Asian Clam - Corbicula fluminea


The outside of the shell is normally greeny-yellow with concentric rings. The colour can flake, leaving white spots. The shells are lightly purple on the inside.

Identification difficulty

A freshwater species moving through our river and canal systems

When to see it

All year round.

UK Status

An invasive species now found in the River Trent system and also the lower Thames, Medway, Great Ouse systems and one site in south Wales near Cardiff. It is likely to occupy all parts of the central English canal basin in next by the mid 2020s.

VC55 Status

Recently arrived in Leicestershire and Rutland but likely to be increasing and spreading in our area.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map