118 



-ishery Bulletin 



1990 



This study emphasizes the need to critically compare 

 different methods of estimating growth in tropical 

 squids. It is essential to review size-frequency analysis 

 in the light of statolith age findings at a variety of dif- 

 ferent geographic localities in the range of a species. 

 Growth comparisons incorporating both size frequen- 

 cy and statolith ageing methods of other tropical Aus- 

 tralian squid species are currently being investigated. 



Artificial culture conditions provide a third method 

 to estimate squid growth. Based on laboratory culture 

 and field observations, Segawa (1987) has reached con- 

 clusions similar to the present study of a short life span 

 and rapid growth for S. lessoniana in temperate waters 

 around Japan. Segawa further provides growth data 

 from a captive female S. lessoniana spawning at 113 

 days and 143 mm in tropical waters in the Philippines. 

 This value fits well in the size-age correlation for female 

 squid in tropical Australia. 



Forsythe and Van Heukelem (1987) have suggested 

 that development and refinement of ageing techniques 

 are the most important tool needed in the study of 

 cephalopod growth in natural populations. While stato- 

 lith rings are a valuable tool, it is important to use a 

 variety of methods to assess growth on the same 

 population to distinguish between locality and method- 

 specific differences. 



Acknowledgments 



I would like to thank Prof. J.H. Choat for assistance 

 during the research and critical examination of the 

 manuscript, C.H. Jackson for assistance with collection 

 of field specimens, and the Australian Institute of 

 Marine Science for providing access to study sites on 

 Cape Ferguson. This research was supported by grants 

 through James Cook University of North Queensland. 



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