Octopus tetricus, the gloomy octopus, the common Sydney octopus,[3] or the peachy octopus,[4] is a species of octopus from the subtropical waters of eastern Australia and northern New Zealand.[2]O.tetricus belongs to the Octopus vulgaris species group. All species within the O. vulgaris group are similar in morphology,[5] behaviour, and physiology.[6] The English translation of O. tetricus (Latin) is 'the gloomy octopus'.[7] It is a significant species in the fishing industry in Australia. They play an important role in energy flux between trophic levels in the marine environment.[8]