RiverFish

3-spined stickleback · Gasterosteus aculeatus

3-spined stickleback in the Main River Yeo

Largest measured 3-spined stickleback: 7.7 cm

The largest 3-spined stickleback measured in Environment Agency surveys of the Main River Yeo was 7.7 cm, recorded at Over Compton on 13 July 1993.

Across 182 measured 3-spined stickleback, the median measured length was 2.8 cm.

Surveyors recorded weights for 8 3-spined stickleback. The median was 0.1 oz (0.002 kg) and the largest recorded weight was 0.2 oz (0.006 kg).

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

See 3-spined stickleback records across England →

Most recent observation30 July 2015Up Mudford Investigation Site · 79 fish
Largest measured 3-spined stickleback
7.7 cm
Median length
2.8 cm
Fish measured
182
Survey locations
18

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
7.7 cm13 Jul 1993Over Compton79842
6.5 cm16 Aug 2010Goathill Higher123676
5.8 cm10 Jul 2013Mudford137142
5.7 cm10 Jun 1993Downstream Load Bridge79895
5.5 cm30 Jul 2015Up Mudford Investigation Site145722
5.5 cm10 Jul 2013Mudford137142
5.4 cm30 Jul 2015Up Mudford Investigation Site145722
5.4 cm30 Jul 2015Up Mudford Investigation Site145722
5.4 cm30 Jul 2015Up Mudford Investigation Site145722
5.4 cm30 Jul 2015Up Mudford Investigation Site145722

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
Up Mudford Investigation Site29 Jul 201530 Jul 20152
Bradford Abbas (Te)25 Sept 201325 Sept 20131
Mudford20 Jun 200710 Jul 20132
Pibsbury Pumping Station (Te)3 Oct 20039 Jul 20136
Yeovil Bridge (Te)20 Jul 201018 Sept 20123
Goathill Lower16 Aug 201016 Aug 20101
Goathill Higher16 Aug 201016 Aug 20101
Sherborne STW21 Jul 201021 Jul 20101
Thornford14 Jul 201014 Jul 20101
Gas Works d/s Ilchester (Te)28 Oct 20039 Jun 20052
Downstream Sherborne Lake (Te)24 Aug 200424 Aug 20041
Newton Surmaville15 Jul 199315 Jul 19931
Over Compton13 Jul 199313 Jul 19931
Up Mudford8 Jul 19938 Jul 19931
Witcomb Drove30 Jun 199330 Jun 19931
Downstream Hainbury Mill23 Jun 199323 Jun 19931
Great Yard, Ilchester22 Jun 199322 Jun 19931
Downstream Load Bridge10 Jun 199310 Jun 19931

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

1993–2015

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 182 measured fish were spread across different length ranges.

Smallest
1.5 cm
Lower quarter
2.4 cm
Median
2.8 cm
Upper quarter
4 cm
Largest
7.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 8 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 oz (0.001 kg)
Median
0.1 oz (0.002 kg)
Upper quarter
0.1 oz (0.002 kg)
Heaviest
0.2 oz (0.006 kg)

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

More fish in this river

Explore the Main River Yeo

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

Gudgeon European eel Chub Roach Dace Minnow

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 →