Invasive SpeciesAsian shore crab

Hemigrapsus sanguineus
FOUND by quabbys1
2015-10-20
Cape Elizabeth
ID Confirmed
Quality checked by Dk
Peer reviewed by Pp
Field Notes
The first day my partner and I went it was sunny and the temperature was cool. It had a touch of wind to the rain. Surprisingly the crabs were easy to find, all you had to do was lift up a rock or two and a crab was there. On the second day we went it was drizzling just a bit. There were lots of clouds moving way faster than they should of because of the wind. On the second day it was harder to find crabs, we had to lift up really heavy rocks to get to them. The crab we found was missing one claw and one leg, I was wondering what could have happened and what the crab and what it had been through? We found the Asian shore crab in a tide pool near some seaweed. There is a dog walking on the pavement above the beach. Shrimp were crawling under rocks, and the crabs tried to pinch you. The waves crashing on the sand, people are talking, and birds are chirping way to loud. An awful smell of seaweed with the cold, not so fresh, salty air. The oil of boats and cars tried over masking the stank of the seaweed and salty air but all it did was mix together and create a horrible stench. I'm surprised because I thought it would be harder to find an Asian Shore Crab, but it was easy because they are invasive and almost everywhere you look there are at least one hiding under rocks and seaweed. One problem that we ran into was how cold the water was, but we decided to use rocks to move the seaweed and other smaller rocks. Another problem was that the crab kept pinching our hands, you most likely wouldn't leave without a mark.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
It states in the vital signs ID card that the Asian Shore Crab has a reddish claw with black dots. This photo clearly shows that our crab's claw is reddish and has bright red to black dots. The vital signs ID card also states that the Asian shore crab has a fleshy bulb in the middle of its claw, not to be confused by the hairy-clawed shore crab which has a hairy ruffle in the same spot.
Photo of my evidence.
It states in the vital signs ID card that Asian Shore Crabs have black and white stripes on its legs. The crab we found has the same alternating black and white stripes. Also, the Asian Shore Crab has tiny little spikes starting from the tip of the point of the leg. We know this is Asian Shore because no other crabs in Maine have stripes on their legs.
Photo of my evidence.
It states in the ID card that the Asian Shore Crab has 3 ridges on its shell, right behind its eye. The crab we we found also had 3 ridges behind each eye. The hairy shore crab also has 3 spines, but we know this is an Asian Shore Crab because it's claws have a fleshy bulb instead of a hairy tuft.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Hemigrapsus sanguineus
Common name:
Asian shore crab
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
Latitude: 
N 43.560366 °
Longitude: 
W -70.217659 °
Observation Site Information
A photo of our study site.
Habitat: 
Coastal - Rocky intertidal
Trip Information
Name:
Kettle Cove (P72015)
Trip date: 
Tue, 2015-10-20 12:15
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Ecosystem: 
Coastal
Watershed: 
Presumpscot
Time of low tide: 
Tue, 2015-10-20 10:35

Comments

I love the clear, close-up photos!