1. Insolent invaders

2. Slitherin' snakeheads

3. Got crabs?

4. Super swine

5. Too many blooms

6. Bogus buckthorn

7. Argentine ants

8. Weed of a 1,000 leaves

9. Weed-beater success story


The Asian shore crab is threatening shellfish from Maine to North Carolina. It's spread fast since 1988. USGS


Wanted dead, not alive INVADING SPECIES Asian shore crab (Hemigrapsus sanguineus) Alias Japanese shore crab, Pacific shore crab: Mottled purplish-brown and yellow, the crab has a squarish body andshort legs.


Native to the western North Pacific Ocean, this crab reached New Jersey in 1988, probably in ship ballast water. Has now reached from Maine to North Carolina. Carapace (body shell) is about 1.5 inches (35mm) across, squarish and mottled green, purple or brown. Grows in intertidal zone, hides under rocks, preys on native shellfish.



Clawed and considered aggressive. Could displace existing crab population. May outcompete lobsters, mussels and crabs. Report crab sightings here.


More information


Call this invader a real pig.



  The Why Files  

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