• Looking to buy a cephalopod? Check out Tomh's Cephs Forum, and this post in particular shares important info about our policies as it relates to responsible ceph-keeping.


Those octopuses labelled "joubini" are usually the dwarf "mercatoris". We have several people keeping mercatoris - search for mercatoris to find them all. Einey (Einstein), Animal Mother's octopus, was a mercatoris. Lev has a thread about his efforts at raising mercatoris babies.

I have kept quite a few O. mercatoris and reared several clutches. Frankly, as aquarium species, they are pretty dull. They remain tightly holed up during the day and only come out at night. They are shy and not interactive. And you will have an adult for only a few weeks. However, rearing the hatchlings is interesting and doable.

What is the difference between mercatoris and joubini, in addition to the size of the eggs?

The photo in the link below, if it is really joubini, suggests a bluish color similar to briareus, but previous photos I've seen don't show this at all.