Brush-clawed shore crab

Hemigrapsus takanoi


Photo credits: ©Arjan Gittenberger; ©Hans Hillewaert
Hemigrapsus takanoi - brush-clawed shore crab
  • H. takanoi is a small crab, reaching 2.5cm in length across its square cephalothorax. It is dark in colour, ranging from greyish to greenish to brown; its legs are banded. The males have a dense tuft of yellow bristles on their claws
  • It is found in intertidal areas of mudflats, estuaries and lagoons.

Origin and Worldwide Distribution:
  • This species is found in Japan and Korea. Its wider distribution is to be yet to be confirmed as it has been distinguished from a similar species.
  • It is invasive in Belgium, France, Germany, the Netherlands, and Spain.

Potential or Known Impacts:
  • It may outcompete native crab species for food and shelter. It has a highly reproductive potential, and the ability to grow quickly. It has a broad diet, and may predate on native shellfish.

How did it/could it get here?
  • It could be spread by hull-fouling from ships or by their ballast water.
  • Planktonic larvae may be moved by water currents. Adults may be hitchhike in narrow crevices on ropes, anchor boxes or in farmed oyster boxes.

Is it found in Ireland or Northern Ireland?
  • It is not found in Ireland or Northern Ireland

Methods for Prevention:
  • Do not introduce.
  • Make sure that all equipment is cleaned before moving between different water bodies.
  • Do not move water from one water body to another.
  • Report all sightings.

You can help by reporting any sightings:

Species Related Files:

Invasive Species Ireland

Invasive Species Ireland