Asian Shore Crab

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How to Identify

Asian Shore Crabs are relatively small, about an inch and a half long, with light and dark bands on its legs. The body color can vary from a light to dark 

About

The Asian Shore Crab is indigenous to Western Pacific Ocean but was first observed in New Jersey in 1988. The species' habitat range has continually grown along the east coast from Maine to North Carolina and typically prefer inter-tidal habitats with many rocks for shelter. Like other invasive species, the crab is not a picky eater, so it out competes the native crab species. They typically feed on algae and salt-marsh grasses, but will also feed on larvae, small fish, and small invertebrates as they are omnivores. 

Effects

Long Term:

  • Rocky inter-tidal communities suffer
  • Reduced biodiversity

Short Term:

  • Predation pressures
  • Threat to native species

Potential Ways to Reduce:

  • Prevent the spread through ballast water and other sea transportation methods
  • Mitigate through removal processes like eating them or using them as bait

Green Crab

About

Green Crabs, are indigenous to Europe and Northern Africa and was first discovered in America in the early 1800's.  The species has spread across the east and west coasts of North America as well as other areas around the world. Their habitats consist of  semi-protected areas such as rocks, mud, sand, and submerged vegetation. The Green Crab is a predator, so they typically feed on bivalve molluscs and other small crustaceans. 

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How to Identify

Green Crabs are medium sized at 2.5 to 4 inches long. The top of the crab is typically green or brown colored. The most identifiable characteristic are the symmetric spikes near the eyes.

Effects

Short Term:

  • Reduced habitats
  • Threat to native species

Long Term:

  • Ecosystems suffer
  • Reduced biodiversity

 

 

 

Potential Ways to Reduce:

  • Prevent the spread through ballast water and other sea transportation methods
  • Mitigate through removal processes like trapping and eating them