Petromir,
LOL, if this is the third arm to the right (clockwise, orienting your eyes with the octopus eyes), you have a male octopus . Here is a link to a thread with photos of the hectocotylus in several species
Very good observation! Most new keepers look and can't find this sign. A closer look (easier on some octopuses than others) you will see a spermataphore channel running the length of the arm. I find that easier to see in photos than in a live animal .
I prefer getting males. A female will brood even infertile eggs and you lose association with the animal over the brood cycle. Males seem to live slightly longer in captivity and do not go through the sequestered time.
LOL, if this is the third arm to the right (clockwise, orienting your eyes with the octopus eyes), you have a male octopus . Here is a link to a thread with photos of the hectocotylus in several species
Very good observation! Most new keepers look and can't find this sign. A closer look (easier on some octopuses than others) you will see a spermataphore channel running the length of the arm. I find that easier to see in photos than in a live animal .
I prefer getting males. A female will brood even infertile eggs and you lose association with the animal over the brood cycle. Males seem to live slightly longer in captivity and do not go through the sequestered time.