Invasive SpeciesGreen crab

Carcinus maenas
FOUND by TeamSeaTurtleLS
2015-10-05
Falmouth
ID Confirmed
Quality checked by Ms H
Peer reviewed by NR
Field Notes
Where we were was very rocky and when it's high tide, the ocean water covers our site. We noticed that when we first started looking, we mostly found Green Crabs. But after a while we then started to find the Asian Shore Crabs. We found about an equal amount of both crabs, but we did not fine any native crabs at all which shows how overpowering the invasive crabs are versus the native crabs.
Supporting Evidence
Photo of my evidence.
The Green Crab has 5 spikes on both sides of the shell right by the eyes.
Photo of my evidence.
The shell on the Green Crab is pentagon shaped.
Photo of my evidence.
The Green Crab has thin, pointy, sharp claws.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Carcinus maenas
Common name:
Green crab
Is it alive?: 
All alive
Count of individuals: 
10-20
Coverage: 
Reproduction: 
Eggs (animals)
How big is it?: 
2 - 5 cm
Is it male or female?: 
Female
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
Latitude: 
N 43.732240 °
Longitude: 
W -70.204469 °
Observation Site Information
A photo of our study site.
Habitat: 
Coastal - Rocky intertidal
Trip Information
Name:
Falmouth Town Landing 2015
Trip date: 
Mon, 2015-10-05 14:08
Town or city: 
Falmouth
Type of investigation: 
Species and Habitat Survey
Ecosystem: 
Coastal
Watershed: 
Presumpscot
Time of low tide: 
Mon, 2015-10-05 11:34
Habitat Observations
Species diversity: 
7 different species
Evidence of vectors: 
Boat ramp
Boats
Paved road
People
Water temperature: 
13.7°C
pH: 
7.8
Dissolved oxygen: 
7.8mg/L
Salinity: 
32.0ppt

Comments

I agree! Great close-up shot!

That first photo is absolutely fantastic! Great shot of the spine counts,
-MB