Octopus Māori Biology

Māori Octopus Biology

HabitatRocky reefs, beds of seagrass or seaweeds, sand down to 549 m.Norman (2000);
Edgar (2008)
DistributionTemperate and sub-Antarctic waters of New Zealand and southern Australia.Stranks (1996)
DietCrustaceans (crabs, lobsters), fish, shellfish (abalone, mussels) and other octopuses.Norman (2000)
Movement and Stock Structure
Several genetically distinct populations.
At least two populations in Tasmania: north-east Tasmanian population and south-west Tasmanian populations (which extends to South Australia).
Adults of the species aggregate all year-round in Eaglehawk Bay on the Tasman Peninsula.
Doubleday et al. (2009)
Natural MortalityUndefined.
Maximum AgeMaximum of 7.3 months from ageing study but lifespan potentially up to 3 years.Doubleday et al. (2011); Grubert and Wadley (2000)
GrowthMax weight: 15 kg.
Growth equation undefined.
Stranks (1996)
MaturitySize-at-50% maturity undefined.
Female mature between 0.6 to 1 kg.
Weight-specific fecundity range from 6.82 to 27.70 eggs/gram body.
Mating activity is independent of female maturity.
Grubert and Wadley (2000)
Reproductive biologySemelparous (i.e. reproduces only once before dying).
Spawning season: spring-summer in New Zealand but appear to mate and lay all year round in Tasmania.

Moderate fecundity (5000 – 7000 eggs); egg length 6.5 – 7.5mm.
Benthic eggs with active brooding by females.
Planktonic hatchlings ~5 mm length.
Anderson (1999)