CONTENTS 



Page 



Introduction 1 



Methods 2 



The study area 2 



Egg and larval abundance 2 



Stream discharge and temperature 3 



Water quality 4 



Observations of eggs and larvae 4 



Changes in abundance of the 1961 brood year 4 



Total population 4 



Dead eggs and larvae 6 



Composition of the population of dead eggs and larvae 7 



Observations on environmental factors 8 



Stream temperature 8 



Stream discharge 8 



Water quality 9 



Discussion and conclusions 10 



Summary 11 



Literature cited 12 



ill 



