Invasive SpeciesAsian shore crab

Hemigrapsus sanguineus
FOUND by 101SzechuanSauc...
ID Confirmed
Quality checked by Go science
Peer reviewed by Rock crab clan
Field Notes
My group went to Reid State park to find invasive crab species at 9:00 on 10/26/17. It was very rainy so we put plastic bags over our iPads so that we would be able to take pictures. We searched around for around 1 hour and 40 minutes, but we only found green crabs. One of the interesting finds was when I lifted up a rock to see a plastic cup covered in barnacles, which a big green crab was resting inside of. I took a few pictures of it before putting it in our crab bucket. At around 9:40, (20 minutes before we left,) I was away from my group looking around in the seaweed for Asian shore crabs or Chinese mitten crabs. I lifted up a small rock to see a juvenile Asian shore crab attempting to run away to safety. I quickly grabbed it from the front, because I knew that it was too small to be able to pinch very hard. Surprisingly, nobody else found a Asian shore crab, although it is an invasive species. No one found a Chinese mitten crab either. At the end we had put nail polish on around 3/4 of the green crabs that all the groups found before releasing the green crabs, so that we could see if there were any re-catches. Surprisingly, the next team that went re-caught one of the green crabs that our team had caught!
Supporting Evidence
Photo of my evidence.
This crab has banded legs, which is one of the things that makes me think it is an Asian shore crab.
Photo of my evidence.
The crab has a square shaped shell, which is another reason that I think it is an Asian shore crab.
Photo of my evidence.
The crab also has 3 spines on each side, which is another reason that I think it is an Asian shore crab.
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
N 43.785021 °
W -69.722574 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Reid State Park river
Trip date: 
Thu, 2017-10-26 09:00
Town or city: 
Type of investigation: 
Species Survey
Time of low tide: 
Thu, 2017-10-26 10:16


Nice clear, close-up shot of the crab holding on to your fingers!