£o Determination of the Age of Juveniles by Scales and Otoliths 



i7 



Lionel Ao ?falford and Kenneth Ho Mosher 



CONTENTS 

 Preface Page 



The Pr'OOXelU oooooooooooo«eoe9«ooooe 32» 



Collection of Material ..oooo.o.o.oo.oo 34 



Age and Growth of Juvenile Pilchards as Judged from 



Length Frequency Curves » ooooo.o.o.o.oo 35 



Age and Growth of Juvenile Pilchards as Judged from 



Scales and Otoliths. ao<i<>>a«»oo«<>o<>o<> 38 



The Use of Scales for Determining Ageo . . » » o o « 38 



The Use of Otoliths for Determining Ageo . ., « o o <> 45 



Growth of Juvenile Pilchards ..0000,00000 46 



Difference in Size Between Localities. . » « o o o o 48 



Discussion and Conclusion .„ ,oooc.o48 



?„/ Now Chief J, Branch of Fishery Biology, Fish and Wildlife Service;, 

 Washingtonj, D, C» 



'/ Now Fishery Research Biologist, Alaska Fishery Investigations^ 

 "° Seattle,, Washington 



