Bimac size and feeding question.

Discussion in 'Octopus Care' started by Backs, Apr 9, 2008.

  1. Backs

    Backs Larval Mass Registered

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    I've been setting up a salt water tank fairly slowly but this Friday I'm going to have the last of the live rock I wanted to buy for it (i'm getting 90lbs total) and am going to leave my tank to cycle until the summer before I put anything in it. It's a 75 gallon which I have read is more than big enough for a bimac which I hear most people keep in 50 gallons, but I still have some uncertainties about this Octopus. From what I've read, the Bimac can have a mantle length of up between 5-7 inches and 23 inch tentacles, but from the pictures and different posts I have read I've never seen one that looked to even be close to that big to me. I've heard many things on these particular octopuses and I've heard of many people having them be 7 months old and only having a mantle the size of a golf ball which comes nowhere close to 5 inches let alone 7. Do Bimacs actually get this large or are some of these smaller octopuses not actually Bimacs or what? This leads to my further question about feeding a full grown bimac if they get as large as I've read that they do. I have no problem having a supply of some small fiddler crabs and have a 20 gallon that I'd keep them in and can keep filtered between feedings, but most fiddler crabs I've seen are maybe 2 inches long at the max, so I don't see how a full grown bimac could make a meal out of such small crabs. Do bimacs just not get as large as I read or do you just have to feed them larger things than fiddler crabs eventually? Thanks
     
  2. L8 2 RISE

    L8 2 RISE Haliphron Atlanticus Registered

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    Keep in mind that octopuses dont have bones, so they can stretch quite a bit, 23 inches arm legnth is probably about ttwice the size of their arms on a normal day, I also think those dimensions might be a bit bigger, but an octopus of that size could probably become as small as a softball. Bimacs are currently very hard to get, however you can get some very similar species quite easily, such as hummiliniki(sp?) and abdolfus(major sp?). Any octopus that you can keep in a tank of that size will be able to "make a meal" out of a fiddler crab.
     
  3. Animal Mother

    Animal Mother Architeuthis Supporter

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    There are two different bimacs, O. bimaculoides and O. bimaculatus.

    O. bimaculatus supposedly grows considerably larger than the other. Either way it would be fine in a 75. You have to consider that in captivity their diet is going to be different, water conditions are going to be different, etc. So, they may never reach their potential size. Not to mention the weaker of the babies are going to be weeded out in the ocean, whereas a "runt" may live out its full lifespan in a tank without predators and a steady supply of food, no competition.
     
  4. L8 2 RISE

    L8 2 RISE Haliphron Atlanticus Registered

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    AM, which bimac do people prefer? Which one is more "personable" what are the pros and cons of each, or are they pretty much the same?
     
  5. Animal Mother

    Animal Mother Architeuthis Supporter

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    The main difference from everything I've read is that O. bimaculoides is a large egged species so the babies are relatively easy to raise and the other is a small egged species. Other than that, it's practically impossible to tell the difference between the two. I'd have to say from my observations of others journals on here that every species of octopus is going to have its share of personable and antisocial individuals. My mercatoris for example was VERY shy, secretive, and never cared much for my presence. On the other hand, Dwhatley's group of mercatoris' all have different dispositions. Abdopus aculeatus has a reputation for being very day active and interactive, but the one I kept was very shy and only came out to hunt when no one was around.

    I think people probably prefer whatever they can get their hands on. Neither of the two bimac species seem to be readily available. Anyone who insists that the only species they want to try is a bimac should just wait for someone on here to announce captive-bred ones. Otherwise ordering a "CB bimac" online is a gamble.
     
  6. Faaborg

    Faaborg O. bimaculoides Registered

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    Is anyone in the forum currently raising Bimac for sale or another species that is similar? I am setting up my tank now and I am looking for one for late August early September?
     
  7. daddysquoc

    daddysquoc Wonderpus Registered

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    cant say i am, but from my experiences, bimaculoides are more friendly than bimaculatus
     
  8. Faaborg

    Faaborg O. bimaculoides Registered

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    octo w/o chiller?

    Do you know if there are any species of small to mediums that DO NOT require a chiller? I am trying to find a way around getting one.:octopus::fingerscrossed:
     
  9. fishkid6692

    fishkid6692 Vampyroteuthis Supporter

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    hummelinicki. they are diurnal and mine was interactive. or you could try a. aculeatus. my a. aculeatus is more interactive than my hummelincki.
     
  10. Faaborg

    Faaborg O. bimaculoides Registered

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    Thanks !
    Do what temps do they like? (either) and what size aquarium do you have them in?
     
  11. fishkid6692

    fishkid6692 Vampyroteuthis Supporter

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    i have my a. aculeatus in a 20g. and my hummelincki was in a 40g. i had the temp. set for 78 on both the tanks.
     
  12. Faaborg

    Faaborg O. bimaculoides Registered

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    YAAAAA ! That will be perfect for me. Do you have any pics of your posted on this site?
     
  13. fishkid6692

    fishkid6692 Vampyroteuthis Supporter

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    o btw if you have a 75g you could try a briareus
     
  14. Faaborg

    Faaborg O. bimaculoides Registered

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    Will that be okay without a chiller as well?
     
  15. Animal Mother

    Animal Mother Architeuthis Supporter

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    Yes, a briareus is a Caribbean species.
     
  16. fishkid6692

    fishkid6692 Vampyroteuthis Supporter

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    yea i have a few pics of my hummelincki but i it was in a thread from a while ago. you could look in the journals section and there is a few people that have pics of there hummelincki, aculeatus, briareus, ETC.
     
  17. Faaborg

    Faaborg O. bimaculoides Registered

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    Okay help me decide; I would like a species that will live at least 1 year ( more would be great), one that I do not need a chiller for, 75 gallon okay, and one without venom.
     
  18. Faaborg

    Faaborg O. bimaculoides Registered

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    I read that the briareus has venom. Is thar right? Do the hummelincki or aculeatus have venom?
     
  19. fishkid6692

    fishkid6692 Vampyroteuthis Supporter

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    not that i'm aware of? where did you read this?
     
  20. Faaborg

    Faaborg O. bimaculoides Registered

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