Invasive SpeciesEuropean shore crab

Carcinus maenas
ID Confirmed
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Field Notes
Our team went to Reid State Park to survey the green crabs, and took notes on what we found and the surrounding area. First, we did find a green crab in our quadrant, and that made us happy. We can hear the sloshing water, and all the people talking. We can also smell the ocean. We can see pine trees, seaweed covered rocks, and mud. Surprisingly we only found one crab, and it was small and not aggressive. It did take us a while to find the crab and we did have help to find it. We are all wondering how it came to be that the crab we did find only had three legs on one side and four on the other. The trip we took to Reid State Park let us find the green crab and it was a great time.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
Our team knows that the organism we found is a european green crab because it's characteristics match up with the characteristics described on our Vital Signs species card. For example, our crab has five spines on each side of the eyes.
Photo of my evidence.
Also, it has a five-sided, greenish-brown shell, and the claws were thin and had sharp tips.
Photo of my evidence.
In addition, it is no wider than 10 cm. We know that this is definitely a green crab because it has all the characteristics of a green crab.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Carcinus maenas
Common name:
European shore crab
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.784457 °
W -69.721776 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Reid State Park, bridge
Trip date: 
Thu, 2013-10-24 08:30
Town or city: 
Type of investigation: 
Species Survey
Time of low tide: 
Thu, 2013-10-24 21:14
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