CONTENTS 



INTRODUCTION... page 1 

 Background. . . 1 

 Purpose. . . 3 



EQUIPMENT. . . 4 



NEL tower. . . 4 

 Hydrophotometer. . .5 

 Temperature sensor. . . 6 

 Underwater pump. . . 6 



METHODS. . . 7 



Macroplankton. . . 7 

 Microplankton. . . 10 



DATA REDUCTION AND PRESENTATION. . . 14 

 Macroorganisms. . . 17 

 Microconstituents. . . 19 

 Mathematical treatment. . . 19 



RESULTS. . . 36 





Operation I. . 



. 36 



Operation II. 



. . 40 



Red water , . . 



52 



DISCUSSION... 5 7 



Microconstituents. . . 57 



Macroplankton. . . 60 



Red water ...61 



Thermal- structure cycles. . . 63 



SUMMARY AND CONCLUSIONS. . . 65 



RECOMMENDATIONS... ^7 



REFERENCES. . . 69 



APPENDIX: TIME -DEPTH CHARTS. . . Al 



