stickleback, the median measured length was 6 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 Irk.

See 3-spined stickleback records across England →

Most recent observation26 September 2025Ikir10
Largest measured 3-spined stickleback
8.9 cm
Median length
6 cm
Fish measured
95
Survey locations
3

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
8.9 cm30 Apr 2004Ikir0579856
7.7 cm30 Apr 2004Ikir0579856
7.7 cm30 Apr 2004Ikir0579856
7.5 cm30 Apr 2004Ikir0579856
7.4 cm30 Apr 2004Ikir0579856
7 cm30 Apr 2004Ikir0579856
7 cm30 Apr 2004Ikir0579856
7 cm30 Apr 2004Ikir0579856
6.9 cm30 Apr 2004Iktr0579857
6.9 cm30 Apr 2004Ikir0579856

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
Iktr0530 Apr 200426 Sept 20253
Ikir1026 Jun 200126 Sept 20253
Ikir0530 Apr 200426 Sept 20253

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

2001–2025

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 95 measured fish were spread across different length ranges.

Smallest
3.9 cm
Lower quarter
5.5 cm
Median
6 cm
Upper quarter
6.6 cm
Largest
8.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

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 →