Polar Biology

, Volume 16, Issue 3, pp 227–230 | Cite as

Beak length analysis of arrow squidNototodarus sloanii (Cephalopoda: Ommastrephidae) in southern New Zealand waters

  • George D. Jackson
  • Jean F. McKinnon
Short Note


Beak length analysis was undertaken for the arrov, squidNototodarus sloanii in the New Zealand sector of the Southern Ocean between Stewart Island and the Auckland Islands.N. sloanii has a restricted range and is endemic to the waters around New Zealand and its associated southern islands, where it supports a fishery and is preyed upon by a number of fishes, marine mammals and birds. Lower rostral length (LRL) and upper rostral length (URL) were analysed to see how these beak measurements related to both mantle length (ML) and wet weight (W). Both lower and upper rostral lengths could be used as useful predictors of ML and W inN. sloanii, as relationships had limited scatter and high correlation coefficients. The relationships between LRL and ML, and URL and ML were only linear after regressing log-transformed values of beak length against ML. However, the relationships between LRL and W, and URL and W were linear without transforming either thex ory values. These results are different from previously published beak length analyses ofNototodarus in New Zealand waters.


Southern Ocean Marine Mammal Restricted Range Mantle Length Length Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • George D. Jackson
    • 1
  • Jean F. McKinnon
    • 1
  1. 1.Department of Marine ScienceUniversity of OtagoDunedinNew Zealand

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