Wolfi Octopus

Discussion in 'Octopus Care' started by njfish77, Mar 20, 2006.

  1. njfish77

    njfish77 Cuttlefish Registered

    Joined:
    Feb 26, 2006
    Messages:
    21
    Likes Received:
    0
    Well i figured out i have a wolfi octopus. Anyone have one or have any inof, experiance with them?? Anything would be great
     
  2. mucktopus

    mucktopus Haliphron Atlanticus Staff Member Moderator

    Joined:
    Dec 31, 2003
    Messages:
    523
    Likes Received:
    51
    They're nocturnal and spend a lot of time sitting on the side of the tank. I like them but admit they're not the most charismatic octopus.
     
  3. Nancy

    Nancy Titanites Staff Member Moderator

    Joined:
    Nov 20, 2002
    Messages:
    5,584
    Likes Received:
    71
    Location:
    Dallas Texas
    So Crissy, what is your favorite dwarf octopus? Could you tell us something of their various personalities?

    Some people say they're boring - I suspect not.

    Nancy
     
  4. mucktopus

    mucktopus Haliphron Atlanticus Staff Member Moderator

    Joined:
    Dec 31, 2003
    Messages:
    523
    Likes Received:
    51
    Roy is a much better person to ask that question. He spends much more time watching them in tanks than I do and he's been keeping them for ages. Almost all of my experience keeping pygmies in tanks has involved helping him with animals in his lab- generally trying herd the animals around to help him get some of those great photos. Other than that I've kept a few temporarily in the field. I like one from Moorea but it does not travel well or seem to do well in closed seawater systems. In general I like all octopuses for differrent reasons so I don't have a favorite. When thinking of species for the aquarium I think as much about collection techniques (i.e. the possibility that Indo-Pacific pygmies could be caught with cyanide) as I do about personalities. Roy really likes O. wolfi and I agree they're an interesting looking animal. Plus we have a lot to learn about them so they're exciting in that respect, but that doesn't necessarily make them a good pet.

    I'd like to see someone breed O. digueti. We had one in lab and it was pretty exciting. They're one of the few octopuses that court during mating (Janet Voight's work in aquaria), and they lay large eggs. Cool behavior, cool-looking animal, small- and it can be cultured!
     
  5. Nancy

    Nancy Titanites Staff Member Moderator

    Joined:
    Nov 20, 2002
    Messages:
    5,584
    Likes Received:
    71
    Location:
    Dallas Texas
    Thanks, maybe Roy will see this post.

    I think Greg (cthulhu77) is planning to breed O. digueti - hope so, anyway.

    Nancy
     
  6. njfish77

    njfish77 Cuttlefish Registered

    Joined:
    Feb 26, 2006
    Messages:
    21
    Likes Received:
    0
    Well yea he pretty much fits the description of him. Im getting a red moonlight thow so i will be able to enjoy him a little more.
     
  7. njfish77

    njfish77 Cuttlefish Registered

    Joined:
    Feb 26, 2006
    Messages:
    21
    Likes Received:
    0
    I think he can see red light thow. Is it true that all octo species cant see red?
     
  8. monty

    monty Colossal Squid Staff Member Supporter

    Joined:
    Mar 8, 2004
    Messages:
    4,887
    Likes Received:
    11
    I don't know that all octo species have been studied, but in general that's the belief.

    However, not all red light is monochromatically red-- a lot of the time, even if it looks red to us, it includes other colors as well. Usually LED red light is truely just red, but any sort of incandescent or flourescent light will have other colors, and if it's filtered with a red filter, that will probably let through some light that the octo can see, even though it seems insignificant to human eyes because there's so much more red. In particular if it's got some yellow/orange, it could be in the octo's range, and if it's at all pink, the white part of the light will go well into the octo's visual range.

    This is starting to be a very frequently asked question, so I just spent a few hours looking up papers... I think I'll write up a mini-article on this. Unfortunately, though, I haven't found a reference yet that describes the width of the spectral response for cephalopod rhodopsins, just the peak positions.

    My first cut analysis is here :rainbow: :

    from http://cephbase.utmb.edu/refdb/pdf/7329.pdf

    Alloteuthis subulata 499nm
    Loligo forbesi 494nm
    Sepia Officinalis 492nm
    Todarodes Pacificus 482nm
    Paroctopus Defleini 480nm

    from http://en.wikipedia.org/wiki/Rhodopsin

    (see the graph of the 3 color curves and dashed rod curve)

    human visual pigments:
    red cone peak=564nm tail=680nm
    green cone peak=534nm tail=650nm
    blue cone peak=420nm tail=530nm
    rod peak=498nm tail=600nm

    so, assuming the octopus rhodopsin is about the same shape as human
    rod rhodopsin but its peak is shifted to 480nm, the octopus' red end
    perception will fall off at about 580nm.

    As can be seen in this image ( from
    http://en.wikipedia.org/wiki/Electromagnetic_spectrum )

    [​IMG]

    this is sort of yellow to yellow-orange.

    This means that an octopus can't see light frequency that's "redder"
    than yellow-orange, but can see blues and greens just fine, probably
    better than humans.

    Note that although firefly squids are known to have 3 visual pigments,
    and therefore color vision more like humans than the monochromatic
    vision of most cephs, all three pigments are still in the blue-green
    range: 470nm, 484nm, and 500nm. (Note, though, that the 484nm pigment
    and the other two are located in different areas of the retina,
    however) See http://www.springerlink.com/link.asp?id=p21210724627v321

    most cephs can also see polarization of light, which humans
    cannot. Some may also be able to see a bit into the UV range.
     
  9. Tintenfisch

    Tintenfisch Architeuthis Staff Member Moderator

    Joined:
    Nov 19, 2002
    Messages:
    2,083
    Likes Received:
    171
    Have you got this ref?

    Young J.Z. 1960. Eyes, colours, and shapes. Proceedings of the Royal Institute of Great Britain. 38 (173): 401-413.
     
  10. monty

    monty Colossal Squid Staff Member Supporter

    Joined:
    Mar 8, 2004
    Messages:
    4,887
    Likes Received:
    11
    Nope, but I was figuring on going to the library and xeroxing all the pre-internet stuff like that... thanks.

    I actually just ordered the (very expensive) JZ Young and Marion Nixon's "The Brains and Lives of Cephalopods" and the Hanlon/Messenger "Cephalopod Behavior" books, since I just got paid so I'm giving myself a treat...:read:
     

Share This Page