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ACKNOWLEDGEMENTS Special appreciation is extended to Mr. F. W. (Bob) Jackson, District Fisheries Biologist, who contributed much to the success of this investigation. Mr. Fred Eisertnan, Fisheries Management Coordinator, also contributed measurably to the project, as did Mr. Dick Baldes, Project Assistant in 1963 and 1964, and the members of Fish Management Crew Number 4. Mr. Cliff Bosley aided the study by making available his unpublished fish length data from earlier studies of the lower river. The author is indebted to the in- numerable ot'$er personnel of the Wyoming Game and Fish Department who helped at various times. Thanks are due to the various U.S. Fish and Wildlife Service personnel who assisted in gathering data during the treatment. Gratitude is expressed to Mr. E. L. Heinschel of the FMC Corporation for providing access to the company water chemistry records. Dr. Charles E. Warren, Oregon State University, provided guidance in the irritial organization of the study and offered helpful criticism in its later stages. Dr. Carl E. Bond, Dr. Donald W. Chapman, and others of the faculty of Oregon State University also made helpful suggestions. Appreciation is extended to Mr. George Chadwick of the Pacific Coopera- tive Water Pollution and Fisheries Research Laboratories, Oregon State Uni- versity, and the Oregon Game Commission for assistance in developing the field bioassay method. Special consideration and thanks is extended to the many landowners along the river, who, without exception permitted the project personnel to trespass on .their lands during the study. I am indebted to Dr. George Baxter, University of Wyoming, for the time he spent in confirming the invertebrate identifications. Thanks are also due to Mr. L. D. Becker, U.S. Geological Survey, for pro- viding in advance 1964 water-flow records for the Green and New Fork Rivers. Appreciation is extended to Mrs. F. W. Jackson and Mrs.. Niles T. Binns for donating their talents as seamstresses in the construction and maintenance of the drift net. "l'kris investigatiuu was financed through Uingel-Johnson Federal Aid to I~•ish Resturaliun funds administered by the Wyoming Game and Fish Depart- ment under projects: D. J. F-25-R-2 and D. J. F-25-R-4.