Wow, quite the hitchhiker

Discussion in 'Tridacnid and Inverts Forum' started by tomte25, Dec 31, 2017.

  1. tomte25

    tomte25 Junior Member
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    FBB83955-10F0-406F-9BA2-A5FF30C1DA4E.jpeg
    Ok, I got quite the surprise tonight. This guy came out of wherever he was hiding. He’s probably twice the size of an emerald crab I’d say. And I didn’t add him. Haven’t tried to ID him yet. He’s quite a bubbly shape crab of some variety. I haven’t added that large of a rock that he could have hidden in I don’t think. My rock all went through an acid bath before curing it. Could he have grow this large in just under a year? I’ve seen some really small dead ones kind of like this while vacuuming my sand. But if he came with my live sand, could he really have grown this size?
     
  2. OP
    tomte25

    tomte25 Junior Member
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    Thinking more about this, could this really be an emerald crab. It is more brown and mottled. The shell seems smoother on top and overall more height/rounded. I did have one emerald that I was sure had died. But maybe I saw a molting.
     
  3. Jimmy 4.1

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    If the claws are sharp and black tipped, it may be a rock crab. I would put it in your sump, or kill it if it is a rock crab.
     
  4. RSnodgrass

    RSnodgrass TCMAS President
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    Emeralds have the red joints on the inside of their 'elbow' on the primary claws. Other types probably do as well but it's a start.

    The claw tips on an emerald are also like scoops. The shape of the claw can sometimes indicate if it's a problem or not.
     
  5. Jimmy 4.1

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    It almost looks like a shame faced crab, but I'm no crab expert.
     
  6. Fishfoo

    Fishfoo Junior Member
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    Possibly a black fingered mud crab? Would need better pics
     
  7. OP
    tomte25

    tomte25 Junior Member
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    62EC2146-ECCB-4A25-AEF3-B5A5C391E669.jpeg Hmm hard to catch him. This pic may give a better indication. The spotted/mottled appearance and claw.
     
  8. Fishfoo

    Fishfoo Junior Member
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    Look like some type of Xanthid crab, although that doesn't narrow it down much. Crabs are omnivorous with a strong tendency to be carnivores. If the opportunity arises, there's a good chance it could make a meal of a small fish or some LPS. It's completely up to you if you want to keep it or not. My only recommendation would be not to cook and eat it as Xanthid crabs are posionous :)
     
  9. OP
    tomte25

    tomte25 Junior Member
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    I finally managed to capture this bugger! But I think I lost some acans to him not to mention pieces of my GSP floating around my tank many mornings.

    Now I just need to get serious about manual removal of some plague proportions of bubble algae. You folks with clean tanks are to be admired.
     

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