6o Thermal and Diurnal Changes in the Vertical Distribution of Eggs and Larvael/ 



By 

 Ralph Po Silliman 



CONTFINTS 

 Preface Page 



Intr OQUO tjXOn© oooooooooooo«oooooeooooooooo XOt« 

 MeTJilOdS oooeoooooooooooooooooooooeooooo 



Periods and area coveredo oooooooooooooooooooooo 

 Clas s it i ca ti on' oi inaterxai.o oooooooooooooooo»oooo 



Standardization of hauls o ooaoooeoaoooaoooaoeoco 



hiiiect Ox 'Ceinpera uure oeoooooooooooooooooeoooo 



Diurnal changes oooooooooo 



Summary and conclusions aooo«o«oo> 



Xji teraijUre citjecia ooooooooooooooeooooooooooo 



Appendix A - Tables of detailed towing data 



182 

 182 



ooooooooooooeeooo 



oooeoeooooooo 



OOOOOOOOOODO 



185 

 188 



200 

 189 



Appendix B - Lists showing time and location of hauls, 



depths fishedf and numbers of eggs and larvae taken, o « o e o o 



198 



l/ This reports without appendix A, was originally published in Sears 

 Foundations Journal of Marine Researchj, Volo Vj, NOo. 2, under the title, 

 "Thermal and Diurnal IShangeB in the Vertical Distribution of Eggs and Larva© 

 of the Pilchard ( Sardinops caerulea )." It is reproduced by permission of 

 the editors of that publication« 



The original data used were collected as part of a joint program of 

 oceanographic research carried on by the United States Fish and Wildlife 

 Service and the Soripps Institute of Oceanographyo Mro 0<> Eo Sette, then 

 in charge of the South Pacific Investigation of the Fish and Wildlife Service 

 suggested the investigation of the particular problems discussed in this 

 report^ and gave much helpful advioe© Sorting of the plankton oolleotions 

 was accomplished with the assistance of Works Progress Administration 

 projects Noso 10917 and 65-2-08-286o 



181 



