RiverFish

3-spined stickleback · Gasterosteus aculeatus

3-spined stickleback in the River Medlock

Largest measured 3-spined stickleback: 10.1 cm

The largest 3-spined stickleback measured in Environment Agency surveys of the River Medlock was 10.1 cm, recorded at Mdme20 on 17 June 2003.

Across 204 measured 3-spined stickleback, the median measured length was 5.1 cm.

Surveyors recorded weights for 2 3-spined stickleback. The median was 0.1 oz (0.0025 kg) and the largest recorded weight was 0.1 oz (0.004 kg).

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

See 3-spined stickleback records across England →

Most recent observation1 June 2023Mdme31
Largest measured 3-spined stickleback
10.1 cm
Median length
5.1 cm
Fish measured
204
Survey locations
10

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
10.1 cm17 Jun 2003Mdme2076165
9.8 cm25 May 2004Mdme1081352
8.5 cm17 Jun 2003Mdme2076165
8.2 cm17 Jun 2003Mdme2076165
8.1 cm17 Jun 2003Mdme2576166
8 cm17 Jun 2003Mdme2576166
7.9 cm17 Jun 2003Mdme2076165
7.6 cm27 May 2004Mdme2581357
7.5 cm26 May 2004Mdme1581355
7.5 cm17 Jun 2003Mdme2076165

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
Mdme311 Jun 20231 Jun 20231
Mdme2631 May 202331 May 20231
Mdme152 Oct 199530 May 20238
Mdme2025 Sept 200224 May 20137
Mdme3019 Apr 201319 Apr 20131
Mdme22.518 Apr 201318 Apr 20131
Mdme2525 Sept 200225 Apr 20065
Mdme1010 Aug 200124 Apr 20066
Mdme0521 Aug 200119 May 20055
Mdme17.521 Aug 200119 Jun 20022

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

1995–2023

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 204 measured fish were spread across different length ranges.

Smallest
3 cm
Lower quarter
4.6 cm
Median
5.1 cm
Upper quarter
5.6 cm
Largest
10.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 2 3-spined stickleback. This is a subset of the measured fish and may not represent the whole population.

Lightest
0 oz (0.001 kg)
Lower quarter
0.1 oz (0.0018 kg)
Median
0.1 oz (0.0025 kg)
Upper quarter
0.1 oz (0.0032 kg)
Heaviest
0.1 oz (0.004 kg)

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

More fish in this river

Explore the River Medlock

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

Brown / sea trout Stone loach Minnow Chub Perch Roach

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 →