Killer Shrimp, Dikerogammarus villosus

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Alert Species

Please report any sightings as soon as possible.

Overview

Short description of Dikerogammarus villosus, Killer Shrimp

Adults are up to 30mm in length. The body is curled and semi-transparent. They have two pairs of antennae and large, powerful mandibles. Newly hatched young are about 1.8mm in length and resemble adults.

Description of Dikerogammarus villosus, Killer Shrimp status in GB

There are three known established infestations of killer shrimps in Grafham Water, Cambridgeshire, and Cardiff Bay and Eglwys Nunydd, Wales, with potential to spread rapidly if not contained.

Habitat summary: Dikerogammarus villosus, Killer Shrimp

While currently restricted, there are large areas of GB’s canals, rivers and lakes that would provide suitable habitat for the species. They require hard banks, slow flowing water and are salt tolerant so can also colonise brackish coastal habitats.

Overview table

Environment: Freshwater
Species status: Non-Native
Native range: Russian Far East, Caucasus, Russia South, Ukraine
Functional type: Predator
Status in England: Non-Native
Status in Wales: Non-Native
Location of first record: Grafham Water reservoir, Cambridgeshire
Date of first record: 2010

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