CONTENTS 



Page 



Introduction 1 



Materials and methods 2 



Elokomin River 2 



Herman Creek 2 



Laboratory procedure 3 



Species and habitat in the lower Elokomin River 3 



Predation on chinook salmon fry 5 



By sculpin 5 



Variation between species 5 



Estimation of loss of salmon 9 



Prey-dependent factors 10 



By salmon and trout 11 



Influence of hatchery techniques on salmon loss 11 



Factors related to methods of fish culture 11 



Factors related to release techniques 12 



Summary 13 



Acknowledgments 13 



Literature cited 13 



m 



