4o Influence of Temperature on the Rate of Development of Pilchard 



Eggs in Nature. 



By 



Elbert H. Ahlstromi/ 

 CONTENTS 



Preface Page 



Introduction ©o»o»oeoo»o»»<>ooo««ooo« 133 



Collection of material ...o .....o.o 133 



Description of the pilchard egg. «... 134 



Time of s pawning .....o....... ..« 135 



Duration of developmento oco...s«a..e.o<>.. 138 



Water temperatures o.o««....«>«e.o.oo..o 138 



Influence of temperature on the rate of 



development of pilchard eggs. ....oo...... 139 



Summary .« oooooo.oo.oeooooooooo.. l4o 



Appendix. «ooooa.o«oa«o..o.o.a..*a 14o 



stages of pilchard eggs 

 Tables 



Bibliography ooo.oo«o.««...o.o....e 167 



l/ Fishery Research Biologist, South Paolfio Fishery Investigations, 

 Fish and midlife Service, La Jolla, California. 



132 



