THEILACKER: EFFECT OF STARVATION ON JACK MACKEREL 



larvae. Evidence of morphological differences be- 

 tween laboratory-reared and sea-caught larvae 

 indicates that it may be difficult to transfer 

 laboratory results to the sea. Blaxter ( 1968, 1971), 

 for example, found laboratory-reared herring lar- 

 vae exhibited a greater size variation and a higher 

 condition factor than sea-caught larvae. Balbon- 

 tin et al. ( 1973) reported differences in body depth, 

 head depth, and head length between laboratory 

 and wild herringjuveniles of the same length. The 

 laboratory-reared animals had a deeper body and 

 a deeper or longer head. 



The usefulness of the morphometric discrimi- 

 nant technique will depend upon the consistency 

 of changes in morphological pattern in individuals 

 when feeding and starving. However, even if the 

 changes are not constant, useful indicators of lar- 

 val survival will not require the exact allocation of 

 all individuals into feeding and starving groups 

 but rather only reasonable estimates of the rela- 

 tive proportions will be needed. My results indi- 

 cate that a multivariate statistical approach, 

 combining several morphometric measurements 

 in a SWDA, may provide this information. Species 

 that do not yield to a morphological analysis 

 should yield to the histological approach. 



ACKNOWLEDGMENTS 



I wish to thank James Zweifel for his consulta- 

 tion and valuable suggestions, John Hunter, 

 Reuben Lasker, Edward Houde, and Karl Ehrlich 

 for critically reviewing the manuscript, and Jack 

 Metoyer for his capable assistance. 



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