Is this crab Zoisimus aenus?

Discussion in 'ID Needed' started by Mc, 4 Jan 2013.

  1. Mc

    Mc

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    I have had this crab amoung others in my tank for a while, He is a lot bigger than the other crabs about 60mm long, also he is not quite as shy as the others but he still only comes out at night most of the time.
    As you can see in the pic he is eating hair algae off the back wall, I have also lost a few zoas recently and am not sure if he is too blame.

    Let me know if you think he is Zoisimus aenus and also if you have had these crabs before. They are supposed to be highly toxic.


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  3. irie ivan

    irie ivan MASA Contributor

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    Very much looks like one...
     
  4. belindamotion

    belindamotion Google Master

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    When you eat the meat...as I understand it..can't elaborate whether "toxic" also refers to being bitten by them as I don't have Crabs in my Tank so my knowledge is basically limited to ID'ing only..:blush:
    http://cookislands.bishopmuseum.org/species.asp?id=7889
     
  5. carlosdeandrade

    carlosdeandrade

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    Yip, only if flesh is eaten. There is no Decapod that carry's venom via a venom duct to any of it's appendage.
     
  6. Lord_Blackadder

    Lord_Blackadder

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    Yes, correct ID...have seen these on Vetchies before. Contains the same toxin as puffers (tetrodotoxin), so probably not a good idea to eat it.

    They are xanthids though, which are usually very predatory. Probably not something you want in your tank.
     
  7. carlosdeandrade

    carlosdeandrade

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    But, it is a pretty boy. I love crabs, good or bad, but rather out in their natural environment.
     
  8. Mc

    Mc Thread Starter

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    According to wikipedia that toxin can be aborbed through cuts, or inhalation as well.

    @Lord Blackadder I see they come from that area I have been to vetchies, but never really noticed them.

    I agree very pretty crab and would be sad to get rid of it, problem is I don't really have a sump.
    From the info I could find on him he is more of a threat to inverts then fish, but I wouldn't put it past him. Although he has been in my tank for at least six months and hasn't eaten any fish yet.
     
  9. Lord_Blackadder

    Lord_Blackadder

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    Yeah most xanthids are a bit slow for fish catching. They do eat snails, tubeworms and other crustaceans and would probably have a go at small Tridacna. Had one that ripped a brain coral open to get at a piece of food too.
     
  10. Mc

    Mc Thread Starter

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    I will keep an eye on him.
    I have tried to catch him but have been unsuccessful so far.
     
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