Journal of the Marine Biological Association of the UK

Research Article

Life history traits of the temperate mini-maximalist Idiosepius notoides, (Cephalopoda: Sepioidea)

Sean R.  Tracey a1c1 , Mike A.  Steer a2 and Gretta T.  Pecl a1
a1 Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Private Bag 49, Hobart, Tasmania, 7001, Australia
a2 School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Private Bag 370, Launceston, Tasmania, 7250, Australia

Article author query
tracey sr   [PubMed][Google Scholar] 
steer ma   [PubMed][Google Scholar] 
pecl gt   [PubMed][Google Scholar] 


Age, growth and maturation of the temperate ‘mini-maximalist’ Idiosepius notoides from Tasmania is described and compared with those of its tropical congener Idiosepius pygmaeus. Using statolith increment analysis, growth of I. notoides was best described by a power curve with a maximum age of 115 days recorded. Males have a shorter lifespan than females, however growth rates were similar between the sexes. Idiosepius notoides grows to a larger size than its tropical counterpart. Onset of maturity in I. notoides occurred at an age of approximately 68 days for males and 88 days for females compared to 45–60 days for I. pygmaeus. Size at onset of sexual maturity was analogous between the two species, with males mature at approximately 6·5 mm mantle length (ML) and females at 14·0 mm ML. Idiosepius notoides, like I. pygmaeus, is a small short-lived sepioid with significant gender dimorphism and the capacity to spawn multiple times throughout its short life. This research supports the concept of similar cephalopod species living longer and growing larger in cooler environments.

(Received December 12 2002)
(Accepted October 26 2003)

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