TABLE OF CONTENTS 



Page 



INTRODUCTION 1 



Problem 1 



Water Penetration 1 



The Eye and the Spectrum 3 



Infrared Radiation and Animals Other Than Fishes 3 



MATERIALS 4 



EXPERIMENTS ON THE REACTION OF FISH TO INFRARED RADIATION ... 4 



Avoidance 4 



Attraction 7 



Orientation 7 



Fright 11 



INFRARED RADIATION AS A TOOL 11 



Penetration in Water 11 



Animal Reaction 14 



Equipment 14 



Uses 14 



SUMMARY 15 



Acknowledgments 15 



LITERATURE CITED 15 



ILLUSTRATIONS 



Figure 1 . Radiation and water absorption 2 



Figure 2 . Schematic diagram of two types of infrared telescopes 5 



Figure 3 . Diagram of experimental facilities - •^ 



Figure 4. Distribution of fingerling Pacific salmon (O^. kisutch) 



under ordinary room lighting 9 



Figure 5. Distribution of fingerling Pacific salmon (O. kisutch) 



with infrared radiation 9 



Figure 6 . Trou^ used in flowing water experiments 10 



Figure 7. Close-up view of trough and fish as seen through 



infrared telescope 10 



Figure 8 . Fish and array in main guiding tank 13 



Figure 9 . Infrared penetration in water 13 



