Crab

Discussion in 'Invertebrates' started by Neil H, 3 Mar 2009.

  1. Neil H

    Neil H Moderator MASA Contributor

    Joined:
    11 May 2008
    Posts:
    2,795
    Likes Received:
    56
    Location:
    JHB
    Hi All

    I have noticed with dismay how of all my corals, I have extreme difficulty getting Zoa's to thrive, yet all my other corals and inmates have shown really significant growth ...... I think last night i found the cause ..... after lights out i was wondering around the lounge and had a tourch close at hand, i shone the tourch into the tank and the first thing i saw was a crab..... not a small one either ... i am talking the size of two R5 coins together and snow white ..... naturally when i reaached for the camera it was gone .......

    so my questions are as follows ......

    1. could this be the cause of the demise of the Zoa's???

    2. Assuming he is the cause how do i catch him? Put a glass in the tank leaning on some rock with a tasty morsel there ..... What stops one of my shrimp falling into the glass and the crab injuring them, or woulf they be able to get out ???? what tasty morsel would best invite a zoa eating crab into the glass

    3. If i manage to catch him does anyone want him??
     
  2. AdS Guest




    to hide all adverts.
  3. dallasg

    dallasg Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,769
    Likes Received:
    582
    Location:
    Sandton
    neil, i will take him :)

    yes the glass trick or jam jar works well
     
  4. dallasg

    dallasg Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,769
    Likes Received:
    582
    Location:
    Sandton
    can use shrimp, i have some frozen shrimp if u need
     
  5. Tony

    Tony

    Joined:
    23 Aug 2008
    Posts:
    4,093
    Likes Received:
    68
    Location:
    Honeydew, Johannesburg
    PUt him in the sump. I don't trust strange crabs
     
  6. seank

    seank

    Joined:
    24 May 2007
    Posts:
    11,984
    Likes Received:
    119
    Location:
    North of Durban and South of Mozambique
    I would say no, I see a lot of crabs walking over zoas at low tides, only thing that happens is that the zoas closes up for a while. But in my tank it is a different story. I have local zoas, some opens up fully, yet some does not, and they are from the same batch. But what I have found is the ones lower down (under the shade of some soft coral) does not want to open up as well as the ones that does not get enough flow, yet the ones on top in the tank as well as the ones at the bottom that gets enough flow and no shade, are doing extremely well. Again, I cannot think of any crabs that prefers to eat zoas
     
  7. Neil H

    Neil H Thread Starter Moderator MASA Contributor

    Joined:
    11 May 2008
    Posts:
    2,795
    Likes Received:
    56
    Location:
    JHB
    thanks for the feedback guys ...

    All the same i think i will try catch the little critter and Dallas assuming i am successfull she is yours .... still looking for an answer on those clowns hey!

    If i bait the jar with some lance fish do you think it will work??

    Also i am worried that one of my shrimps will get caught in the jar or do you think that they will be able to swim out ???
     
  8. jacquesb

    jacquesb Retired Moderator

    Joined:
    29 May 2007
    Posts:
    17,868
    Likes Received:
    69
    Location:
    Cape Town
    More than correct Sean! Neil - the only "critter" that I have heard of that can "eat" zoanthids, is a certain nudibranch....

    No crab will eat the zoanthid - it has some toxins to protect itself....
     
  9. Neil H

    Neil H Thread Starter Moderator MASA Contributor

    Joined:
    11 May 2008
    Posts:
    2,795
    Likes Received:
    56
    Location:
    JHB
    would the crab pose any thret to the rest of the corals i have ?
     
  10. jacquesb

    jacquesb Retired Moderator

    Joined:
    29 May 2007
    Posts:
    17,868
    Likes Received:
    69
    Location:
    Cape Town
    It could possible start eating your leather corals. BUT, this only really starts happening when the crab reaches HUGE proportions. I have had a red legged hermit crab (the HUGE ones) that started eating away at my leather coral. I then sumped him! And traded the hermit after a while. The hermit was as big as my hand.
     
  11. dallasg

    dallasg Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,769
    Likes Received:
    582
    Location:
    Sandton
    would love them see my nano thread
     
  12. Phyrannus

    Phyrannus

    Joined:
    23 Dec 2008
    Posts:
    156
    Likes Received:
    0
    Location:
    Under the Sea
    Give it to the dallasg. He loves to eat crabs...:lol:
     
  13. Tobes

    Tobes Retired Moderator

    Joined:
    30 Nov 2007
    Posts:
    9,482
    Likes Received:
    118
    Location:
    A Beautiful place!
    Yes Neil, they can swim out ;)

    They are cleaner shrimps right?
     
  14. Neil H

    Neil H Thread Starter Moderator MASA Contributor

    Joined:
    11 May 2008
    Posts:
    2,795
    Likes Received:
    56
    Location:
    JHB
    one is a boxer the other one a fire shrimp
     
  15. Tobes

    Tobes Retired Moderator

    Joined:
    30 Nov 2007
    Posts:
    9,482
    Likes Received:
    118
    Location:
    A Beautiful place!
    OOO, don't know if they can swim as well as the common cleaners :p

    wait for the guys who know if they can to comment ;)
     
  16. dallasg

    dallasg Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,769
    Likes Received:
    582
    Location:
    Sandton
    try it at night, just after lights off, that way u can watch what happens, most crab are nocturnal
     
  17. Warr7207

    Warr7207

    Joined:
    28 Dec 2007
    Posts:
    12,781
    Likes Received:
    31
    Location:
    JHB
    The fire shrimp is a really good swimmer, but not the boxing. But the boxing probably wouldn't get stuck as he has really long "arms" unlike a crab.
     
Recent Posts

Loading...
Similar Threads - Crab Forum Date
[wtd] Halloween hermit crab Wanted 15 Oct 2016
Holloween Hermit crab Invertebrates 28 Sep 2016
[wtd] Hermit Crabs and Turbo Snails Wanted 25 Sep 2016
[wtd] Emerald crabs/ red Mithrax crabs Wanted 16 Jul 2016
Anemone Crab Invertebrates 3 Jul 2016
Emerald crab at the 11th hour? Invertebrates 23 Jun 2016
BTA hosting clowns and crabs? Anemone's 11 Jun 2016