Need Help with Mud Crabs

st.george

New Member
I have some what I believe are mud crabs. Can anyone verifiy this via pic? I also think they are breeding. One of them has what looks like a brood of little ones under its' belly. We noticed what appeared to look like a little one being carried away by the current.
I can not find any info on mud crabs and whether they are a good thing or bad. I count about 10 hiding in our oysters. Whether they have a useful fuction or not? Help ME Please anyone.
 
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