RiverFish

Sea lamprey · Petromyzon marinus

Sea lamprey in the River Ouse

Largest measured sea lamprey: 73 cm

The largest sea lamprey measured in Environment Agency surveys of the River Ouse was 73 cm, recorded at Naburn Weir (single anode) on 15 July 2014.

This is the only individual sea lamprey length in the dataset for this river.

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

See sea lamprey records across England →

Most recent observation15 July 2014Naburn Weir (single anode) · 1 fish
Largest measured sea lamprey
73 cm
Length sample
1 fish
Survey records
5
Survey locations
1

Individual EA measurements

Largest measured sea lamprey

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

LengthSurvey dateSurvey locationSurvey ID
73 cm15 Jul 2014Naburn Weir (single anode)141739

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

Explore the river

Where sea lamprey were found

Each point marks a survey location with at least one sea lamprey 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 sea lamprey
Naburn Weir (single anode)21 Jul 200015 Jul 20145

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

2000–2014

Survey records by year

Each bar shows how many survey visits recorded sea lamprey that year.

Fish measured by surveyors

Recorded length

One individual length was recorded for this fish and river.

Recorded length
73 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ouse

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

Roach Perch Gudgeon Ruffe Bleak 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 →