Crabs - problem or not?

Discussion in 'Invertebrates' started by PeterL, 14 Apr 2010.

  1. PeterL

    PeterL

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    I noticed some of those little hairy crabs some time ago which came with some LR, that didn't last long as they sort of disappeared...

    I now have another concern, I switched on the light last night to just have a look at something and saw a light brown crab about the size of a R1 coin, never seen it before and no chance of a photo because it was super quick in ducking into one of the rocks - so it is clearly a nocternal fella. I don't see obvious signs of dammage other than hollowing out my rocks - to what degree I wouldn't know for sure but there is some debris on and around his little hole.

    Would this crab be a problem?
    Should I look at trying to remove it and if so - how?
     
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  3. RiaanP

    RiaanP Moderator

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    yea, remove it, sump him, until you can find another home. Else do like that kiddies movie - "Flushed Away"
     
  4. Jacojs

    Jacojs

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    Agga Shame Man!!
     
  5. PeterL

    PeterL Thread Starter

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    I would love to sump him but like my piece of rock, how do I get it out the rock without a 4pound hammer or a skewer stick?
     
  6. Neil H

    Neil H Moderator MASA Contributor

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    easy ZC,

    the trick is to bait the crab just before lights out , get a smooth sided glass, a beer glass will be fine or a whiskey glass, lean it against the rock where you think the crab lives at a 70 deg angle .... theory is the crab goes in for the bait and cant climb out the smooth sides of the glass take him out the next day !!
     
  7. PeterL

    PeterL Thread Starter

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    I have read that somewhere before but have been challenged with that - how do you bait for the crab and keep the fish from eating the "bait"
     
  8. Neil H

    Neil H Moderator MASA Contributor

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    just a oece of hake
    do it after feeding time or put the glass in and only bait it 2 or 3 hours after lights out .... trust me this really works well !!
     
  9. PeterL

    PeterL Thread Starter

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    I will give it a go and see what happens, I have a whiskey glass just perfect for the application - well curved and ready for the catch...
     
  10. Neil H

    Neil H Moderator MASA Contributor

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    keep us posted !
     
  11. PeterL

    PeterL Thread Starter

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    HAHAHA!!!
    The stupid hermit crab found himself jammed up for the night in a glass with a teddy...

    That glass story worked well, I used regular fish food because I didn't have hake, but with the fish all sleeping and being in a glass, they didn't show any attention to it and I caught what I targeted - awesome. He has been sumped and after giving it the eyeball this morning it was looking very upset that I had taken it away from it's rock...

    I will do that again tonight because I see debris lying on the floor in the middle of my tank but I have no clue what is doing that, what ever it is, has to be a fair size "thingy" because of the size of the parts of rock being broken out in the tunneling process...I will keep posting if there is any more catches.

    I have wanted to nab that teddy for about a month already...:slayer:
     
  12. Neil H

    Neil H Moderator MASA Contributor

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    :thumbup: :thumbup: :thumbup: :thumbup:

    told u it would work !!!
     
  13. PeterL

    PeterL Thread Starter

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    Sorry for my sceptasism but I really didn't see how the fish would leave the food alone, after you told me about doing it "after dark" - the penny suddenly dropped for me...I am chuffed, thanks for the advice
     
  14. andries

    andries

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    Nyc Work:thumbup: Can you possibly take a picture of where he actually digged his way in?
     
  15. PeterL

    PeterL Thread Starter

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    I will, how he got into the rock initiall I cant be certain, it is a tunnel dug into the side of a flat top rock and a hole leding to the tunnel in the middle and then leading right out the bak - but other than digging tunnels into the rocks, what do the Teddy crabs do.

    The advice is to remove them, but that is it that they do inside the DT which is detrimental to the tank or it's inhabitants?
     
  16. Neil H

    Neil H Moderator MASA Contributor

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    prob came in as a tiny crab on some live rock.

    Depending on the type they are known to eat corals (i had one white out my zoa's) and even eat fish when the fish are sleeping
     
  17. PeterL

    PeterL Thread Starter

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    That is no good, so far in my case, it has just been tunneling - but it could have just been it's way of slowly orchastrating it's plan util it could go out and do the dammage...LOL

    I am hoping that it is just the one of them but I will set traps over the next few days and see if anything else gets caught...
     
  18. andries

    andries

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    Sounds like he tried to orcastrat an evil plan:nono:
     
  19. PeterL

    PeterL Thread Starter

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    LOL - "Dr.Evil" is a gonner killkanga
     
  20. PeterL

    PeterL Thread Starter

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    As promised, here is the pic of the little "trap".
    I got the hermit too but the "catch" is to the left of it - a little difficult to see because I took the pic with my phone so zooming and focus isn't great...

    [​IMG]
     
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