^UY; EFFECTS OF DELAYED INITIAL FEEDING 



in mortality at sea could come about after yolk 

 absorption, or at any other time, owing to factors 

 other than the availability of food. Hjort was, 

 of course, not referring to larvae of the atherinid 

 type when he enunciated his "critical period" 

 hypothesis, but with the large volume of pub- 

 lished material now available concerning the lar- 

 vae of a few commercially important species, 

 it would be easy to lose sight of the great diver- 

 sity of larval forms and to apply ideas which 

 may have validity in some groups to groups 

 in which they have no place. 



ACKNOWLEDGMENTS 



I wish to express my sincere thanks to 

 Reuben Lasker, National Marine Fisheries Ser- 

 vice, La Jolla, Calif., for advice, encouragement, 

 and the generous provision of laboratory and 

 aquarium space during this study. Andrew 

 Kuljis and David Crear assisted in the collection 

 of grunion eggs, and Elaine Sandknop prepared 

 the cleared and stained larvae. The author was 

 supported by a Bureau of Commercial Fisheries 

 (now National Marine Fisheries Service) Pre- 

 doctoral Fellowship during this work. 



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